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History
Prior to 1992, nodownhole processing wasperformed except thatrelated to conventional
artificial lift of wells.
By 2002, there wereapproximately 50downhole water
separation/injectioninstallations andapproximately 60downhole gas/liquid
separation installations.
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Methods Downhole Gas
Separator
The first attempt to correct inefficient downhole
gas separation should be to set the pump
below the fluid entry zone if feasible. This is
the most efficient method of downhole gasseparation.
However, if the pump is set above the fluid
entry zone, a gas separator should be used
that offers an efficient gas/liquid separation
chamber with low dip tube friction loss which
results in complete pump fillage if sufficient
liquid inflow into the wellbore is available.
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Methods Downhole Gas
Separator
A gas separator is still anintake with special featuresto keep free gas from
entering the pump. Static gas separators use
reverse direction of fluid tocause more gas to move upthe annulus allowing fluid to
pump. Dynamic gas separator can
distinguished into 3 internalsections: pressure increase
chamber, separationchamber, and by pass.
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Methods Gas Separator
(cont.)
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Variable Speed Drives (VSD) -
1
Used as surface control package in all wellswith high volumes of gas
Advantage
Have the ability to control and manage startupand operations in gassy environments
keep the well producing longer through gasslugging flows
Combining the downhole monitoring systemand the VSD is a highly effective method ofoperating ESP's in gassy environments
Allows for automatic control of production rate
and fluid level
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Variable Speed Drives (VSD) -
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Variable Speed Drives (VSD) -
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Design
Maximum gas/water ratio
(Rm) is a key parameter.
Rm depends on the typeand geometrical structure
of separator obtained by
lab experiments or CFD
study.
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Advantages
Benefits of using downhole gas separator: Extend run time
Increase mean time between failures
Low NPSH impeller and blender XGC reduce gas
interference High-volume XGVS separator
Minimize pump downtime and restarts
Provide optimization of production rates
VSD: Flexibility
Optimization well production
Starting characteristics
Energy saving
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Disadvantages
Gas separator:
Apa?
VSD:
Electrical disturbance
Power operating requirements
Personnel required for operationHigh initial cost
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Improvements
The first is metering of
the quality and volume of
the injectant stream.
These must be knownfor:
reservoir management
well surveillance
prevention of formation
damage.
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Improvements
Downhole separator for
gas reinjection or for
artificial lift are likely to be
proven feasible.
Extend the lives of
existing mature wells
Improve the economics ofnew wells in deep water
and in remote satellite
areas
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Thank you.