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 KickVariables
        Use CShoeVariables
        use CError
   
   implicit none
   
integer i,ii,AddLocation, iloc_edited, iloc_changedTo2
Real(8) ExcessMudVolume_Remained,SavedDensityForOp

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

        MudSystemDotStringFlowRate= MUD(2)%Q
        MudSystemDotAnnulusFlowRate= 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) >= MudSystemDotDensityMixTol) then     ! new mud is pumped
             
            call MudSystemDotHz_Density%AddToFirst (Suction_Density_MudSystem)
            call MudSystemDotHz_MudDischarged_Volume%AddToFirst (0.0d0)
            call MudSystemDotHz_Mud_Forehead_X%AddToFirst (MudSystemDotXstart_PipeSection(1))
            call Hz_Mud_Forehead_section%AddToFirst (1)
            call MudSystemDotHz_Mud_Backhead_X%AddToFirst (MudSystemDotXstart_PipeSection(1))
            call Hz_Mud_Backhead_section%AddToFirst (1)
            call MudSystemDotHz_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
            call MudSystemDotHz_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
            call Hz_MudOrKick%AddToFirst (0)  
             
             SuctionDensity_Old= Suction_Density_MudSystem
         endif

!========================Horizontal PIPE STRING================= 
         
                MudSystemDotHz_MudDischarged_Volume%Array(1)= MudSystemDotHz_MudDischarged_Volume%Array(1)+ ((MudSystemDotStringFlowRate/60.0d0)*DeltaT_Mudline)    !(gal)
        
                
                MudSystemDottotal_add = MudSystemDottotal_add + ((MudSystemDotStringFlowRate/60.0d0)*DeltaT_Mudline)
                
                
                    if (ChokeControlPanel%ChokePanelStrokeResetSwitch == 1) then
                        MudSystemDottotal_add= 0.
                    endif                 
                
        !write(*,*) ' total decrease(add to HZ)=' , total_add 
        !write(*,*) ' add to HZ=' , ((StringFlowRate/60.0d0)*DeltaT_Mudline)                
        
                
                
MudSystemDotimud=0       
    do while (MudSystemDotimud < MudSystemDotHz_Mud_Forehead_X%Length())
        MudSystemDotimud = MudSystemDotimud + 1 
        
            if (MudSystemDotimud> 1) then
                MudSystemDotHz_Mud_Backhead_X%Array(MudSystemDotimud)= MudSystemDotHz_Mud_Forehead_X%Array(MudSystemDotimud-1)
                Hz_Mud_Backhead_section%Array(MudSystemDotimud)= Hz_Mud_Forehead_section%Array(MudSystemDotimud-1)
            endif

                
            MudSystemDotDirectionCoef= (MudSystemDotXend_PipeSection(Hz_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(Hz_Mud_Backhead_section%Array(MudSystemDotimud))) &
                / ABS(MudSystemDotXend_PipeSection(Hz_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(Hz_Mud_Backhead_section%Array(MudSystemDotimud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystemDotHz_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotDirectionCoef* (MudSystemDotXend_PipeSection(Hz_Mud_Backhead_section%Array(MudSystemDotimud))- MudSystemDotHz_Mud_Backhead_X%Array(MudSystemDotimud))* &
                MudSystemDotArea_PipeSectionFt(Hz_Mud_Backhead_section%Array(MudSystemDotimud)) !(ft^3)          
            MudSystemDotHz_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotHz_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)* 7.48051948d0        ! ft^3  to gal
            

            if ( MudSystemDotHz_MudDischarged_Volume%Array(MudSystemDotimud) <= MudSystemDotHz_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)) then
                Hz_Mud_Forehead_section%Array(MudSystemDotimud)= Hz_Mud_Backhead_section%Array(MudSystemDotimud)
                MudSystemDotHz_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotHz_Mud_Backhead_X%Array(MudSystemDotimud)+ MudSystemDotDirectionCoef*(MudSystemDotHz_MudDischarged_Volume%Array(MudSystemDotimud)/7.48051948d0)/MudSystemDotArea_PipeSectionFt(Hz_Mud_Backhead_section%Array(MudSystemDotimud))
                
            else
                
                
                MudSystemDotisection= Hz_Mud_Backhead_section%Array(MudSystemDotimud)+1
                MudSystemDotHz_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotHz_MudDischarged_Volume%Array(MudSystemDotimud)- MudSystemDotHz_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)
                    
                do 
                        if (MudSystemDotisection > 1) then        ! (horizontal pipe exit)
                            MudSystemDotHz_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotHz_MudDischarged_Volume%Array(MudSystemDotimud)- MudSystemDotHz_RemainedVolume_in_LastSection%Array(MudSystemDotimud)
                            MudSystemDotHz_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotXend_PipeSection(1)
                            Hz_Mud_Forehead_section%Array(MudSystemDotimud)= 1
                            
                            if (MudSystemDotHz_MudDischarged_Volume%Array(MudSystemDotimud)<= 0.0d0)  then      ! imud is completely exited form the string
                                call RemoveHzMudArrays(MudSystemDotimud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystemDotxx= MudSystemDotHz_RemainedVolume_in_LastSection%Array(MudSystemDotimud)/ MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)   !(gal)
                        
                    if (MudSystemDotxx<= 1.0) then
                        Hz_Mud_Forehead_section%Array(MudSystemDotimud)= MudSystemDotisection
                        MudSystemDotHz_Mud_Forehead_X%Array(MudSystemDotimud)= (MudSystemDotxx * (MudSystemDotXend_PipeSection(MudSystemDotisection)- MudSystemDotXstart_PipeSection(MudSystemDotisection)))+ MudSystemDotXstart_PipeSection(MudSystemDotisection)
                        exit
                    else
                        MudSystemDotHz_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotHz_RemainedVolume_in_LastSection%Array(MudSystemDotimud)- MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)
                        MudSystemDotisection= MudSystemDotisection+ 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 (MudSystemDotUtubeMode2Activated== .true.) then      ! StringUpdate == .true.
            MudSystemDotTotalAddedVolume=0.
            
            if (Ann_MudOrKick%Last() == 104) then        !movaghati. albate age merge anjam shode bashe moshkeli nist
                call RemoveAnnulusMudArrays(Ann_MudOrKick%Length())
            endif
            
            MudSystemDotUtubeMode2Activated= .false.
        endif
        

!========================Utube2 Removing from Annulus End================= 
        
!========================New Pipe Filling=================         
    
        if (MudSystemDotAddedElementsToString > 0) then      ! StringUpdate == .true.
            
