SimulationCore2/Equipments/MudSystem/Utube1_and_Trip_In.f90

SUBROUTINE Utube1_and_TripIn    !  is called in subroutine CirculationCodeSelect        string to annulus
    
        Use UTUBEVARS
        Use GeoElements_FluidModule
        USE CMudPropertiesVariables
        USE MudSystemVARIABLES
        USE Pumps_VARIABLES
        USE sROP_Variables
        use CDrillWatchVariables
        !use CTanksVariables, TripTankVolume2 => DrillingWatch%TripTankVolume, TripTankDensity2 => TripTankDensity
        Use CShoeVariables
        Use CUnityOutputs
        
   implicit none
   
    write(*,*) 'Utube1 code'
!===========================================================WELL============================================================
!===========================================================WELL============================================================ 
        MudSystem%UtubeMode1Activated= .true.
        !write(*,*) 'QUTubeInput=' , QUTubeInput
        !Qinput=5000.
        MudSystem%StringFlowRate= QUTubeInput        ! (gpm)
        MudSystem%AnnulusFlowRate= QUTubeInput
        MudSystem%StringFlowRateFinal= MudSystem%StringFlowRate
        MudSystem%AnnulusFlowRateFinal= MudSystem%AnnulusFlowRate
!=========================================== 
       
        if (MudSystem%FirstSetUtube1==0) then
        !    call St_MudDischarged_Volume%AddToFirst (REAL(sum(F_Interval(1:F_StringIntervalCounts)%Volume)))  !startup initial
        !    call St_Mud_Backhead_X%AddToFirst (Xstart_PipeSection(1))
        !    call St_Mud_Backhead_section%AddToFirst (1)
        !    call St_Mud_Forehead_X%AddToFirst (Xend_PipeSection(F_StringIntervalCounts))
        !    call St_Mud_Forehead_section%AddToFirst (F_StringIntervalCounts)
        !    call MudSystem%St_Density%AddToFirst (REAL(ActiveDensity))       ! initial(ppg)
        !    call St_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
        !    call St_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
        !        
        !    call Ann_MudDischarged_Volume%AddToFirst (REAL(sum(F_Interval((F_StringIntervalCounts+F_BottomHoleIntervalCounts+1):F_IntervalsTotalCounts)%Volume)))  !startup initial
        !    call Ann_Mud_Backhead_X%AddToFirst (Xstart_PipeSection(F_StringIntervalCounts+1))
        !    call Ann_Mud_Backhead_section%AddToFirst (F_StringIntervalCounts+1)
        !    call Ann_Mud_Forehead_X%AddToFirst (Xend_PipeSection(NoPipeSections))
        !    call Ann_Mud_Forehead_section%AddToFirst (NoPipeSections)
        !    call Ann_Density%AddToFirst (REAL(ActiveDensity))       ! initial(ppg)
        !    call Ann_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
        !    call Ann_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
             !Hz_Density%Array(:)= 0.0      !commented
             !Hz_MudOrKick%Array(:)= 104      !commented
             
             MudSystem%Hz_Density_Utube= 0.0
             MudSystem%Hz_MudOrKick_Utube= 104             
        
            MudSystem%FirstSetUtube1= 1
        endif

        

        
!========================Horizontal PIPE ENTRANCE================= 
        
         !if (SuctionDensity_Old >= (ActiveDensity+0.05) .or. SuctionDensity_Old <= (ActiveDensity-0.05)) then     ! new mud is pumped
         !   !ImudCount= ImudCount+1
         !   !SuctionMud= ImudCount
         !   call Hz_Density%AddToFirst (REAL(ActiveDensity))     !ActiveDensity : badan in moteghayer bayad avaz beshe
         !   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= ActiveDensity
         !endif

!========================Horizontal PIPE STRING================= 

        !commented
        
!                Hz_MudDischarged_Volume%Array(1)= Hz_MudDischarged_Volume%Array(1)+ ((MudSystem%StringFlowRate/60.)*DeltaT_Mudline)    !(gal)
!         
!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)* 7.48051948        ! 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)/7.48051948)/Area_PipeSectionFt(Hz_Mud_Backhead_section%Array(imud))
!                                                                            !   7.48 is for gal to ft^3
!            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 Hz_MudDischarged_Volume%Remove (imud)
!                                call Hz_Mud_Backhead_X%Remove (imud)
!                                call Hz_Mud_Backhead_section%Remove (imud)
!                                call Hz_Mud_Forehead_X%Remove (imud)
!                                call Hz_Mud_Forehead_section%Remove (imud)
!                                call Hz_Density%Remove (imud)
!                                call Hz_RemainedVolume_in_LastSection%Remove (imud)
!                                call Hz_EmptyVolume_inBackheadLocation%Remove (imud)
!                                call Hz_MudOrKick%Remove (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
        
