SimulationCore2/Equipments/MudSystem/Trip_Out_andPump.f90

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

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

        StringFlowRate= MUD(2)%Q
        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(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)
        !    
        !    UtubeMode1Activated= .false.
        !endif
        
!========================Utube1 Air Element Removing=================    
          
          
!========================Utube2 Removing from Annulus=================         
    
        if (UtubeMode2Activated== .true.) then      ! StringUpdate == .true.
            TotalAddedVolume=0.
            
            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 (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
         !if (ABS(StringDensity_Old - 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
            
            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)
                            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
!========================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 (Op_MudOrKick%Last() /= 0 .and. Op_MudOrKick%Last()==Ann_MudOrKick%First())  then
        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(:)) , ((AnnulusFlowRate/60.d0)*DeltaT_Mudline) , Ann_MudDischarged_Volume%First() , sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) 
    if (iloc==2 .and.  sum(Op_MudDischarged_Volume%Array(:))+((AnnulusFlowRate/60.d0)*DeltaT_Mudline)+Ann_MudDischarged_Volume%First() < sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))  ) then
        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 ( 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 ==============================   
       
    !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    
    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
    Op_NeededVolume_ToFill= 0.d0
    
    
    
    
    do imud=1, Op_MudDischarged_Volume%Length()
        
            OpMudVolumeSum= OpMudVolumeSum + Op_MudDischarged_Volume%Array(imud)
        
        if ( OpMudVolumeSum > sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) ) then !1st mode
            
            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))
                Saved_Op_MudOrKick= Op_MudOrKick%Array (imud)
                Op_KickSaved_Density= Op_Density%Array(imud)
                iloc= 2
                iloc_changedTo2= 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)
                    Saved_Op_MudOrKick= Op_MudOrKick%Array (ii)
                    Op_KickSaved_Density= Op_Density%Array(ii)
                    iloc= 2
                    iloc_changedTo2= 3
                END IF
            enddo
            
            exit ! exits do
            
        endif
        
    enddo
        
        if ( sum(Op_MudDischarged_Volume%Array(:)) < sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) ) then !2nd & 3rd mode
            
            Op_NeededVolume_ToFill= sum(OpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) - sum(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 ( (Op_Kick_Saved_Volume > 0.0 .or. Op_Saved_MudDischarged_Volume> 0.0) .or.  &     ! 1st Mode-Pump flow is more than trip out so fluid Level in Annulus Increases
        (Op_NeededVolume_ToFill < ABS(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 ( Op_NeededVolume_ToFill > 0.0 .and. Op_NeededVolume_ToFill < ABS(DeltaVolumeAnnulusCapacity) )  then
         !   write(*,*) 'trip out 3rd mode'
            
            NewVolume= 0.d0 ! for condition iloc=1
            
            SavedDensityForOp= Ann_Density%Array(1)
          
            ExcessMudVolume_Remained= Op_NeededVolume_ToFill      
          
            
            imud=1
           
            Do
                
                if(Ann_MudDischarged_Volume%Array(imud) < ExcessMudVolume_Remained) then
                    ExcessMudVolume_Remained= ExcessMudVolume_Remained- Ann_MudDischarged_Volume%Array(imud)
                    call Ann_MudDischarged_Volume%Remove (imud)
                    call Ann_Mud_Backhead_X%Remove (imud)
                    call Ann_Mud_Backhead_section%Remove (imud)
                    call Ann_Mud_Forehead_X%Remove (imud)
                    call Ann_Mud_Forehead_section%Remove (imud)
                    call Ann_Density%Remove (imud)
                    call Ann_RemainedVolume_in_LastSection%Remove (imud)
                    call Ann_EmptyVolume_inBackheadLocation%Remove (imud)
                    call Ann_MudOrKick%Remove (imud)  
                    
                elseif(Ann_MudDischarged_Volume%Array(imud) > ExcessMudVolume_Remained) then
                    Ann_MudDischarged_Volume%Array(imud)= Ann_MudDischarged_Volume%Array(imud)- ExcessMudVolume_Remained
                    exit
                    
                else    !(Ann_MudDischarged_Volume%Array(imud) == ExcessMudVolume_Remained) 
                    call Ann_MudDischarged_Volume%Remove (imud)
                    call Ann_Mud_Backhead_X%Remove (imud)
                    call Ann_Mud_Backhead_section%Remove (imud)
                    call Ann_Mud_Forehead_X%Remove (imud)
                    call Ann_Mud_Forehead_section%Remove (imud)
                    call Ann_Density%Remove (imud)
                    call Ann_RemainedVolume_in_LastSection%Remove (imud)
                    call Ann_EmptyVolume_inBackheadLocation%Remove (imud)
                    call 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
        

