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1© 2004 Weatherford. All rights reserved.
PACK OFF GAS LIFTENHANCES PRODUCTION IN OLDER FIELD
Presenter: Ken HilseAuthor: Abdul Thani Sulai
2© 2004 Weatherford. All rights reserved.
Insert String TechnologySarawak Fields Layout
3© 2004 Weatherford. All rights reserved.
Insert String TechnologyTemana Field
Temana West Temana Central
Temana East
1.7 MMstb8.2 MMstb9.9 MMstb
63.2 MMstb
=• Undev=• Dev=RUR=Np
TEMANA WEST
12.4 MMstb10.1 MMstb22.5 MMstb29.5 MMstb
=• Undev=• Dev=RUR=Np
TEMANA CENTRAL
3.4 MMstb0.2 MMstb3.6 MMstb6.3 MMstb
=• Undev=• Dev=RUR=Np
TEMANA EAST
8.001.4TEJT-T21.512.48.7TEJT-C/WNpUndevDev
Higher remaining oil potential in Temana Central area
4© 2004 Weatherford. All rights reserved.
Insert String TechnologyIdle Wells
• In flowing wells, water cut increases and reservoir pressure depletion causes some wells to cease to flow.
• Gas lift well not producing due to the liquid level having dropped below the last mandrel (SPM).
AFTER INSERTSTRING INSTALLEDBEFORE
5© 2004 Weatherford. All rights reserved.
Insert String TechnologyPressure Depth Analysis
6© 2004 Weatherford. All rights reserved.
Insert String TechnologyWhat is Insert String?
• The string tally consists of the following:– 2 3/8-in. O.D. tubing (spacer pipe) 15-ft, stinger and
receptacle– Upper and lower pack-off– Pack-off mandrel + GLV/orifice valve with check valve– 5- or 10-ft spacer pipe– Upper and lower tubing stop
• Install and retrieve using normal wireline operations• Installed in the existing 3 ½-in. O.D. tubing without
workover and no rig required
7© 2004 Weatherford. All rights reserved.
PACK OFF
UPPER PACK OFF
LowerPack Off
8© 2004 Weatherford. All rights reserved.
PACK OFF GLV MANDREL
PACK OFF GAS LIFT MANDREL
CONVENTIONAL GLV 1” O.D.
9© 2004 Weatherford. All rights reserved.
Insert String Technology
• 2-3/8-in. O.D. tubing or spacer pipe
10© 2004 Weatherford. All rights reserved.
GS Running /Pulling Tool
11© 2004 Weatherford. All rights reserved.
Insert String Technology
12© 2004 Weatherford. All rights reserved.
Insert String Technology
13© 2004 Weatherford. All rights reserved.
Insert String Technology
• Total length of one insert assembly per run is maximum 15.6-ft
• Total wireline lubricator is about 30-ft
14© 2004 Weatherford. All rights reserved.
Insert String TechnologyCase Study No. 1• TE-15L closed-in since 1988• Low THP due to water cut increase• Installed in Dec. 2002 with a total
length of 624-ft, cost: USD $74,000• Produced about 1,500 BPD gross with
60% water cut – net 600 BPD• To date still producing, FTHP 150 psig
15© 2004 Weatherford. All rights reserved.
Insert String Technology
16© 2004 Weatherford. All rights reserved.
Insert String TechnologyCase Study No. 2• TE-28 closed-in since 1987 due to
depleted reservoir pressure (from 682-to 415-psig), FTHP 20 psig
• Insert string installed in May 2003 with total length about 400-ft, cost: USD $57,000
• Produced net oil about 100 BPD and to date still producing FTHP 100 psig
17© 2004 Weatherford. All rights reserved.
Insert String TechnologyCase Study No. 3• TE-67S closed-in since 1991 due to
low THP and back pressure (flow 280 psig)
• Insert string installed in June 2003 with total length 557-ft, cost: USD $68,000
• Produced net oil about 370 BPD and to date still producing FTHP 550 psig
18© 2004 Weatherford. All rights reserved.
Insert String TechnologyCase Study No. 4• TE-67L closed-in since Dec. 2000 due
to low THP and back pressure (flow line: 280 psig)
• Insert string installed in Sept. 2003 with total length 966-ft, cost: USD $107,000
• The well was reactivated and currently flowing
19© 2004 Weatherford. All rights reserved.
Insert String TechnologyConclusion
• Pack Off Insert string is a proven technology and successfully reactivated idle wells
• Can deepen gas lift injection point below production packer
• Increase FTHP and raise up liquid level in the tubing
• Less expensive than workover and very low risk
20© 2004 Weatherford. All rights reserved.
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