        !commented
        
!========================Horizontal PIPE END=================         
        
!========================STRING ENTRANCE================= 
        !write(*,*) 'a) MudSystem%St_Density%Length()=' , MudSystem%St_Density%Length()   
        
         if (ABS(MudSystem%St_Density%First() - MudSystem%Hz_Density_Utube) >= MudSystem%DensityMixTol) then     ! new mud is pumped
            call MudSystem%St_Density%AddToFirst (MudSystem%Hz_Density_Utube)
            call MudSystem%St_MudDischarged_Volume%AddToFirst (0.0d0)
            call MudSystem%St_Mud_Forehead_X%AddToFirst (MudSystem%Xstart_PipeSection(2))
            call MudSystem%St_Mud_Forehead_section%AddToFirst (2)
            call MudSystem%St_Mud_Backhead_X%AddToFirst (MudSystem%Xstart_PipeSection(2))
            call MudSystem%St_Mud_Backhead_section%AddToFirst (2)
            call MudSystem%St_RemainedVolume_in_LastSection%AddToFirst (0.0d0)
            call MudSystem%St_EmptyVolume_inBackheadLocation%AddToFirst (0.0d0)
            call MudSystem%St_MudOrKick%AddToFirst (MudSystem%Hz_MudOrKick_Utube)      ! Hz_MudOrKick%Last() = 104
             
             !StringDensity_Old= Hz_Density_Utube
         endif
        !write(*,*) 'b) MudSystem%St_Density%Length()=' , MudSystem%St_Density%Length() 
        !write(*,*) 'b) MudSystem%St_Density%Array(1)=' , MudSystem%St_Density%Array(1) 
        !write(*,*) 'b) St_MudOrKick%Array(1)=' , St_MudOrKick%Array(1) 
        

!========================STRING================= 
                !WRITE (*,*) 'Utube1 MudSystem%StringFlowRate', MudSystem%StringFlowRate
                MudSystem%St_MudDischarged_Volume%Array(1)= MudSystem%St_MudDischarged_Volume%Array(1)+ ((MudSystem%StringFlowRate/60.d0)*MudSystem%DeltaT_Mudline)    !(gal)
         
imud=0                               
    do while (imud < MudSystem%St_Mud_Forehead_X%Length())
        imud = imud + 1                
        
        
            if (imud> 1) then
                MudSystem%St_Mud_Backhead_X%Array(imud)= MudSystem%St_Mud_Forehead_X%Array(imud-1)
                MudSystem%St_Mud_Backhead_section%Array(imud)= MudSystem%St_Mud_Forehead_section%Array(imud-1)
            endif
 
            MudSystem%DirectionCoef= (MudSystem%Xend_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))) &
                / ABS(MudSystem%Xend_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                                                                                                                    
            MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Xend_PipeSection(MudSystem%St_Mud_Backhead_section%Array(imud))- MudSystem%St_Mud_Backhead_X%Array(imud))* &
                MudSystem%Area_PipeSectionFt(MudSystem%St_Mud_Backhead_section%Array(imud)) !(ft^3)          
            MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%St_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal

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

                enddo
            
            endif   
        
    enddo
!========================STRING END================= 
    
!========================== tripping in for OP remove ===============================   
                
    !if (DeltaVolumeOp>0. .and. DeltaVolumeOp< Op_MudDischarged_Volume%Last()) then
    !    Op_MudDischarged_Volume%Array(Op_MudDischarged_Volume%Length())= Op_MudDischarged_Volume%Array(Op_MudDischarged_Volume%Length()) - DeltaVolumeOp
    !else
    !    Op_MudDischarged_Volume%Array(Op_MudDischarged_Volume%Length()-1)=  Op_MudDischarged_Volume%Array(Op_MudDischarged_Volume%Length()-1) - (DeltaVolumeOp-Op_MudDischarged_Volume%Last())
    !                
    !    call Op_MudDischarged_Volume%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_Mud_Backhead_X%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_Mud_Backhead_section%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_Mud_Forehead_X%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_Mud_Forehead_section%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_Density%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_RemainedVolume_in_LastSection%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_EmptyVolume_inBackheadLocation%Remove (Op_MudDischarged_Volume%Length())
    !    call Op_MudOrKick%Remove (Op_MudDischarged_Volume%Length())
    !endif
    !     

