SimulationCore2/Equipments/MudSystem/Trip_Out_andPump.f90

subroutine TripOut_and_Pump    !  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, iloc_edited, iloc_changedTo2
Real(8) ExcessMudVolume_Remained,SavedDensityForOp

!===========================================================WELL============================================================
!===========================================================WELL============================================================ 

        MudSystem%StringFlowRate= MUD(2)%Q
        MudSystem%AnnulusFlowRate= MUD(2)%Q
         !write(*,*) 'MUD(2)%Q=====' , MUD(2)%Q
        
 
            write(*,*) 'Trip Out'

    ! write(*,*) 'check point 1=='
    !    
    !      
    !    
    !    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(*,*) '==check point 1'         

!========================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)
        !    
        !    UtubeMode1Activated= .false.
        !endif
        
!========================Utube1 Air Element Removing=================    
          
          
!========================Utube2 Removing from Annulus=================         
    
        if (MudSystem%UtubeMode2Activated== .true.) then      ! StringUpdate == .true.
            MudSystem%TotalAddedVolume=0.
            
            if (MudSystem%Ann_MudOrKick%Last() == 104) then        !movaghati. albate age merge anjam shode bashe moshkeli nist
                call RemoveAnnulusMudArrays(MudSystem%Ann_MudOrKick%Length())
            endif
            
            MudSystem%UtubeMode2Activated= .false.
        endif
        

!========================Utube2 Removing from Annulus End================= 
        
!========================New Pipe Filling=================         
    
        if (MudSystem%AddedElementsToString > 0) then      ! StringUpdate == .true.
            
            !NoPipeAdded= F_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=' , 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
         !if (ABS(StringDensity_Old - Hz_Density%Last()) >= 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
            
            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)
                            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
!========================STRING END=================

    !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(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
    !     write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))        
    !    
    !    
    !write(*,*) '==== a before'     
    
    iloc_changedTo2 = 0
    
    IF (MudSystem%Op_MudOrKick%Last() /= 0 .and. MudSystem%Op_MudOrKick%Last()==MudSystem%Ann_MudOrKick%First())  then
        MudSystem%iLoc=2   ! it may be 1,2,3 or more,  all of them are kick
        iloc_changedTo2= 1
    endif
    
    

    iloc_edited= 0
    !write(*,*) sum(Op_MudDischarged_Volume%Array(:)) , ((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline) , Ann_MudDischarged_Volume%First() , sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) 
    if (MudSystem%iLoc==2 .and.  sum(MudSystem%Op_MudDischarged_Volume%Array(:))+((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline)+MudSystem%Ann_MudDischarged_Volume%First() < sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts))  ) then
        MudSystem%iLoc = 1
        iloc_edited = 1
        !write(*,*) 'hellooooooo'
    endif
    

!write(*,*) 'ann-cap:' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1 :F_StringIntervalCounts+F_AnnulusIntervalCounts) )           
        
    
 !write(*,*) 'iloc====' , iloc
 !MudVolume_InjectedToBH  
    
    
!=============================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 ==============================   
       
    !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(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
    !     write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))       
    !    
    !    
    !    
    !write(*,*) 'pump added====before add to ann'  
        
        
!=============== 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
    MudSystem%Op_NeededVolume_ToFill= 0.d0
    
    
    
    
    do imud=1, MudSystem%Op_MudDischarged_Volume%Length()
        
            MudSystem%OpMudVolumeSum= MudSystem%OpMudVolumeSum + MudSystem%Op_MudDischarged_Volume%Array(imud)
        
        if ( MudSystem%OpMudVolumeSum > sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts)) ) then !1st mode
            
            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))
                MudSystem%Saved_Op_MudOrKick= MudSystem%Op_MudOrKick%Array (imud)
                MudSystem%Op_KickSaved_Density= MudSystem%Op_Density%Array(imud)
                MudSystem%iLoc= 2
                iloc_changedTo2= 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)
                    MudSystem%Saved_Op_MudOrKick= MudSystem%Op_MudOrKick%Array (ii)
                    MudSystem%Op_KickSaved_Density= MudSystem%Op_Density%Array(ii)
                    MudSystem%iLoc= 2
                    iloc_changedTo2= 3
                END IF
            enddo
            
            exit ! exits do
            
        endif
        
    enddo
        
        if ( sum(MudSystem%Op_MudDischarged_Volume%Array(:)) < sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts)) ) then !2nd & 3rd mode
            
