SimulationCore2/Equipments/MudSystem/Pump_and_Trip_In.f90

subroutine Pump_and_TripIn    !  is called in subroutine CirculationCodeSelect
    
        Use GeoElements_FluidModule
        USE CMudPropertiesVariables
        USE MudSystemVARIABLES
        USE Pumps_VARIABLES
        !USE CHOKEVARIABLES
        !USE CDataDisplayConsoleVariables ,  StandPipePressureDataDisplay=>StandPipePressure
        !use CManifolds
        use CDrillWatchVariables
        !use CHOKEVARIABLES
        !use CChokeManifoldVariables
        !use CTanksVariables, TripTankVolume2 => DrillingWatch%TripTankVolume, TripTankDensity2 => TripTankDensity
        USE sROP_Other_Variables
        USE sROP_Variables
        use KickVARIABLESModule
        Use CShoeVariables
        use CError

   
   implicit none
   
integer i,ii,AddLocation
!===========================================================WELL============================================================
!===========================================================WELL============================================================ 

        MudSystem%StringFlowRate= MUD(2)%Q
        MudSystem%AnnulusFlowRate= MUD(2)%Q

        
            !write(*,*) 'Trip In'
  

!========================Horizontal PIPE ENTRANCE================= 
        
         if (ABS(MudSystem%SuctionDensity_Old - MudSystem%Suction_Density_MudSystem) >= MudSystem%DensityMixTol) then     ! new mud is pumped
             
            call MudSystem%Hz_Density%AddToFirst (MudSystem%Suction_Density_MudSystem)
            call MudSystem%Hz_MudDischarged_Volume%AddToFirst (0.0d0)
            call MudSystem%Hz_Mud_Forehead_X%AddToFirst (MudSystem%Xstart_PipeSection(1))
            call MudSystem%Hz_Mud_Forehead_section%AddToFirst (1)
            call MudSystem%Hz_Mud_Backhead_X%AddToFirst (MudSystem%Xstart_PipeSection(1))
            call MudSystem%Hz_Mud_Backhead_section%AddToFirst (1)
            call MudSystem%Hz_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
            call MudSystem%Hz_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
            call MudSystem%Hz_MudOrKick%AddToFirst (0)  
             
             MudSystem%SuctionDensity_Old= MudSystem%Suction_Density_MudSystem
         endif

!========================Horizontal PIPE STRING================= 
         
                MudSystem%Hz_MudDischarged_Volume%Array(1)= MudSystem%Hz_MudDischarged_Volume%Array(1)+ ((MudSystem%StringFlowRate/60.0d0)*MudSystem%DeltaT_Mudline)    !(gal)
                
                MudSystem%total_add = MudSystem%total_add + ((MudSystem%StringFlowRate/60.0d0)*MudSystem%DeltaT_Mudline)
                
                    if (ChokeControlPanel%ChokePanelStrokeResetSwitch == 1) then
                        MudSystem%total_add= 0.
                    endif                   
                
                
        !write(*,*) ' total decrease(add to HZ)=' , total_add
                !write(*,*) ' add to HZ=' , ((MudSystem%StringFlowRate/60.0d0)*DeltaT_Mudline)                

imud=0       
    do while (imud < MudSystem%Hz_Mud_Forehead_X%Length())
        imud = imud + 1 
        
            if (imud> 1) then
                MudSystem%Hz_Mud_Backhead_X%Array(imud)= MudSystem%Hz_Mud_Forehead_X%Array(imud-1)
                MudSystem%Hz_Mud_Backhead_section%Array(imud)= MudSystem%Hz_Mud_Forehead_section%Array(imud-1)
            endif

                
            MudSystem%DirectionCoef= (MudSystem%Xend_PipeSection(MudSystem%Hz_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%Hz_Mud_Backhead_section%Array(imud))) &
                / ABS(MudSystem%Xend_PipeSection(MudSystem%Hz_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%Hz_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystem%Hz_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Xend_PipeSection(MudSystem%Hz_Mud_Backhead_section%Array(imud))- MudSystem%Hz_Mud_Backhead_X%Array(imud))* &
                MudSystem%Area_PipeSectionFt(MudSystem%Hz_Mud_Backhead_section%Array(imud)) !(ft^3)          
            MudSystem%Hz_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%Hz_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal
            

            if ( MudSystem%Hz_MudDischarged_Volume%Array(imud) <= MudSystem%Hz_EmptyVolume_inBackheadLocation%Array(imud)) then
                MudSystem%Hz_Mud_Forehead_section%Array(imud)= MudSystem%Hz_Mud_Backhead_section%Array(imud)
                MudSystem%Hz_Mud_Forehead_X%Array(imud)= MudSystem%Hz_Mud_Backhead_X%Array(imud)+ MudSystem%DirectionCoef*(MudSystem%Hz_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_PipeSectionFt(MudSystem%Hz_Mud_Backhead_section%Array(imud))
                
            else
                
                
                MudSystem%isection= MudSystem%Hz_Mud_Backhead_section%Array(imud)+1
                MudSystem%Hz_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Hz_MudDischarged_Volume%Array(imud)- MudSystem%Hz_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (MudSystem%isection > 1) then        ! (horizontal pipe exit)
                            MudSystem%Hz_MudDischarged_Volume%Array(imud)= MudSystem%Hz_MudDischarged_Volume%Array(imud)- MudSystem%Hz_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%Hz_Mud_Forehead_X%Array(imud)= MudSystem%Xend_PipeSection(1)
                            MudSystem%Hz_Mud_Forehead_section%Array(imud)= 1
                            
                            if (MudSystem%Hz_MudDischarged_Volume%Array(imud)<= 0.0d0)  then    ! imud is completely exited form the string
                                call RemoveHzMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystem%xx= MudSystem%Hz_RemainedVolume_in_LastSection%Array(imud)/ MudSystem%PipeSection_VolumeCapacity(MudSystem%isection)   !(gal)
                        
                    if (MudSystem%xx<= 1.0) then
                        MudSystem%Hz_Mud_Forehead_section%Array(imud)= MudSystem%isection
                        MudSystem%Hz_Mud_Forehead_X%Array(imud)= (MudSystem%xx * (MudSystem%Xend_PipeSection(MudSystem%isection)- MudSystem%Xstart_PipeSection(MudSystem%isection)))+ MudSystem%Xstart_PipeSection(MudSystem%isection)
                        exit
                    else
                        MudSystem%Hz_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Hz_RemainedVolume_in_LastSection%Array(imud)- MudSystem%PipeSection_VolumeCapacity(MudSystem%isection)
                        MudSystem%isection= MudSystem%isection+ 1
                                                      
                    endif

                enddo
            
            endif   
        
    enddo
!========================Horizontal PIPE END=================         
            
        
!========================Utube1 Air Element Removing=================         
    
        !if (UtubeMode1Activated== .true.) then      ! StringUpdate == .true.
        !
        !
        !    !StringDensity_Old=MudSystem%St_Density%Array(2)
        !    
        !    write(*,*) 'StringDensity_Old=' , StringDensity_Old
        !    
        !    UtubeMode1Activated= .false.
        !endif
        
!========================Utube1 Air Element Removing End=================       
       
!!========================Utube2 Removing from Annulus=================     not needed 97.04.26    
!    
!        if (UtubeMode2Activated== .true.) then      ! StringUpdate == .true.
!            
!            if (Ann_MudOrKick%Last() == 104) then        !movaghati. albate age merge anjam shode bashe moshkeli nist
!                call RemoveAnnulusMudArrays(Ann_MudOrKick%Length())
!            endif
!            
!            UtubeMode2Activated= .false.
!        endif
!        
!
!!========================Utube2 Removing from Annulus End=================  
        
!========================New Pipe Filling=================         
    
        !if (F_StringIntervalCounts > F_StringIntervalCountsOld) then      ! StringUpdate == .true.
        if (MudSystem%AddedElementsToString > 0) then      ! StringUpdate == .true.
            
            !NoPipeAdded= F_Counts%StringIntervalCounts - F_StringIntervalCountsOld

            
            MudSystem%NewPipeFilling=0
            
            IF (MudSystem%St_MudOrKick%First() == 104) then
                MudSystem%St_MudDischarged_Volume%Array(1) = MudSystem%St_MudDischarged_Volume%Array(1) + sum(MudSystem%PipeSection_VolumeCapacity(2:1+MudSystem%AddedElementsToString))   ! new pipe is filled by air
            else
                call MudSystem%St_Density%AddToFirst (0.d0)
                call MudSystem%St_MudDischarged_Volume%AddToFirst (sum(MudSystem%PipeSection_VolumeCapacity(2:1+MudSystem%AddedElementsToString)))
                call MudSystem%St_Mud_Forehead_X%AddToFirst (MudSystem%Xstart_PipeSection(2))
                call MudSystem%St_Mud_Forehead_section%AddToFirst (2)
                call MudSystem%St_Mud_Backhead_X%AddToFirst (MudSystem%Xstart_PipeSection(2))
                call MudSystem%St_Mud_Backhead_section%AddToFirst (2)
                call MudSystem%St_RemainedVolume_in_LastSection%AddToFirst (0.d0)
                call MudSystem%St_EmptyVolume_inBackheadLocation%AddToFirst (0.d0)
                call MudSystem%St_MudOrKick%AddToFirst (104)
            endif

        endif
        
        !F_StringIntervalCountsOld= F_StringIntervalCounts
    
        
            
          if (MudSystem%NewPipeFilling == 0) then  ! 2= is the first element of string (1= is for Hz pipe)
              
                
                MudSystem%LackageMudVolume= MudSystem%St_MudDischarged_Volume%Array(1)      ! = Air element
                
                
              write(*,*) 'LackageMudVolume=' , MudSystem%LackageMudVolume

           
            
                 if (ABS(MudSystem%St_Density%Array(2) - MudSystem%Hz_Density%Last()) >= MudSystem%DensityMixTol) then     ! new mud is pumped
                    call MudSystem%St_Density%AddTo (2,MudSystem%Hz_Density%Last())
                    call MudSystem%St_MudDischarged_Volume%AddTo (2, 0.d0)
                    call MudSystem%St_Mud_Forehead_X%AddTo (2,MudSystem%Xstart_PipeSection(2))
                    call MudSystem%St_Mud_Forehead_section%AddTo (2 , 2)
                    call MudSystem%St_Mud_Backhead_X%AddTo (2,MudSystem%Xstart_PipeSection(2))
                    call MudSystem%St_Mud_Backhead_section%AddTo (2 ,2)
                    call MudSystem%St_RemainedVolume_in_LastSection%AddTo (2,0.d0)
                    call MudSystem%St_EmptyVolume_inBackheadLocation%AddTo (2,0.d0)
                    call MudSystem%St_MudOrKick%AddTo (2,0)
             
                     !StringDensity_Old= Hz_Density%Last()
                 endif 
                

                MudSystem%St_MudDischarged_Volume%Array(2)= MudSystem%St_MudDischarged_Volume%Array(2)+ min( ((MudSystem%StringFlowRate/60.0d0)*MudSystem%DeltaT_Mudline), MudSystem%LackageMudVolume)  !(gal) 
                
                MudSystem%St_MudDischarged_Volume%Array(1)= MudSystem%St_MudDischarged_Volume%Array(1)- min( ((MudSystem%StringFlowRate/60.0d0)*MudSystem%DeltaT_Mudline), MudSystem%LackageMudVolume)  ! air(gal) 
    