            !NoPipeAdded= F_StringIntervalCounts - F_StringIntervalCountsOld

            
            MudSystemDotNewPipeFilling=0
            
            IF (St_MudOrKick%First() == 104) then
                MudSystemDotSt_MudDischarged_Volume%Array(1) = MudSystemDotSt_MudDischarged_Volume%Array(1) + sum(MudSystemDotPipeSection_VolumeCapacity(2:1+MudSystemDotAddedElementsToString))   ! new pipe is filled by air
            else
                call St_Density%AddToFirst (0.d0)
                call MudSystemDotSt_MudDischarged_Volume%AddToFirst (sum(MudSystemDotPipeSection_VolumeCapacity(2:1+MudSystemDotAddedElementsToString)))
                call MudSystemDotSt_Mud_Forehead_X%AddToFirst (MudSystemDotXstart_PipeSection(2))
                call St_Mud_Forehead_section%AddToFirst (2)
                call MudSystemDotSt_Mud_Backhead_X%AddToFirst (MudSystemDotXstart_PipeSection(2))
                call St_Mud_Backhead_section%AddToFirst (2)
                call MudSystemDotSt_RemainedVolume_in_LastSection%AddToFirst (0.d0)
                call MudSystemDotSt_EmptyVolume_inBackheadLocation%AddToFirst (0.d0)
                call St_MudOrKick%AddToFirst (104)
            endif

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

           
            
                 if (ABS(St_Density%Array(2) - MudSystemDotHz_Density%Last()) >= MudSystemDotDensityMixTol) then     ! new mud is pumped
                    call St_Density%AddTo (2,MudSystemDotHz_Density%Last())
                    call MudSystemDotSt_MudDischarged_Volume%AddTo (2,0.d0)
                    call MudSystemDotSt_Mud_Forehead_X%AddTo (2,MudSystemDotXstart_PipeSection(2))
                    call St_Mud_Forehead_section%AddTo (2 , 2)
                    call MudSystemDotSt_Mud_Backhead_X%AddTo (2,MudSystemDotXstart_PipeSection(2))
                    call St_Mud_Backhead_section%AddTo (2 ,2)
                    call MudSystemDotSt_RemainedVolume_in_LastSection%AddTo (2,0.d0)
                    call MudSystemDotSt_EmptyVolume_inBackheadLocation%AddTo (2,0.d0)
                    call St_MudOrKick%AddTo (2,0)
             
                     !StringDensity_Old= Hz_Density%Last()
                 endif 
                

                MudSystemDotSt_MudDischarged_Volume%Array(2)= MudSystemDotSt_MudDischarged_Volume%Array(2)+ min( ((MudSystemDotStringFlowRate/60.0d0)*DeltaT_Mudline), MudSystemDotLackageMudVolume)  !(gal) 
                
                MudSystemDotSt_MudDischarged_Volume%Array(1)= MudSystemDotSt_MudDischarged_Volume%Array(1)- min( ((MudSystemDotStringFlowRate/60.0d0)*DeltaT_Mudline), MudSystemDotLackageMudVolume)  ! air(gal) 
    
                !LackageMudVolumeAfterFilling= sum(PipeSection_VolumeCapacity(2:F_StringIntervalCounts)) - sum(St_MudDischarged_Volume%Array(:))
                
                MudSystemDotLackageMudVolumeAfterFilling= MudSystemDotSt_MudDischarged_Volume%Array(1)      ! last time it should be zero
                
                
                
                if (MudSystemDotLackageMudVolumeAfterFilling == 0.) then
                    MudSystemDotNewPipeFilling= 1
                    call RemoveStringMudArrays(1)
                    MudSystemDotSt_Mud_Backhead_X%Array(1) = MudSystemDotXstart_PipeSection(2)
                    St_Mud_Backhead_section%Array(1) = 2
                endif
                
          endif

!========================New Pipe Filling End=================         
        
        
        if (MudSystemDotNewPipeFilling == 0) then
            MudSystemDotStringFlowRate= 0.
            MudSystemDotAnnulusFlowRate= 0.
        endif   
        
        MudSystemDotStringFlowRateFinal= MudSystemDotStringFlowRate
        MudSystemDotAnnulusFlowRateFinal= MudSystemDotAnnulusFlowRate
     
    
!========================STRING ENTRANCE================= 
         if (MudSystemDotStringFlowRateFinal > 0.0 .and. ABS(St_Density%First() - MudSystemDotHz_Density%Last()) >= MudSystemDotDensityMixTol) then     ! new mud is pumped
         !if (ABS(StringDensity_Old - Hz_Density%Last()) >= DensityMixTol) then     ! new mud is pumped
            call St_Density%AddToFirst (MudSystemDotHz_Density%Last())
            call MudSystemDotSt_MudDischarged_Volume%AddToFirst (0.0d0)
            call MudSystemDotSt_Mud_Forehead_X%AddToFirst (MudSystemDotXstart_PipeSection(2))
            call St_Mud_Forehead_section%AddToFirst (2)
            call MudSystemDotSt_Mud_Backhead_X%AddToFirst (MudSystemDotXstart_PipeSection(2))
            call St_Mud_Backhead_section%AddToFirst (2)
            call MudSystemDotSt_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
            call MudSystemDotSt_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
            call St_MudOrKick%AddToFirst (0)
             
             !StringDensity_Old= Hz_Density%Last()
         endif
                MudSystemDotSt_MudDischarged_Volume%Array(1)= MudSystemDotSt_MudDischarged_Volume%Array(1)+ ((MudSystemDotStringFlowRate/60.0d0)*DeltaT_Mudline)    !(gal)

!=============== save String Mud data=========== 
    MudSystemDotStMudVolumeSum= 0.d0
    !St_MudSaved_Density= 0.d0
    MudSystemDotSt_Saved_MudDischarged_Volume= 0.d0
    !Saved_St_MudOrKick= 0
    !Ann_to_Choke_2mud= .false.

    do MudSystemDotimud=1, MudSystemDotSt_MudDischarged_Volume%Length()
        
            MudSystemDotStMudVolumeSum= MudSystemDotStMudVolumeSum + MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud)
        
        if ( MudSystemDotStMudVolumeSum > sum(MudSystemDotPipeSection_VolumeCapacity(2:F_StringIntervalCounts)) ) then
            
            !IF (St_MudOrKick%Array(imud) == 0) THEN
                MudSystemDotSt_MudSaved_Density = St_Density%Array(MudSystemDotimud)
                MudSystemDotSt_Saved_MudDischarged_Volume = MudSystemDotStMudVolumeSum - sum(MudSystemDotPipeSection_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= MudSystemDotimud + 1, MudSystemDotSt_MudDischarged_Volume%Length()
                !IF (St_MudOrKick%Array(ii) == 0) THEN
                    MudSystemDotSt_MudSaved_Density = ((MudSystemDotSt_MudSaved_Density * MudSystemDotSt_Saved_MudDischarged_Volume) + (St_Density%Array(ii) * MudSystemDotSt_MudDischarged_Volume%Array(ii))) / (MudSystemDotSt_Saved_MudDischarged_Volume + MudSystemDotSt_MudDischarged_Volume%Array(ii))
                    MudSystemDotSt_Saved_MudDischarged_Volume = MudSystemDotSt_Saved_MudDischarged_Volume + MudSystemDotSt_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
MudSystemDotSt_Saved_MudDischarged_Volume_Final= MudSystemDotSt_Saved_MudDischarged_Volume

IF (WellHeadIsOpen)     MudSystemDotMudVolume_InjectedToBH = MudSystemDotSt_Saved_MudDischarged_Volume_Final

!======================================================================                 
                           
                
!========================STRING================= 
         
MudSystemDotimud=0  
    do while (MudSystemDotimud < MudSystemDotSt_Mud_Forehead_X%Length())
        MudSystemDotimud = MudSystemDotimud + 1        
        
            if (MudSystemDotimud> 1) then
                MudSystemDotSt_Mud_Backhead_X%Array(MudSystemDotimud)= MudSystemDotSt_Mud_Forehead_X%Array(MudSystemDotimud-1)
                St_Mud_Backhead_section%Array(MudSystemDotimud)= St_Mud_Forehead_section%Array(MudSystemDotimud-1)
            endif
            
