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 Pump_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 KickVariables
        Use CShoeVariables

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

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

        
            !write(*,*) 'Trip In'
  

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

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

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

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

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

                enddo
            
            endif   
        
    enddo
!========================Horizontal PIPE END=================         
            
        
!========================Utube1 Air Element Removing=================         
    
        !if (UtubeMode1Activated== .true.) then      ! StringUpdate == .true.
        !
        !
        !    !StringDensity_Old= 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 (AddedElementsToString > 0) then      ! StringUpdate == .true.
            
            !NoPipeAdded= F_StringIntervalCounts - F_StringIntervalCountsOld

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

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

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

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

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

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

    do imud=1, St_MudDischarged_Volume%Length()
        
            StMudVolumeSum = StMudVolumeSum + St_MudDischarged_Volume%Array(imud)
        
        if ( StMudVolumeSum > sum(PipeSection_VolumeCapacity(2:F_StringIntervalCounts)) ) then
            
            !IF (St_MudOrKick%Array(imud) == 0) THEN
                St_MudSaved_Density = St_Density%Array(imud)
                St_Saved_MudDischarged_Volume = StMudVolumeSum - sum(PipeSection_VolumeCapacity(2:F_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= St_Density%Array(imud)
            !END IF
            
            do ii= imud + 1, St_MudDischarged_Volume%Length()
                !IF (St_MudOrKick%Array(ii) == 0) THEN
                    St_MudSaved_Density = ((St_MudSaved_Density * St_Saved_MudDischarged_Volume) + (St_Density%Array(ii) * St_MudDischarged_Volume%Array(ii))) / (St_Saved_MudDischarged_Volume + St_MudDischarged_Volume%Array(ii))
                    St_Saved_MudDischarged_Volume = St_Saved_MudDischarged_Volume + 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= 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
St_Saved_MudDischarged_Volume_Final = St_Saved_MudDischarged_Volume

IF (WellHeadIsOpen)     MudVolume_InjectedToBH = St_Saved_MudDischarged_Volume_Final
!======================================================================                
                
!========================STRING================= 
                      
imud=0  
    do while (imud < St_Mud_Forehead_X%Length())
        imud = imud + 1        
        
            if (imud> 1) then
                St_Mud_Backhead_X%Array(imud)= St_Mud_Forehead_X%Array(imud-1)
                St_Mud_Backhead_section%Array(imud)= St_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
                
                                                                                                                    
            St_EmptyVolume_inBackheadLocation%Array(imud)= DirectionCoef* (Xend_PipeSection(St_Mud_Backhead_section%Array(imud))- St_Mud_Backhead_X%Array(imud))* &
                Area_PipeSectionFt(St_Mud_Backhead_section%Array(imud)) !(ft^3)          
            St_EmptyVolume_inBackheadLocation%Array(imud)= 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 ( St_MudDischarged_Volume%Array(imud) <= St_EmptyVolume_inBackheadLocation%Array(imud)) then
                St_Mud_Forehead_section%Array(imud)= St_Mud_Backhead_section%Array(imud)
                St_Mud_Forehead_X%Array(imud)= St_Mud_Backhead_X%Array(imud)+ DirectionCoef*(St_MudDischarged_Volume%Array(imud)/7.48051948d0)/Area_PipeSectionFt(St_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                isection= St_Mud_Backhead_section%Array(imud)+1
                St_RemainedVolume_in_LastSection%Array(imud)= St_MudDischarged_Volume%Array(imud)- St_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (isection > F_StringIntervalCounts) then        ! last pipe section(string exit) F_StringIntervalCounts includes Horizontal line
                            St_MudDischarged_Volume%Array(imud)= St_MudDischarged_Volume%Array(imud)- St_RemainedVolume_in_LastSection%Array(imud)
                            St_Mud_Forehead_X%Array(imud)= Xend_PipeSection(F_StringIntervalCounts)
                            St_Mud_Forehead_section%Array(imud)= F_StringIntervalCounts
                            
                            if (St_MudDischarged_Volume%Array(imud)<= 0.0d0)  then     ! imud is completely exited form the string
                                call RemoveStringMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    xx= St_RemainedVolume_in_LastSection%Array(imud)/ PipeSection_VolumeCapacity(isection)   !(gal)
                        
                    if (xx<= 1.0) then
                        St_Mud_Forehead_section%Array(imud)= isection
                        St_Mud_Forehead_X%Array(imud)= (xx * (Xend_PipeSection(isection)- Xstart_PipeSection(isection)))+ Xstart_PipeSection(isection)
                        exit
                    else
                        St_RemainedVolume_in_LastSection%Array(imud)= St_RemainedVolume_in_LastSection%Array(imud)- PipeSection_VolumeCapacity(isection)
                        isection= 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 (Op_MudOrKick%Last() /= 0 .and. Op_MudOrKick%Last()==Ann_MudOrKick%First())  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 ( AnnulusFlowRate>0.0 ) then 
        if ( MudVolume_InjectedToBH > 0.0 ) then 
            