                !LackageMudVolumeAfterFilling= sum(PipeSection_VolumeCapacity(2:F_StringIntervalCounts)) - sum(St_MudDischarged_Volume%Array(:))
                
                MudSystem%LackageMudVolumeAfterFilling= MudSystem%St_MudDischarged_Volume%Array(1)      ! last time it should be zero
                
                
                
                if (MudSystem%LackageMudVolumeAfterFilling == 0.) then
                    MudSystem%NewPipeFilling= 1
                    call RemoveStringMudArrays(1)
                    MudSystem%St_Mud_Backhead_X%Array(1) = MudSystem%Xstart_PipeSection(2)
                    MudSystem%St_Mud_Backhead_section%Array(1) = 2
                endif
                
          endif

!========================New Pipe Filling End=================       
        
        
        
        
        if (MudSystem%NewPipeFilling == 0) then
            MudSystem%StringFlowRate= 0.
            MudSystem%AnnulusFlowRate= 0.
        endif  
        
        MudSystem%StringFlowRateFinal= MudSystem%StringFlowRate
        MudSystem%AnnulusFlowRateFinal= MudSystem%AnnulusFlowRate
        

        
          
!========================STRING ENTRANCE================= 
        
         if (MudSystem%StringFlowRateFinal > 0.0 .and. ABS(MudSystem%St_Density%First() - MudSystem%Hz_Density%Last()) >= MudSystem%DensityMixTol) then     ! new mud is pumped
            call MudSystem%St_Density%AddToFirst (MudSystem%Hz_Density%Last())
            call MudSystem%St_MudDischarged_Volume%AddToFirst (0.0d0)
            call MudSystem%St_Mud_Forehead_X%AddToFirst (MudSystem%Xstart_PipeSection(2))
            call MudSystem%St_Mud_Forehead_section%AddToFirst (2)
            call MudSystem%St_Mud_Backhead_X%AddToFirst (MudSystem%Xstart_PipeSection(2))
            call MudSystem%St_Mud_Backhead_section%AddToFirst (2)
            call MudSystem%St_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
            call MudSystem%St_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
            call MudSystem%St_MudOrKick%AddToFirst (0)
             
             !StringDensity_Old= Hz_Density%Last()
         endif
         
         
                MudSystem%St_MudDischarged_Volume%Array(1)= MudSystem%St_MudDischarged_Volume%Array(1)+ ((MudSystem%StringFlowRate/60.0d0)*MudSystem%DeltaT_Mudline)    !(gal)
           
!=============== save String Mud data=========== 
                
             
        
                
    MudSystem%StMudVolumeSum= 0.d0
    !St_MudSaved_Density= 0.d0
    MudSystem%St_Saved_MudDischarged_Volume= 0.d0
    !Saved_St_MudOrKick= 0
    !Ann_to_Choke_2mud= .false.

    do imud=1, MudSystem%St_MudDischarged_Volume%Length()
        
            MudSystem%StMudVolumeSum = MudSystem%StMudVolumeSum + MudSystem%St_MudDischarged_Volume%Array(imud)
        
        if ( MudSystem%StMudVolumeSum > sum(MudSystem%PipeSection_VolumeCapacity(2:F_Counts%StringIntervalCounts)) ) then
            
            !IF (St_MudOrKick%Array(imud) == 0) THEN
                MudSystem%St_MudSaved_Density =MudSystem%St_Density%Array(imud)
                MudSystem%St_Saved_MudDischarged_Volume = MudSystem%StMudVolumeSum - sum(MudSystem%PipeSection_VolumeCapacity(2:F_Counts%StringIntervalCounts))
            !ELSEIF (St_MudOrKick%Array(imud) > 0 .AND. St_MudOrKick%Array(imud) <100) THEN        ! 104= AIR
            !    St_Kick_Saved_Volume = StMudVolumeSum - sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
            !    Saved_St_MudOrKick= St_MudOrKick%Array (imud)
            !    St_KickSaved_Density=MudSystem%St_Density%Array(imud)
            !END IF
            
            do ii= imud + 1, MudSystem%St_MudDischarged_Volume%Length()
                !IF (St_MudOrKick%Array(ii) == 0) THEN
                    MudSystem%St_MudSaved_Density = ((MudSystem%St_MudSaved_Density * MudSystem%St_Saved_MudDischarged_Volume) + (MudSystem%St_Density%Array(ii) * MudSystem%St_MudDischarged_Volume%Array(ii))) / (MudSystem%St_Saved_MudDischarged_Volume + MudSystem%St_MudDischarged_Volume%Array(ii))
                    MudSystem%St_Saved_MudDischarged_Volume = MudSystem%St_Saved_MudDischarged_Volume + MudSystem%St_MudDischarged_Volume%Array(ii)

                !ELSEIF (St_MudOrKick%Array(imud) > 0 .AND. St_MudOrKick%Array(imud) <100) THEN        ! 104= AIR
                !    St_Kick_Saved_Volume = St_Kick_Saved_Volume + St_MudDischarged_Volume%Array(ii)
                !    Saved_St_MudOrKick= St_MudOrKick%Array (ii)
                !    St_KickSaved_Density=MudSystem%St_Density%Array(ii)
                !END IF
            enddo
            
            
            !WRITE (*,*) 'St_Saved_Mud_Volume, St_Kick_Saved_Volume', St_Saved_MudDischarged_Volume, St_Kick_Saved_Volume
            exit ! exits do
            
        endif
        
    enddo
MudSystem%St_Saved_MudDischarged_Volume_Final = MudSystem%St_Saved_MudDischarged_Volume

IF (MudSystem%WellHeadIsOpen)     MudSystem%MudVolume_InjectedToBH = MudSystem%St_Saved_MudDischarged_Volume_Final
!======================================================================                
                
!========================STRING================= 
                      
imud=0  
    do while (imud < MudSystem%St_Mud_Forehead_X%Length())
        imud = imud + 1        
        
            if (imud> 1) then
                MudSystem%St_Mud_Backhead_X%Array(imud)= MudSystem%St_Mud_Forehead_X%Array(imud-1)
                MudSystem%St_Mud_Backhead_section%Array(imud)= MudSystem%St_Mud_Forehead_section%Array(imud-1)
            endif        
                     
            MudSystem%DirectionCoef= (MudSystem%Xend_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))) &
                / ABS(MudSystem%Xend_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Xend_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))- MudSystem%St_Mud_Backhead_X%Array(imud))* &
                MudSystem%Area_PipeSectionFt(MudSystem%St_Mud_Backhead_section%Array(imud)) !(ft^3)          
            MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0       ! ft^3  to gal
            
            
            !write(*,*) 'St_Mud_Backhead_section%Array(1)=' , St_Mud_Backhead_section%Array(1)
            !write(*,*) 'Xend_PipeSection(St_Mud_Backhead_section%Array(1))=' , Xend_PipeSection(St_Mud_Backhead_section%Array(1))
            !
            !write(*,*) 'St_EmptyVolume_inBackheadLocation%Array(1)=' , St_EmptyVolume_inBackheadLocation%Array(1)
            !write(*,*) 'St_Mud_Backhead_X%Array(1)=' , St_Mud_Backhead_X%Array(1)
            
            
            if ( MudSystem%St_MudDischarged_Volume%Array(imud) <= MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)) then
                MudSystem%St_Mud_Forehead_section%Array(imud)= MudSystem%St_Mud_Backhead_section%Array(imud)
                MudSystem%St_Mud_Forehead_X%Array(imud)= MudSystem%St_Mud_Backhead_X%Array(imud)+ MudSystem%DirectionCoef*(MudSystem%St_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_PipeSectionFt(MudSystem%St_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                MudSystem%isection= MudSystem%St_Mud_Backhead_section%Array(imud)+1
                MudSystem%St_RemainedVolume_in_LastSection%Array(imud)= MudSystem%St_MudDischarged_Volume%Array(imud)- MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (MudSystem%isection > F_Counts%StringIntervalCounts) then        ! last pipe section(string exit) F_Counts%StringIntervalCounts includes Horizontal line
                            MudSystem%St_MudDischarged_Volume%Array(imud)= MudSystem%St_MudDischarged_Volume%Array(imud)- MudSystem%St_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%St_Mud_Forehead_X%Array(imud)= MudSystem%Xend_PipeSection(F_Counts%StringIntervalCounts)
                            MudSystem%St_Mud_Forehead_section%Array(imud)= F_Counts%StringIntervalCounts
                            
                            if (MudSystem%St_MudDischarged_Volume%Array(imud)<= 0.0d0)  then     ! imud is completely exited form the string
                                call RemoveStringMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystem%xx= MudSystem%St_RemainedVolume_in_LastSection%Array(imud)/ MudSystem%PipeSection_VolumeCapacity(MudSystem%isection)   !(gal)
                        
                    if (MudSystem%xx<= 1.0) then
                        MudSystem%St_Mud_Forehead_section%Array(imud)= MudSystem%isection
                        MudSystem%St_Mud_Forehead_X%Array(imud)= (MudSystem%xx * (MudSystem%Xend_PipeSection(MudSystem%isection)- MudSystem%Xstart_PipeSection(MudSystem%isection)))+ MudSystem%Xstart_PipeSection(MudSystem%isection)
                        exit
                    else
                        MudSystem%St_RemainedVolume_in_LastSection%Array(imud)= MudSystem%St_RemainedVolume_in_LastSection%Array(imud)- MudSystem%PipeSection_VolumeCapacity(MudSystem%isection)
                        MudSystem%isection= MudSystem%isection+ 1
                        
                                
                    endif

                enddo
            
            endif   

    enddo
    
    
    !write(*,*) ' a before=='
    !    
    !    do imud=1, Op_MudDischarged_Volume%Length()
    !        write(*,*) 'Op:', imud, Op_MudDischarged_Volume%Array(imud), Op_Density%Array(imud) ,Op_MudOrKick%Array(imud)
    !    enddo             
    !    
    !    do imud=1, Ann_MudDischarged_Volume%Length()
    !        write(*,*) 'Ann:', imud, Ann_MudDischarged_Volume%Array(imud), Ann_Density%Array(imud) ,Ann_MudOrKick%Array(imud)
    !    enddo
    !
    !write(*,*) '==== a before'     
    
    
    
    
 !write(*,*) ' iloc (a): ' , iloc   
    
!========================STRING END=================
    
    IF (MudSystem%Op_MudOrKick%Last() /= 0 .and. MudSystem%Op_MudOrKick%Last()==MudSystem%Ann_MudOrKick%First())  MudSystem%iLoc=2   ! it may be 1,2,3 or more,  all of them are kick 
!write(*,*) ' iloc (b): ' , iloc

!=============================Add PumpFlowRate to Bottom Hole ==============================    
        !if ( MudSystem%AnnulusFlowRate>0.0 ) then 
        if ( MudSystem%MudVolume_InjectedToBH > 0.0 ) then 
            
            
                if (KickVARIABLES%KickOffBottom) then                         ! (kickOffBottom = F) means kick is next to the bottom hole and usually kick is entering the
                    AddLocation= MudSystem%Op_Density%Length()-MudSystem%iLoc+1+1    ! well, thus pumped mud should be placed above the kick
                else
                    AddLocation= MudSystem%Op_Density%Length()+1
                endif
 !write(*,*) 'AddLocation====' , AddLocation
                if ( AddLocation== 0)      CALL ErrorStop ('AddLocation=0')
 