            MudSystemDotDirectionCoef= (MudSystemDotXend_PipeSection(St_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(St_Mud_Backhead_section%Array(MudSystemDotimud))) &
                / ABS(MudSystemDotXend_PipeSection(St_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(St_Mud_Backhead_section%Array(MudSystemDotimud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystemDotSt_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotDirectionCoef* (MudSystemDotXend_PipeSection(St_Mud_Backhead_section%Array(MudSystemDotimud))- MudSystemDotSt_Mud_Backhead_X%Array(MudSystemDotimud))* &
                MudSystemDotArea_PipeSectionFt(St_Mud_Backhead_section%Array(MudSystemDotimud)) !(ft^3)          
            MudSystemDotSt_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotSt_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)* 7.48051948d0       ! ft^3  to gal
            
            if ( MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud) <= MudSystemDotSt_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)) then
                St_Mud_Forehead_section%Array(MudSystemDotimud)= St_Mud_Backhead_section%Array(MudSystemDotimud)
                MudSystemDotSt_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotSt_Mud_Backhead_X%Array(MudSystemDotimud)+ MudSystemDotDirectionCoef*(MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud)/7.48051948d0)/MudSystemDotArea_PipeSectionFt(St_Mud_Backhead_section%Array(MudSystemDotimud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                MudSystemDotisection= St_Mud_Backhead_section%Array(MudSystemDotimud)+1
                MudSystemDotSt_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud)- MudSystemDotSt_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)
                    
                do 
                        if (MudSystemDotisection > F_StringIntervalCounts) then        ! last pipe section(string exit)
                            MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud)- MudSystemDotSt_RemainedVolume_in_LastSection%Array(MudSystemDotimud)
                            MudSystemDotSt_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotXend_PipeSection(F_StringIntervalCounts)
                            St_Mud_Forehead_section%Array(MudSystemDotimud)= F_StringIntervalCounts
                            
                            if (MudSystemDotSt_MudDischarged_Volume%Array(MudSystemDotimud)<= 0.0d0)  then       ! imud is completely exited form the string
                                call RemoveStringMudArrays(MudSystemDotimud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystemDotxx= MudSystemDotSt_RemainedVolume_in_LastSection%Array(MudSystemDotimud)/ MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)   !(gal)
                        
                    if (MudSystemDotxx<= 1.0) then
                        St_Mud_Forehead_section%Array(MudSystemDotimud)= MudSystemDotisection
                        MudSystemDotSt_Mud_Forehead_X%Array(MudSystemDotimud)= (MudSystemDotxx * (MudSystemDotXend_PipeSection(MudSystemDotisection)- MudSystemDotXstart_PipeSection(MudSystemDotisection)))+ MudSystemDotXstart_PipeSection(MudSystemDotisection)
                        exit
                    else
                        MudSystemDotSt_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotSt_RemainedVolume_in_LastSection%Array(MudSystemDotimud)- MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)
                        MudSystemDotisection= MudSystemDotisection+ 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
        MudSystemDotiLoc=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 (MudSystemDotiLoc==2 .and.  sum(MudSystemDotOp_MudDischarged_Volume%Array(:))+((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline)+MudSystemDotAnn_MudDischarged_Volume%First() < sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))  ) then
        MudSystemDotiLoc = 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 ( MudSystemDotMudVolume_InjectedToBH > 0.0 ) then 
            
            
                if (KickOffBottom) then                         ! (kickOffBottom = F) means kick is next to the bottom hole and usually kick is entering the
                    AddLocation= MudSystemDotOp_Density%Length()-MudSystemDotiLoc+1+1    ! well, thus pumped mud should be placed above the kick
                else
                    AddLocation= MudSystemDotOp_Density%Length()+1
                endif
 !write(*,*) 'AddLocation====' , AddLocation
                if ( AddLocation== 0)      CALL ErrorStop ('AddLocation=0')
 
                
                if ( ABS(St_Density%Last() - MudSystemDotOp_Density%Array(AddLocation-1)) >= MudSystemDotDensityMixTol ) then
                    !write(*,*) 'new pocket**'
                    !write(*,*) 'St_Density%Last()=' , St_Density%Last()
                    !write(*,*) 'Op_Density%Array(AddLocation-1)=' , Op_Density%Array(AddLocation-1)
                    

                    call MudSystemDotOp_Density% AddTo (AddLocation,St_Density%Last())
                    !call Op_MudDischarged_Volume%AddTo (AddLocation,((AnnulusFlowRate/60.d0)*DeltaT_Mudline))
                    call MudSystemDotOp_MudDischarged_Volume%AddTo (AddLocation,MudSystemDotMudVolume_InjectedToBH)
                    call MudSystemDotOp_Mud_Forehead_X%AddTo (AddLocation,MudSystemDotXstart_OpSection(1))
                    call Op_Mud_Forehead_section%AddTo (AddLocation,1)
                    call MudSystemDotOp_Mud_Backhead_X%AddTo (AddLocation,MudSystemDotXstart_OpSection(1))
                    call Op_Mud_Backhead_section%AddTo (AddLocation,1)
                    call MudSystemDotOp_RemainedVolume_in_LastSection%AddTo (AddLocation,0.0d0)
                    call MudSystemDotOp_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)
                    
                    MudSystemDotOp_Density%Array(AddLocation-1)= (MudSystemDotOp_Density%Array(AddLocation-1)*MudSystemDotOp_MudDischarged_Volume%Array(AddLocation-1)+St_Density%Last()*MudSystemDotMudVolume_InjectedToBH)/(MudSystemDotOp_MudDischarged_Volume%Array(AddLocation-1)+MudSystemDotMudVolume_InjectedToBH)
                    MudSystemDotOp_MudDischarged_Volume%Array(AddLocation-1)= MudSystemDotOp_MudDischarged_Volume%Array(AddLocation-1) + MudSystemDotMudVolume_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    
    MudSystemDotOpMudVolumeSum= 0.d0
    !Op_MudSaved_Density= 0.d0
    !Op_KickSaved_Density= 0.d0
    MudSystemDotOp_Saved_MudDischarged_Volume= 0.d0
    MudSystemDotOp_Kick_Saved_Volume= 0.d0
    MudSystemDotSaved_Op_MudOrKick= 0
    MudSystemDotOp_NeededVolume_ToFill= 0.d0
    
    
    
    
    do MudSystemDotimud=1, MudSystemDotOp_MudDischarged_Volume%Length()
        
            MudSystemDotOpMudVolumeSum= MudSystemDotOpMudVolumeSum + MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud)
        
        if ( MudSystemDotOpMudVolumeSum > sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) ) then !1st mode
            
            IF (Op_MudOrKick%Array(MudSystemDotimud) == 0) THEN
                MudSystemDotOp_MudSaved_Density = MudSystemDotOp_Density%Array(MudSystemDotimud)
                MudSystemDotOp_Saved_MudDischarged_Volume = MudSystemDotOpMudVolumeSum - sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))
            ELSE
                