            
                if (KickOffBottom) then                         ! (kickOffBottom = F) means kick is next to the bottom hole and usually kick is entering the
                    AddLocation= Op_Density%Length()-iloc+1+1    ! well, thus pumped mud should be placed above the kick
                else
                    AddLocation= Op_Density%Length()+1
                endif
 !write(*,*) 'AddLocation====' , AddLocation
                if ( AddLocation== 0)      CALL ErrorStop ('AddLocation=0')
 
                
                if ( ABS(St_Density%Last() - Op_Density%Array(AddLocation-1)) >= DensityMixTol ) then
                    !write(*,*) 'new pocket**'
                    !write(*,*) 'St_Density%Last()=' , St_Density%Last()
                    !write(*,*) 'Op_Density%Array(AddLocation-1)=' , Op_Density%Array(AddLocation-1)
                    

                    call Op_Density% AddTo (AddLocation,St_Density%Last())
                    !call Op_MudDischarged_Volume%AddTo (AddLocation,((AnnulusFlowRate/60.d0)*DeltaT_Mudline))
                    call Op_MudDischarged_Volume%AddTo (AddLocation,MudVolume_InjectedToBH)
                    call Op_Mud_Forehead_X%AddTo (AddLocation,Xstart_OpSection(1))
                    call Op_Mud_Forehead_section%AddTo (AddLocation,1)
                    call Op_Mud_Backhead_X%AddTo (AddLocation,Xstart_OpSection(1))
                    call Op_Mud_Backhead_section%AddTo (AddLocation,1)
                    call Op_RemainedVolume_in_LastSection%AddTo (AddLocation,0.0d0)
                    call Op_EmptyVolume_inBackheadLocation%AddTo (AddLocation,0.0d0)
                    call Op_MudOrKick%AddTo (AddLocation,0) 
                else
                    !write(*,*) 'merge**'
                    !write(*,*) 'density before=' , Op_Density%Array(AddLocation-1)
                    !write(*,*) 'St_Density%Last() for mix=' , St_Density%Last()
       
                    !Op_Density%Array(AddLocation-1)= (Op_Density%Array(AddLocation-1)*Op_MudDischarged_Volume%Array(AddLocation-1)+St_Density%Last()*((AnnulusFlowRate/60.d0)*DeltaT_Mudline))/(Op_MudDischarged_Volume%Array(AddLocation-1)+((AnnulusFlowRate/60.d0)*DeltaT_Mudline))
                    !Op_MudDischarged_Volume%Array(AddLocation-1)= Op_MudDischarged_Volume%Array(AddLocation-1) + ((AnnulusFlowRate/60.d0)*DeltaT_Mudline)
                    
                    Op_Density%Array(AddLocation-1)= (Op_Density%Array(AddLocation-1)*Op_MudDischarged_Volume%Array(AddLocation-1)+St_Density%Last()*MudVolume_InjectedToBH)/(Op_MudDischarged_Volume%Array(AddLocation-1)+MudVolume_InjectedToBH)
                    Op_MudDischarged_Volume%Array(AddLocation-1)= Op_MudDischarged_Volume%Array(AddLocation-1) + 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    
    OpMudVolumeSum= 0.d0
    !Op_MudSaved_Density= 0.d0
    !Op_KickSaved_Density= 0.d0
    Op_Saved_MudDischarged_Volume= 0.d0
    Op_Kick_Saved_Volume= 0.d0
    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, Op_MudDischarged_Volume%Length()
        !write(*,*) 'imud, Op_MudDischarged_Volume%Array(imud)=' , imud,Op_MudDischarged_Volume%Array(imud)
        
            OpMudVolumeSum= OpMudVolumeSum + Op_MudDischarged_Volume%Array(imud)
        
        if ( OpMudVolumeSum > sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) ) then
            
            IF (Op_MudOrKick%Array(imud) == 0) THEN
                Op_MudSaved_Density = Op_Density%Array(imud)
                Op_Saved_MudDischarged_Volume = OpMudVolumeSum - sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))
            ELSE
                Op_Kick_Saved_Volume = OpMudVolumeSum - sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))
                !write(*,*) 'cond 1- Op_MudOrKick%Array (imud),Op_Density%Array(imud):' ,Op_MudOrKick%Array (imud),Op_Density%Array(imud)
                Saved_Op_MudOrKick= Op_MudOrKick%Array (imud)
                Op_KickSaved_Density= Op_Density%Array(imud)
                iloc= 2
            END IF
            