            MudSystem%Op_NeededVolume_ToFill= sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts)) - sum(MudSystem%Op_MudDischarged_Volume%Array(:))
        endif

        
    !
    !write(*,*) 'Op_NeededVolume_ToFill=' , Op_NeededVolume_ToFill  
    !write(*,*) 'Op_Saved_MudDischarged_Volume=' , Op_Saved_MudDischarged_Volume       
    !write(*,*) 'Op_Kick_Saved_Volume=' , Op_Kick_Saved_Volume 
    !
    !write(*,*) 'op cap=' , sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) 
    !write(*,*) ' op sum mud=' , sum(Op_MudDischarged_Volume%Array(:))
    
    
             

 
!======================================================================    
                
   
    
    
!========================Tripping Out- 1st & 3rd Mode====================
        


        if ( (MudSystem%Op_Kick_Saved_Volume > 0.0 .or. MudSystem%Op_Saved_MudDischarged_Volume> 0.0) .or.  &     ! 1st Mode-Pump flow is more than trip out so fluid Level in Annulus Increases
        (MudSystem%Op_NeededVolume_ToFill < ABS(MudSystem%DeltaVolumeAnnulusCapacity)) ) then   !3rd Mode-fluid Level in Annulus Increases 
            
        
        !if ( Op_Kick_Saved_Volume > 0.0 .or. Op_Saved_MudDischarged_Volume> 0.0 )   write(*,*) 'trip out 1st mode'
        
        if ( MudSystem%Op_NeededVolume_ToFill > 0.0 .and. MudSystem%Op_NeededVolume_ToFill < ABS(MudSystem%DeltaVolumeAnnulusCapacity) )  then
         !   write(*,*) 'trip out 3rd mode'
            
            MudSystem%NewVolume= 0.d0 ! for condition iloc=1
            
            SavedDensityForOp= MudSystem%Ann_Density%Array(1)
          
            ExcessMudVolume_Remained= MudSystem%Op_NeededVolume_ToFill      
          
            
            imud=1
           
            Do
                
                if(MudSystem%Ann_MudDischarged_Volume%Array(imud) < ExcessMudVolume_Remained) then
                    ExcessMudVolume_Remained= ExcessMudVolume_Remained- MudSystem%Ann_MudDischarged_Volume%Array(imud)
                    call MudSystem%Ann_MudDischarged_Volume%Remove (imud)
                    call MudSystem%Ann_Mud_Backhead_X%Remove (imud)
                    call MudSystem%Ann_Mud_Backhead_section%Remove (imud)
                    call MudSystem%Ann_Mud_Forehead_X%Remove (imud)
                    call MudSystem%Ann_Mud_Forehead_section%Remove (imud)
                    call MudSystem%Ann_Density%Remove (imud)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%Remove (imud)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%Remove (imud)
                    call MudSystem%Ann_MudOrKick%Remove (imud)  
                    
                elseif(MudSystem%Ann_MudDischarged_Volume%Array(imud) > ExcessMudVolume_Remained) then
                    MudSystem%Ann_MudDischarged_Volume%Array(imud)= MudSystem%Ann_MudDischarged_Volume%Array(imud)- ExcessMudVolume_Remained
                    exit
                    
                else    !(Ann_MudDischarged_Volume%Array(imud) == ExcessMudVolume_Remained) 
                    call MudSystem%Ann_MudDischarged_Volume%Remove (imud)
                    call MudSystem%Ann_Mud_Backhead_X%Remove (imud)
                    call MudSystem%Ann_Mud_Backhead_section%Remove (imud)
                    call MudSystem%Ann_Mud_Forehead_X%Remove (imud)
                    call MudSystem%Ann_Mud_Forehead_section%Remove (imud)
                    call MudSystem%Ann_Density%Remove (imud)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%Remove (imud)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%Remove (imud)
                    call MudSystem%Ann_MudOrKick%Remove (imud) 
                    exit
                    