                MudSystemDotOp_Kick_Saved_Volume = MudSystemDotOpMudVolumeSum - sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))
                MudSystemDotSaved_Op_MudOrKick= Op_MudOrKick%Array (MudSystemDotimud)
                MudSystemDotOp_KickSaved_Density= MudSystemDotOp_Density%Array(MudSystemDotimud)
                MudSystemDotiLoc= 2
                iloc_changedTo2= 2
            END IF
            
            do ii= MudSystemDotimud + 1, MudSystemDotOp_MudDischarged_Volume%Length()
                IF (Op_MudOrKick%Array(ii) == 0) THEN
                    MudSystemDotOp_MudSaved_Density = ((MudSystemDotOp_MudSaved_Density * MudSystemDotOp_Saved_MudDischarged_Volume) + (MudSystemDotOp_Density%Array(ii) * MudSystemDotOp_MudDischarged_Volume%Array(ii))) / (MudSystemDotOp_Saved_MudDischarged_Volume + MudSystemDotOp_MudDischarged_Volume%Array(ii))
                    MudSystemDotOp_Saved_MudDischarged_Volume = MudSystemDotOp_Saved_MudDischarged_Volume + MudSystemDotOp_MudDischarged_Volume%Array(ii)
                ELSE
                    MudSystemDotOp_Kick_Saved_Volume = MudSystemDotOp_Kick_Saved_Volume + MudSystemDotOp_MudDischarged_Volume%Array(ii)
                    MudSystemDotSaved_Op_MudOrKick= Op_MudOrKick%Array (ii)
                    MudSystemDotOp_KickSaved_Density= MudSystemDotOp_Density%Array(ii)
                    MudSystemDotiLoc= 2
                    iloc_changedTo2= 3
                END IF
            enddo
            
            exit ! exits do
            
        endif
        
    enddo
        
        if ( sum(MudSystemDotOp_MudDischarged_Volume%Array(:)) < sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) ) then !2nd & 3rd mode
            
            MudSystemDotOp_NeededVolume_ToFill= sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts)) - sum(MudSystemDotOp_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 ( (MudSystemDotOp_Kick_Saved_Volume > 0.0 .or. MudSystemDotOp_Saved_MudDischarged_Volume> 0.0) .or.  &     ! 1st Mode-Pump flow is more than trip out so fluid Level in Annulus Increases
        (MudSystemDotOp_NeededVolume_ToFill < ABS(MudSystemDotDeltaVolumeAnnulusCapacity)) ) 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 ( MudSystemDotOp_NeededVolume_ToFill > 0.0 .and. MudSystemDotOp_NeededVolume_ToFill < ABS(MudSystemDotDeltaVolumeAnnulusCapacity) )  then
         !   write(*,*) 'trip out 3rd mode'
            
            MudSystemDotNewVolume= 0.d0 ! for condition iloc=1
            
            SavedDensityForOp= Ann_Density%Array(1)
          
            ExcessMudVolume_Remained= MudSystemDotOp_NeededVolume_ToFill      
          
            
            MudSystemDotimud=1
           
            Do
                
                if(MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud) < ExcessMudVolume_Remained) then
                    ExcessMudVolume_Remained= ExcessMudVolume_Remained- MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)
                    call MudSystemDotAnn_MudDischarged_Volume%Remove (MudSystemDotimud)
                    call Ann_Mud_Backhead_X%Remove (MudSystemDotimud)
                    call Ann_Mud_Backhead_section%Remove (MudSystemDotimud)
                    call Ann_Mud_Forehead_X%Remove (MudSystemDotimud)
                    call Ann_Mud_Forehead_section%Remove (MudSystemDotimud)
                    call Ann_Density%Remove (MudSystemDotimud)
                    call Ann_RemainedVolume_in_LastSection%Remove (MudSystemDotimud)
                    call Ann_EmptyVolume_inBackheadLocation%Remove (MudSystemDotimud)
                    call Ann_MudOrKick%Remove (MudSystemDotimud)  
                    
                elseif(MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud) > ExcessMudVolume_Remained) then
                    MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)- ExcessMudVolume_Remained
                    exit
                    
                else    !(Ann_MudDischarged_Volume%Array(imud) == ExcessMudVolume_Remained) 
                    call MudSystemDotAnn_MudDischarged_Volume%Remove (MudSystemDotimud)
                    call Ann_Mud_Backhead_X%Remove (MudSystemDotimud)
                    call Ann_Mud_Backhead_section%Remove (MudSystemDotimud)
                    call Ann_Mud_Forehead_X%Remove (MudSystemDotimud)
                    call Ann_Mud_Forehead_section%Remove (MudSystemDotimud)
                    call Ann_Density%Remove (MudSystemDotimud)
                    call Ann_RemainedVolume_in_LastSection%Remove (MudSystemDotimud)
                    call Ann_EmptyVolume_inBackheadLocation%Remove (MudSystemDotimud)
                    call Ann_MudOrKick%Remove (MudSystemDotimud) 
                    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
        MudSystemDotMudSection= F_StringIntervalCounts+1
        MudSystemDotBackheadX= MudSystemDotXstart_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)= MudSystemDotMudSection !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)= MudSystemDotBackheadX
         
         
         
                !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 (MudSystemDotOp_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() == 0) then   !1st Mode
                    write(*,*) 'Kick influx enters Annulus'
                    call Ann_Density%AddToFirst (MudSystemDotOp_KickSaved_Density)
                    call MudSystemDotAnn_MudDischarged_Volume%AddToFirst (MudSystemDotOp_Kick_Saved_Volume)
                    call Ann_Mud_Forehead_X%AddToFirst (MudSystemDotXstart_PipeSection(F_StringIntervalCounts+1))
                    call Ann_Mud_Forehead_section%AddToFirst (F_StringIntervalCounts+1)
                    call Ann_Mud_Backhead_X%AddToFirst (MudSystemDotXstart_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 (MudSystemDotSaved_Op_MudOrKick)      !<<<<<<<<
                    call Ann_CuttingMud%AddToFirst (0)
                elseif (MudSystemDotOp_Kick_Saved_Volume > 0.0 .and. Ann_MudOrKick%First() /= 0) then
                    MudSystemDotAnn_MudDischarged_Volume%Array(1)= MudSystemDotAnn_MudDischarged_Volume%Array(1) + MudSystemDotOp_Kick_Saved_Volume
                endif
 

  
       if ( MudSystemDotOp_NeededVolume_ToFill > 0.0 .and. (MudSystemDotOp_NeededVolume_ToFill < ABS(MudSystemDotDeltaVolumeAnnulusCapacity)) .and. Op_MudOrKick%Last() == 0 .and. (MudSystemDotiLoc==2 .or. iloc_edited==1)) then   !3rd Mode               
                !write(*,*) 'checkpoint 0'
           !! for avoid kick separation -Op_MudOrKick%Last() == 0: because of pump
                    MudSystemDotNewVolume= ((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) ! =volume that should be added to iloc=2 in Ann
                    call RemoveOpMudArrays(MudSystemDotOp_Density%Length()) ! mud here is removed and then will be added to iloc=2 in Ann in %%1 section
                    if ( MudSystemDotAnn_MudDischarged_Volume%Array(1) > ((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) ) then! 1st in Ann = kick ,, we expect: ((AnnulusFlowRate/60.d0)*DeltaT_Mudline)= OpMudVolLast
                        MudSystemDotAnn_MudDischarged_Volume%Array(1)= MudSystemDotAnn_MudDischarged_Volume%Array(1) - ((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline)
                        MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())= MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())+ ((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline)   ! kick
                    else
                        call RemoveAnnulusMudArrays(1)  !kick is removed
                        MudSystemDotiLoc= 1
                        MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())= MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())+ ((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline)
                        write(*,*) 'little expand'
                        ! including  a little expand
                    endif
        endif  
                