            do ii= imud + 1, Op_MudDischarged_Volume%Length()
                IF (Op_MudOrKick%Array(ii) == 0) THEN
                    Op_MudSaved_Density = ((Op_MudSaved_Density * Op_Saved_MudDischarged_Volume) + (Op_Density%Array(ii) * Op_MudDischarged_Volume%Array(ii))) / (Op_Saved_MudDischarged_Volume + Op_MudDischarged_Volume%Array(ii))
                    Op_Saved_MudDischarged_Volume = Op_Saved_MudDischarged_Volume + Op_MudDischarged_Volume%Array(ii)
                ELSE
                    Op_Kick_Saved_Volume = Op_Kick_Saved_Volume + Op_MudDischarged_Volume%Array(ii)
                !write(*,*) 'cond 2- Op_MudOrKick%Array (ii),Op_Density%Array(ii):' ,Op_MudOrKick%Array (ii),Op_Density%Array(ii)
                    Saved_Op_MudOrKick= Op_MudOrKick%Array (ii)
                    Op_KickSaved_Density= Op_Density%Array(ii)
                    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
        MudSection= F_StringIntervalCounts+1
        BackheadX= Xstart_PipeSection(F_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 Rate_of_Penetration ==0.   in bude:   DeltaVolumeOp == 0.0
    !    if (ABS(AnnulusSuctionDensity_Old-St_Density%Last()) >= DensityMixTol  .OR. (DeltaVolumeOp == 0.0 .and. ABS(Ann_Density%Array(iLoc)-St_Density%Last())>=DensityMixTol .and. AnnulusFlowRate/=0.0d0) ) then ! new mud is pumped
    !    call Ann_Density%AddTo (iLoc,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= St_Density%Last()
    !        
    !    MudIsChanged= .true.
    !    endif  
    !
    !            Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+ ((AnnulusFlowRate/60.d0)*DeltaT_Mudline)    !(gal)
    !
    !endif
    


        
            
        
         Ann_Mud_Backhead_section%Array(1)= MudSection !it is needed to be updated for a condition that one pipe is removed from Annulus due to trip out
         Ann_Mud_Backhead_X%Array(1)= 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 (Rate_of_Penetration==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 (Op_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() == 0) then
                    write(*,*) 'Kick influx enters Annulus'
                    call Ann_Density%AddToFirst (Op_KickSaved_Density)
                    call Ann_MudDischarged_Volume%AddToFirst (Op_Kick_Saved_Volume)
                    call Ann_Mud_Forehead_X%AddToFirst (Xstart_PipeSection(F_StringIntervalCounts+1))
                    call Ann_Mud_Forehead_section%AddToFirst (F_StringIntervalCounts+1)
                    call Ann_Mud_Backhead_X%AddToFirst (Xstart_PipeSection(F_StringIntervalCounts+1))
                    call Ann_Mud_Backhead_section%AddToFirst (F_StringIntervalCounts+1)
                    call Ann_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call Ann_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0) 
                    call Ann_MudOrKick%AddToFirst (Saved_Op_MudOrKick)      !<<<<<<<<
                    call Ann_CuttingMud%AddToFirst (0)
                elseif (Op_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() /= 0) then
                    Ann_MudDischarged_Volume%Array(1)= Ann_MudDischarged_Volume%Array(1) + Op_Kick_Saved_Volume
                endif
                
                
            if (Op_Saved_MudDischarged_Volume> 0.0) then
                NewDensity= Op_MudSaved_Density
                NewVolume= Op_Saved_MudDischarged_Volume
                !write(*,*) 'NewVolume=' , NewVolume
                !write(*,*) 'iloc=' , iloc,'Ann_MudDischarged_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                

                
                if ((Rate_of_Penetration==0 .and. abs(Ann_Density%Array(iLoc)-NewDensity)< DensityMixTol) &
                .or. (Rate_of_Penetration>0. .and. Ann_CuttingMud%Array(iLoc)==1 .and. abs(Ann_Density%Array(iLoc)-NewDensity)< CuttingDensityMixTol) &
                .or. (Rate_of_Penetration>0. .and. Ann_CuttingMud%Array(iLoc)==0 .and. Ann_MudDischarged_Volume%Array(iLoc) < 42.) ) then   ! 1-Pockets are Merged
                 
                    Ann_Density%Array(iLoc)= (Ann_Density%Array(iLoc)*Ann_MudDischarged_Volume%Array(iLoc)+NewDensity*NewVolume)/(Ann_MudDischarged_Volume%Array(iLoc)+NewVolume)
                    Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+NewVolume
                    Ann_Mud_Forehead_X%Array(iLoc)= BackheadX
                    Ann_Mud_Forehead_section%Array(iLoc)= MudSection
                    Ann_Mud_Backhead_X%Array(iLoc)= BackheadX
                    Ann_Mud_Backhead_section%Array(iLoc)= MudSection
                    Ann_RemainedVolume_in_LastSection%Array(iLoc)= (0.0d0)
                    Ann_EmptyVolume_inBackheadLocation%Array(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 Ann_Density%AddTo (iLoc,NewDensity)
                    call Ann_MudDischarged_Volume%AddTo (iLoc,NewVolume)
                    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(*,*) '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 (Rate_of_Penetration>0. .and. 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)
                