                
                if ( ABS(MudSystem%St_Density%Last() - MudSystem%Op_Density%Array(AddLocation-1)) >= MudSystem%DensityMixTol ) then
                    !write(*,*) 'new pocket**'
                    !write(*,*) MudSystem%St_Density%Last()=' ,MudSystem%St_Density%Last()
                    !write(*,*) 'Op_Density%Array(AddLocation-1)=' , Op_Density%Array(AddLocation-1)
                    

                    call MudSystem%Op_Density% AddTo (AddLocation,MudSystem%St_Density%Last())
                    !call Op_MudDischarged_Volume%AddTo (AddLocation,((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline))
                    call MudSystem%Op_MudDischarged_Volume%AddTo (AddLocation,MudSystem%MudVolume_InjectedToBH)
                    call MudSystem%Op_Mud_Forehead_X%AddTo (AddLocation,MudSystem%Xstart_OpSection(1))
                    call MudSystem%Op_Mud_Forehead_section%AddTo (AddLocation,1)
                    call MudSystem%Op_Mud_Backhead_X%AddTo (AddLocation,MudSystem%Xstart_OpSection(1))
                    call MudSystem%Op_Mud_Backhead_section%AddTo (AddLocation,1)
                    call MudSystem%Op_RemainedVolume_in_LastSection%AddTo (AddLocation,0.0d0)
                    call MudSystem%Op_EmptyVolume_inBackheadLocation%AddTo (AddLocation,0.0d0)
                    call MudSystem%Op_MudOrKick%AddTo (AddLocation,0) 
                else
                    !write(*,*) 'merge**'
                    !write(*,*) 'density before=' , Op_Density%Array(AddLocation-1)
                    !write(*,*) MudSystem%St_Density%Last() for mix=' ,MudSystem%St_Density%Last()
       
                    !Op_Density%Array(AddLocation-1)= (Op_Density%Array(AddLocation-1)*Op_MudDischarged_Volume%Array(AddLocation-1)MudSystem%St_Density%Last()*((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline))/(Op_MudDischarged_Volume%Array(AddLocation-1)+((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline))
                    !Op_MudDischarged_Volume%Array(AddLocation-1)= Op_MudDischarged_Volume%Array(AddLocation-1) + ((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline)
                    
                    MudSystem%Op_Density%Array(AddLocation-1)= (MudSystem%Op_Density%Array(AddLocation-1)*MudSystem%Op_MudDischarged_Volume%Array(AddLocation-1)+MudSystem%St_Density%Last()*MudSystem%MudVolume_InjectedToBH)/(MudSystem%Op_MudDischarged_Volume%Array(AddLocation-1)+MudSystem%MudVolume_InjectedToBH)
                    MudSystem%Op_MudDischarged_Volume%Array(AddLocation-1)= MudSystem%Op_MudDischarged_Volume%Array(AddLocation-1) + MudSystem%MudVolume_InjectedToBH
                    !write(*,*) 'density after=' ,   Op_Density%Array(AddLocation-1)
                    
                endif
    
        endif   
!=======================Add PumpFlowRate to Bottom Hole- End ==============================    
    
    

    
!=============== save OP Mud data to transfer to the annulus enterance due to tripin or kick    
    MudSystem%OpMudVolumeSum= 0.d0
    !Op_MudSaved_Density= 0.d0
    !Op_KickSaved_Density= 0.d0
    MudSystem%Op_Saved_MudDischarged_Volume= 0.d0
    MudSystem%Op_Kick_Saved_Volume= 0.d0
    MudSystem%Saved_Op_MudOrKick= 0
    
    
    
    !write(*,*) 'Op_Capacity===' , sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))
    !write(*,*) 'Op_MudDischarged_Volume%Length()===' , Op_MudDischarged_Volume%Length()
    !
    
    do imud=1, MudSystem%Op_MudDischarged_Volume%Length()
        !write(*,*) 'imud, Op_MudDischarged_Volume%Array(imud)=' , imud,Op_MudDischarged_Volume%Array(imud)
        
            MudSystem%OpMudVolumeSum= MudSystem%OpMudVolumeSum + MudSystem%Op_MudDischarged_Volume%Array(imud)
        
        if ( MudSystem%OpMudVolumeSum > sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts)) ) then
            
            IF (MudSystem%Op_MudOrKick%Array(imud) == 0) THEN
                MudSystem%Op_MudSaved_Density = MudSystem%Op_Density%Array(imud)
                MudSystem%Op_Saved_MudDischarged_Volume = MudSystem%OpMudVolumeSum - sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts))
            ELSE
                MudSystem%Op_Kick_Saved_Volume = MudSystem%OpMudVolumeSum - sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts))
                !write(*,*) 'cond 1- Op_MudOrKick%Array (imud),Op_Density%Array(imud):' ,Op_MudOrKick%Array (imud),Op_Density%Array(imud)
                MudSystem%Saved_Op_MudOrKick= MudSystem%Op_MudOrKick%Array (imud)
                MudSystem%Op_KickSaved_Density= MudSystem%Op_Density%Array(imud)
                MudSystem%iLoc= 2
            END IF
            
            do ii= imud + 1, MudSystem%Op_MudDischarged_Volume%Length()
                IF (MudSystem%Op_MudOrKick%Array(ii) == 0) THEN
                    MudSystem%Op_MudSaved_Density = ((MudSystem%Op_MudSaved_Density * MudSystem%Op_Saved_MudDischarged_Volume) + (MudSystem%Op_Density%Array(ii) * MudSystem%Op_MudDischarged_Volume%Array(ii))) / (MudSystem%Op_Saved_MudDischarged_Volume + MudSystem%Op_MudDischarged_Volume%Array(ii))
                    MudSystem%Op_Saved_MudDischarged_Volume = MudSystem%Op_Saved_MudDischarged_Volume + MudSystem%Op_MudDischarged_Volume%Array(ii)
                ELSE
                    MudSystem%Op_Kick_Saved_Volume = MudSystem%Op_Kick_Saved_Volume + MudSystem%Op_MudDischarged_Volume%Array(ii)
                !write(*,*) 'cond 2- Op_MudOrKick%Array (ii),Op_Density%Array(ii):' ,Op_MudOrKick%Array (ii),Op_Density%Array(ii)
                    MudSystem%Saved_Op_MudOrKick= MudSystem%Op_MudOrKick%Array (ii)
                    MudSystem%Op_KickSaved_Density= MudSystem%Op_Density%Array(ii)
                    MudSystem%iLoc= 2
                END IF
            enddo
            
            exit ! exits do
            
        endif
        
    enddo
            !WRITE (*,*) 'Op_Saved_MudDischarged_Volume, Op_Kick_Saved_Volume',Op_Saved_MudDischarged_Volume, Op_Kick_Saved_Volume
!write(*,*) ' iloc (c): ' , iloc
    
!======================================================================   

!======================================================================   
    
        

                
    
    !if (iLoc == 1) then
        MudSystem%MudSection= F_Counts%StringIntervalCounts+1
        MudSystem%BackheadX= MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1)
    !elseif (iLoc == 2) then
    !    MudSection= Kick_Forehead_section
    !    BackheadX= Kick_Forehead_X
    !endif

!========================ANNULUS ENTRANCE====================
    !if (KickMigration_2SideBit == .FALSE.) then     ! because its effect is applied in Migration Code
    !            !write(*,*) 'iloc=====' , iLoc     bejaye ROP_Bit%RateOfPenetration ==0.   in bude:   DeltaVolumeOp == 0.0
    !    if (ABS(AnnulusSuctionDensity_OldMudSystem%St_Density%Last()) >= DensityMixTol  .OR. (DeltaVolumeOp == 0.0 .and. ABS(Ann_Density%Array(iLoc)MudSystem%St_Density%Last())>=DensityMixTol .and. MudSystem%AnnulusFlowRate/=0.0d0) ) then ! new mud is pumped
    !    call Ann_Density%AddTo (iLocMudSystem%St_Density%Last())
    !    call Ann_MudDischarged_Volume%AddTo (iLoc,0.0d0)
    !    call Ann_Mud_Forehead_X%AddTo (iLoc,BackheadX)
    !    call Ann_Mud_Forehead_section%AddTo (iLoc,MudSection)
    !    call Ann_Mud_Backhead_X%AddTo (iLoc,BackheadX)
    !    call Ann_Mud_Backhead_section%AddTo (iLoc,MudSection)
    !    call Ann_RemainedVolume_in_LastSection%AddTo (iLoc,0.0d0)
    !    call Ann_EmptyVolume_inBackheadLocation%AddTo (iLoc,0.0d0)
    !    call Ann_MudOrKick%AddTo (iLoc,0)
    !    call Ann_CuttingMud%AddTo (iLoc,0)
    !            !write(*,*) 'c) annLength=' , Ann_Density%Length()
    !         
    !    AnnulusSuctionDensity_Old=MudSystem%St_Density%Last()
    !        
    !    MudIsChanged= .true.
    !    endif  
    !
    !            Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+ ((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline)    !(gal)
    !
    !endif
    


        
            
        
         MudSystem%Ann_Mud_Backhead_section%Array(1)= MudSystem%MudSection !it is needed to be updated for a condition that one pipe is removed from Annulus due to trip out
         MudSystem%Ann_Mud_Backhead_X%Array(1)= MudSystem%BackheadX
     
         
         
    !    write(*,*)  'zero)Ann_Mud sum=' , sum(Ann_MudDischarged_Volume%Array(:))  
    !    
    !    
    !write(*,*) 'pump added-before add to ann=='
    !    
    !    do imud=1, Op_MudDischarged_Volume%Length()
    !        write(*,*) 'Op:', imud, Op_MudDischarged_Volume%Array(imud), Op_Density%Array(imud) ,Op_MudOrKick%Array(imud)
    !    enddo             
    !    
    !    do imud=1, Ann_MudDischarged_Volume%Length()
    !        write(*,*) 'Ann:', imud, Ann_MudDischarged_Volume%Array(imud), Ann_Density%Array(imud) ,Ann_MudOrKick%Array(imud)
    !    enddo
    !
    !write(*,*) '====pump added-before add to ann'         
        
        
         
!========================Tripping In==================== 

!write(*,*) 'DeltaVolumeOp=' , DeltaVolumeOp
        if (ROP_Bit%RateOfPenetration==0.) then    ! .and. Op_MudOrKick%Last() == 0) then      ! trip in mode(loole paeen) Mud
                
                !write(*,*) 'Tripping In'
                !write(*,*) 'before' ,'Ann_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)

                !if ( MudIsChanged== .true. ) then
                !    call RemoveAnnulusMudArrays(iLoc) 
                !endif

                
                if (MudSystem%Op_Kick_Saved_Volume > 0.0 .and. MudSystem%Ann_MudOrKick%First() == 0) then
                    write(*,*) 'Kick influx enters Annulus'
                    call MudSystem%Ann_Density%AddToFirst (MudSystem%Op_KickSaved_Density)
                    call MudSystem%Ann_MudDischarged_Volume%AddToFirst (MudSystem%Op_Kick_Saved_Volume)
                    call MudSystem%Ann_Mud_Forehead_X%AddToFirst (MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1))
                    call MudSystem%Ann_Mud_Forehead_section%AddToFirst (F_Counts%StringIntervalCounts+1)
                    call MudSystem%Ann_Mud_Backhead_X%AddToFirst (MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1))
                    call MudSystem%Ann_Mud_Backhead_section%AddToFirst (F_Counts%StringIntervalCounts+1)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0) 
                    call MudSystem%Ann_MudOrKick%AddToFirst (MudSystem%Saved_Op_MudOrKick)      !<<<<<<<<
                    call MudSystem%Ann_CuttingMud%AddToFirst (0)
                elseif (MudSystem%Op_Kick_Saved_Volume > 0.0 .and. MudSystem%Ann_MudOrKick%First() /= 0) then
                    MudSystem%Ann_MudDischarged_Volume%Array(1)= MudSystem%Ann_MudDischarged_Volume%Array(1) + MudSystem%Op_Kick_Saved_Volume
                endif
                