!============================= Bottom Hole ============================== 
        
                !Op_MudDischarged_Volume%Array(1)= Op_MudDischarged_Volume%Array(1)+ ((GasKickPumpFlowRate/60.)*DeltaT_Mudline)    !(gal)    due to KickFlux    
imud=0     
    do while (imud < MudSystem%Op_Mud_Forehead_X%Length())
        imud = imud + 1
        
            if (imud> 1) then
                MudSystem%Op_Mud_Backhead_X%Array(imud)= MudSystem%Op_Mud_Forehead_X%Array(imud-1)
                MudSystem%Op_Mud_Backhead_section%Array(imud)= MudSystem%Op_Mud_Forehead_section%Array(imud-1)
            endif
            
                
            MudSystem%DirectionCoef= (MudSystem%Xend_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))) &
                / ABS(MudSystem%Xend_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))-MudSystem%Xstart_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud)))
            ! +1 for string  ,   -1 for annulus
                
                           
                                                                                                                    
            MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%DirectionCoef* (MudSystem%Xend_OpSection(MudSystem%Op_Mud_Backhead_section%Array(imud))- MudSystem%Op_Mud_Backhead_X%Array(imud))* &
                MudSystem%Area_OpSectionFt(MudSystem%Op_Mud_Backhead_section%Array(imud)) !(ft^3)          
            MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)= MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)* 7.48051948d0        ! ft^3  to gal
            
         
            if ( MudSystem%Op_MudDischarged_Volume%Array(imud) <= MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)) then
                MudSystem%Op_Mud_Forehead_section%Array(imud)= MudSystem%Op_Mud_Backhead_section%Array(imud)
                MudSystem%Op_Mud_Forehead_X%Array(imud)= MudSystem%Op_Mud_Backhead_X%Array(imud)+ MudSystem%DirectionCoef*(MudSystem%Op_MudDischarged_Volume%Array(imud)/7.48051948d0)/MudSystem%Area_OpSectionFt(MudSystem%Op_Mud_Backhead_section%Array(imud))
                                                                            !   7.48 is for gal to ft^3
                
            else
                    
                MudSystem%isection= MudSystem%Op_Mud_Backhead_section%Array(imud)+1
                MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Op_MudDischarged_Volume%Array(imud)- MudSystem%Op_EmptyVolume_inBackheadLocation%Array(imud)
                    
                do 
                        if (MudSystem%isection > F_Counts%BottomHoleIntervalCounts) then        ! last pipe section(well exit)
                            if( imud==1) MudSystem%KickDeltaVinAnnulus= MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)      ! Kick enters Annulus space
                            MudSystem%Op_MudDischarged_Volume%Array(imud)= MudSystem%Op_MudDischarged_Volume%Array(imud)- MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)
                            MudSystem%Op_Mud_Forehead_X%Array(imud)= MudSystem%Xend_OpSection(F_Counts%BottomHoleIntervalCounts)
                            MudSystem%Op_Mud_Forehead_section%Array(imud)= F_Counts%BottomHoleIntervalCounts
                                
                            if (MudSystem%Op_MudDischarged_Volume%Array(imud)<= 0.0d0)  then     ! imud is completely exited form the well
                                call RemoveOpMudArrays(imud)
                            endif
                            