                
                !NewDensity= (St_Density%Last() * AnnulusFlowRate + 141.4296E-4*Rate_of_Penetration*Diameter_of_Bit**2)/(AnnulusFlowRate+6.7995E-4*Rate_of_Penetration*Diameter_of_Bit**2)
                
                NewDensity= St_Density%Last()
                
                
                !NewVolume= ((AnnulusFlowRate/60.0d0)*DeltaT_Mudline)+DeltaVolumeOp
                !!! Density in ppg, flow rate in gpm, ROP in ft/s, bit diameter in inch         

                
                do imud=1, Op_MudDischarged_Volume%Length()
                    if ( Op_MudOrKick%Array(imud) == 0 ) then
                        Op_Density%Array(imud)= NewDensity
                        
                    endif
                enddo
                
                
                
                if (Op_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() == 0) then
                    write(*,*) 'Kick influx enters Annulus first time'
                    !write(*,*) 'Saved_Op_MudOrKick=',Saved_Op_MudOrKick
                    call Ann_Density%AddToFirst (Op_KickSaved_Density)
                    call Ann_MudDischarged_Volume%AddToFirst (Op_Kick_Saved_Volume)
                    call Ann_Mud_Forehead_X%AddToFirst (Xstart_PipeSection(F_StringIntervalCounts+1))
                    call Ann_Mud_Forehead_section%AddToFirst (F_StringIntervalCounts+1)
                    call Ann_Mud_Backhead_X%AddToFirst (Xstart_PipeSection(F_StringIntervalCounts+1))
                    call Ann_Mud_Backhead_section%AddToFirst (F_StringIntervalCounts+1)
                    call Ann_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call Ann_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0) 
                    call Ann_MudOrKick%AddToFirst (Saved_Op_MudOrKick)      !<<<<<<<<
                    call Ann_CuttingMud%AddToFirst (0)
                elseif (Op_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() /= 0) then
                    Ann_MudDischarged_Volume%Array(1)= Ann_MudDischarged_Volume%Array(1) + Op_Kick_Saved_Volume
                endif
                
                
            if (Op_Saved_MudDischarged_Volume> 0.0) then
                !write(*,*) 'Op_Saved_Mud added'
                NewDensity= NewDensity  !(drilling density)
                NewVolume= Op_Saved_MudDischarged_Volume + DeltaVolumeOp        ! (DeltaVolumeOp: for Cuttings Volume)
                !write(*,*) 'NewVolume=' , NewVolume
                !write(*,*) 'iloc=' , iloc,'Ann_MudDischarged_Volume%Array(1)=' , Ann_MudDischarged_Volume%Array(1)
                
                 if ( (Ann_CuttingMud%Array(iloc)==1 .and. abs(Ann_Density%Array(iLoc)-NewDensity)< CuttingDensityMixTol ) &  
                    .or. (Ann_CuttingMud%Array(iLoc)==0 .and. Ann_MudDischarged_Volume%Array(iLoc) < 42.) ) then   ! 1-Pockets are Merged
                                  
                     Ann_Density%Array(iLoc)= (Ann_Density%Array(iLoc)*Ann_MudDischarged_Volume%Array(iLoc)+NewDensity*NewVolume)/(Ann_MudDischarged_Volume%Array(iLoc)+NewVolume)
                     Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+NewVolume
                     Ann_Mud_Forehead_X%Array(iLoc)= BackheadX
                     Ann_Mud_Forehead_section%Array(iLoc)= MudSection
                     Ann_Mud_Backhead_X%Array(iLoc)= BackheadX
                     Ann_Mud_Backhead_section%Array(iLoc)= MudSection
                     Ann_RemainedVolume_in_LastSection%Array(iLoc)= (0.0d0)
                     Ann_EmptyVolume_inBackheadLocation%Array(iLoc)= (0.0d0) 
                     Ann_CuttingMud%Array(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),NewDensity
                    !write(*,*) 'before e) Ann_MudDischarged_Volume%Array(iLoc)=' , Ann_MudDischarged_Volume%Array(iLoc)
                
                 
                    call Ann_Density%AddTo (iLoc,NewDensity)
                    call Ann_MudDischarged_Volume%AddTo (iLoc,NewVolume)
                    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,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'  
        
                    NewVolume= ((AnnulusFlowRate/60.d0)*DeltaT_Mudline) - Op_Saved_MudDischarged_Volume

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

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

                        ! including  a little expand
                    endif

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

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

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

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

            
!       <<< Fracture Shoe Lost            
            IF ( ShoeLost .and. ShoeDepth < Ann_Mud_Backhead_X%Array(imud) .and. ShoeDepth >= Ann_Mud_Forehead_X%Array(imud) ) then
                !write(*,*) 'ShoeLost   imud,AnnVolume(imud), VolumeLost:' , imud,Ann_MudDischarged_Volume%Array(imud), (( Qlost/60.0d0)*DeltaT_Mudline)
                Ann_MudDischarged_Volume%Array(imud)= Ann_MudDischarged_Volume%Array(imud)-((Qlost/60.0d0)*DeltaT_Mudline)    !(gal)
                if (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 >>>        
            