                endif
                
            enddo
            
            
       !write(*,*) 'Op_NeededVolume_ToFill=' ,Op_NeededVolume_ToFill
       !write(*,*) 'ABS(DeltaVolumeAnnulusCapacity)=' ,ABS(DeltaVolumeAnnulusCapacity)
       !write(*,*) 'Op_MudOrKick%Last()=' ,Op_MudOrKick%Last()
       !write(*,*) 'iloc=' ,iloc
       !write(*,*) 'iloc_edited=' ,iloc_edited
              
            
        endif
        

    ! (MudSystem%AnnulusFlowRate/60.)*DeltaT_Mudline) - DeltaVolumeOp  will be added to annulus
    
    !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
    !    if ( ABS(AnnulusSuctionDensity_Old - MudSystem%St_Density%Last()) >= DensityMixTol ) then ! new mud is pumped
    !    call Ann_Density%AddTo (iLoc,MudSystem%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) 
    !         
    !    AnnulusSuctionDensity_Old= MudSystem%St_Density%Last()
    !        
    !    MudIsChanged= .true.
    !    endif  
    !    
    !            Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+ ((MudSystem%AnnulusFlowRate/60.0d0)*DeltaT_Mudline) - ((2-iloc)*ABS(DeltaVolumePipe))    !(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)- (and add pipe)
         MudSystem%Ann_Mud_Backhead_X%Array(1)= MudSystem%BackheadX
         
         
         
                !iloc=1 : (2-iloc)=1 normal
                !iloc=2 : (2-iloc)=0 kick influx or migration is in annulus
         
!========================Same to Tripping In==================== 

        !write(*,*) 'Op_Kick_Saved_Volume,Op_Saved_MudDischarged_Volume=' , Op_Kick_Saved_Volume,Op_Saved_MudDischarged_Volume

                
                if (MudSystem%Op_Kick_Saved_Volume > 0.0 .and. MudSystem%Ann_MudOrKick%First() == 0) then   !1st Mode
                    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_NeededVolume_ToFill > 0.0 .and. (MudSystem%Op_NeededVolume_ToFill < ABS(MudSystem%DeltaVolumeAnnulusCapacity)) .and. MudSystem%Op_MudOrKick%Last() == 0 .and. (MudSystem%iLoc==2 .or. iloc_edited==1)) then   !3rd Mode               
                !write(*,*) 'checkpoint 0'
           !! for avoid kick separation -Op_MudOrKick%Last() == 0: because of pump
                    MudSystem%NewVolume= ((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) ! =volume that should be added to iloc=2 in Ann
                    call RemoveOpMudArrays(MudSystem%Op_Density%Length()) ! mud here is removed and then will be added to iloc=2 in Ann in %%1 section
                    if ( MudSystem%Ann_MudDischarged_Volume%Array(1) > ((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) ) then! 1st in Ann = kick ,, we expect: ((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline)= OpMudVolLast
                        MudSystem%Ann_MudDischarged_Volume%Array(1)= MudSystem%Ann_MudDischarged_Volume%Array(1) - ((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline)
                        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)   ! 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)
                        write(*,*) 'little expand'
                        ! including  a little expand
                    endif
        endif  
                
        if (MudSystem%Op_Saved_MudDischarged_Volume> 0.0) then   !1st Mode 
            MudSystem%NewDensity= MudSystem%Op_MudSaved_Density
            !write(*,*) 'iloc,...' , iloc,((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline),Op_Saved_MudDischarged_Volume
            if (MudSystem%iLoc==1) then
                !write(*,*) 'checkpoint 1'
                MudSystem%NewVolume= MudSystem%Op_Saved_MudDischarged_Volume
            elseif (real(((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline)) - real(MudSystem%Op_Saved_MudDischarged_Volume) > 0.d0 ) then                   ! for avoid kick separation
                !write(*,*) 'checkpoint 2'
                MudSystem%NewVolume= ((MudSystem%AnnulusFlowRate/60.d0)*MudSystem%DeltaT_Mudline) !- Op_Saved_MudDischarged_Volume
                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
                    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(*,*) 'little expand'