        if (MudSystemDotOp_Saved_MudDischarged_Volume> 0.0) then   !1st Mode 
            NewDensity= MudSystemDotOp_MudSaved_Density
            !write(*,*) 'iloc,...' , iloc,((AnnulusFlowRate/60.d0)*DeltaT_Mudline),Op_Saved_MudDischarged_Volume
            if (MudSystemDotiLoc==1) then
                !write(*,*) 'checkpoint 1'
                MudSystemDotNewVolume= MudSystemDotOp_Saved_MudDischarged_Volume
            elseif (real(((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline)) - real(MudSystemDotOp_Saved_MudDischarged_Volume) > 0.d0 ) then                   ! for avoid kick separation
                !write(*,*) 'checkpoint 2'
                MudSystemDotNewVolume= ((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) !- Op_Saved_MudDischarged_Volume
                call RemoveOpMudArrays(MudSystemDotOp_Density%Length()) ! mud here is removed and then will be added to iloc=2 in Ann
                if ( MudSystemDotAnn_MudDischarged_Volume%Array(1) > (((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) - MudSystemDotOp_Saved_MudDischarged_Volume) ) then! 1st in Ann = kick
                    MudSystemDotAnn_MudDischarged_Volume%Array(1)= MudSystemDotAnn_MudDischarged_Volume%Array(1) - (((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) - MudSystemDotOp_Saved_MudDischarged_Volume)
                    MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())= MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())+ (((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) - MudSystemDotOp_Saved_MudDischarged_Volume)  !kick
                else
                    call RemoveAnnulusMudArrays(1)  !kick is removed
                    MudSystemDotiLoc =1
                    MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())= MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotOp_Density%Length())+ (((MudSystemDotAnnulusFlowRate/60.d0)*DeltaT_Mudline) - MudSystemDotOp_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'
               MudSystemDotNewVolume= MudSystemDotOp_Saved_MudDischarged_Volume ! it is normal mode
            endif
            
            
        endif
        
                !write(*,*) 'NewVolume=' ,NewVolume
                

        if( Ann_Density%Length() == 1 .and. MudSystemDotiLoc ==2 ) then
            
        write(*,*) '***errorb****=='
        
        write(*,*) 'iloc_edited=' , iloc_edited
        write(*,*) 'iloc_changedTo2=' , iloc_changedTo2
        
        write(*,*) 'Op_Capacity===' , sum(MudSystemDotOpSection_VolumeCapacity(1:F_BottomHoleIntervalCounts))
        
         WRITE (*,*) 'Op_Saved_MudDischarged_Volume, Op_Kick_Saved_Volume',MudSystemDotOp_Saved_MudDischarged_Volume, MudSystemDotOp_Kick_Saved_Volume
        
        do MudSystemDotimud=1, MudSystemDotOp_MudDischarged_Volume%Length()
            write(*,*) 'Op:', MudSystemDotimud, MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud), MudSystemDotOp_Density%Array(MudSystemDotimud) ,Op_MudOrKick%Array(MudSystemDotimud)
        enddo             
        
        do MudSystemDotimud=1, MudSystemDotAnn_MudDischarged_Volume%Length()
            write(*,*) 'Ann:', MudSystemDotimud, MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud), Ann_Density%Array(MudSystemDotimud) ,Ann_MudOrKick%Array(MudSystemDotimud)
        enddo
        
     
    
        write(*,*) '==***errorb****'
        endif        
        
        
        
        
                
                if ((Rate_of_Penetration==0 .and. abs(Ann_Density%Array(MudSystemDotiLoc)-NewDensity)< MudSystemDotDensityMixTol) &     !%%1 section
                .or. (Rate_of_Penetration>0. .and. Ann_CuttingMud%Array(MudSystemDotiLoc)==1 .and. abs(Ann_Density%Array(MudSystemDotiLoc)-NewDensity)< MudSystemDotCuttingDensityMixTol) &
                .or. (Rate_of_Penetration>0. .and. Ann_CuttingMud%Array(MudSystemDotiLoc)==0 .and. MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc) < 42.) ) then   ! 1-Pockets are Merged
                 !write(*,*) '%%1 section a)'
                    Ann_Density%Array(MudSystemDotiLoc)= (Ann_Density%Array(MudSystemDotiLoc)*MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)+NewDensity*MudSystemDotNewVolume)/(MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)+MudSystemDotNewVolume)
                    MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)+MudSystemDotNewVolume
                    Ann_Mud_Forehead_X%Array(MudSystemDotiLoc)= MudSystemDotBackheadX
                    Ann_Mud_Forehead_section%Array(MudSystemDotiLoc)= MudSystemDotMudSection
                    Ann_Mud_Backhead_X%Array(MudSystemDotiLoc)= MudSystemDotBackheadX
                    Ann_Mud_Backhead_section%Array(MudSystemDotiLoc)= MudSystemDotMudSection
                    Ann_RemainedVolume_in_LastSection%Array(MudSystemDotiLoc)= (0.0d0)
                    Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotiLoc)= (0.0d0)                    
                else       ! 2-Merging conditions are not meeted, so new pocket
                 !write(*,*) '%%1 section b)'
                    
                    call Ann_Density%AddTo (MudSystemDotiLoc,NewDensity)
                    call MudSystemDotAnn_MudDischarged_Volume%AddTo (MudSystemDotiLoc,MudSystemDotNewVolume)
                    call Ann_Mud_Forehead_X%AddTo (MudSystemDotiLoc,MudSystemDotBackheadX)
                    call Ann_Mud_Forehead_section%AddTo (MudSystemDotiLoc,MudSystemDotMudSection)
                    call Ann_Mud_Backhead_X%AddTo (MudSystemDotiLoc,MudSystemDotBackheadX)
                    call Ann_Mud_Backhead_section%AddTo (MudSystemDotiLoc,MudSystemDotMudSection)
                    call Ann_RemainedVolume_in_LastSection%AddTo (MudSystemDotiLoc,0.0d0)
                    call Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystemDotiLoc,0.0d0)
                    call Ann_MudOrKick%AddTo (MudSystemDotiLoc,0)
                    call Ann_CuttingMud%AddTo (MudSystemDotiLoc,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
    MudSystemDotAnnMudVolumeSum= 0.d0
    !Ann_MudSaved_Density= 0.d0
    !Ann_KickSaved_Density= 0.d0
    MudSystemDotAnn_Saved_MudDischarged_Volume= 0.d0
    MudSystemDotAnn_Kick_Saved_Volume= 0.d0
    MudSystemDotSaved_Ann_MudOrKick= 0
    MudSystemDotAnn_to_Choke_2mud= .false.
    
    
    
    
    do MudSystemDotimud=1, MudSystemDotAnn_MudDischarged_Volume%Length()
        
            MudSystemDotAnnMudVolumeSum= MudSystemDotAnnMudVolumeSum + MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)
        
        if ( MudSystemDotAnnMudVolumeSum > sum(MudSystemDotPipeSection_VolumeCapacity(F_StringIntervalCounts+1:MudSystemDotNoPipeSections)) ) then
            