            
            DirectionCoef= (Xend_PipeSection(Ann_Mud_Backhead_section%Array(imud))-Xstart_PipeSection(Ann_Mud_Backhead_section%Array(imud))) &
                / ABS(Xend_PipeSection(Ann_Mud_Backhead_section%Array(imud))-Xstart_PipeSection(Ann_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            Ann_EmptyVolume_inBackheadLocation%Array(imud)= DirectionCoef* (Xend_PipeSection(Ann_Mud_Backhead_section%Array(imud))- Ann_Mud_Backhead_X%Array(imud))* &
                Area_PipeSectionFt(Ann_Mud_Backhead_section%Array(imud)) !(ft^3)          
            Ann_EmptyVolume_inBackheadLocation%Array(imud)= Ann_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal
            
         
            if ( Ann_MudDischarged_Volume%Array(imud) <= Ann_EmptyVolume_inBackheadLocation%Array(imud)) then
                Ann_Mud_Forehead_section%Array(imud)= Ann_Mud_Backhead_section%Array(imud)
                Ann_Mud_Forehead_X%Array(imud)= Ann_Mud_Backhead_X%Array(imud)+ DirectionCoef*(Ann_MudDischarged_Volume%Array(imud)/7.48051948d0)/Area_PipeSectionFt(Ann_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                isection= Ann_Mud_Backhead_section%Array(imud)+1
                Ann_RemainedVolume_in_LastSection%Array(imud)= Ann_MudDischarged_Volume%Array(imud)- Ann_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (isection > NoPipeSections) then        ! last pipe section(well exit)
                            Ann_MudDischarged_Volume%Array(imud)= Ann_MudDischarged_Volume%Array(imud)- Ann_RemainedVolume_in_LastSection%Array(imud)
                            Ann_Mud_Forehead_X%Array(imud)= Xend_PipeSection(NoPipeSections)
                            Ann_Mud_Forehead_section%Array(imud)= NoPipeSections
                                
                            if (Ann_MudDischarged_Volume%Array(imud)<= 0.0d0)  then      ! imud is completely exited form the well
                                !write(*,*) 'remove******'
                                call RemoveAnnulusMudArrays(imud)
                            endif
                            exit
                        endif
                                 
                    xx= Ann_RemainedVolume_in_LastSection%Array(imud)/ PipeSection_VolumeCapacity(isection)   !(gal)
                        
                    if (xx<= 1.0) then
                        Ann_Mud_Forehead_section%Array(imud)= isection
                        Ann_Mud_Forehead_X%Array(imud)= (xx * (Xend_PipeSection(isection)- Xstart_PipeSection(isection)))+ Xstart_PipeSection(isection)
                        exit
                    else
                        Ann_RemainedVolume_in_LastSection%Array(imud)= Ann_RemainedVolume_in_LastSection%Array(imud)- PipeSection_VolumeCapacity(isection)
                        isection= 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 (Ann_Mud_Forehead_X%Last() < Xend_PipeSection(NoPipeSections)) then
                Ann_Mud_Forehead_X%Array(Ann_Mud_Forehead_X%Length()) = Xend_PipeSection(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 < Op_Mud_Forehead_X%Length())
        imud = imud + 1
        
            if (imud> 1) then
                Op_Mud_Backhead_X%Array(imud)= Op_Mud_Forehead_X%Array(imud-1)
                Op_Mud_Backhead_section%Array(imud)= Op_Mud_Forehead_section%Array(imud-1)
            endif
            !write(*,*) 'imud**=' , imud
            DirectionCoef= (Xend_OpSection(Op_Mud_Backhead_section%Array(imud))-Xstart_OpSection(Op_Mud_Backhead_section%Array(imud))) &
                / ABS(Xend_OpSection(Op_Mud_Backhead_section%Array(imud))-Xstart_OpSection(Op_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                                           
                                                                                                                    
            Op_EmptyVolume_inBackheadLocation%Array(imud)= DirectionCoef* (Xend_OpSection(Op_Mud_Backhead_section%Array(imud))- Op_Mud_Backhead_X%Array(imud))* &
                Area_OpSectionFt(Op_Mud_Backhead_section%Array(imud)) !(ft^3)          
            Op_EmptyVolume_inBackheadLocation%Array(imud)= Op_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal
                !write(*,*)  ' Op_EmptyVolume_inBackheadLocation%Array(1) =' , Op_EmptyVolume_inBackheadLocation%Array(1) 
                if ( Op_EmptyVolume_inBackheadLocation%Array(1) < 0.0)      CALL ErrorStop1 ('Negative Empty volume')
            