                    ! including  a little expand
                endif
                

            else        ! iloc==2 , ((MudSystem%AnnulusFlowRate/60.d0)*DeltaT_Mudline) == Op_Saved_MudDischarged_Volume
                !write(*,*) 'checkpoint 3'
               MudSystem%NewVolume= MudSystem%Op_Saved_MudDischarged_Volume ! it is normal mode
            endif
            
            
        endif
        
                !write(*,*) 'NewVolume=' ,NewVolume
                

        if( MudSystem%Ann_Density%Length() == 1 .and. MudSystem%iLoc ==2 ) then
            
        write(*,*) '***errorb****=='
        
        write(*,*) 'iloc_edited=' , iloc_edited
        write(*,*) 'iloc_changedTo2=' , iloc_changedTo2
        
        write(*,*) 'Op_Capacity===' , sum(MudSystem%OpSection_VolumeCapacity(1:F_Counts%BottomHoleIntervalCounts))
        
         WRITE (*,*) 'Op_Saved_MudDischarged_Volume, Op_Kick_Saved_Volume',MudSystem%Op_Saved_MudDischarged_Volume, MudSystem%Op_Kick_Saved_Volume
        
        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(*,*) '==***errorb****'
        endif        
        
        
        
        
                
                if ((ROP_Bit%RateOfPenetration==0 .and. abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%DensityMixTol) &     !%%1 section
                .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
                 !write(*,*) '%%1 section a)'
                    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
                 !write(*,*) '%%1 section b)'
                    
                    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

     
   
             
!========================Same to Tripping In - End====================     
            
        !write(*,*)  'b)Ann_Mud sum=' , sum(Ann_MudDischarged_Volume%Array(:)) 
 
    !write(*,*) 'no======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             
    !    
    !    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(*,*) '2======no' 
          
!=============== 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
            
            exit ! exits do
            
        endif
        
    enddo
    
MudSystem%Ann_Saved_MudDischarged_Volume_Final= MudSystem%Ann_Saved_MudDischarged_Volume
MudSystem%Ann_Kick_Saved_Volume_Final= MudSystem%Ann_Kick_Saved_Volume
         !write(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_Counts%StringIntervalCounts+1:NoPipeSections))
         !write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))
         
IF (MudSystem%WellHeadIsOpen)       MudSystem%MudVolume_InjectedFromAnn = MudSystem%Ann_Saved_MudDischarged_Volume_Final-((MudSystem%Qlost/60.0d0)*MudSystem%DeltaT_Mudline)
      !NoGasPocket 
!write(*,*) 'Ann_Saved_Mud_Vol,Ann_Kick_Saved_Vol=' , Ann_Saved_MudDischarged_Volume,Ann_Kick_Saved_Volume

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

         
        !write(*,*)  'Ann_Saved_Mud=' , Ann_Saved_MudDischarged_Volume       
!======================== 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
            
            !    write(*,*) 'imud==' , imud
            !write(*,*) '***)Ann_Mud_Backhead_section(imud)= ' , Ann_Mud_Backhead_section%Array(imud), Ann_density%Array(imud)
                
                
            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
                                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         
     
    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================= 


    
!*************************************************************************************************************************                    
    
!========================Tripping Out- 2nd Mode====================
    
    
        elseif ( MudSystem%Op_NeededVolume_ToFill > ABS(MudSystem%DeltaVolumeAnnulusCapacity) ) then   !pump is off or Pump flow is less than trip out so fluid Level in Annulus decreases 
        !write(*,*) 'trip out 2nd mode'
            

            SavedDensityForOp= MudSystem%Ann_Density%Array(1)      
!========================ANNULUS ENTRANCE==================== 
        
