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BP – Smart Wells / Smart Fields Skip DESAULNIERS.

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Presentation on theme: "BP – Smart Wells / Smart Fields Skip DESAULNIERS."— Presentation transcript:

1 BP – Smart Wells / Smart Fields Skip DESAULNIERS

2 BP – Smart Wells / Smart Fields Operational flare reduction versus typical associated gas flaring BPs efforts has mostly been focused on operational reductions The most recent major associated gas reduction was the Chirag, Azerbaijan platform tie-in to a new injection platform, 25 MMscfd flare reduction

3 BP – Smart Wells / Smart Fields Two examples of flare reduction success using process control optimization 1.Trinidad platform – slugging 2.USA gas field – well deliquification venting Both examples were flaring or venting on a regular or routine basis but not considered continuous

4 BP – Smart Wells / Smart Fields Trinidad – Samaan Platform – National Gas Company connected. – Lots of compression capacity but lots of flaring. – Major work effort to investigate gathering system slugging – A project was developed to install inlet control valves to stabilize the inlet slugging. but …


6 BP – Smart Wells / Smart Fields An intervention was organized with a process control expert It was quickly established that the compression surge protection system was responsible for the slugging – The control system was causing the pressure increase in the inlet separator but also extending the upset by not closing the surge valve quickly



9 BP – Smart Wells / Smart Fields The keys to success were to engage management first The team interviewed the project staff, the local facility engineering staff, and the operating staff on the platform – Testing with a high speed process analyzer proved what the interview process was suggesting


11 BP – Smart Wells / Smart Fields Additional project requirements – added boosters to make surge and recycle valves respond faster – activated available programming by burning a new eprom chip

12 BP – Smart Wells / Smart Fields Flare reduction was immediate and sustainable Inlet slugging stabilized immediately The new compression control allowed for both compressors to run simultaneously 7.5 MMscfd flare reduction (145k tonne CO 2 e) The project and therefore a platform outage was avoided


14 BP – Smart Wells / Smart Fields Farmington, New Mexico, USA Dispersed tight gas field, 2300 wells (1000 plunger lift wells) Liquid loading occurs when well flow rate declines to below the critical velocity to lift liquids Plunger lift systems are a very inexpensive way to deal with liquid loading

15 Distance Pressure

16 BP – Smart Wells / Smart Fields Plunger lift control can be as simple as a clock control for "On" and "Off" cycles or sophisticated programming