            if ( Op_MudDischarged_Volume%Array(imud) <= Op_EmptyVolume_inBackheadLocation%Array(imud)) then
                Op_Mud_Forehead_section%Array(imud)= Op_Mud_Backhead_section%Array(imud)
                Op_Mud_Forehead_X%Array(imud)= Op_Mud_Backhead_X%Array(imud)+ DirectionCoef*(Op_MudDischarged_Volume%Array(imud)/7.48051948d0)/Area_OpSectionFt(Op_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                
                    
                isection= Op_Mud_Backhead_section%Array(imud)+1
                Op_RemainedVolume_in_LastSection%Array(imud)= Op_MudDischarged_Volume%Array(imud)- Op_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (isection > F_BottomHoleIntervalCounts) then        ! last pipe section(well exit)
                            !if( imud==1) KickDeltaVinAnnulus= Op_RemainedVolume_in_LastSection%Array(imud)      ! Kick enters Annulus space
                            Op_MudDischarged_Volume%Array(imud)= Op_MudDischarged_Volume%Array(imud)- Op_RemainedVolume_in_LastSection%Array(imud)
                            Op_Mud_Forehead_X%Array(imud)= Xend_OpSection(F_BottomHoleIntervalCounts)
                            Op_Mud_Forehead_section%Array(imud)= F_BottomHoleIntervalCounts
                                
                            if (Op_MudDischarged_Volume%Array(imud)<= 0.0d0)  then        ! imud is completely exited form the well
                                call RemoveOpMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    xx= Op_RemainedVolume_in_LastSection%Array(imud)/ OpSection_VolumeCapacity(isection)   !(gal)
                        
                    if (xx<= 1.0) then
                        Op_Mud_Forehead_section%Array(imud)= isection
                        Op_Mud_Forehead_X%Array(imud)= (xx * (Xend_OpSection(isection)- Xstart_OpSection(isection)))+ Xstart_OpSection(isection)
                        exit
                    else
                        Op_RemainedVolume_in_LastSection%Array(imud)= Op_RemainedVolume_in_LastSection%Array(imud)- OpSection_VolumeCapacity(isection)
                        isection= isection+ 1
                        
                    endif

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

                
            enddo
            
            exit ! 
            
        endif       
       
       
       
       
        !if (Op_Mud_Forehead_X%Array(imud)== Xend_OpSection(F_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),St_Density%Array(imud)
    !    enddo  
    !
    !write(*,*) '==after sorting st'    
    
    
    
                       
    !write(*,*) '**Ann_Kick_Saved_Final,Mud_InjectedFromAnn' , Ann_Kick_Saved_Volume_Final,MudVolume_InjectedFromAnn              

    end subroutine Pump_and_TripIn
    
    

    
    
    
    
    
    
    
    
 subroutine ChokeLineMud    !  is called in subroutine CirculationCodeSelect
    
        Use GeoElements_FluidModule
        USE CMudPropertiesVariables
        USE MudSystemVARIABLES
        USE Pump_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 KickVariables
        USE PressureDisplayVARIABLES
        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,MudVolume_InjectedFromAnn' , Ann_Kick_Saved_Volume_Final,MudVolume_InjectedFromAnn  
    
       !write(*,*) 'begining chokeline=='
   
   
   
   
   
   
   
        ChokeLineFlowRate = MUD(4)%Q
        !WRITE (*,*) 'MUD(4)%Q', MUD(4)%Q
   
   
        if (NewPipeFilling == 0) then   ! .or. UtubeFilling==0) then
            ChokeLineFlowRate= 0.
        endif  
        
        
        do imud=1, ChokeLine_MudDischarged_Volume%Length()-2
            if ( ChokeLine_MudOrKick%Array(imud) ==1 .and. ChokeLine_MudOrKick%Array(imud+1) ==0 .and. 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 ( Ann_Kick_Saved_Volume > 1.0e-5 .and. ( MudVolume_InjectedFromAnn ) <= 1.0e-5 ) then 
            
            !WRITE (*,*) 'only kick enters to chokeline, Casing pressure = ', PressureGauges(2)
            
                if (ChokeLine_MudOrKick%First() == 0) then
                    call ChokeLine_Density%AddToFirst (Ann_KickSaved_Density)
                    call ChokeLine_MudDischarged_Volume%AddToFirst (0.d0)
                    call ChokeLine_Mud_Forehead_X%AddToFirst (0.0d0)
                    call ChokeLine_Mud_Forehead_section%AddToFirst (1)
                    call ChokeLine_Mud_Backhead_X%AddToFirst (0.0d0)
                    call ChokeLine_Mud_Backhead_section%AddToFirst (1)
                    call ChokeLine_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                    call ChokeLine_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
                    call ChokeLine_MudOrKick%AddToFirst (Saved_Ann_MudOrKick)
                    