        ! <<< SIMILAR TO UTUBE 2 >>>
                 if ( MudSystem%Ann_Density%Last() /= 0.0 ) then     ! new mud is pumped
                    call MudSystem%Ann_Density%Add (0.0d0)   
                    call MudSystem%Ann_MudDischarged_Volume%Add (0.0d0)
                    call MudSystem%Ann_Mud_Forehead_X%Add (MudSystem%Xend_PipeSection(MudSystem%NoPipeSections))
                    call MudSystem%Ann_Mud_Forehead_section%Add (MudSystem%NoPipeSections)
                    call MudSystem%Ann_Mud_Backhead_X%Add (MudSystem%Xstart_PipeSection(MudSystem%NoPipeSections))
                    call MudSystem%Ann_Mud_Backhead_section%Add (MudSystem%NoPipeSections)
                    call MudSystem%Ann_RemainedVolume_in_LastSection%Add (0.0d0)
                    call MudSystem%Ann_EmptyVolume_inBackheadLocation%Add (0.0d0)
                    call MudSystem%Ann_MudOrKick%Add (104)
                    call MudSystem%Ann_CuttingMud%Add (0)
             
                     !AnnulusSuctionDensity_Old= Hz_Density%Last()
                 endif    

         MudSystem%Ann_Mud_Forehead_section%Array(MudSystem%Ann_Mud_Forehead_section%Length())= MudSystem%NoPipeSections !it is needed to be updated for (a condition that one pipe is removed from Annulus due to trip out)- (and add pipe)
         MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%Ann_Mud_Forehead_X%Length())= MudSystem%Xend_PipeSection(MudSystem%NoPipeSections)
               
         
         MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%Ann_MudDischarged_Volume%Length())= MudSystem%Ann_MudDischarged_Volume%Last()+ (MudSystem%Op_NeededVolume_ToFill - ABS(MudSystem%DeltaVolumeAnnulusCapacity))  !  Op_NeededVolume_ToFill !ABS(DeltaVolumePipe) - ((MudSystem%AnnulusFlowRate/60.)*DeltaT_Mudline)    !(gal)                    

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

      

                if ( (MudSystem%iLoc==2 .or. iloc_edited==1) .and. MudSystem%Op_MudOrKick%Last()==0 ) then                    ! for avoid kick separation
                   !write(*,*) 'here mud should be removed from Op last'
                    
                    if (abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%Op_Density%Last())< MudSystem%DensityMixTol) then
                    
                        MudSystem%Ann_Density%Array(MudSystem%iLoc)= (MudSystem%Ann_Density%Array(MudSystem%iLoc)*MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%Op_Density%Last()*MudSystem%Op_MudDischarged_Volume%Last())/(MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%Op_MudDischarged_Volume%Last())
                        MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%Op_MudDischarged_Volume%Last()   ! OP_Last is mud(effect of pump added mud)
                        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%Op_Density%Last())
                        call MudSystem%Ann_MudDischarged_Volume%AddTo (MudSystem%iLoc,MudSystem%Op_MudDischarged_Volume%Last())
                        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)
                    endif
                    
                    MudSystem%Op_NeededVolume_ToFill= MudSystem%Op_NeededVolume_ToFill + MudSystem%Op_MudDischarged_Volume%Last()     ! OP_Last is mud(effect of pump added mud)
                    
                    call RemoveOpMudArrays(MudSystem%Op_MudOrKick%Length())
                    
                    
                endif                
!=================================================================== 
       
                
!=============== save Ann Mud data to transfer to the ChokeLine enterance
    !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
    !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
    !        
    !        exit ! exits do
    !        
    !    endif
    !    
    !enddo
    
    
    ! write(*,*) 'check point 2=='
    !    
    !      
    !    
    !    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(*,*) '==check point 2'      
    
    
    
    
    
MudSystem%Ann_Saved_MudDischarged_Volume_Final= MudSystem%Ann_Saved_MudDischarged_Volume
MudSystem%Ann_Kick_Saved_Volume_Final= MudSystem%Ann_Kick_Saved_Volume
         !write(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
         !write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))

         !write(*,*) 'Ann_Saved_MudDischarged_Volume_Final=' , Ann_Saved_MudDischarged_Volume_Final


         
IF (MudSystem%WellHeadIsOpen)       MudSystem%MudVolume_InjectedFromAnn = MudSystem%Ann_Saved_MudDischarged_Volume_Final-((MudSystem%Qlost/60.0d0)*MudSystem%DeltaT_Mudline)
         !! NoGasPocket > 0 .AND. 
         