17 Clock NSTAL/OFFXMITTER1.BBTI.NSTL3508 Transmitter Installed 18 %METER1.ALMHI.PCNT% of Range for High Alarm 17 %METER1.ALMLO.PCNT% of Range for Low Alarm 16 %METER1.DPOFF.PCNT% of Range for Cutoff15 Degrees FMETER1.TEMP.SPANTemperature Span14 Degrees FMETER1.TEMP.ZEROTemperature Zero13 PSIGMETER1.PRESS.SPANPressure Span12 PSIGMETER1.PRESS.ZEROPressure Zero11 H20METER1.DP.SPANDP Span10 H2OMETER1.DP.ZERODP Zero9 Up/Down StreamMETER1.TAP.LOCTap Location8 Degrees FMETER1.TEMP.BASETemperature Base7 PSIAMETER1.PRESS.ATMAtmospheric Pressure6 PSIAMETER1PRESS.BASEPressure Base5 Carbon/StainlessMETER1.ORIF.MATOrifice Material4 InchesMETER1.ORIF.SIZEOrifice Size3 Carbon/StainlessMETER1.PIPE.MATPipe Material2 InchesMETER1.PIPE.SIZEPipe Size1 Engineering UnitsSignal NameParameterIndex LIST #2 BTUMETER1.GAS.BTUEnergy23 METER1.GAS.SGSpecific Gravity22 Mole %METER1.GAS.ARArgon21 Mole %METER1.GAS.HEHelium20 Mole %METER1.GAS.NC10n-Decane19 Mole %METER1.GAS.NC9n-Nonane18 Mole %METER1.GAS.NC8n-Octane17 Mole %METER1.GAS.NC7n-Heptane16 Mole %METER1.GAS.NC6n-Hexane15 Mole %METER1.GAS.NC5n-Pentane14 Mole %METER1.GAS.IC5i-Pentane13 Mole %METER1.GAS.NC4n-Butane12 Mole %METER1.GAS.IC4i-Butane11 Mole %METER1.GAS.O2Oxygen10 Mole %METER1.GAS.COCarbon Monoxide9 Mole %METER1.GAS.H2Hydrogen8 Mole %METER1.GAS.H2SHydrogen Sulfide7 Mole %METER1.GAS.H20Water6 Mole %METER1.GAS.C3Propane5 Mole %METER1.GAS.C2Ethane4 Mole %METER1.GAS.CO2Carbon Dioxide3 Mole %METER1.GAS.N2Nitrogen2 Mole %METER1.GAS.C1Methane1 Engineering UnitsSignal NameParameterInde x LIST #3 0 MinsVENT1.MANUAL.STPTThe well will vent for time set. AUTOWELL1.CRATIO.AUTOAutomatically set Tubing/Casing Set Point.5WELL1.CRATIO.STPTTubing/Casing Ratio Set Point 90 psigWELL1.TPRES.STPTMinimum Tubing Pressure Setpoint to close Vent 0VENT1.TIME.SPMNMaximum Time to Vent in a Month Setpoint 120 MinutesVENT1.TIME.SPDYMaximum Time to Vent in a Day Setpoint 0WELL1.CYCLE.STPTNumber of Well Open/Close Cycles to Vent Setpoint DisableWELL1.CYCLE.NBLEEnable Well Open/Close Cycle to Vent 3WELL1.PLNGRF.SPCNPlunger Consecutive No Arrival Setpoint AUTOVENT1.MANUAL.AUTOVent is Manual / Automatic 0VENT1.NOVENT.SPMNMinute where well can vent 0VENT1.NOVENT.SPHNHour where well can vent 0VENT1.NOVENT.SPMFMinute where well cannot vent 0VENT1.NOVENT.SPHFHour where well cannot vent Default ValueSignal NameParameter Vent Control Enable/DsableMETER1.RANGE.CNTLAllows the valve to control if the flow rate causes the meter to be out of range. Cyclic/RemainVALVE1.CYCLIC.Do Not Shut Valve when well Closes 0 MCF/DVALVE1.FLOW.STPTFlow Rate Set point 3VALVE1.LOCKED.STPTSetpoint to set Valve Locked Alarm.1 secsVALVE1.OUTPUT.MINMinimum Bump Size for the Valve movement 2%VALVE1.FLOW.GAINGain 15 secsVALVE1.TRAVEL.TIMEChoke Close to Open Travel Time OPENVALVE1.OPEN.Open or Close Choke when in Manual AUTOVALVE1.MANUAL.AUTOChoke in Automatic or Manual OFFVALVE1.SUSPND.CNTLSuspend Valve Control Default ValueSignal NameParameter VALVE CONTROL 0.0RECYCLE1.LRATIO.STPTLow Set Point to Open Valve 5.0RECYCLE1.HRATIO.STPTHigh Set Point to Open Valve RECYCLE1.PRATIO.CURRatio Suction / Discharge Pressure Casing/TubingRECYCLE1.PRESS.SRCESource for Ratio Calculation Manual/Auto RECYCLE1.MANUAL.AUT O Recycle Valves Mode MinutesWELL1.TIMEON.STPTAmount of Time Well Should Be On (Time Clock) MinutesWELL1.TIMEOF.STPTAmount of Time Well Should Be Off (Time Clock) MinutesWELL1.FLOWON.STPTMinimum Time Well is ON MinutesWELL1.TIMEOF.SPMNWell Shut-in Minimum Time 0 MCFDRECYCLE1.FLOPEN.STPTOpen Recycle Valve when Flow Rate < Set point 0 PSIGRECYCLE1.PROPEN.STPTOpen Recycle Valve when Line Pressure > Set point 0 PSIGRECYCLE1.PRCLOS.STPTClose Recycle Valve when Line Pressure < Set point OFFRECYCLE1.VALVE.NSTLRecycle Valve Installed Default ValueSignal NameParameter RECYCLE VALVE CONTROL 1 MinuteCATCHER1.DLAYOF.STPTDelay Set Point for flow rate below catcher flow rate 1 MinuteWELL1.PLNGR.SPDLSet Point Plunger Drop Delay 125 %CATCHER1.FLOWTN.PCN T % change of Turner Rate OFFWELL1.CATCH.NSTLPlunger Catcher Installed Default ValveSignal NameParameter Catcher Configuration Arrive / WaitinWELL1.PLNGR.ARR2Plunger Arrive Flag 0 MinutesWELL1.PLNGR.T005Previous Time in plunger cycle 0 MinutesWELL1.PLNGR.T004Previous Time in plunger cycle 0 MinutesWELL1.PLNGR.T003Previous Time in plunger cycle 0 MinutesWELL1.PLNGR.T002Previous Time in plunger cycle 0 MinutesWELL1.PLNGR.T001Previous Time in plunger cycle 0 MinutesWELL1.PLNGR.T000Previous Time in plunger cycle 0 MinutesWELL1.PLNGR.TIMETime in current plunger cycle 0 MinutesWELL1.PLNGR.STRTTime in the on cycle when plunger was released. 0 MinutesCATCHER1.DLAYOF.TIMETime flow rate has been below catcher flow rate Default ValveSignal NameParameter Catcher Results OUTPUTs Daily MinutesRECYCLE1.TIME.D02Time Recycle Valve was Open 21 CountRECYCLE1.COUNT.D02Number of Time Recycle Valve went open 20 CountVENT1.COUNT.D02Number of Times Vent Valve went open 19 CountVALVE1.COUNT.D02Number of Times Choke went open 18 MinutesWELL1.DWNTIM.D02Time Condition Code is >9 17 MinutesWELL1.OPENTM.D02Time Valve is not Closed 16 METER1.EXT.D02Extension15 METER1.CPRIME.D02C Prime14 MinutesVENT1.TIME.D02Vent Time13 PSIGVENT1.LPRES.D02Vent Pressure12 PSIGWELL1.LPRES.D02Line Pressure11 PSIGWELL1.TPRES.D02Tubing Pressure10 PSIGWELL1.CPRES.D02Casing Pressure9 MinutesMETER1.TIME.D02Flow Time8 MMBTUMETER1.ENERGY.D02Energy7 Degrees FMETER1.TEMP.D02Temperature6 PSIAMETER1.PRESS.D02Pressure5 H20METER1.DP.D02Differential Pressure4 MCFDMETER1.FLOW.D02Flow Rate3 MCFMETER1.VOLUME.D02Volume2 Calendar Date and TimeMETER1.TIMEDate/Time Stamp1 Engineering UnitsSignal NameParameterFie ld ARRAY #41 MinutesWELL1.DWNTIM.H02Time the Condition Code is > 9 17 MinutesWELL1.OPENTM.H02Time the Choke is Open16 METER1.EXT.H02Extension15 METER1.CPRIME.H02C Prime14 MinutesVENT1.TIME.H02Vent Time13 PSIGVENT1.LPRES.H02Vent Pressure12 PSIGWELL1.LPRES.H02Line Pressure11 PSIGWELL1.TPRES.H02Tubing Pressure10 PSIGWELL1.CPRES.H02Casing Pressure9 SecondsMETER1.TIME.H02Flow Time8 MMBTUMETER1.ENERGY.H02Energy7 Degrees FMETER1.TEMP.H02Temperature6 PSIAMETER1.PRESS.H02Pressure5 H20METER1.DP.H02Differential Pressure4 MCFHMETER1.FLOW.H02Flow Rate3 MCFMETER1.VOLUME.H02Volume2 Calendar Date and TimeMETER1.TIMEDate/Time Stamp1 Engineering UnitsSignal NameParameterFie ld ARRAY #46