                            exit
                        endif
                                 
                    MudSystem%xx= MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)/ MudSystem%OpSection_VolumeCapacity(MudSystem%isection)   !(gal)
                        
                    if (MudSystem%xx<= 1.0) then
                        MudSystem%Op_Mud_Forehead_section%Array(imud)= MudSystem%isection
                        MudSystem%Op_Mud_Forehead_X%Array(imud)= (MudSystem%xx * (MudSystem%Xend_OpSection(MudSystem%isection)- MudSystem%Xstart_OpSection(MudSystem%isection)))+ MudSystem%Xstart_OpSection(MudSystem%isection)
                        exit
                    else
                        MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)= MudSystem%Op_RemainedVolume_in_LastSection%Array(imud)- MudSystem%OpSection_VolumeCapacity(MudSystem%isection)
                        MudSystem%isection= MudSystem%isection+ 1
                        
                    endif

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

                
            enddo
            
            exit ! 
            
        endif            

       !WRITE(*,*) imud,'Op_MudDischarged_Volume%Array(imud)' , Op_MudDischarged_Volume%Array(imud), Op_Density%Array(imud)            
            
            
            
    enddo


    !write(*,*) 'Op_Mud_Forehead_X%Length()' , Op_Mud_Forehead_X%Length()
    !
    !   WRITE(*,*) 'Xend_PipeSection(F_StringIntervalCounts)' , Xend_PipeSection(F_StringIntervalCounts)
    !   WRITE(*,*) 'Op_Mud_Backhead_X%Array(1)' , Op_Mud_Backhead_X%Array(1) 
    !   WRITE(*,*) 'Op_Mud_Forehead_X%Array(1)' , Op_Mud_Forehead_X%Array(1)
    !   WRITE(*,*) 'Op_Mud_Backhead_X%Array(2)' , Op_Mud_Backhead_X%Array(2) 
    !   WRITE(*,*) 'Op_Mud_Forehead_X%Array(2)' , Op_Mud_Forehead_X%Array(2) 
!========================Bottom Hole END=================                 
 
    if (MudSystem%iLoc == 1) then
        MudSystem%MudSection= F_Counts%StringIntervalCounts+1
        MudSystem%BackheadX= MudSystem%Xstart_PipeSection(F_Counts%StringIntervalCounts+1)
    elseif (MudSystem%iLoc == 2) then
        MudSystem%MudSection= MudSystem%Kick_Forehead_section
        MudSystem%BackheadX= MudSystem%Kick_Forehead_X
    endif    
    
!========================ANNULUS ENTRANCE==================== 
        
                !write(*,*) 'iloc=====' , iLoc
        if ((ABS(MudSystem%AnnulusSuctionDensity_Old - MudSystem%St_Density%Last()) >= MudSystem%DensityMixTol) .OR. (MudSystem%DeltaVolumeOp == 0.0 .and. ABS(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%St_Density%Last())>=MudSystem%DensityMixTol .and. MudSystem%AnnulusFlowRate/=0.0d0) ) then ! new mud is pumped
        call MudSystem%Ann_Density%AddTo (MudSystem%iLoc,MudSystem%St_Density%Last())
        call MudSystem%Ann_MudDischarged_Volume%AddTo (MudSystem%iLoc,0.0d0)
        call MudSystem%Ann_Mud_Forehead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
        call MudSystem%Ann_Mud_Forehead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
        call MudSystem%Ann_Mud_Backhead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
        call MudSystem%Ann_Mud_Backhead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
        call MudSystem%Ann_RemainedVolume_in_LastSection%AddTo (MudSystem%iLoc,0.0d0)
        call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystem%iLoc,0.0d0)
        call MudSystem%Ann_MudOrKick%AddTo (MudSystem%iLoc,0)
        call MudSystem%Ann_CuttingMud%AddTo (MudSystem%iLoc,0)
             
        MudSystem%AnnulusSuctionDensity_Old= MudSystem%St_Density%Last()
            
        MudSystem%MudIsChanged= .true.
        endif  

                MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+ ((MudSystem%AnnulusFlowRate/60.0d0)*MudSystem%DeltaT_Mudline)    !(gal)  
         
!========================Tripping In==================== 
         
!write(*,*) 'DeltaVolumeOp=' , DeltaVolumeOp
            if (MudSystem%DeltaVolumeOp > 0.0 .and. MudSystem%MudIsChanged== .false.) then !.and. DrillingMode== .false.) then      ! trip in mode(loole paeen) 
                
            !write(*,*) 'Tripping In'
                