!write(*,*) 'Ann_Saved_Mud_Vol,Ann_Kick_Saved_Vol=' , Ann_Saved_MudDischarged_Volume,Ann_Kick_Saved_Volume


!======================================================================                               
                
!========================ANNULUS==================== 
        ! <<< SIMILAR TO UTUBE 2 >>>
                
                !write(*,*) Ann_MudOrKick%Last(), 'DeltaVolumePipe , after volume=' ,ABS(DeltaVolumePipe), Ann_MudDischarged_Volume%Last()
imud= MudSystem%Ann_Mud_Forehead_X%Length() + 1

    do while (imud > 1)
        imud = imud - 1 
        
            if (imud< MudSystem%Ann_Mud_Forehead_X%Length()) then
                MudSystem%Ann_Mud_Forehead_X%Array(imud)= MudSystem%Ann_Mud_Backhead_X%Array(imud+1)
                MudSystem%Ann_Mud_Forehead_section%Array(imud)= MudSystem%Ann_Mud_Backhead_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
               MudSystem%LostInTripOutIsDone= .true. 
            ENDIF
!           Fracture Shoe Lost >>>              
            
            
            
            
            
            
            
            
            !write(*,*) 'a)imud,Ann_Mud_Forehead_section=',imud,Ann_Mud_Forehead_section%Array(imud)
                
            MudSystem%DirectionCoef= (MudSystem%Xend_PipeSection(MudSystem%Ann_Mud_Forehead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%Ann_Mud_Forehead_section%Array(imud))) &
                / ABS(MudSystem%Xend_PipeSection(MudSystem%Ann_Mud_Forehead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%Ann_Mud_Forehead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
            !write(*,*) 'b)imud,Forehead_X,Xstart_PipeSection=',imud,Ann_Mud_Forehead_X%Array(imud),Xstart_PipeSection(Ann_Mud_Forehead_section%Array(imud))
                                                                                                                    
            MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Ann_Mud_Forehead_X%Array(imud)- MudSystem%Xstart_PipeSection(MudSystem%Ann_Mud_Forehead_section%Array(imud)))* &
                MudSystem%Area_PipeSectionFt(MudSystem%Ann_Mud_Forehead_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_Backhead_section%Array(imud)= MudSystem%Ann_Mud_Forehead_section%Array(imud)
                MudSystem%Ann_Mud_Backhead_X%Array(imud)= MudSystem%Ann_Mud_Forehead_X%Array(imud)- MudSystem%DirectionCoef*(MudSystem%Ann_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_PipeSectionFt(MudSystem%Ann_Mud_Forehead_section%Array(imud))
                                                                            !   7.48051948 is for gal to ft^3
            else   
                MudSystem%isection= MudSystem%Ann_Mud_Forehead_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 < F_Counts%StringIntervalCounts+1) then        ! last pipe section(well exit) F_Counts%StringIntervalCounts+1 is the first section in Annulus
                            MudSystem%Ann_MudDischarged_Volume%Array(imud)= MudSystem%Ann_MudDischarged_Volume%Array(imud)- MudSystem%Ann_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%Ann_Mud_Backhead_X%Array(imud)= MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1)
                            MudSystem%Ann_Mud_Backhead_section%Array(imud)= F_Counts%StringIntervalCounts+1
                            
                            if (MudSystem%Ann_MudDischarged_Volume%Array(imud)<= 0.0d0)  then      ! imud is completely exited form the well
                                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_Backhead_section%Array(imud)= MudSystem%isection
                        MudSystem%Ann_Mud_Backhead_X%Array(imud)= (MudSystem%xx * (MudSystem%Xstart_PipeSection(MudSystem%isection)- MudSystem%Xend_PipeSection(MudSystem%isection)))+ MudSystem%Xend_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   
          
    enddo
!========================ANNULUS END================= 
    
        endif       ! end of 1st &3rd & 2nd Mode
        
    
!*************************************************************************************************************************  
    