18 BP – Smart Wells / Smart Fields With sophisticated programming for optimizing production, small mechanical details can interfere with the program sequencing Even the smallest flaw may result in the plunger not successfully arriving at the surface with the liquids. Consequently, any additional wellflow will simply add more liquids to the fluid column

19 BP – Smart Wells / Smart Fields Immediate solutions to deliquify liquids from a loaded well include swabbing and venting Venting is easy Swabbing requires effort, equipment and resources


21 BP – Smart Wells / Smart Fields Venting to deliquify has been a solution in this basin for a very long time Once the venting solution is used, it is very difficult to analyze well control problems because at any hint of trouble, the well vents and the liquid loading is eliminated

22 BP – Smart Wells / Smart Fields The project had to get back to basics on how plunger systems function A pilot project was organized with two sets of 20 wells The complex control system was adjusted to ensure the fundamentals were being followed

23 BP – Smart Wells / Smart Fields Findings 1.Venting hid the well problems 2.Minor leaks stole pressure energy from the well – even leaks through the choke to sales 3.Extended venting to flush the wellbore of liquids was ineffective if the plunger surfaced properly 4.The programming settings must follow the basics of plunger control



26 BP – Smart Wells / Smart Fields The result was a 4 MMscf/day vent reduction (675k tonne CO 2 e) Tools were developed to help the staff quickly identify wells that might be in trouble Morning reports were also created

27 BP – Smart Wells / Smart Fields The large success could only be accomplished on the most recent versions of the software Further reductions will occur when the well software is upgraded and loaded Considering, the software has to be loaded at each well one at a time, there is an opportunity to ensure the software is optimized prior to the upgrades

28 BP – Smart Wells / Smart Fields In Conclusion Operational flaring and venting is not difficult to recognize BP has found that process control tuning is an effective way to reduce routine or regular losses It may be easier to develop one or two large associated gas reduction projects but it is more realistic to reduce flaring and venting through small projects every day

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