                
            if (MudSystem%Op_Saved_MudDischarged_Volume> 0.0) then
                MudSystem%NewDensity= MudSystem%Op_MudSaved_Density
                MudSystem%NewVolume= MudSystem%Op_Saved_MudDischarged_Volume
                !write(*,*) 'NewVolume=' , NewVolume
                !write(*,*) 'iloc=' , iloc,'Ann_MudDischarged_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                

                
                if ((ROP_Bit%RateOfPenetration==0 .and. abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%DensityMixTol) &
                .or. (ROP_Bit%RateOfPenetration>0. .and. MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)==1 .and. abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%CuttingDensityMixTol) &
                .or. (ROP_Bit%RateOfPenetration>0. .and. MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)==0 .and. MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc) < 42.) ) then   ! 1-Pockets are Merged
                 
                    MudSystem%Ann_Density%Array(MudSystem%iLoc)= (MudSystem%Ann_Density%Array(MudSystem%iLoc)*MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewDensity*MudSystem%NewVolume)/(MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume)
                    MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume
                    MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                    MudSystem%Ann_Mud_Forehead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                    MudSystem%Ann_Mud_Backhead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                    MudSystem%Ann_Mud_Backhead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                    MudSystem%Ann_RemainedVolume_in_LastSection%Array(MudSystem%iLoc)= (0.0d0)
                    MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(MudSystem%iLoc)= (0.0d0) 
                !write(*,*) 'merge' ,'Ann_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                    
                else       ! 2-Merging conditions are not meeted, so new pocket
                    call MudSystem%Ann_Density%AddTo (MudSystem%iLoc,MudSystem%NewDensity)
                    call MudSystem%Ann_MudDischarged_Volume%AddTo (MudSystem%iLoc,MudSystem%NewVolume)
                    call MudSystem%Ann_Mud_Forehead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                    call MudSystem%Ann_Mud_Forehead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                    call MudSystem%Ann_Mud_Backhead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                    call MudSystem%Ann_Mud_Backhead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%AddTo (MudSystem%iLoc,0.0d0)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystem%iLoc,0.0d0)
                    call MudSystem%Ann_MudOrKick%AddTo (MudSystem%iLoc,0)
                    call MudSystem%Ann_CuttingMud%AddTo (MudSystem%iLoc,0)
                    !write(*,*) 'd) annLength=' , Ann_Density%Length()
                !write(*,*) 'new' ,'Ann_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                
                endif
            endif
     
        endif   
             
!========================Tripping In - End==================== 
            
!========================Drilling Mode========================            
            
        if (ROP_Bit%RateOfPenetration>0. .and. MudSystem%DeltaVolumeOp>0.0) then      ! trip in mode(loole paeen)   DrillingMode== .true.
            !write(*,*) 'Drilling Mode'
        
                !if ( MudIsChanged== .true. ) then
                !    call RemoveAnnulusMudArrays(iLoc) 
                !endif                
                !write(*,*) 'before' ,'Ann_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                
                
                !MudSystem%NewDensity= MudSystem%St_Density%Last() * MudSystem%AnnulusFlowRate + 141.4296E-4*ROP_Bit%RateOfPenetration*ROP_Spec%DiameterOfBit**2)/(MudSystem%AnnulusFlowRate+6.7995E-4*ROP_Bit%RateOfPenetration*Diameter_of_Bit**2)
                
                MudSystem%NewDensity=MudSystem%St_Density%Last()
                
                
                !NewVolume= ((MudSystem%AnnulusFlowRate/60.0d0)*DeltaT_Mudline)+DeltaVolumeOp
                !!! Density in ppg, flow rate in gpm, ROP in ft/s, bit diameter in inch         

                
                do imud=1, MudSystem%Op_MudDischarged_Volume%Length()
                    if ( MudSystem%Op_MudOrKick%Array(imud) == 0 ) then
                        MudSystem%Op_Density%Array(imud)= MudSystem%NewDensity
                        
                    endif
                enddo
                
                
                
                if (MudSystem%Op_Kick_Saved_Volume > 0.0 .and. MudSystem%Ann_MudOrKick%First() == 0) then
                    write(*,*) 'Kick influx enters Annulus first time'
                    !write(*,*) 'Saved_Op_MudOrKick=',Saved_Op_MudOrKick
                    call MudSystem%Ann_Density%AddToFirst (MudSystem%Op_KickSaved_Density)
                    call MudSystem%Ann_MudDischarged_Volume%AddToFirst (MudSystem%Op_Kick_Saved_Volume)
                    call MudSystem%Ann_Mud_Forehead_X%AddToFirst (MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1))
                    call MudSystem%Ann_Mud_Forehead_section%AddToFirst (F_Counts%StringIntervalCounts+1)
                    call MudSystem%Ann_Mud_Backhead_X%AddToFirst (MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1))
                    call MudSystem%Ann_Mud_Backhead_section%AddToFirst (F_Counts%StringIntervalCounts+1)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0) 
                    call MudSystem%Ann_MudOrKick%AddToFirst (MudSystem%Saved_Op_MudOrKick)      !<<<<<<<<
                    call MudSystem%Ann_CuttingMud%AddToFirst (0)
                elseif (MudSystem%Op_Kick_Saved_Volume > 0.0 .and. MudSystem%Ann_MudOrKick%First() /= 0) then
                    MudSystem%Ann_MudDischarged_Volume%Array(1)= MudSystem%Ann_MudDischarged_Volume%Array(1) + MudSystem%Op_Kick_Saved_Volume
                endif
                
                
            if (MudSystem%Op_Saved_MudDischarged_Volume> 0.0) then
                !write(*,*) 'Op_Saved_Mud added'
                MudSystem%NewDensity= MudSystem%NewDensity  !(drilling density)
                MudSystem%NewVolume= MudSystem%Op_Saved_MudDischarged_Volume + MudSystem%DeltaVolumeOp        ! (DeltaVolumeOp: for Cuttings Volume)
                !write(*,*) 'NewVolume=' , NewVolume
                !write(*,*) 'iloc=' , iloc,'Ann_MudDischarged_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                
                 if ( (MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)==1 .and. abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%CuttingDensityMixTol ) &  
                    .or. (MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)==0 .and. MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc) < 42.) ) then   ! 1-Pockets are Merged
                                  
                     MudSystem%Ann_Density%Array(MudSystem%iLoc)= (MudSystem%Ann_Density%Array(MudSystem%iLoc)*MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewDensity*MudSystem%NewVolume)/(MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume)
                     MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume
                     MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                     MudSystem%Ann_Mud_Forehead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                     MudSystem%Ann_Mud_Backhead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                     MudSystem%Ann_Mud_Backhead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                     MudSystem%Ann_RemainedVolume_in_LastSection%Array(MudSystem%iLoc)= (0.0d0)
                     MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(MudSystem%iLoc)= (0.0d0) 
                     MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)= 1
                !write(*,*) 'merge' ,'Ann_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                     
                 else        ! 2-Merging conditions are not meeted, so new pocket
                    !write(*,*) 'before e) ', iloc, Ann_Density%Array(iLoc),MudSystem%NewDensity
                    !write(*,*) 'before e) Ann_MudDischarged_Volume%Array(iLoc)=' , Ann_MudDischarged_Volume%Array(iLoc)
                
                 
                    call MudSystem%Ann_Density%AddTo (MudSystem%iLoc,MudSystem%NewDensity)
                    call MudSystem%Ann_MudDischarged_Volume%AddTo (MudSystem%iLoc,MudSystem%NewVolume)
                    call MudSystem%Ann_Mud_Forehead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                    call MudSystem%Ann_Mud_Forehead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                    call MudSystem%Ann_Mud_Backhead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                    call MudSystem%Ann_Mud_Backhead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%AddTo (MudSystem%iLoc,0.0d0)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystem%iLoc,0.0d0)
                    call MudSystem%Ann_MudOrKick%AddTo (MudSystem%iLoc,0)
                    call MudSystem%Ann_CuttingMud%AddTo (MudSystem%iLoc,1)  ! 1= cutting  0= mud
                !write(*,*) 'new' ,'Ann_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                    
                    !write(*,*) 'e) annLength=' , Ann_Density%Length()
                
                
            endif 
                

            endif                

        endif  
!===================================================================         

    !write(*,*) 'after add to ann=='
    !    
    !    do imud=1, Op_MudDischarged_Volume%Length()
    !        write(*,*) 'Op:', imud, Op_MudDischarged_Volume%Array(imud), Op_Density%Array(imud) ,Op_MudOrKick%Array(imud)
    !    enddo             
    !    
    !    do imud=1, Ann_MudDischarged_Volume%Length()
    !        write(*,*) 'Ann:', imud, Ann_MudDischarged_Volume%Array(imud), Ann_Density%Array(imud) ,Ann_MudOrKick%Array(imud)
    !    enddo
    !
    !write(*,*) '==after add to ann'  
        
                    MudSystem%NewVolume= ((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) - MudSystem%Op_Saved_MudDischarged_Volume

                if (MudSystem%iLoc==2 .and. MudSystem%Op_MudOrKick%Last()==0 .and. MudSystem%NewVolume > 0.d0 ) then                    ! for avoid kick separation
                    !write(*,*) 'avoid kick separation'

                    
                    MudSystem%NewDensity= MudSystem%Op_MudSaved_Density
                    
                    call RemoveOpMudArrays(MudSystem%Op_Density%Length()) ! mud here is removed and then will be added to iloc=2 in Ann
                    if ( MudSystem%Ann_MudDischarged_Volume%Array(1) > ((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline)- MudSystem%Op_Saved_MudDischarged_Volume) then! 1st in Ann = kick
                        !write(*,*) 'mode1'
                        MudSystem%Ann_MudDischarged_Volume%Array(1)= MudSystem%Ann_MudDischarged_Volume%Array(1) - (((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) -MudSystem%Op_Saved_MudDischarged_Volume)
                        MudSystem%Op_MudDischarged_Volume%Array(MudSystem%Op_Density%Length())= MudSystem%Op_MudDischarged_Volume%Array(MudSystem%Op_Density%Length())+ (((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) - MudSystem%Op_Saved_MudDischarged_Volume)  !kick
                    else
                        call RemoveAnnulusMudArrays(1)  !kick is removed
                        MudSystem%iLoc= 1
                        MudSystem%Op_MudDischarged_Volume%Array(MudSystem%Op_Density%Length())= MudSystem%Op_MudDischarged_Volume%Array(MudSystem%Op_Density%Length())+ (((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) - MudSystem%Op_Saved_MudDischarged_Volume)
                        !write(*,*) 'mode2'

