presentation 10-22-2014.pptx

8/10/2019 Presentation 10-22-2014.pptx

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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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3


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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.

presentation 10-22-2014.pptx

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