                    ChokeLineDensity_Old= Ann_KickSaved_Density
                    
                endif
                
                    ChokeLine_MudDischarged_Volume%Array(1)= ChokeLine_MudDischarged_Volume%Array(1)+ Ann_Kick_Saved_Volume   !(gal)                    
         
        endif
        
        
        do imud=1, ChokeLine_MudDischarged_Volume%Length()-2
            if ( ChokeLine_MudOrKick%Array(imud) ==1 .and. ChokeLine_MudOrKick%Array(imud+1) ==0 .and. 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 ( Ann_Kick_Saved_Volume <= 1.0e-5 .and.  MudVolume_InjectedFromAnn > 1.0e-5 ) then
            
            !WRITE (*,*) 'only mud enters to chokeline'

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

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

        
        do imud=1, ChokeLine_MudDischarged_Volume%Length()-2
            if ( ChokeLine_MudOrKick%Array(imud) ==1 .and. ChokeLine_MudOrKick%Array(imud+1) ==0 .and. 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 ( Ann_Kick_Saved_Volume > 1.0e-5 .and. (MudVolume_InjectedFromAnn) > 1.0e-5 .and. ChokeLine_MudOrKick%First() /= 0 ) then 
  
            WRITE (*,*) 'Kick Enters Choke line Last Time'

                    ChokeLine_MudDischarged_Volume%Array(1)= ChokeLine_MudDischarged_Volume%Array(1)+ Ann_Kick_Saved_Volume   !(gal)  
                    
                    
                    
                call ChokeLine_Density%AddToFirst (Ann_MudSaved_Density)
                !call ChokeLine_MudDischarged_Volume%AddToFirst (Ann_Saved_MudDischarged_Volume - ((Qlost/60.0d0)*DeltaT_Mudline) )
                call ChokeLine_MudDischarged_Volume%AddToFirst (MudVolume_InjectedFromAnn)
                call ChokeLine_Mud_Forehead_X%AddToFirst (0.0d0)
                call ChokeLine_Mud_Forehead_section%AddToFirst (1)
                call ChokeLine_Mud_Backhead_X%AddToFirst (0.0d0)
                call ChokeLine_Mud_Backhead_section%AddToFirst (1)
                call ChokeLine_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
                call ChokeLine_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
                call ChokeLine_MudOrKick%AddToFirst (0)
             
                 ChokeLineDensity_Old= 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 ( Ann_Kick_Saved_Volume > 1.0e-5 .and. ( MudVolume_InjectedFromAnn ) > 1.0e-5 .and. 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)              
                    ChokeLine_MudDischarged_Volume%Array(1)= ChokeLine_MudDischarged_Volume%Array(1)+ ( MudVolume_InjectedFromAnn )   !(gal)              


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

                
        endif                  
                
        do imud=1, ChokeLine_MudDischarged_Volume%Length()-2
            if ( ChokeLine_MudOrKick%Array(imud) ==1 .and. ChokeLine_MudOrKick%Array(imud+1) ==0 .and. 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, ChokeLine_MudDischarged_Volume%Length()
                    write(*,*) 'ChokeLine:', imud,  ChokeLine_Density%Array(imud) ,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==========================
    ChokeMudVolumeSum= 0.d0
    !Ann_MudSaved_Density= 0.d0
    !Ann_KickSaved_Density= 0.d0
    Choke_Saved_MudDischarged_Volume= 0.d0
    Choke_Kick_Saved_Volume= 0.d0
    Saved_Choke_MudOrKick= 0
    
    
    
    
    do imud=1, ChokeLine_MudDischarged_Volume%Length()
        
            ChokeMudVolumeSum= ChokeMudVolumeSum + ChokeLine_MudDischarged_Volume%Array(imud)
        
        if ( ChokeMudVolumeSum > ChokeLine_VolumeCapacity ) then
            
            IF (ChokeLine_MudOrKick%Array(imud) == 0) THEN
                Choke_MudSaved_Density = ChokeLine_Density%Array(imud)
                Choke_Saved_MudDischarged_Volume = ChokeMudVolumeSum - ChokeLine_VolumeCapacity
            ELSEIF (ChokeLine_MudOrKick%Array(imud) > 0 .AND. ChokeLine_MudOrKick%Array(imud) <100) THEN        ! 104= AIR
                Choke_Kick_Saved_Volume = ChokeMudVolumeSum - ChokeLine_VolumeCapacity
                Saved_Choke_MudOrKick= ChokeLine_MudOrKick%Array (imud)
                Choke_KickSaved_Density= ChokeLine_Density%Array(imud)
            END IF
            
            do ii= imud + 1, ChokeLine_MudDischarged_Volume%Length()
                