                        ! including  a little expand
                    endif

                
                if ((ROP_Bit%RateOfPenetration==0 .and. abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%DensityMixTol) &
                .or. (ROP_Bit%RateOfPenetration>0. .and. MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)==1 .and. abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%CuttingDensityMixTol) &
                .or. (ROP_Bit%RateOfPenetration>0. .and. MudSystem%Ann_CuttingMud%Array(MudSystem%iLoc)==0 .and. MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc) < 42.) ) then   ! 1-Pockets are Merged
                 
                    MudSystem%Ann_Density%Array(MudSystem%iLoc)= (MudSystem%Ann_Density%Array(MudSystem%iLoc)*MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewDensity*MudSystem%NewVolume)/(MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume)
                    MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume
                    MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                    MudSystem%Ann_Mud_Forehead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                    MudSystem%Ann_Mud_Backhead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                    MudSystem%Ann_Mud_Backhead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                    MudSystem%Ann_RemainedVolume_in_LastSection%Array(MudSystem%iLoc)= (0.0d0)
                    MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(MudSystem%iLoc)= (0.0d0)                    
                else       ! 2-Merging conditions are not meeted, so new pocket
                    call MudSystem%Ann_Density%AddTo (MudSystem%iLoc,MudSystem%NewDensity)
                    call MudSystem%Ann_MudDischarged_Volume%AddTo (MudSystem%iLoc,MudSystem%NewVolume)
                    call MudSystem%Ann_Mud_Forehead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                    call MudSystem%Ann_Mud_Forehead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                    call MudSystem%Ann_Mud_Backhead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                    call MudSystem%Ann_Mud_Backhead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%AddTo (MudSystem%iLoc,0.0d0)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystem%iLoc,0.0d0)
                    call MudSystem%Ann_MudOrKick%AddTo (MudSystem%iLoc,0)
                    call MudSystem%Ann_CuttingMud%AddTo (MudSystem%iLoc,0)
                    !write(*,*) 'd) annLength=' , Ann_Density%Length()
                
                endif
                    

                endif        
!=================================================================== 
         if( MudSystem%Op_MudOrKick%Last() == 1 .and. MudSystem%Ann_MudOrKick%First() == 0 ) then
             
        write(*,*) '***error2****=='
        
        write(*,*) 'Op_Kick_Saved_Volume,Op_Saved_MudDischarged_Volume=' , MudSystem%Op_Kick_Saved_Volume,MudSystem%Op_Saved_MudDischarged_Volume
        

    write(*,*) 'after add to ann=='
        
        do imud=1, MudSystem%Op_MudDischarged_Volume%Length()
            write(*,*) 'Op:', imud, MudSystem%Op_MudDischarged_Volume%Array(imud), MudSystem%Op_Density%Array(imud) ,MudSystem%Op_MudOrKick%Array(imud)
        enddo             
        
        do imud=1, MudSystem%Ann_MudDischarged_Volume%Length()
            write(*,*) 'Ann:', imud, MudSystem%Ann_MudDischarged_Volume%Array(imud), MudSystem%Ann_Density%Array(imud) ,MudSystem%Ann_MudOrKick%Array(imud)
        enddo
    
    write(*,*) '==after add to ann'  
                            
        write(*,*) 'NewVolume,Op_MudOrKick%Last=' , MudSystem%NewVolume,MudSystem%Op_MudOrKick%Last()
        write(*,*) '==***error2****'
        
        endif
                
                
                
                
                
!=============== save Ann Mud data to transfer to the ChokeLine enterance 
    MudSystem%AnnMudVolumeSum= 0.d0
    !Ann_MudSaved_Density= 0.d0
    !Ann_KickSaved_Density= 0.d0
    MudSystem%Ann_Saved_MudDischarged_Volume= 0.d0
    MudSystem%Ann_Kick_Saved_Volume= 0.d0
    MudSystem%Saved_Ann_MudOrKick= 0
    MudSystem%Ann_to_Choke_2mud= .false.
    
    
    
    
    do imud=1, MudSystem%Ann_MudDischarged_Volume%Length()
        
            MudSystem%AnnMudVolumeSum= MudSystem%AnnMudVolumeSum + MudSystem%Ann_MudDischarged_Volume%Array(imud)
        
        if ( MudSystem%AnnMudVolumeSum > sum(MudSystem%PipeSection_VolumeCapacity(F_Counts%StringIntervalCounts+1:MudSystem%NoPipeSections)) ) then
            
            IF (MudSystem%Ann_MudOrKick%Array(imud) == 0) THEN
                MudSystem%Ann_MudSaved_Density = MudSystem%Ann_Density%Array(imud)
                MudSystem%Ann_Saved_MudDischarged_Volume = MudSystem%AnnMudVolumeSum - sum(MudSystem%PipeSection_VolumeCapacity(F_Counts%StringIntervalCounts+1:MudSystem%NoPipeSections))
            ELSEIF (MudSystem%Ann_MudOrKick%Array(imud) > 0 .AND. MudSystem%Ann_MudOrKick%Array(imud) <100) THEN        ! 104= AIR
                MudSystem%Ann_Kick_Saved_Volume = MudSystem%AnnMudVolumeSum - sum(MudSystem%PipeSection_VolumeCapacity(F_Counts%StringIntervalCounts+1:MudSystem%NoPipeSections))
                MudSystem%Saved_Ann_MudOrKick= MudSystem%Ann_MudOrKick%Array (imud)
                MudSystem%Ann_KickSaved_Density= MudSystem%Ann_Density%Array(imud)
            END IF
            
            do ii= imud + 1, MudSystem%Ann_MudDischarged_Volume%Length()
                IF (MudSystem%Ann_MudOrKick%Array(ii) == 0) THEN
                    MudSystem%Ann_MudSaved_Density = ((MudSystem%Ann_MudSaved_Density * MudSystem%Ann_Saved_MudDischarged_Volume) + (MudSystem%Ann_Density%Array(ii) * MudSystem%Ann_MudDischarged_Volume%Array(ii))) / (MudSystem%Ann_Saved_MudDischarged_Volume + MudSystem%Ann_MudDischarged_Volume%Array(ii))
                    MudSystem%Ann_Saved_MudDischarged_Volume = MudSystem%Ann_Saved_MudDischarged_Volume + MudSystem%Ann_MudDischarged_Volume%Array(ii)
                    MudSystem%Ann_to_Choke_2mud= .true.
                ELSEIF (MudSystem%Ann_MudOrKick%Array(ii) > 0 .AND. MudSystem%Ann_MudOrKick%Array(ii) <100) THEN        ! 104= AIR
                    MudSystem%Ann_Kick_Saved_Volume = MudSystem%Ann_Kick_Saved_Volume + MudSystem%Ann_MudDischarged_Volume%Array(ii)
                    MudSystem%Saved_Ann_MudOrKick= MudSystem%Ann_MudOrKick%Array (ii)
                    MudSystem%Ann_KickSaved_Density= MudSystem%Ann_Density%Array(ii)
                END IF
            enddo
            
            
            !WRITE (*,*) 'Ann_Saved_Mud_Volume, Ann_Kick_Saved_Volume', Ann_Saved_MudDischarged_Volume, Ann_Kick_Saved_Volume
            exit
            
        endif
        
    enddo
MudSystem%Ann_Saved_MudDischarged_Volume_Final= MudSystem%Ann_Saved_MudDischarged_Volume !+ Ann_Kick_Saved_Volume
MudSystem%Ann_Kick_Saved_Volume_Final= MudSystem%Ann_Kick_Saved_Volume
IF (MudSystem%WellHeadIsOpen)       MudSystem%MudVolume_InjectedFromAnn = MudSystem%Ann_Saved_MudDischarged_Volume_Final -((MudSystem%Qlost/60.0d0)*MudSystem%DeltaT_Mudline)
!WRITE (*,*) 'MudSystem%MudVolume_InjectedFromAnn=', MudSystem%MudVolume_InjectedFromAnn
!======================================================================                  
                
        !write(*,*)  'c)Ann_Mud sum=' , sum(Ann_MudDischarged_Volume%Array(:)) 
        !write(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
        !write(*,*)  'Ann_Saved_Mud=' , Ann_Saved_MudDischarged_Volume
        
        MudSystem%total_injected = MudSystem%total_injected + MudSystem%MudVolume_InjectedFromAnn
        
                    if (ChokeControlPanel%ChokePanelStrokeResetSwitch == 1) then
                        MudSystem%total_injected= 0.
                    endif        
        
        !write(*,*) ' total injected-tripin =' , total_injected
        !write(*,*) 'injected-tripin =' , MudSystem%MudVolume_InjectedFromAnn
        
        
        
     
                
!======================== Annulus ==================== 
             
                   !MudIsChanged= .false.          
                
imud= 0

    do while (imud < MudSystem%Ann_Mud_Forehead_X%Length())
        imud = imud + 1
        
            if (imud> 1) then
                MudSystem%Ann_Mud_Backhead_X%Array(imud)= MudSystem%Ann_Mud_Forehead_X%Array(imud-1)
                MudSystem%Ann_Mud_Backhead_section%Array(imud)= MudSystem%Ann_Mud_Forehead_section%Array(imud-1)
            endif
           

            
!       <<< Fracture Shoe Lost            
            IF ( MudSystem%ShoeLost .and. Shoe%ShoeDepth < MudSystem%Ann_Mud_Backhead_X%Array(imud) .and. Shoe%ShoeDepth >= MudSystem%Ann_Mud_Forehead_X%Array(imud) ) then
                !write(*,*) 'ShoeLost   imud,AnnVolume(imud), VolumeLost:' , imud,Ann_MudDischarged_Volume%Array(imud), (( Qlost/60.0d0)*DeltaT_Mudline)
                MudSystem%Ann_MudDischarged_Volume%Array(imud)= MudSystem%Ann_MudDischarged_Volume%Array(imud)-((MudSystem%Qlost/60.0d0)*MudSystem%DeltaT_Mudline)    !(gal)
                if (MudSystem%Ann_MudDischarged_Volume%Array(imud) < 0.0) then
                    !write(*,*) 'mud is removed by shoe lost, imud=' , imud
                    call RemoveAnnulusMudArrays(imud)
                    imud= imud-1
                    cycle
                endif
                
            ENDIF
!           Fracture Shoe Lost >>>        
            
            
            MudSystem%DirectionCoef= (MudSystem%Xend_PipeSection(MudSystem%Ann_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%Ann_Mud_Backhead_section%Array(imud))) &
                / ABS(MudSystem%Xend_PipeSection(MudSystem%Ann_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%Ann_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Xend_PipeSection(MudSystem%Ann_Mud_Backhead_section%Array(imud))- MudSystem%Ann_Mud_Backhead_X%Array(imud))* &
                MudSystem%Area_PipeSectionFt(MudSystem%Ann_Mud_Backhead_section%Array(imud)) !(ft^3)          
            MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal
            
         
            if ( MudSystem%Ann_MudDischarged_Volume%Array(imud) <= MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(imud)) then
                MudSystem%Ann_Mud_Forehead_section%Array(imud)= MudSystem%Ann_Mud_Backhead_section%Array(imud)
                MudSystem%Ann_Mud_Forehead_X%Array(imud)= MudSystem%Ann_Mud_Backhead_X%Array(imud)+ MudSystem%DirectionCoef*(MudSystem%Ann_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_PipeSectionFt(MudSystem%Ann_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                MudSystem%isection= MudSystem%Ann_Mud_Backhead_section%Array(imud)+1
                MudSystem%Ann_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Ann_MudDischarged_Volume%Array(imud)- MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (MudSystem%isection > MudSystem%NoPipeSections) then        ! last pipe section(well exit)
                            MudSystem%Ann_MudDischarged_Volume%Array(imud)= MudSystem%Ann_MudDischarged_Volume%Array(imud)- MudSystem%Ann_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%Ann_Mud_Forehead_X%Array(imud)= MudSystem%Xend_PipeSection(MudSystem%NoPipeSections)
                            MudSystem%Ann_Mud_Forehead_section%Array(imud)= MudSystem%NoPipeSections
                                