            IF (Ann_MudOrKick%Array(MudSystemDotimud) == 0) THEN
                MudSystemDotAnn_MudSaved_Density = Ann_Density%Array(MudSystemDotimud)
                MudSystemDotAnn_Saved_MudDischarged_Volume = MudSystemDotAnnMudVolumeSum - sum(MudSystemDotPipeSection_VolumeCapacity(F_StringIntervalCounts+1:MudSystemDotNoPipeSections))
            ELSEIF (Ann_MudOrKick%Array(MudSystemDotimud) > 0 .AND. Ann_MudOrKick%Array(MudSystemDotimud) <100) THEN        ! 104= AIR
                MudSystemDotAnn_Kick_Saved_Volume = MudSystemDotAnnMudVolumeSum - sum(MudSystemDotPipeSection_VolumeCapacity(F_StringIntervalCounts+1:MudSystemDotNoPipeSections))
                MudSystemDotSaved_Ann_MudOrKick= Ann_MudOrKick%Array (MudSystemDotimud)
                MudSystemDotAnn_KickSaved_Density= Ann_Density%Array(MudSystemDotimud)
            END IF
            
            do ii= MudSystemDotimud + 1, MudSystemDotAnn_MudDischarged_Volume%Length()
                IF (Ann_MudOrKick%Array(ii) == 0) THEN
                    MudSystemDotAnn_MudSaved_Density = ((MudSystemDotAnn_MudSaved_Density * MudSystemDotAnn_Saved_MudDischarged_Volume) + (Ann_Density%Array(ii) * MudSystemDotAnn_MudDischarged_Volume%Array(ii))) / (MudSystemDotAnn_Saved_MudDischarged_Volume + MudSystemDotAnn_MudDischarged_Volume%Array(ii))
                    MudSystemDotAnn_Saved_MudDischarged_Volume = MudSystemDotAnn_Saved_MudDischarged_Volume + MudSystemDotAnn_MudDischarged_Volume%Array(ii)
                    MudSystemDotAnn_to_Choke_2mud= .true.
                ELSEIF (Ann_MudOrKick%Array(ii) > 0 .AND. Ann_MudOrKick%Array(ii) <100) THEN        ! 104= AIR
                    MudSystemDotAnn_Kick_Saved_Volume = MudSystemDotAnn_Kick_Saved_Volume + MudSystemDotAnn_MudDischarged_Volume%Array(ii)
                    MudSystemDotSaved_Ann_MudOrKick= Ann_MudOrKick%Array (ii)
                    MudSystemDotAnn_KickSaved_Density= Ann_Density%Array(ii)
                END IF
            enddo
            
            exit ! exits do
            
        endif
        
    enddo
    
MudSystemDotAnn_Saved_MudDischarged_Volume_Final= MudSystemDotAnn_Saved_MudDischarged_Volume
MudSystemDotAnn_Kick_Saved_Volume_Final= MudSystemDotAnn_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 = MudSystemDotAnn_Saved_MudDischarged_Volume_Final-((MudSystemDotQlost/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.          
         
MudSystemDotimud= 0

    do while (MudSystemDotimud < Ann_Mud_Forehead_X%Length())
        MudSystemDotimud = MudSystemDotimud + 1
        
            if (MudSystemDotimud> 1) then
                Ann_Mud_Backhead_X%Array(MudSystemDotimud)= Ann_Mud_Forehead_X%Array(MudSystemDotimud-1)
                Ann_Mud_Backhead_section%Array(MudSystemDotimud)= Ann_Mud_Forehead_section%Array(MudSystemDotimud-1)
            endif
            
            !    write(*,*) 'imud==' , imud
            !write(*,*) '***)Ann_Mud_Backhead_section(imud)= ' , Ann_Mud_Backhead_section%Array(imud), Ann_density%Array(imud)
                
                
            MudSystemDotDirectionCoef= (MudSystemDotXend_PipeSection(Ann_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(Ann_Mud_Backhead_section%Array(MudSystemDotimud))) &
                / ABS(MudSystemDotXend_PipeSection(Ann_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(Ann_Mud_Backhead_section%Array(MudSystemDotimud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotDirectionCoef* (MudSystemDotXend_PipeSection(Ann_Mud_Backhead_section%Array(MudSystemDotimud))- Ann_Mud_Backhead_X%Array(MudSystemDotimud))* &
                MudSystemDotArea_PipeSectionFt(Ann_Mud_Backhead_section%Array(MudSystemDotimud)) !(ft^3)          
            Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)* 7.48051948d0        ! ft^3  to gal
            
         
            if ( MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud) <= Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)) then
                Ann_Mud_Forehead_section%Array(MudSystemDotimud)= Ann_Mud_Backhead_section%Array(MudSystemDotimud)
                Ann_Mud_Forehead_X%Array(MudSystemDotimud)= Ann_Mud_Backhead_X%Array(MudSystemDotimud)+ MudSystemDotDirectionCoef*(MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)/7.48051948d0)/MudSystemDotArea_PipeSectionFt(Ann_Mud_Backhead_section%Array(MudSystemDotimud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                MudSystemDotisection= Ann_Mud_Backhead_section%Array(MudSystemDotimud)+1
                Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)- Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)
                    
                do 
                        if (MudSystemDotisection > MudSystemDotNoPipeSections) then        ! last pipe section(well exit)
                            MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)- Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)
                            Ann_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotXend_PipeSection(MudSystemDotNoPipeSections)
                            Ann_Mud_Forehead_section%Array(MudSystemDotimud)= MudSystemDotNoPipeSections
                                
                            if (MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)<= 0.0d0)  then       ! imud is completely exited form the well
                                call RemoveAnnulusMudArrays(MudSystemDotimud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystemDotxx= Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)/ MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)   !(gal)
                        
                    if (MudSystemDotxx<= 1.0) then
                        Ann_Mud_Forehead_section%Array(MudSystemDotimud)= MudSystemDotisection
                        Ann_Mud_Forehead_X%Array(MudSystemDotimud)= (MudSystemDotxx * (MudSystemDotXend_PipeSection(MudSystemDotisection)- MudSystemDotXstart_PipeSection(MudSystemDotisection)))+ MudSystemDotXstart_PipeSection(MudSystemDotisection)
                        exit
                    else
                        Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)- MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)
                        MudSystemDotisection= MudSystemDotisection+ 1
                                
                    endif

                enddo
            
            endif         
     
    enddo
    
            if (Ann_Mud_Forehead_X%Last() < MudSystemDotXend_PipeSection(MudSystemDotNoPipeSections)) then
                Ann_Mud_Forehead_X%Array(Ann_Mud_Forehead_X%Length()) = MudSystemDotXend_PipeSection(MudSystemDotNoPipeSections)       ! for error preventing
            endif    
    
!========================ANNULUS END================= 


    
!*************************************************************************************************************************                    
    
!========================Tripping Out- 2nd Mode====================
    
    
        elseif ( MudSystemDotOp_NeededVolume_ToFill > ABS(MudSystemDotDeltaVolumeAnnulusCapacity) ) 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 MudSystemDotAnn_MudDischarged_Volume%Add (0.0d0)
                    call Ann_Mud_Forehead_X%Add (MudSystemDotXend_PipeSection(MudSystemDotNoPipeSections))
                    call Ann_Mud_Forehead_section%Add (MudSystemDotNoPipeSections)
                    call Ann_Mud_Backhead_X%Add (MudSystemDotXstart_PipeSection(MudSystemDotNoPipeSections))
                    call Ann_Mud_Backhead_section%Add (MudSystemDotNoPipeSections)
                    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())= MudSystemDotNoPipeSections !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())= MudSystemDotXend_PipeSection(MudSystemDotNoPipeSections)
               
         
         MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotAnn_MudDischarged_Volume%Length())= MudSystemDotAnn_MudDischarged_Volume%Last()+ (MudSystemDotOp_NeededVolume_ToFill - ABS(MudSystemDotDeltaVolumeAnnulusCapacity))  !  Op_NeededVolume_ToFill !ABS(DeltaVolumePipe) - ((AnnulusFlowRate/60.)*DeltaT_Mudline)    !(gal)                    

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

      

                if ( (MudSystemDotiLoc==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(MudSystemDotiLoc)-MudSystemDotOp_Density%Last())< MudSystemDotDensityMixTol) then
                    