                MudSystem%NewDensity= (MudSystem%St_Density%Last()*((MudSystem%AnnulusFlowRate/60.)*MudSystem%DeltaT_Mudline)+MudSystem%Op_Density%Last()*MudSystem%DeltaVolumeOp)/(((MudSystem%AnnulusFlowRate/60.0d0)*MudSystem%DeltaT_Mudline)+MudSystem%DeltaVolumeOp)
                MudSystem%NewVolume= ((MudSystem%AnnulusFlowRate/60.)*MudSystem%DeltaT_Mudline)+MudSystem%DeltaVolumeOp
                
        !write(*,*) 'Ann_MudDischarged_Volume%Array(1)=', Ann_MudDischarged_Volume%Array(1), 'NewVolume=', NewVolume
        
            if (abs(MudSystem%Ann_Density%Array(MudSystem%iLoc)-MudSystem%NewDensity)< MudSystem%DensityMixTol) then ! 1-Pockets are Merged  - (ROP is 0)               
                MudSystem%Ann_Density%Array(MudSystem%iLoc)= (MudSystem%Ann_Density%Array(MudSystem%iLoc)*MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewDensity*MudSystem%NewVolume)/(MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%NewVolume)
                 MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)+MudSystem%DeltaVolumeOp
                 MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                 MudSystem%Ann_Mud_Forehead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                 MudSystem%Ann_Mud_Backhead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                 MudSystem%Ann_Mud_Backhead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                 MudSystem%Ann_RemainedVolume_in_LastSection%Array(MudSystem%iLoc)= (0.0d0)
                 MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(MudSystem%iLoc)= (0.0d0)                    
            else        ! 2-Merging conditions are not meeted, so new pocket
                call MudSystem%Ann_Density%AddTo (MudSystem%iLoc,MudSystem%NewDensity)
                call MudSystem%Ann_MudDischarged_Volume%AddTo (MudSystem%iLoc,MudSystem%NewVolume)
                call MudSystem%Ann_Mud_Forehead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                call MudSystem%Ann_Mud_Forehead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                call MudSystem%Ann_Mud_Backhead_X%AddTo (MudSystem%iLoc,MudSystem%BackheadX)
                call MudSystem%Ann_Mud_Backhead_section%AddTo (MudSystem%iLoc,MudSystem%MudSection)
                call MudSystem%Ann_RemainedVolume_in_LastSection%AddTo (MudSystem%iLoc,0.0d0)
                call MudSystem%Ann_EmptyVolume_inBackheadLocation%AddTo (MudSystem%iLoc,0.0d0)
                call MudSystem%Ann_MudOrKick%AddTo (MudSystem%iLoc,0)
                call MudSystem%Ann_CuttingMud%AddTo (MudSystem%iLoc,0)
                
            endif
            
                
            elseif (MudSystem%DeltaVolumeOp > 0.0 .and. MudSystem%MudIsChanged== .true. .and.  ROP_Bit%RateOfPenetration==0.) then
                 MudSystem%Ann_Density%Array(MudSystem%iLoc)= MudSystem%NewDensity
                 MudSystem%Ann_MudDischarged_Volume%Array(MudSystem%iLoc)= MudSystem%NewVolume
                 MudSystem%Ann_Mud_Forehead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                 MudSystem%Ann_Mud_Forehead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                 MudSystem%Ann_Mud_Backhead_X%Array(MudSystem%iLoc)= MudSystem%BackheadX
                 MudSystem%Ann_Mud_Backhead_section%Array(MudSystem%iLoc)= MudSystem%MudSection
                 MudSystem%Ann_RemainedVolume_in_LastSection%Array(MudSystem%iLoc)= (0.0d0)
                 MudSystem%Ann_EmptyVolume_inBackheadLocation%Array(MudSystem%iLoc)= (0.0d0)
            endif   
    

!========================Tripping In - End====================
  
            
!======================== ANNULUS ==================== 
             
                   MudSystem%MudIsChanged= .false.          
             
imud= 0

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

                enddo
            
            endif         
     
    enddo
!========================ANNULUS END================= 
    
    !if ( WellisNOTFull == .false. ) then
    !    write(*,*) 'MudSystem%AnnulusFlowRate==' , MudSystem%AnnulusFlowRate
    !    call Set_FlowRate(real(100.*min(MudSystem%AnnulusFlowRate,PedalMeter)/(PedalMeter/10.), 8))
    !
    !    
    !endif
    

        
end subroutine Utube1_and_TripIn