                            if (MudSystem%Ann_MudDischarged_Volume%Array(imud)<= 0.0d0)  then      ! imud is completely exited form the well
                                !write(*,*) 'remove******'
                                call RemoveAnnulusMudArrays(imud)
                            endif
                            exit
                        endif
                                 
                    MudSystem%xx= MudSystem%Ann_RemainedVolume_in_LastSection%Array(imud)/ MudSystem%PipeSection_VolumeCapacity(MudSystem%isection)   !(gal)
                        
                    if (MudSystem%xx<= 1.0) then
                        MudSystem%Ann_Mud_Forehead_section%Array(imud)= MudSystem%isection
                        MudSystem%Ann_Mud_Forehead_X%Array(imud)= (MudSystem%xx * (MudSystem%Xend_PipeSection(MudSystem%isection)- MudSystem%Xstart_PipeSection(MudSystem%isection)))+ MudSystem%Xstart_PipeSection(MudSystem%isection)
                        exit
                    else
                        MudSystem%Ann_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Ann_RemainedVolume_in_LastSection%Array(imud)- MudSystem%PipeSection_VolumeCapacity(MudSystem%isection)
                        MudSystem%isection= MudSystem%isection+ 1
                                
                    endif

                enddo
            
            endif   
!            write(*,*) 'imud=' , imud
!write(*,*) 'Pinter4 **Ann_Length()=' , Ann_Mud_Forehead_X%Length()
!            write(*,*) 'Ann_Density%Array (imud)=' , Ann_Density%Array (imud)
!
!            
!write(*,*) imud,'Ann_Mud_Forehead_X%Array(imud)=' , Ann_Mud_Forehead_X%Array(imud)

            !if (Ann_Mud_Forehead_X%Array(imud) < Xend_PipeSection(NoPipeSections)) then
            !    Ann_Mud_Forehead_X%Array(imud) = Xend_PipeSection(NoPipeSections)       ! for error preventing
            !endif
            
    !write(*,*) imud, 'Ann_MudDischarged_Volume%Array(imud)=' , Ann_MudDischarged_Volume%Array(imud), Ann_Density%Array(imud)
    

    enddo
    
            if (MudSystem%Ann_Mud_Forehead_X%Last() < MudSystem%Xend_PipeSection(MudSystem%NoPipeSections)) then
                MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%Ann_Mud_Forehead_X%Length()) = MudSystem%Xend_PipeSection(MudSystem%NoPipeSections)       ! for error preventing
            endif
    
!========================ANNULUS END================= 
    !write(*,*) 'sum(Ann_MudDischarged_Volume%Array())=' , sum(Ann_MudDischarged_Volume%Array(:))

!========================================================= 
            
            
    !write(*,*) 'before======2' 
    !
    !    do imud=1, Op_MudDischarged_Volume%Length()
    !        write(*,*) 'Op:', imud, Op_MudDischarged_Volume%Array(imud), Op_Density%Array(imud) ,Op_MudOrKick%Array(imud)
    !    enddo
    !write(*,*) '2======before'  

            
!========================Bottom Hole=================                     
imud=0                     
    do while (imud < MudSystem%Op_Mud_Forehead_X%Length())
        imud = imud + 1
        
            if (imud> 1) then
                MudSystem%Op_Mud_Backhead_X%Array(imud)= MudSystem%Op_Mud_Forehead_X%Array(imud-1)
                MudSystem%Op_Mud_Backhead_section%Array(imud)= MudSystem%Op_Mud_Forehead_section%Array(imud-1)
            endif
            !write(*,*) 'imud**=' , imud
            MudSystem%DirectionCoef= (MudSystem%Xend_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))) &
                / ABS(MudSystem%Xend_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                                           
                                                                                                                    
            MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Xend_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))- MudSystem%Op_Mud_Backhead_X%Array(imud))* &
                MudSystem%Area_OpSectionFt(MudSystem%Op_Mud_Backhead_section%Array(imud)) !(ft^3)          
            MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal
                !write(*,*)  ' Op_EmptyVolume_inBackheadLocation%Array(1) =' , Op_EmptyVolume_inBackheadLocation%Array(1) 
                if ( MudSystem%Op_EmptyVolume_inBackheadLocation%Array(1) < 0.0)      CALL ErrorStop1 ('Negative Empty volume')
            
            if ( MudSystem%Op_MudDischarged_Volume%Array(imud) <= MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)) then
                MudSystem%Op_Mud_Forehead_section%Array(imud)= MudSystem%Op_Mud_Backhead_section%Array(imud)
                MudSystem%Op_Mud_Forehead_X%Array(imud)= MudSystem%Op_Mud_Backhead_X%Array(imud)+ MudSystem%DirectionCoef*(MudSystem%Op_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_OpSectionFt(MudSystem%Op_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                
                    
                MudSystem%isection= MudSystem%Op_Mud_Backhead_section%Array(imud)+1
                MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Op_MudDischarged_Volume%Array(imud)- MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (MudSystem%isection > F_Counts%BottomHoleIntervalCounts) then        ! last pipe section(well exit)
                            !if( imud==1) KickDeltaVinAnnulus= Op_RemainedVolume_in_LastSection%Array(imud)      ! Kick enters Annulus space
                            MudSystem%Op_MudDischarged_Volume%Array(imud)= MudSystem%Op_MudDischarged_Volume%Array(imud)- MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%Op_Mud_Forehead_X%Array(imud)= MudSystem%Xend_OpSection(F_Counts%BottomHoleIntervalCounts)
                            MudSystem%Op_Mud_Forehead_section%Array(imud)= F_Counts%BottomHoleIntervalCounts
                                
                            if (MudSystem%Op_MudDischarged_Volume%Array(imud)<= 0.0d0)  then        ! imud is completely exited form the well
                                call RemoveOpMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystem%xx= MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)/ MudSystem%OpSection_VolumeCapacity(MudSystem%isection)   !(gal)
                        
                    if (MudSystem%xx<= 1.0) then
                        MudSystem%Op_Mud_Forehead_section%Array(imud)= MudSystem%isection
                        MudSystem%Op_Mud_Forehead_X%Array(imud)= (MudSystem%xx * (MudSystem%Xend_OpSection(MudSystem%isection)- MudSystem%Xstart_OpSection(MudSystem%isection)))+ MudSystem%Xstart_OpSection(MudSystem%isection)
                        exit
                    else
                        MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)- MudSystem%OpSection_VolumeCapacity(MudSystem%isection)
                        MudSystem%isection= MudSystem%isection+ 1
                        
                    endif

                enddo
            
            endif  
!       for OP remove:
       
        if (MudSystem%Op_Mud_Forehead_X%Array(imud)== MudSystem%Xend_OpSection(F_Counts%BottomHoleIntervalCounts)) then
            MudSystem%totalLength = MudSystem%Op_MudDischarged_Volume%Length()
            do while(imud < MudSystem%totalLength)
                
                !imud = imud + 1
                call RemoveOpMudArrays(MudSystem%totalLength)
                MudSystem%totalLength = MudSystem%totalLength - 1

                
            enddo
            
            exit ! 
            
        endif       
       
       
       
       
        !if (Op_Mud_Forehead_X%Array(imud)== Xend_OpSection(F_Counts%BottomHoleIntervalCounts)) then
        !    totalLength = Op_MudDischarged_Volume%Length()
        !    do while(imud <= totalLength)
        !        
        !        imud = imud + 1
        !        call RemoveOpMudArrays(imud)
        !        totalLength = totalLength - 1
        !
        !        
        !    enddo
        !    
        !    exit ! 
        !    
        !endif            
  
    enddo
 
       !write(*,*) 'OpSection_VolumeCapacity sum=' , sum(OpSection_VolumeCapacity(:))
       


!========================Bottom Hole END=================             
            
            
    !write(*,*) 'after sorting=='
    !    
    !    do imud=1, Op_MudDischarged_Volume%Length()
    !        write(*,*) 'Op:', imud, Op_MudDischarged_Volume%Array(imud), Op_Density%Array(imud) ,Op_MudOrKick%Array(imud)
    !    enddo             
    !    
    !    do imud=1, Ann_MudDischarged_Volume%Length()
    !        write(*,*) 'Ann:', imud, Ann_MudDischarged_Volume%Array(imud), Ann_Density%Array(imud) ,Ann_MudOrKick%Array(imud)
    !    enddo
    !    
    !    !
    !    !do imud=1, st_MudDischarged_Volume%Length()
    !    !    write(*,*) 'st:', imud, St_MudDischarged_Volume%Array(imud), St_Mud_Backhead_X%Array(imud) ,St_Mud_Forehead_X%Array(imud)
    !    !enddo        
    !
    !write(*,*) '==after sorting'             
     
    
    !    write(*,*) 'after sorting st=='
    !
    !     do imud=1, st_MudDischarged_Volume%Length()
    !        write(*,*) 'st-plot:', imud, St_MudDischarged_Volume%Array(imud), St_Mud_Backhead_X%Array(imud) ,St_Mud_Forehead_X%Array(imud)MudSystem%St_Density%Array(imud)
    !    enddo  
    !
    !write(*,*) '==after sorting st'    
    
    
    
                       
    !write(*,*) '**Ann_Kick_Saved_Final,Mud_InjectedFromAnn' , Ann_Kick_Saved_Volume_Final,MudSystem%MudVolume_InjectedFromAnn              

    end subroutine Pump_and_TripIn
    
    

    
    
    
    
    
    
    
    
 subroutine ChokeLineMud    !  is called in subroutine CirculationCodeSelect
    
        Use GeoElements_FluidModule
        USE CMudPropertiesVariables
        USE MudSystemVARIABLES
        USE Pumps_VARIABLES
        !USE CHOKEVARIABLES
        !USE CDataDisplayConsoleVariables ,  StandPipePressureDataDisplay=>StandPipePressure
        !use CManifolds
        use CDrillWatchVariables
        !use CHOKEVARIABLES
        !use CChokeManifoldVariables
        !use CTanksVariables, TripTankVolume2 => DrillingWatch%TripTankVolume, TripTankDensity2 => TripTankDensity
        USE sROP_Other_Variables
        USE sROP_Variables
        use KickVARIABLESModule
        use PressureDisplayVARIABLESModule
        Use CError
        Use , intrinsic :: IEEE_Arithmetic
        
   
   implicit none
   
   integer i,ii,error_occured
   
   error_occured = 0
   

   
   
       !write(*,*) 'begining chokeline=='
        !write(*,*) 'Ann last:', Ann_MudDischarged_Volume%Last(), Ann_Density%Last() ,Ann_MudOrKick%Last()
        !
        !do imud=1, ChokeLine_MudDischarged_Volume%Length()
       !     write(*,*) 'ChokeLine:', imud, ChokeLine_MudDischarged_Volume%Array(imud), ChokeLine_Density%Array(imud) ,ChokeLine_MudOrKick%Array(imud)
        !enddo             
        