    ! (AnnulusFlowRate/60.)*DeltaT_Mudline) - DeltaVolumeOp  will be added to annulus
    
    !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
    !    if ( ABS(AnnulusSuctionDensity_Old - St_Density%Last()) >= DensityMixTol ) 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) 
    !         
    !    AnnulusSuctionDensity_Old= St_Density%Last()
    !        
    !    MudIsChanged= .true.
    !    endif  
    !    
    !            Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+ ((AnnulusFlowRate/60.0d0)*DeltaT_Mudline) - ((2-iloc)*ABS(DeltaVolumePipe))    !(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)- (and add pipe)
         Ann_Mud_Backhead_X%Array(1)= 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 (Op_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() == 0) then   !1st Mode
                    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_NeededVolume_ToFill > 0.0 .and. (Op_NeededVolume_ToFill < ABS(DeltaVolumeAnnulusCapacity)) .and. Op_MudOrKick%Last() == 0 .and. (iloc==2 .or. iloc_edited==1)) then   !3rd Mode               
                !write(*,*) 'checkpoint 0'
           !! for avoid kick separation -Op_MudOrKick%Last() == 0: because of pump
                    NewVolume= ((AnnulusFlowRate/60.d0)*DeltaT_Mudline) ! =volume that should be added to iloc=2 in Ann
                    call RemoveOpMudArrays(Op_Density%Length()) ! mud here is removed and then will be added to iloc=2 in Ann in %%1 section
                    if ( Ann_MudDischarged_Volume%Array(1) > ((AnnulusFlowRate/60.d0)*DeltaT_Mudline) ) then! 1st in Ann = kick ,, we expect: ((AnnulusFlowRate/60.d0)*DeltaT_Mudline)= OpMudVolLast
                        Ann_MudDischarged_Volume%Array(1)= Ann_MudDischarged_Volume%Array(1) - ((AnnulusFlowRate/60.d0)*DeltaT_Mudline)
                        Op_MudDischarged_Volume%Array(Op_Density%Length())= Op_MudDischarged_Volume%Array(Op_Density%Length())+ ((AnnulusFlowRate/60.d0)*DeltaT_Mudline)   ! 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)
                        write(*,*) 'little expand'
                        ! including  a little expand
                    endif
        endif  
                
        if (Op_Saved_MudDischarged_Volume> 0.0) then   !1st Mode 
            NewDensity= Op_MudSaved_Density
            !write(*,*) 'iloc,...' , iloc,((AnnulusFlowRate/60.d0)*DeltaT_Mudline),Op_Saved_MudDischarged_Volume
            if (iloc==1) then
                !write(*,*) 'checkpoint 1'
                NewVolume= Op_Saved_MudDischarged_Volume
            elseif (real(((AnnulusFlowRate/60.d0)*DeltaT_Mudline)) - real(Op_Saved_MudDischarged_Volume) > 0.d0 ) then                   ! for avoid kick separation
                !write(*,*) 'checkpoint 2'
                NewVolume= ((AnnulusFlowRate/60.d0)*DeltaT_Mudline) !- Op_Saved_MudDischarged_Volume
                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
                    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(*,*) 'little expand'

                    ! including  a little expand
                endif
                

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

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

     
   
             
!========================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
    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
            
            exit ! exits do
            
        endif
        
    enddo
    
Ann_Saved_MudDischarged_Volume_Final= Ann_Saved_MudDischarged_Volume
Ann_Kick_Saved_Volume_Final= Ann_Kick_Saved_Volume
         !write(*,*) 'Ann cap=' , sum(PipeSection_VolumeCapacity(F_StringIntervalCounts+1:NoPipeSections))
         !write(*,*) 'Ann mud sum vol=' , sum(Ann_MudDischarged_Volume%Array(:))
         
IF (WellHeadIsOpen)       MudVolume_InjectedFromAnn = Ann_Saved_MudDischarged_Volume_Final-((Qlost/60.0d0)*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 < 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
            
            !    write(*,*) 'imud==' , imud
            !write(*,*) '***)Ann_Mud_Backhead_section(imud)= ' , Ann_Mud_Backhead_section%Array(imud), Ann_density%Array(imud)
                
                
            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
                                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         
     