    


        
        
!======================== Bottom Hole Entrance ==========================  
    !if (iloc == 1) then
    if ( MudSystem%Op_NeededVolume_ToFill > 0.0 ) then        ! it is needed  for 2nd & 3rd mode
        !write(*,*) 'op add for 2nd & 3rd mode done'
        
        

                if ( ABS(MudSystem%Op_Density%Last() - SavedDensityForOp ) >= MudSystem%DensityMixTol) then ! .OR. (Op_MudDischarged_Volume%Last()>42.) ) then           ! 1-Merging conditions are not meeted, so new pocket
                                
                call MudSystem%Op_Density%Add (SavedDensityForOp)
                call MudSystem%Op_MudDischarged_Volume%Add (MudSystem%Op_NeededVolume_ToFill)
                call MudSystem%Op_Mud_Forehead_X%Add (0.0d0)
                call MudSystem%Op_Mud_Forehead_section%Add (1)
                call MudSystem%Op_Mud_Backhead_X%Add (0.0d0)
                call MudSystem%Op_Mud_Backhead_section%Add (1)
                call MudSystem%Op_RemainedVolume_in_LastSection%Add (0.0d0)
                call MudSystem%Op_EmptyVolume_inBackheadLocation%Add (0.0d0)
                call MudSystem%Op_MudOrKick%Add (MudSystem%Ann_MudOrKick%Array(1))
            else                                  ! 2-Pockets are Merged
          
                MudSystem%Op_Density%Array (MudSystem%Op_Density%Length())= (SavedDensityForOp*MudSystem%Op_NeededVolume_ToFill+MudSystem%Op_Density%Last()*MudSystem%Op_MudDischarged_Volume%Last())/(MudSystem%Op_MudDischarged_Volume%Last()+MudSystem%Op_NeededVolume_ToFill)
                MudSystem%Op_MudDischarged_Volume%Array (MudSystem%Op_Density%Length())= MudSystem%Op_MudDischarged_Volume%Array (MudSystem%Op_Density%Length()) + MudSystem%Op_NeededVolume_ToFill
                MudSystem%Op_RemainedVolume_in_LastSection%Array (MudSystem%Op_Density%Length())= 0.0
                MudSystem%Op_EmptyVolume_inBackheadLocation%Array (MudSystem%Op_Density%Length())= 0.0
                                
            endif                     

    endif
    


    
!============================= 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
                
            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
            
         
            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))
                                                                            !   7.48051948 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 MudSystem%Op_MudDischarged_Volume%Remove (imud)
                                call MudSystem%Op_Mud_Backhead_X%Remove (imud)
                                call MudSystem%Op_Mud_Backhead_section%Remove (imud)
                                call MudSystem%Op_Mud_Forehead_X%Remove (imud)
                                call MudSystem%Op_Mud_Forehead_section%Remove (imud)
                                call MudSystem%Op_Density%Remove (imud)
                                call MudSystem%Op_RemainedVolume_in_LastSection%Remove (imud)
                                call MudSystem%Op_EmptyVolume_inBackheadLocation%Remove (imud)
                                call MudSystem%Op_MudOrKick%Remove (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   
        
    enddo


    
!========================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
    !!!    
    !!    write(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
    !!     write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))    
    !!!    
    !!!
    !write(*,*) '==after sorting'       

!========================================================= 
    
    
        MudSystem%total_injected = MudSystem%total_injected + MudSystem%MudVolume_InjectedFromAnn
        
                    if (ChokeControlPanel%ChokePanelStrokeResetSwitch == 1) then
                        MudSystem%total_injected= 0.
                    endif        
        !write(*,*) ' MudSystem%MudVolume_InjectedFromAnn =' , MudSystem%MudVolume_InjectedFromAnn    
        
        !write(*,*) ' total injected-tripout =' , total_injected 
        !write(*,*) ' injected-tripout =' , MudSystem%MudVolume_InjectedFromAnn 
        
        
    
    
    


    end subroutine TripOut_and_Pump