    
    
    !write(*,*) 'Ann_Kick_Saved_Volume_Final,MudSystem%MudVolume_InjectedFromAnn' , Ann_Kick_Saved_Volume_Final,MudSystem%MudVolume_InjectedFromAnn  
    
       !write(*,*) 'begining chokeline=='
   
   
   
   
   
   
   
        MudSystem%ChokeLineFlowRate = MUD(4)%Q
        !WRITE (*,*) 'MUD(4)%Q', MUD(4)%Q
   
   
        if (MudSystem%NewPipeFilling == 0) then   ! .or. UtubeFilling==0) then
            MudSystem%ChokeLineFlowRate= 0.
        endif  
        
        
        do imud=1, MudSystem%ChokeLine_MudDischarged_Volume%Length()-2
            if ( MudSystem%ChokeLine_MudOrKick%Array(imud) ==1 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+1) ==0 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+2) ==1 ) then
                write(*,*) 'error_location is 1'
                error_occured = 1
            endif          
        enddo             
        

        
        !
        !do imud=1, st_MudDischarged_Volume%Length()
        !    write(*,*) 'st:', imud, St_MudDischarged_Volume%Array(imud), St_Mud_Backhead_X%Array(imud) ,St_Mud_Forehead_X%Array(imud)
        !enddo 
        

 !========================CHOKE LINE ENTRANCE================= 

        !if ( Ann_Kick_Saved_Volume > 0.0 .and. ( Ann_Saved_MudDischarged_Volume-((Qlost/60.0d0)*DeltaT_Mudline) ) == 0.0 ) then 
        if ( MudSystem%Ann_Kick_Saved_Volume > 1.0e-5 .and. ( MudSystem%MudVolume_InjectedFromAnn ) <= 1.0e-5 ) then 
            
            !WRITE (*,*) 'only kick enters to chokeline, Casing pressure = ', PressureGauges(2)
            
                if (MudSystem%ChokeLine_MudOrKick%First() == 0) then
                    call MudSystem%ChokeLine_Density%AddToFirst (MudSystem%Ann_KickSaved_Density)
                    call MudSystem%ChokeLine_MudDischarged_Volume%AddToFirst (0.d0)
                    call MudSystem%ChokeLine_Mud_Forehead_X%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_Mud_Forehead_section%AddToFirst (1)
                    call MudSystem%ChokeLine_Mud_Backhead_X%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_Mud_Backhead_section%AddToFirst (1)
                    call MudSystem%ChokeLine_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_MudOrKick%AddToFirst (MudSystem%Saved_Ann_MudOrKick)
                    
                    MudSystem%ChokeLineDensity_Old= MudSystem%Ann_KickSaved_Density
                    
                endif
                
                    MudSystem%ChokeLine_MudDischarged_Volume%Array(1)= MudSystem%ChokeLine_MudDischarged_Volume%Array(1)+ MudSystem%Ann_Kick_Saved_Volume   !(gal)                    
         
        endif
        
        
        do imud=1, MudSystem%ChokeLine_MudDischarged_Volume%Length()-2
            if ( MudSystem%ChokeLine_MudOrKick%Array(imud) ==1 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+1) ==0 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+2) ==1 ) then
                write(*,*) 'error_location is 2'
                
                error_occured = 1
            
            endif          
        enddo          
        
        
        
        !if ( Ann_Kick_Saved_Volume == 0.0 .and. ( Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) ) > 0.0 ) then
        if ( MudSystem%Ann_Kick_Saved_Volume <= 1.0e-5 .and.  MudSystem%MudVolume_InjectedFromAnn > 1.0e-5 ) then
            
            !WRITE (*,*) 'only mud enters to chokeline'

                
             if ((MudSystem%Ann_to_Choke_2mud == .false. .and. ABS(MudSystem%ChokeLineDensity_Old - MudSystem%Ann_MudSaved_Density) >= MudSystem%DensityMixTol) .or. MudSystem%ChokeLine_MudOrKick%First() /= 0) then     ! new mud is pumped
                call MudSystem%ChokeLine_Density%AddToFirst (MudSystem%Ann_MudSaved_Density)
                call MudSystem%ChokeLine_MudDischarged_Volume%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_Mud_Forehead_X%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_Mud_Forehead_section%AddToFirst (1)
                call MudSystem%ChokeLine_Mud_Backhead_X%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_Mud_Backhead_section%AddToFirst (1)
                call MudSystem%ChokeLine_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_MudOrKick%AddToFirst (0)
             
                 MudSystem%ChokeLineDensity_Old= MudSystem%Ann_MudSaved_Density
             endif

                    !ChokeLine_MudDischarged_Volume%Array(1)= ChokeLine_MudDischarged_Volume%Array(1)+ (Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) )   !(gal) 
                    MudSystem%ChokeLine_MudDischarged_Volume%Array(1)= MudSystem%ChokeLine_MudDischarged_Volume%Array(1)+ (MudSystem%MudVolume_InjectedFromAnn)   !(gal)  
                    
                
                
        endif
        

        
        do imud=1, MudSystem%ChokeLine_MudDischarged_Volume%Length()-2
            if ( MudSystem%ChokeLine_MudOrKick%Array(imud) ==1 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+1) ==0 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+2) ==1 ) then
                write(*,*) 'error_location is 3'
                error_occured = 1
                
            endif          
        enddo  
        
        
        !if ( Ann_Kick_Saved_Volume > 0.0 .and. (Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) ) > 0.0 .and. ChokeLine_MudOrKick%First() /= 0 ) then 
        if ( MudSystem%Ann_Kick_Saved_Volume > 1.0e-5 .and. (MudSystem%MudVolume_InjectedFromAnn) > 1.0e-5 .and. MudSystem%ChokeLine_MudOrKick%First() /= 0 ) then 
  
            WRITE (*,*) 'Kick Enters Choke line Last Time'

                    MudSystem%ChokeLine_MudDischarged_Volume%Array(1)= MudSystem%ChokeLine_MudDischarged_Volume%Array(1)+ MudSystem%Ann_Kick_Saved_Volume   !(gal)  
                    
                    
                    
                call MudSystem%ChokeLine_Density%AddToFirst (MudSystem%Ann_MudSaved_Density)
                !call ChokeLine_MudDischarged_Volume%AddToFirst (Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) )
                call MudSystem%ChokeLine_MudDischarged_Volume%AddToFirst (MudSystem%MudVolume_InjectedFromAnn)
                call MudSystem%ChokeLine_Mud_Forehead_X%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_Mud_Forehead_section%AddToFirst (1)
                call MudSystem%ChokeLine_Mud_Backhead_X%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_Mud_Backhead_section%AddToFirst (1)
                call MudSystem%ChokeLine_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
                call MudSystem%ChokeLine_MudOrKick%AddToFirst (0)
             
                 MudSystem%ChokeLineDensity_Old= MudSystem%Ann_MudSaved_Density

                                    
                    
                        
                
        !ELSE if ( Ann_Kick_Saved_Volume > 0.0 .and. ( Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) ) > 0.0 .and. ChokeLine_MudOrKick%First() == 0 ) then 
        ELSE if ( MudSystem%Ann_Kick_Saved_Volume > 1.0e-5 .and. ( MudSystem%MudVolume_InjectedFromAnn ) > 1.0e-5 .and. MudSystem%ChokeLine_MudOrKick%First() == 0 ) then 
            WRITE (*,*) 'Kick Enters Choke line First Time'
            


                    !ChokeLine_MudDischarged_Volume%Array(1)= ChokeLine_MudDischarged_Volume%Array(1)+ ( Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) )   !(gal)              
                    MudSystem%ChokeLine_MudDischarged_Volume%Array(1)= MudSystem%ChokeLine_MudDischarged_Volume%Array(1)+ ( MudSystem%MudVolume_InjectedFromAnn )   !(gal)              


            
                    
                    call MudSystem%ChokeLine_Density%AddToFirst (MudSystem%Ann_KickSaved_Density)
                    call MudSystem%ChokeLine_MudDischarged_Volume%AddToFirst (MudSystem%Ann_Kick_Saved_Volume)
                    call MudSystem%ChokeLine_Mud_Forehead_X%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_Mud_Forehead_section%AddToFirst (1)
                    call MudSystem%ChokeLine_Mud_Backhead_X%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_Mud_Backhead_section%AddToFirst (1)
                    call MudSystem%ChokeLine_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
                    call MudSystem%ChokeLine_MudOrKick%AddToFirst (MudSystem%Saved_Ann_MudOrKick)
                    
                    MudSystem%ChokeLineDensity_Old= MudSystem%Ann_KickSaved_Density

                
        endif                  
                
        do imud=1, MudSystem%ChokeLine_MudDischarged_Volume%Length()-2
            if ( MudSystem%ChokeLine_MudOrKick%Array(imud) ==1 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+1) ==0 .and. MudSystem%ChokeLine_MudOrKick%Array(imud+2) ==1 ) then
                write(*,*) 'error_location is 4'
                error_occured = 1
          
            endif          
        enddo  
        
        if (error_occured == 1) then
        
                do imud=1, MudSystem%ChokeLine_MudDischarged_Volume%Length()
                    write(*,*) 'ChokeLine:', imud,  MudSystem%ChokeLine_Density%Array(imud) ,MudSystem%ChokeLine_MudOrKick%Array(imud)
                enddo    
                
        endif
        
        
!==========================================================      
        
       !
       !write(*,*) 'after add chokeline=='
       ! 
       ! do imud=1, ChokeLine_MudDischarged_Volume%Length()
       !     write(*,*) 'ChokeLine:', imud, ChokeLine_MudDischarged_Volume%Array(imud), ChokeLine_Density%Array(imud) ,ChokeLine_MudOrKick%Array(imud)
       ! enddo             
       !     
       !write(*,*) 'after add chokeline=='        
       ! 
       ! 
        