                        Ann_Density%Array(MudSystemDotiLoc)= (Ann_Density%Array(MudSystemDotiLoc)*MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)+MudSystemDotOp_Density%Last()*MudSystemDotOp_MudDischarged_Volume%Last())/(MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)+MudSystemDotOp_MudDischarged_Volume%Last())
                        MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotiLoc)+MudSystemDotOp_MudDischarged_Volume%Last()   ! OP_Last is mud(effect of pump added mud)
                        Ann_Mud_Forehead_X%Array(MudSystemDotiLoc)= MudSystemDotBackheadX
                        Ann_Mud_Forehead_section%Array(MudSystemDotiLoc)= MudSystemDotMudSection
                        Ann_Mud_Backhead_X%Array(MudSystemDotiLoc)= MudSystemDotBackheadX
                        Ann_Mud_Backhead_section%Array(MudSystemDotiLoc)= MudSystemDotMudSection
                        Ann_RemainedVolume_in_LastSection%Array(MudSystemDotiLoc)= (0.0d0)
                        Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotiLoc)= (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 (MudSystemDotiLoc,MudSystemDotOp_Density%Last())
                        call MudSystemDotAnn_MudDischarged_Volume%AddTo (MudSystemDotiLoc,MudSystemDotOp_MudDischarged_Volume%Last())
                        call Ann_Mud_Forehead_X%AddTo (MudSystemDotiLoc,MudSystemDotBackheadX)
                        call Ann_Mud_Forehead_section%AddTo (MudSystemDotiLoc,MudSystemDotMudSection)
                        call Ann_Mud_Backhead_X%AddTo (MudSystemDotiLoc,MudSystemDotBackheadX)
                        call Ann_Mud_Backhead_section%AddTo (MudSystemDotiLoc,MudSystemDotMudSection)
                        call Ann_RemainedVolume_in_LastSection%AddTo (MudSystemDotiLoc,0.0d0)
                        call Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystemDotiLoc,0.0d0)
                        call Ann_MudOrKick%AddTo (MudSystemDotiLoc,0)
                        call Ann_CuttingMud%AddTo (MudSystemDotiLoc,0)
                    endif
                    
                    MudSystemDotOp_NeededVolume_ToFill= MudSystemDotOp_NeededVolume_ToFill + MudSystemDotOp_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
    MudSystemDotAnn_Saved_MudDischarged_Volume= 0.d0
    MudSystemDotAnn_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'      
    
    
    
    
    
MudSystemDotAnn_Saved_MudDischarged_Volume_Final= MudSystemDotAnn_Saved_MudDischarged_Volume
MudSystemDotAnn_Kick_Saved_Volume_Final= MudSystemDotAnn_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 = MudSystemDotAnn_Saved_MudDischarged_Volume_Final-((MudSystemDotQlost/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()
MudSystemDotimud= Ann_Mud_Forehead_X%Length() + 1

    do while (MudSystemDotimud > 1)
        MudSystemDotimud = MudSystemDotimud - 1 
        
            if (MudSystemDotimud< Ann_Mud_Forehead_X%Length()) then
                Ann_Mud_Forehead_X%Array(MudSystemDotimud)= Ann_Mud_Backhead_X%Array(MudSystemDotimud+1)
                Ann_Mud_Forehead_section%Array(MudSystemDotimud)= Ann_Mud_Backhead_section%Array(MudSystemDotimud+1)
            endif
  
            
!       <<< Fracture Shoe Lost            
            IF ( MudSystemDotShoeLost .and. Shoe%ShoeDepth < Ann_Mud_Backhead_X%Array(MudSystemDotimud) .and. Shoe%ShoeDepth >= Ann_Mud_Forehead_X%Array(MudSystemDotimud) ) then
                !write(*,*) 'ShoeLost   imud,AnnVolume(imud), VolumeLost:' , imud,Ann_MudDischarged_Volume%Array(imud), (( Qlost/60.0d0)*DeltaT_Mudline)
                MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)-((MudSystemDotQlost/60.0d0)*DeltaT_Mudline)    !(gal)
                if (MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud) < 0.0) then
                    !write(*,*) 'mud is removed by shoe lost, imud=' , imud
                    call RemoveAnnulusMudArrays(MudSystemDotimud)
                    MudSystemDotimud= MudSystemDotimud-1
                    cycle
                endif
               MudSystemDotLostInTripOutIsDone= .true. 
            ENDIF
!           Fracture Shoe Lost >>>              
            
            
            
            
            
            
            
            
            !write(*,*) 'a)imud,Ann_Mud_Forehead_section=',imud,Ann_Mud_Forehead_section%Array(imud)
                
            MudSystemDotDirectionCoef= (MudSystemDotXend_PipeSection(Ann_Mud_Forehead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(Ann_Mud_Forehead_section%Array(MudSystemDotimud))) &
                / ABS(MudSystemDotXend_PipeSection(Ann_Mud_Forehead_section%Array(MudSystemDotimud))-MudSystemDotXstart_PipeSection(Ann_Mud_Forehead_section%Array(MudSystemDotimud)))
            ! +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(MudSystemDotimud)= MudSystemDotDirectionCoef* (Ann_Mud_Forehead_X%Array(MudSystemDotimud)- MudSystemDotXstart_PipeSection(Ann_Mud_Forehead_section%Array(MudSystemDotimud)))* &
                MudSystemDotArea_PipeSectionFt(Ann_Mud_Forehead_section%Array(MudSystemDotimud)) !(ft^3)  
            Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)* 7.48051948d0        ! ft^3  to gal

            if ( MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud) <= Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)) then
                Ann_Mud_Backhead_section%Array(MudSystemDotimud)= Ann_Mud_Forehead_section%Array(MudSystemDotimud)
                Ann_Mud_Backhead_X%Array(MudSystemDotimud)= Ann_Mud_Forehead_X%Array(MudSystemDotimud)- MudSystemDotDirectionCoef*(MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)/7.48051948d0)/MudSystemDotArea_PipeSectionFt(Ann_Mud_Forehead_section%Array(MudSystemDotimud))
                                                                            !   7.48051948 is for gal to ft^3
            else   
                MudSystemDotisection= Ann_Mud_Forehead_section%Array(MudSystemDotimud)-1
                Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)- Ann_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)
                
                do 
                        if (MudSystemDotisection < F_StringIntervalCounts+1) then        ! last pipe section(well exit) F_StringIntervalCounts+1 is the first section in Annulus
                            MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)- Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)
                            Ann_Mud_Backhead_X%Array(MudSystemDotimud)= MudSystemDotXstart_PipeSection(F_StringIntervalCounts+1)
                            Ann_Mud_Backhead_section%Array(MudSystemDotimud)= F_StringIntervalCounts+1
                            
                            if (MudSystemDotAnn_MudDischarged_Volume%Array(MudSystemDotimud)<= 0.0d0)  then      ! imud is completely exited form the well
                                call RemoveAnnulusMudArrays(MudSystemDotimud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystemDotxx= Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)/ MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)   !(gal)
                        
                    if (MudSystemDotxx<= 1.0) then
                        Ann_Mud_Backhead_section%Array(MudSystemDotimud)= MudSystemDotisection
                        Ann_Mud_Backhead_X%Array(MudSystemDotimud)= (MudSystemDotxx * (MudSystemDotXstart_PipeSection(MudSystemDotisection)- MudSystemDotXend_PipeSection(MudSystemDotisection)))+ MudSystemDotXend_PipeSection(MudSystemDotisection)
                        exit
                    else
                        Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= Ann_RemainedVolume_in_LastSection%Array(MudSystemDotimud)- MudSystemDotPipeSection_VolumeCapacity(MudSystemDotisection)
                        MudSystemDotisection= MudSystemDotisection- 1
                        
