PerfLift
Perforated-zone gas lift system
Applications
Gas-lifting wells along the entire perforated interval below a production packer
Liquid-loaded gas and coalbed
methane wells
Gas-lifted oil wells
Benefits
Improved system efficiency compared
with traditional lifting methods
Lower initial investment in new wells for
accelerated payout and improved net
present value
Reliable ported or dual-bore
production packer
Optimize operations with
a simple system
Increased production
Chemical and fluid treatments enabled
across the perforations
Features
Reduce the cost and complexity of
liquid removal
Innovative completion design
Reduced operating costs
The PerfLift* perforated-zone gas lift system
is a cost-effective artificial lift system for
low-rate gas-lifted oil and liquid-loaded gas
wells. The system incorporates field-proven
Camco gas lift products in an innovative
completion architecture that enables gas lift
across long completion intervals below
a production packer.
Most methods of liquid removal require costly
intervention using a traditional workover rig
or coiled tubing unit. The PerfLift system,
however, is permanently installed when the
completion is run, so there is no need for a
service rig to install a system after the well is
already producing. The PerfLift gas lift system
is ready for service whenever it is needed, or
in cases where liquid loading is an ongoing
problem, it can be used continuously to
maximize production.
Maximize production from brownfields
Field-proven Camco* gas
lift technology
Real-time downhole monitoring with the
Phoenix* Select* gauge
The PerfLift system employs a series of Camco
gas lift products in tubing strings above and
below a ported or dual-bore production
packer. Conventional or side-pocket gas lift
mandrels are installed in the upper tubing
string. Internal-mount gas lift mandrels and
valves are sized and installed on the lower
tubing string across the perforated zone.
During system operation, gas is injected down
the upper tubing-string annulus and into the
lower tubing string through the packer to lift
the fluid column across the perforated zone.
Liquids then travel to the surface through the
production string.
Monitor lift conditions in real time
The Phoenix Select artificial lift monitoring
system can be installed with the PerfLift
system to monitor liquid encroachment and
differential pressure in the wellbore at the
deepest point of gas injection. The gauge is
placed immediately above the lowermost gas
lift mandrel to provide real-time information
that can be used to optimize production.
The PerfLift system is the only gas lift system with
the proven capability to lift below the packer to the
perforated depth of the well.
PerfLift
In the adjacent table are some early examples Production Increases Using the PerfLift System
of cost-effective production increases
Well 1, Texas
Well 2, Texas
delivered by the PerfLift perforated-zone
Gas, Mcf/d
gas lift system.
Before
110
43
After
Oil, bbl/d
Before
After
Water, bbl/d
Before
After
Perforated interval,
ft [m]
Casing, in
Upper tubing, in
Lower tubing, in
Well 3, Oklahoma
Well 4, Wyoming
273
225
45
110
146
367
0
0
0
1.5
2
40
0
0
60
159
2,373 [723.3]
40
74
964 [293.8]
15
20
2,255 [687.3]
79
159
1,002 305.4]
512
238
238
412
238
114
412
238
114
7
278
238
www.slb.com/al
*Mark of Schlumberger
Other company, product, and service names
are the properties of their respective owners.
Copyright 2012 Schlumberger. All rights reserved. 12-AL-0014