                IF (ChokeLine_MudOrKick%Array(ii) == 0) THEN
                    Choke_MudSaved_Density = ((Choke_MudSaved_Density * Choke_Saved_MudDischarged_Volume) + (ChokeLine_Density%Array(ii) * ChokeLine_MudDischarged_Volume%Array(ii))) / (Choke_Saved_MudDischarged_Volume + ChokeLine_MudDischarged_Volume%Array(ii))
                    Choke_Saved_MudDischarged_Volume = Choke_Saved_MudDischarged_Volume + ChokeLine_MudDischarged_Volume%Array(ii)
                ELSEIF (ChokeLine_MudOrKick%Array(ii) > 0 .AND. ChokeLine_MudOrKick%Array(ii) <100) THEN        ! 104= AIR
                    Choke_Kick_Saved_Volume = Choke_Kick_Saved_Volume + ChokeLine_MudDischarged_Volume%Array(ii)
                    Saved_Choke_MudOrKick= ChokeLine_MudOrKick%Array (ii)
                    Choke_KickSaved_Density= 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
Choke_Saved_MudDischarged_Volume_Final= Choke_Saved_MudDischarged_Volume !+ Choke_Kick_Saved_Volume
Choke_Kick_Saved_Volume_Final= 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 < ChokeLine_Mud_Forehead_X%Length())
        imud = imud + 1        
        
            if (imud> 1) then
                ChokeLine_Mud_Backhead_X%Array(imud)= ChokeLine_Mud_Forehead_X%Array(imud-1)
                ChokeLine_Mud_Backhead_section%Array(imud)= 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
                
                                                                                                                    
            ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)= (ChokeLineLength- ChokeLine_Mud_Backhead_X%Array(imud))* Area_ChokeLineFt !(ft^3) 
            
            ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)= ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0       ! ft^3  to gal
            
            if ( ChokeLine_MudDischarged_Volume%Array(imud) <= ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)) then
                ChokeLine_Mud_Forehead_section%Array(imud)= ChokeLine_Mud_Backhead_section%Array(imud)
                ChokeLine_Mud_Forehead_X%Array(imud)= ChokeLine_Mud_Backhead_X%Array(imud)+ (ChokeLine_MudDischarged_Volume%Array(imud)/7.48051948d0)/Area_ChokeLineFt
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                isection= ChokeLine_Mud_Backhead_section%Array(imud)+1
                ChokeLine_RemainedVolume_in_LastSection%Array(imud)= ChokeLine_MudDischarged_Volume%Array(imud)- ChokeLine_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (isection > 1) then        ! last pipe section(Chokeline exit) 
                            ChokeLine_MudDischarged_Volume%Array(imud)= ChokeLine_MudDischarged_Volume%Array(imud)- ChokeLine_RemainedVolume_in_LastSection%Array(imud)
                            ChokeLine_Mud_Forehead_X%Array(imud)= ChokeLineLength
                            ChokeLine_Mud_Forehead_section%Array(imud)= 1
                            if (ChokeLine_MudDischarged_Volume%Array(imud)<= 0.0d0)  then       ! imud is completely exited form the string
                                call ChokeLine_MudDischarged_Volume%Remove (imud)
                                call ChokeLine_Mud_Backhead_X%Remove (imud)
                                call ChokeLine_Mud_Backhead_section%Remove (imud)
                                call ChokeLine_Mud_Forehead_X%Remove (imud)
                                call ChokeLine_Mud_Forehead_section%Remove (imud)
                                call ChokeLine_Density%Remove (imud)
                                call ChokeLine_RemainedVolume_in_LastSection%Remove (imud)
                                call ChokeLine_EmptyVolume_inBackheadLocation%Remove (imud)
                                call ChokeLine_MudOrKick%Remove (imud)
                                
                            endif
                            exit
                        endif
                                 
                    xx= ChokeLine_RemainedVolume_in_LastSection%Array(imud)/ ChokeLine_VolumeCapacity   !(gal)
                        
                    if (xx<= 1.0) then
                        ChokeLine_Mud_Forehead_section%Array(imud)= isection
                        ChokeLine_Mud_Forehead_X%Array(imud)= xx * ChokeLineLength
                        exit
                    else
                        ChokeLine_RemainedVolume_in_LastSection%Array(imud)= ChokeLine_RemainedVolume_in_LastSection%Array(imud)- ChokeLine_VolumeCapacity
                        isection= 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 
    
    ChokeOutletDensity= ChokeLine_Density%Last()    ! used in MudSystem
    
    

    
 
        do i=1, ChokeLine_MudOrKick%Length()
            !write(*,555) i,'Choke_Volume(i), type=' ,ChokeLine_MudDischarged_Volume%Array(i),ChokeLine_MudOrKick%Array(i)
        
            IF (IEEE_Is_NaN(ChokeLine_MudDischarged_Volume%Array(i)))      call ErrorStop('NaN in Choke Volume-Plot')
            IF (ChokeLine_MudDischarged_Volume%Array(i)<=0.)      call ErrorStop('Choke Volume= <=0' , 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 Pump_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 KickVariables
        !USE PressureDisplayVARIABLES
        !Use CError
        !Use , intrinsic :: IEEE_Arithmetic



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

    
    call SetSoundGasThroughChoke(SoundGasThroughChoke)
    
    
    end subroutine Choke_GasSound