                                
                    endif

                enddo
            
            endif   
          
    enddo
!========================ANNULUS END================= 
    
        endif       ! end of 1st &3rd & 2nd Mode
        
    
!*************************************************************************************************************************  
    
    


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

                if ( ABS(MudSystemDotOp_Density%Last() - SavedDensityForOp ) >= MudSystemDotDensityMixTol) then ! .OR. (Op_MudDischarged_Volume%Last()>42.) ) then           ! 1-Merging conditions are not meeted, so new pocket
                                
                call MudSystemDotOp_Density%Add (SavedDensityForOp)
                call MudSystemDotOp_MudDischarged_Volume%Add (MudSystemDotOp_NeededVolume_ToFill)
                call MudSystemDotOp_Mud_Forehead_X%Add (0.0d0)
                call Op_Mud_Forehead_section%Add (1)
                call MudSystemDotOp_Mud_Backhead_X%Add (0.0d0)
                call Op_Mud_Backhead_section%Add (1)
                call MudSystemDotOp_RemainedVolume_in_LastSection%Add (0.0d0)
                call MudSystemDotOp_EmptyVolume_inBackheadLocation%Add (0.0d0)
                call Op_MudOrKick%Add (Ann_MudOrKick%Array(1))
            else                                  ! 2-Pockets are Merged
          
                MudSystemDotOp_Density%Array (MudSystemDotOp_Density%Length())= (SavedDensityForOp*MudSystemDotOp_NeededVolume_ToFill+MudSystemDotOp_Density%Last()*MudSystemDotOp_MudDischarged_Volume%Last())/(MudSystemDotOp_MudDischarged_Volume%Last()+MudSystemDotOp_NeededVolume_ToFill)
                MudSystemDotOp_MudDischarged_Volume%Array (MudSystemDotOp_Density%Length())= MudSystemDotOp_MudDischarged_Volume%Array (MudSystemDotOp_Density%Length()) + MudSystemDotOp_NeededVolume_ToFill
                MudSystemDotOp_RemainedVolume_in_LastSection%Array (MudSystemDotOp_Density%Length())= 0.0
                MudSystemDotOp_EmptyVolume_inBackheadLocation%Array (MudSystemDotOp_Density%Length())= 0.0
                                
            endif                     

    endif
    


    
!============================= Bottom Hole ============================== 

MudSystemDotimud=0                     
    do while (MudSystemDotimud < MudSystemDotOp_Mud_Forehead_X%Length())
        MudSystemDotimud = MudSystemDotimud + 1
        
            if (MudSystemDotimud> 1) then
                MudSystemDotOp_Mud_Backhead_X%Array(MudSystemDotimud)= MudSystemDotOp_Mud_Forehead_X%Array(MudSystemDotimud-1)
                Op_Mud_Backhead_section%Array(MudSystemDotimud)= Op_Mud_Forehead_section%Array(MudSystemDotimud-1)
            endif
                
            MudSystemDotDirectionCoef= (MudSystemDotXend_OpSection(Op_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_OpSection(Op_Mud_Backhead_section%Array(MudSystemDotimud))) &
                / ABS(MudSystemDotXend_OpSection(Op_Mud_Backhead_section%Array(MudSystemDotimud))-MudSystemDotXstart_OpSection(Op_Mud_Backhead_section%Array(MudSystemDotimud)))
            ! +1 for string  ,   -1 for annulus
                
                           
                                                                                                                    
            MudSystemDotOp_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotDirectionCoef* (MudSystemDotXend_OpSection(Op_Mud_Backhead_section%Array(MudSystemDotimud))- MudSystemDotOp_Mud_Backhead_X%Array(MudSystemDotimud))* &
                MudSystemDotArea_OpSectionFt(Op_Mud_Backhead_section%Array(MudSystemDotimud)) !(ft^3)          
            MudSystemDotOp_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)= MudSystemDotOp_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)* 7.48051948d0        ! ft^3  to gal
            
         
            if ( MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud) <= MudSystemDotOp_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)) then
                Op_Mud_Forehead_section%Array(MudSystemDotimud)= Op_Mud_Backhead_section%Array(MudSystemDotimud)
                MudSystemDotOp_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotOp_Mud_Backhead_X%Array(MudSystemDotimud)+ MudSystemDotDirectionCoef*(MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud)/7.48051948d0)/MudSystemDotArea_OpSectionFt(Op_Mud_Backhead_section%Array(MudSystemDotimud))
                                                                            !   7.48051948 is for gal to ft^3
                
            else
                    
                MudSystemDotisection= Op_Mud_Backhead_section%Array(MudSystemDotimud)+1
                MudSystemDotOp_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud)- MudSystemDotOp_EmptyVolume_inBackheadLocation%Array(MudSystemDotimud)
                    
                do 
                        if (MudSystemDotisection > F_BottomHoleIntervalCounts) then        ! last pipe section(well exit)
                            !if( imud==1) KickDeltaVinAnnulus= Op_RemainedVolume_in_LastSection%Array(imud)      ! Kick enters Annulus space
                            MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud)= MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud)- MudSystemDotOp_RemainedVolume_in_LastSection%Array(MudSystemDotimud)
                            MudSystemDotOp_Mud_Forehead_X%Array(MudSystemDotimud)= MudSystemDotXend_OpSection(F_BottomHoleIntervalCounts)
                            Op_Mud_Forehead_section%Array(MudSystemDotimud)= F_BottomHoleIntervalCounts
                                
                            if (MudSystemDotOp_MudDischarged_Volume%Array(MudSystemDotimud)<= 0.0d0)  then     ! imud is completely exited form the well
                                call MudSystemDotOp_MudDischarged_Volume%Remove (MudSystemDotimud)
                                call MudSystemDotOp_Mud_Backhead_X%Remove (MudSystemDotimud)
                                call Op_Mud_Backhead_section%Remove (MudSystemDotimud)
                                call MudSystemDotOp_Mud_Forehead_X%Remove (MudSystemDotimud)
                                call Op_Mud_Forehead_section%Remove (MudSystemDotimud)
                                call MudSystemDotOp_Density%Remove (MudSystemDotimud)
                                call MudSystemDotOp_RemainedVolume_in_LastSection%Remove (MudSystemDotimud)
                                call MudSystemDotOp_EmptyVolume_inBackheadLocation%Remove (MudSystemDotimud)
                                call Op_MudOrKick%Remove (MudSystemDotimud) 
                                
                            endif
                            
                            exit
                        endif
                                 
                    MudSystemDotxx= MudSystemDotOp_RemainedVolume_in_LastSection%Array(MudSystemDotimud)/ MudSystemDotOpSection_VolumeCapacity(MudSystemDotisection)   !(gal)
                        
                    if (MudSystemDotxx<= 1.0) then
                        Op_Mud_Forehead_section%Array(MudSystemDotimud)= MudSystemDotisection
                        MudSystemDotOp_Mud_Forehead_X%Array(MudSystemDotimud)= (MudSystemDotxx * (MudSystemDotXend_OpSection(MudSystemDotisection)- MudSystemDotXstart_OpSection(MudSystemDotisection)))+ MudSystemDotXstart_OpSection(MudSystemDotisection)
                        exit
                    else
                        MudSystemDotOp_RemainedVolume_in_LastSection%Array(MudSystemDotimud)= MudSystemDotOp_RemainedVolume_in_LastSection%Array(MudSystemDotimud)- MudSystemDotOpSection_VolumeCapacity(MudSystemDotisection)
                        MudSystemDotisection= MudSystemDotisection+ 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'       

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


    end subroutine TripOut_and_Pump