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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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JET PUMP WITH REPLACABLE INTERNALS

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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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GUIDE TO JET PUMP PERFORMANCE

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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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EFFECT OF LIQUID IN LP GAS

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Spilamberto Field, AGIP, Italy

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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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HEWITT FIELD JET PUMPHP wells increased production by 25% & 41%

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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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JET PUMP SOLUTION USING NEW HP WELL

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INDE PLATFORM JET PUMP

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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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A (PD) TWIN SCREW PUMP

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I-SEP COMPACTSEPARATOR

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I-SEP IN DE-GASSING APPLICATION

I-SEP

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I-SEP WITH REPLACEABLE INTERNALS

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WELLCOM BOOST SYSTEM OFFSHORE MALAYSIA

Jet pump

I-SEP

HI-SEP

Booster pump

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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