The use of jet pumps/eductors for deliquifing - ALRDC

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GAS WELL DELIQUIFICATION
USING
• BACK GROUND
JET PUMP TECHNOLOGY
By; Sacha Sarshar, Caltec
• 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
• FLUCTUATING THP
SIGNS OF LIQUID LOADING
• 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)

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
HP FLOW
NOZZLE
MIXING
TUBE DIFFUSER
LP FLOW
DISCHARGE
FLOW

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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

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

Spilamberto Field, AGIP, Italy
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BP AMETHYST, UK
Problem
WEAK WELLS WERE LOADED
AND HAD RESTRICTED
PRODUCTION UNDER
PREVAILING THP
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High Pressure Wells
Gas Eductor
on Platform
Low Pressure Wells
(initially backedout)
To Downstream
Process/Pipelines

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CHEVRON, USA : GEMINI PROJECT (GOM
Process
200 psig
7.4 MMSCFD
850 psig
Ejector
400 psig
GEMINI
Sub sea
Manifold
40MMSCFD
Compressor
Recycle
Export
Sales
1250 psig

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HEWITT FIELD JET PUMP
HP wells increased production by 25% & 41%

USE OF TEST SEPARATOR IN WELL REVIVAL
Well
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Test
Header
Production
Header
Test
Separator
Booster
Pump
HP gas
Jet Pump

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ANGSI FIELD WELL REVIVAL OPTION
HP HEADER
TEST HEADER MAIN
PRODUCTION
HEADER
TO
METERING
SYSTEM
WELLCOM
BOOST
SDV
P
T P
HI-SEP
LIFT GAS LINE
A-1031
M
A-1030
M
EXISTING WELL
TESTING METERS
P
JET PUMP
HI-SEP
P
ALTERNATIVE
PATH FOR
LIQUIDS
P
BOOSTER PUMP
P
P
P
COMMINGLER
WELL REVIVAL
WELLCOM
BOOST
TO EXPORT LINE

Case
3.1
3.2
3.3
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Table X3: MALAYSIA: Platform C: Gas Jet Pump Application
for Well- Kickoff with Backpressure Reduction
WELL
C7
C7
17/5/07
C7
High Pressure
Pressure
(psia )
3100
3100
3100
Fluid
Flowrate
MMscfd &
bbl/d
25 MMscfd
and 688 bbl/d
8.3 MMscfd
and 230 bbl/d
(1/3 rd flow)
8.3 MMscfd
and 230 bbl/d
(1/3 rd flow)
Well
Name
C3
C3
One or
two LP
wells
Estimated Low Pressure
Pressure
(psia)
100
(initial
465)
165
(initial
465)
240
(initial
465)
Fluid Flowrate
MMscfd & bbl/d
2 MMscfd & 200
bbl/d
Well kick off
2 MMscfd & 200
bbl/d
4.4 MMscfd & 100
bbl/d
Discharge
Pressure
Predicted
(psia)
465
465
465

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
Davy Line
Bessemer Line
Juliet
Kilo
Separator
Low Pressure
Gas Wells
Compressor
Subsea Line
Dp
Jet Pump
Export

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WELLCOM BOOST SYSTEM
HIGH PRESSURE GAS
JET PUMP
GAS
LOW PRESSURE
OIL WELLS
I-SEP
GAS
COMMINGLER
LIQUID
LIQUID
LIQUID
COMMINGLER
BOOSTER PUMP
TO PIPELINE

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A (PD) TWIN SCREW PUMP

I-SEP COMPACT
SEPARATOR
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I-SEP
I-SEP IN
DE-GASSING
APPLICATION

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I-SEP WITH
REPLACEABLE
INTERNALS

WELLCOM BOOST SYSTEM OFFSHORE MALAYSIA
HI-SEP
Booster
pump
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Jet pump
I-SEP

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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