    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================= 


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

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

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

      

                if ( (iloc==2 .or. iloc_edited==1) .and. Op_MudOrKick%Last()==0 ) then                    ! for avoid kick separation
                   !write(*,*) 'here mud should be removed from Op last'
                    
                    if (abs(Ann_Density%Array(iloc)-Op_Density%Last())< DensityMixTol) then
                    
                        Ann_Density%Array(iLoc)= (Ann_Density%Array(iLoc)*Ann_MudDischarged_Volume%Array(iLoc)+Op_Density%Last()*Op_MudDischarged_Volume%Last())/(Ann_MudDischarged_Volume%Array(iLoc)+Op_MudDischarged_Volume%Last())
                        Ann_MudDischarged_Volume%Array(iLoc)= Ann_MudDischarged_Volume%Array(iLoc)+Op_MudDischarged_Volume%Last()   ! OP_Last is mud(effect of pump added mud)
                        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,Op_Density%Last())
                        call Ann_MudDischarged_Volume%AddTo (iLoc,Op_MudDischarged_Volume%Last())
                        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)
                    endif
                    
                    Op_NeededVolume_ToFill= Op_NeededVolume_ToFill + Op_MudDischarged_Volume%Last()     ! OP_Last is mud(effect of pump added mud)
                    
                    call RemoveOpMudArrays(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
    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
    !        
    !        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'      
    
    
    
    
    
Ann_Saved_MudDischarged_Volume_Final= Ann_Saved_MudDischarged_Volume
Ann_Kick_Saved_Volume_Final= 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 (WellHeadIsOpen)       MudVolume_InjectedFromAnn = Ann_Saved_MudDischarged_Volume_Final-((Qlost/60.0d0)*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= Ann_Mud_Forehead_X%Length() + 1

    do while (imud > 1)
        imud = imud - 1 
        
            if (imud< Ann_Mud_Forehead_X%Length()) then
                Ann_Mud_Forehead_X%Array(imud)= Ann_Mud_Backhead_X%Array(imud+1)
                Ann_Mud_Forehead_section%Array(imud)= Ann_Mud_Backhead_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
               LostInTripOutIsDone= .true. 
            ENDIF
!           Fracture Shoe Lost >>>              
            
            
            
            
            
            
            
            
            !write(*,*) 'a)imud,Ann_Mud_Forehead_section=',imud,Ann_Mud_Forehead_section%Array(imud)
                
            DirectionCoef= (Xend_PipeSection(Ann_Mud_Forehead_section%Array(imud))-Xstart_PipeSection(Ann_Mud_Forehead_section%Array(imud))) &
                / ABS(Xend_PipeSection(Ann_Mud_Forehead_section%Array(imud))-Xstart_PipeSection(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))
                                                                                                                    
            Ann_EmptyVolume_inBackheadLocation%Array(imud)= DirectionCoef* (Ann_Mud_Forehead_X%Array(imud)- Xstart_PipeSection(Ann_Mud_Forehead_section%Array(imud)))* &
                Area_PipeSectionFt(Ann_Mud_Forehead_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_Backhead_section%Array(imud)= Ann_Mud_Forehead_section%Array(imud)
                Ann_Mud_Backhead_X%Array(imud)= Ann_Mud_Forehead_X%Array(imud)- DirectionCoef*(Ann_MudDischarged_Volume%Array(imud)/7.48051948d0)/Area_PipeSectionFt(Ann_Mud_Forehead_section%Array(imud))
                                                                            !   7.48051948 is for gal to ft^3
            else   
                isection= Ann_Mud_Forehead_section%Array(imud)-1
                Ann_RemainedVolume_in_LastSection%Array(imud)= Ann_MudDischarged_Volume%Array(imud)- Ann_EmptyVolume_inBackheadLocation%Array(imud)
                
                do 
                        if (isection < F_StringIntervalCounts+1) then        ! last pipe section(well exit) F_StringIntervalCounts+1 is the first section in Annulus
                            Ann_MudDischarged_Volume%Array(imud)= Ann_MudDischarged_Volume%Array(imud)- Ann_RemainedVolume_in_LastSection%Array(imud)
                            Ann_Mud_Backhead_X%Array(imud)= Xstart_PipeSection(F_StringIntervalCounts+1)
                            Ann_Mud_Backhead_section%Array(imud)= F_StringIntervalCounts+1
                            
                            if (Ann_MudDischarged_Volume%Array(imud)<= 0.0d0)  then      ! imud is completely exited form the well
                                call RemoveAnnulusMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    xx= Ann_RemainedVolume_in_LastSection%Array(imud)/ PipeSection_VolumeCapacity(isection)   !(gal)
                        
                    if (xx<= 1.0) then
                        Ann_Mud_Backhead_section%Array(imud)= isection
                        Ann_Mud_Backhead_X%Array(imud)= (xx * (Xstart_PipeSection(isection)- Xend_PipeSection(isection)))+ Xend_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   
          
    enddo
!========================ANNULUS END================= 
    
        endif       ! end of 1st &3rd & 2nd Mode
        
    
!*************************************************************************************************************************  
    
    


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

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

    endif
    


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

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


    end subroutine TripOut_and_Pump