        
!=============== save Choke Mud data==========================
    MudSystem%ChokeMudVolumeSum= 0.d0
    !Ann_MudSaved_Density= 0.d0
    !Ann_KickSaved_Density= 0.d0
    MudSystem%Choke_Saved_MudDischarged_Volume= 0.d0
    MudSystem%Choke_Kick_Saved_Volume= 0.d0
    MudSystem%Saved_Choke_MudOrKick= 0
    
    
    
    
    do imud=1, MudSystem%ChokeLine_MudDischarged_Volume%Length()
        
            MudSystem%ChokeMudVolumeSum= MudSystem%ChokeMudVolumeSum + MudSystem%ChokeLine_MudDischarged_Volume%Array(imud)
        
        if ( MudSystem%ChokeMudVolumeSum > MudSystem%ChokeLine_VolumeCapacity ) then
            
            IF (MudSystem%ChokeLine_MudOrKick%Array(imud) == 0) THEN
                MudSystem%Choke_MudSaved_Density = MudSystem%ChokeLine_Density%Array(imud)
                MudSystem%Choke_Saved_MudDischarged_Volume = MudSystem%ChokeMudVolumeSum - MudSystem%ChokeLine_VolumeCapacity
            ELSEIF (MudSystem%ChokeLine_MudOrKick%Array(imud) > 0 .AND. MudSystem%ChokeLine_MudOrKick%Array(imud) <100) THEN        ! 104= AIR
                MudSystem%Choke_Kick_Saved_Volume = MudSystem%ChokeMudVolumeSum - MudSystem%ChokeLine_VolumeCapacity
                MudSystem%Saved_Choke_MudOrKick= MudSystem%ChokeLine_MudOrKick%Array (imud)
                MudSystem%Choke_KickSaved_Density= MudSystem%ChokeLine_Density%Array(imud)
            END IF
            
            do ii= imud + 1, MudSystem%ChokeLine_MudDischarged_Volume%Length()
                
                IF (MudSystem%ChokeLine_MudOrKick%Array(ii) == 0) THEN
                    MudSystem%Choke_MudSaved_Density = ((MudSystem%Choke_MudSaved_Density * MudSystem%Choke_Saved_MudDischarged_Volume) + (MudSystem%ChokeLine_Density%Array(ii) * MudSystem%ChokeLine_MudDischarged_Volume%Array(ii))) / (MudSystem%Choke_Saved_MudDischarged_Volume + MudSystem%ChokeLine_MudDischarged_Volume%Array(ii))
                    MudSystem%Choke_Saved_MudDischarged_Volume = MudSystem%Choke_Saved_MudDischarged_Volume + MudSystem%ChokeLine_MudDischarged_Volume%Array(ii)
                ELSEIF (MudSystem%ChokeLine_MudOrKick%Array(ii) > 0 .AND. MudSystem%ChokeLine_MudOrKick%Array(ii) <100) THEN        ! 104= AIR
                    MudSystem%Choke_Kick_Saved_Volume = MudSystem%Choke_Kick_Saved_Volume + MudSystem%ChokeLine_MudDischarged_Volume%Array(ii)
                    MudSystem%Saved_Choke_MudOrKick= MudSystem%ChokeLine_MudOrKick%Array (ii)
                    MudSystem%Choke_KickSaved_Density= MudSystem%ChokeLine_Density%Array(ii)
                END IF
            enddo
            
            
            !WRITE (*,*) 'Choke_Saved_Mud_Volume, Choke_Kick_Saved_Volume', Choke_Saved_MudDischarged_Volume, Choke_Kick_Saved_Volume
            exit ! exits do
            
        endif
        
    enddo
MudSystem%Choke_Saved_MudDischarged_Volume_Final= MudSystem%Choke_Saved_MudDischarged_Volume !+ Choke_Kick_Saved_Volume
MudSystem%Choke_Kick_Saved_Volume_Final= MudSystem%Choke_Kick_Saved_Volume
!======================================================================       
        

        !
        !do imud=1, ChokeLine_MudDischarged_Volume%Length()
        !    write(*,*) 'a)ChokeLine:', imud, ChokeLine_MudDischarged_Volume%Array(imud) ,ChokeLine_MudOrKick%Array(imud)
        !enddo 


        !write(*,*)  'choke_Mud sum=' , sum(ChokeLine_MudDischarged_Volume%Array(:)) 
        !write(*,*)  'choke_cap=' , ChokeLine_VolumeCapacity
        !write(*,*)  'Choke_Saved_Mud=' , Choke_Saved_MudDischarged_Volume_Final
        !write(*,*)  'Choke_Saved_Kick=' , Choke_Kick_Saved_Volume_Final
        

      
!========================Choke Line================= 
         
imud=0  
    do while (imud < MudSystem%ChokeLine_Mud_Forehead_X%Length())
        imud = imud + 1        
        
            if (imud> 1) then
                MudSystem%ChokeLine_Mud_Backhead_X%Array(imud)= MudSystem%ChokeLine_Mud_Forehead_X%Array(imud-1)
                MudSystem%ChokeLine_Mud_Backhead_section%Array(imud)= MudSystem%ChokeLine_Mud_Forehead_section%Array(imud-1)
            endif
            
                
            !DirectionCoef= (Xend_PipeSection(St_Mud_Backhead_section%Array(imud))-Xstart_PipeSection(St_Mud_Backhead_section%Array(imud))) &
            !    / ABS(Xend_PipeSection(St_Mud_Backhead_section%Array(imud))-Xstart_PipeSection(St_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)= (BopStackSpecification%ChokeLineLength- MudSystem%ChokeLine_Mud_Backhead_X%Array(imud))* MudSystem%Area_ChokeLineFt !(ft^3) 
            
            MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0       ! ft^3  to gal
            
            if ( MudSystem%ChokeLine_MudDischarged_Volume%Array(imud) <= MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)) then
                MudSystem%ChokeLine_Mud_Forehead_section%Array(imud)= MudSystem%ChokeLine_Mud_Backhead_section%Array(imud)
                MudSystem%ChokeLine_Mud_Forehead_X%Array(imud)= MudSystem%ChokeLine_Mud_Backhead_X%Array(imud)+ (MudSystem%ChokeLine_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_ChokeLineFt
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                MudSystem%isection= MudSystem%ChokeLine_Mud_Backhead_section%Array(imud)+1
                MudSystem%ChokeLine_RemainedVolume_in_LastSection%Array(imud)= MudSystem%ChokeLine_MudDischarged_Volume%Array(imud)- MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (MudSystem%isection > 1) then        ! last pipe section(Chokeline exit) 
                            MudSystem%ChokeLine_MudDischarged_Volume%Array(imud)= MudSystem%ChokeLine_MudDischarged_Volume%Array(imud)- MudSystem%ChokeLine_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%ChokeLine_Mud_Forehead_X%Array(imud)= BopStackSpecification%ChokeLineLength
                            MudSystem%ChokeLine_Mud_Forehead_section%Array(imud)= 1
                            if (MudSystem%ChokeLine_MudDischarged_Volume%Array(imud)<= 0.0d0)  then       ! imud is completely exited form the string
                                call MudSystem%ChokeLine_MudDischarged_Volume%Remove (imud)
                                call MudSystem%ChokeLine_Mud_Backhead_X%Remove (imud)
                                call MudSystem%ChokeLine_Mud_Backhead_section%Remove (imud)
                                call MudSystem%ChokeLine_Mud_Forehead_X%Remove (imud)
                                call MudSystem%ChokeLine_Mud_Forehead_section%Remove (imud)
                                call MudSystem%ChokeLine_Density%Remove (imud)
                                call MudSystem%ChokeLine_RemainedVolume_in_LastSection%Remove (imud)
                                call MudSystem%ChokeLine_EmptyVolume_inBackheadLocation%Remove (imud)
                                call MudSystem%ChokeLine_MudOrKick%Remove (imud)
                                
                            endif
                            exit
                        endif
                                 
                    MudSystem%xx= MudSystem%ChokeLine_RemainedVolume_in_LastSection%Array(imud)/ MudSystem%ChokeLine_VolumeCapacity   !(gal)
                        
                    if (MudSystem%xx<= 1.0) then
                        MudSystem%ChokeLine_Mud_Forehead_section%Array(imud)= MudSystem%isection
                        MudSystem%ChokeLine_Mud_Forehead_X%Array(imud)= MudSystem%xx * BopStackSpecification%ChokeLineLength
                        exit
                    else
                        MudSystem%ChokeLine_RemainedVolume_in_LastSection%Array(imud)= MudSystem%ChokeLine_RemainedVolume_in_LastSection%Array(imud)- MudSystem%ChokeLine_VolumeCapacity
                        MudSystem%isection= MudSystem%isection+ 1
                        
                                
                    endif

                enddo
            
            endif   

    enddo
!========================Choke Line END=================
    
        !do imud=1, ChokeLine_MudDischarged_Volume%Length()
        !    write(*,*) 'b)ChokeLine:', imud, ChokeLine_MudDischarged_Volume%Array(imud) ,ChokeLine_MudOrKick%Array(imud)
        !enddo 
    
    MudSystem%ChokeOutletDensity= MudSystem%ChokeLine_Density%Last()    ! used in MudSystem
    
    

    
 
        do i=1, MudSystem%ChokeLine_MudOrKick%Length()
            !write(*,555) i,'Choke_Volume(i), type=' ,ChokeLine_MudDischarged_Volume%Array(i),ChokeLine_MudOrKick%Array(i)
        
            IF (IEEE_Is_NaN(MudSystem%ChokeLine_MudDischarged_Volume%Array(i)))      call ErrorStop('NaN in Choke Volume-Plot')
            IF (MudSystem%ChokeLine_MudDischarged_Volume%Array(i)<=0.)      call ErrorStop('Choke Volume= <=0' , MudSystem%ChokeLine_MudDischarged_Volume%Array(i))
        enddo     
    
555     FORMAT(I3,5X,A42,(f12.5),5X,I3)         
    
    
      !write(*,*) 'after sorting chokeline=='
        !IF (ANY(ChokeLine_MudOrKick%Array(:) > 0)) THEN
        !    do imud=1, ChokeLine_MudDischarged_Volume%Length()
        !        write(*,*) 'ChokeLine:', imud, ChokeLine_MudDischarged_Volume%Array(imud), ChokeLine_Density%Array(imud) ,ChokeLine_MudOrKick%Array(imud)
        !    enddo
        !END IF
        
        
        !do imud=1, Ann_MudDischarged_Volume%Length()
        !    write(*,*) 'Ann:', imud, Ann_MudDischarged_Volume%Array(imud), Ann_Density%Array(imud) ,Ann_MudOrKick%Array(imud)
        !enddo
        !
        !write(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
        ! write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))    
        
    
    !write(*,*) '==after sorting chokeline'
    
      
    end subroutine ChokeLineMud
    
 
    
    
    
subroutine Choke_GasSound    !  is called in subroutine CirculationCodeSelect  


use CSounds
        !Use GeoElements_FluidModule
        !USE CMudPropertiesVariables
        USE MudSystemVARIABLES
        !USE Pumps_VARIABLES
        !!USE CHOKEVARIABLES
        !!USE CDataDisplayConsoleVariables ,  StandPipePressureDataDisplay=>StandPipePressure
        !!use CManifolds
        !use CDrillWatchVariables
        !!use CHOKEVARIABLES
        !!use CChokeManifoldVariables
        !use CTanksVariables, TripTankVolume2 => TripTankVolume, TripTankDensity2 => TripTankDensity
        !USE sROP_Other_Variables
        !USE sROP_Variables
        !use KickVARIABLESModule
        !use PressureDisplayVARIABLESModule
        !Use CError
        !Use , intrinsic :: IEEE_Arithmetic



    
    
    if ( MudSystem%ChokeLine_MudOrKick%Last() > 0 .AND. MudSystem%WellToChokeManifoldOpen == .true.) then
        !WellToChokeManifoldWasOpen
        
        MudSystem%SoundGasThroughChoke = 100  !100:chon dar adadhaye kamtar az 100 seda ghaat mishavad. eslah shavad.5.8.98  !int (min(ChokeLineFlowRate/2. , 100.))
        print* , 'SoundGasThroughChoke1=', MudSystem%SoundGasThroughChoke
        !WRITE (*,*) 'WellToChokeManifoldWasOpen-Sound', WellToChokeManifoldWasOpen
        WRITE (*,*) 'WellToChokeManifoldOpen', MudSystem%WellToChokeManifoldOpen
    else
        MudSystem%SoundGasThroughChoke = 0
        print* , 'SoundGasThroughChoke2=', MudSystem%SoundGasThroughChoke
    endif
    !print* , 'SoundGasThroughChoke3=', SoundGasThroughChoke
    

    
    call SetSoundGasThroughChoke(MudSystem%SoundGasThroughChoke)
    
    
    end subroutine Choke_GasSound