Weatherford 2011 sucker rod pump catalog
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ARTIFICIAL LIFT SYSTEMS
®
Required Compression Ratios
as Reservoir Pressure Depletes
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ARTIFICIAL LIFT SYSTEMS
®
Gas Locking vs Gas Interference
vs a Pumped Off Condition
z Gas Locking
No valves open during pumping cycle.
No fluid lifted to surface.
z Gas Interference
Valves function properly, but reduced efficiency
as gas takes place of some fluid.
z Pumped Off Condition
Pumping rate exceeds ability of fluid to flow
into pump. Well does produce some fluid.
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ARTIFICIAL LIFT SYSTEMS
®
Gas Locking, Gas Interference
& a Pumped Off Condition
© Weatherford. All rights reserved.
ARTIFICIAL LIFT SYSTEMS
®
Rod Pump
Gas Locking
Not enough pressure generated in
compression chamber on down stroke
to open traveling valve.
Produced fluid in tubing rides up and
down with traveling valve, which is not
opening.
Causes
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ARTIFICIAL LIFT SYSTEMS
®
Rod Pump
Gas Lock
Effects
No fluid produced to the surface.
Fluid level on backside continues
to rise as no fluids are removed
from well.
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ARTIFICIAL LIFT SYSTEMS
®
Rod Pump -
Gas Locking
z Increase compression ratio in pump
through better design/assembly.
z Increase compression ratio in pump
through longer stroke or smaller plunger.
z Install II stager valve to remove
hydrostatic pressure from traveling valve.
z Reduce gas intake into pump through
better downhole separation.
z Increase pump intake pressure by
allowing higher fluid level on backside.
Solutions
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ARTIFICIAL LIFT SYSTEMS
®
Rod Pump
Gas Interference
Poor gas separation, prior to fluid
entering the pump, allows gas to
take the place of fluid in the
compression chamber.
Causes
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ARTIFICIAL LIFT SYSTEMS
®
Effects
Pump shows poor efficiency because
only fluid is being measured.
Pump is actually operating properly,
but fluid production is limited by
gas in pump.
Rod Pump
Gas Interference
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ARTIFICIAL LIFT SYSTEMS
®
Solutions
z Separate gas from fluid before it gets
to pump intake through better
downhole separation.
z Increase rate of well by lengthening
stroke, changing strokes per minute
or changing bore size.
This increases both gas and fluid
which are produced through
the pump.
Rod Pump
Gas Interference
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ARTIFICIAL LIFT SYSTEMS
®
API RWB Pump
API RHB Pump