GAS WELL DELIQUIFICATION - Artificial lift · GAS WELL DELIQUIFICATION ... Ejector CHEVRON, USA :...
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Transcript of GAS WELL DELIQUIFICATION - Artificial lift · GAS WELL DELIQUIFICATION ... Ejector CHEVRON, USA :...
1 File Name
GAS WELL DELIQUIFICATIONUSING
JET PUMP TECHNOLOGYBy; Sacha Sarshar, Caltec
• BACK GROUND• PRINCIPLE OF JET PUMP OPERATION• SOME SOLUTIONS• FIELD EXPERIENC SO FAR• CONCLUDING REMARKS
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CAUSES OF LIQUID LOADING
• WELL FLOWING BELOW ANNULAR MIST REGIME• GAS VELOCITY BELOW A MINIMUM
(5m/s at wellhead)• POOR WELL DRAW DOWN
SIGNS OF LIQUID LOADING• FLUCTUATING THP• WELLHEAD FLOW VELOCITY BELOW MINIMUM• DECREASING LIQUID/GAS RATIO
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REMEDIAL ACTIONS
• MAINTAIN RESERVOIR PRESSURE/FLOW• IMPROVE WELL FLOW AT PERFORATION
ZONE• CHANGE TUBING ( increase velocity)• ARTIFICIAL LIFT (VARIOUS METHODS)• WATER SHUT OFF• REDUCE THP, USING A PRESSURE
BOOSTING SYSTEM( jet pump application)
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IMPORTANT FACTORS TO CONSIDER
• THE SEVERITY OF THE PROBLEM CAUSED BY DELAYS IN TAKING REMEDIAL ACTION
• EARLY REMEDIAL ACTION AVOIDS OR DEFERS COSTLY SOLUTIONS
• NOT ALL CASES NEED GAS-LIQUID SEPARATION
• DEFERRING COSTLY SOLUTIONS IS STILL COST EFFECTIVE ,AS LOWER COST SOLUTIONS HAVE A SHORT PAY BACK PERIOD
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JET PUMP-PRINCIPLE OF OPERATION
NOZZLEMIXINGTUBE DIFFUSER
HP FLOW
LP FLOW
DISCHARGEFLOW
NOZZLEMIXINGTUBE DIFFUSER
HP FLOW
LP FLOW
DISCHARGEFLOW
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APPLICATIONS OF JET PUMPS IN OIL&GAS PRODUCTION
• WELL KICK-OFF/DELIQUIFICATION• BOOST PRODUCTION OF INDIVIDUAL WELLS
(oil or gas)• BOOST PRODUCTION OF MANIFOLDED
WELLS (oil or gas)• BOOST PRESSURE OF LP GAS• PREVENT FLARING LLP GAS • DE-BOTTLENECK COMPRESSORS• DOWN HOLE, GAS MOTIVE FLOW
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KEY FACTORS AFFECTING PERFORMANCE
• HP/LP PRESSURE RATIO• LP/HP FLOW RATIO• DISCHARGE/LP PRESSURE RATIO
OTHER FACTORS;
• TEMPERATURE,Z FACTOR, Cp/Cv ratio etc.
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SOURCES OF MOTIVE (HP) GAS
• HP WELLS/ HP GAS LINE• LIFT GAS• COMPRESSOR OUTLET GAS• HP LIQUID (LIMITED)
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BP AMETHYST, UKProblem
WEAK WELLS WERE LOADED AND HAD RESTRICTED PRODUCTION UNDER PREVAILING THP
To
Dow
nstr
eam
Proc
ess/
Pipe
lines
High Pressure Wells
Low Pressure Wells(initially backedout)
Gas Eductor on Platform
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G EM IN IS ub sea M anifo ld
ExportSales
40M M S C FDCom pressor
7.4 M M S CFD850 psig
R ecycle
400 ps ig
200 ps ig
1250 psigP rocess
E jector
G EM IN IS ub sea M anifo ld
ExportSales
40M M S C FDCom pressor
7.4 M M S CFD850 psig
R ecycle
400 ps ig
200 ps ig
1250 psigP rocess
E jector
CHEVRON, USA : GEMINI PROJECT (GOM
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USE OF TEST SEPARATOR IN WELL REVIVAL
Test Separator
Production Header
Test Header
Booster Pump
Jet Pum
p
HP gas
Well
Test Separator
Production Header
Test Header
Booster Pump
Jet Pum
p
HP gas
Well
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ANGSI FIELD WELL REVIVAL OPTION
HI-SEP
TEST HEADER MAIN PRODUCTION HEADER
TO METERING SYSTEM
HP HEADER
P
P
T P
P
JET PUMP
P
TO EXPORT LINE
COMMINGLER
ALTERNATIVE PATH FOR LIQUIDS
BOOSTER PUMP
P
WELLCOM BOOST
SDV
M
EXISTING WELL TESTING METERS
A-1030
MA-1031 HI-SEP
LIFT GAS LINE
P P
WELL REVIVAL WELLCOM BOOST
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Table X3: MALAYSIA: Platform C: Gas Jet Pump Application for Well- Kickoff with Backpressure Reduction
4654.4 MMscfd & 100 bbl/d
240(initial 465)
One or two LP wells
8.3 MMscfd and 230 bbl/d
(1/3rd flow)
3100C73.3
4652 MMscfd & 200 bbl/d
165(initial 465)
C38.3 MMscfd and 230 bbl/d
(1/3rd flow)
3100C73.2
4652 MMscfd & 200 bbl/d
Well kick off
100(initial 465)
C325 MMscfd and 688 bbl/d
3100C73.1
Predicted(psia)
Fluid FlowrateMMscfd & bbl/d
Pressure(psia)
Well Name
Fluid Flowrate
MMscfd & bbl/d
Pressure(psia )
WELL
Discharge Pressure
Estimated Low PressureHigh PressureCase
17/5/07
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INDE PLATFORM S.NORTH SEA, UK
Low Pressure Gas Wells
Jet PumpCompressor
Export
Kilo
Juliet
Subsea Line
Davy Line
Bessemer Line
Dp
Separator
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WELLCOM BOOST SYSTEM
COMMINGLER
LOW PRESSURE OIL WELLS
JET PUMP
TO PIPELINE
GAS
LIQUID
I-SEP
BOOSTER PUMPCOMMINGLER
LIQUID
HIGH PRESSURE GAS GAS
LIQUID
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CONCLUDING REMARKS
• THERE ARE NUMEROUS SOLUTIONS FOR DELIQUIFICATION OF GAS WELLS
• THE APPROPRIATE SOLUTION DEPENDS MAINLY ON WELL FEATURES,RESERVOIR CONDITIONS,AND THE EXTENT OF LOADING
• JET PUMPS ARE HIGHLY COST EFFECTIVE TO OFFLOAD WELLS PROVIDED A MOTIVE HP SOURCE IS AVAILABLE AND THE WELL STATUS IS NOT BEYOND THE ABILITY OF THIS SOLUTION
• JET PUMPS CAN BE USED AS ADDITIONAL HELP TO OTHER SOLUTIONS TO INCREASE PRODUCTION