Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAbout1999 Tabasco Oil PoolARCO Alaska, Inf
Post Office _ix 100360
Anchorage Alaska 99510-0360
Telephone 907 276 1215
Stephen V. Bross
Supervisor
Greater Kuparuk Area Satellite Development
ATO - 1126
Phone 265-6083 Fax 265-6133
March 27, 2000
Mr. Robert Christenson, Chairman of the Commission
Alaska Oil and Gas Conservation Commission
3001 Porcupine Drive
Anchorage, Alaska 99501-3120
Re: 1999 Tabasco Oil Pool Annual Reservoir Surveillance Report
Dear Mr. Christenson:
In compliance with Rule 11, Conservation Order No. 435, ARCO Alaska,
operator of the Kuparuk River Field, is hereby submitting the annual report on
the Tabasco Oil Pool. This report documents the required information pertinent
to the field development and enhanced recovery operations from January
through December 1999. The following is an outline of the information
provided:
a. A summary of the enhanced recovery project (Attachment 1).
b. Voidage balance, by month, for produced and injected fluids
(Attachment 2, Attachment 3).
c. Analysis of reservoir pressure surveys taken in 1999 (Attachment 4).
d. Results of production surveys, and any special surveys, taken on the
Tabasco Oil Pool in 1999 (Attachment 5).
e. Results of well allocation and test evaluation for Rule 7, and any other
special monitoring (Attachment 6).
f. Future development plans (Attachment 7).
If you have any questions concerning this data, please contact Judith
Abrahams at (907) 659-7061 or Jack Walker at (907) 265-6268.
Sincerely,
-'� 14
Steve Bross
GKA Satellite Development Supervisor
RECEIVED
MAR 2 9 2000
Alaska Oil & Gas Cons. Commission
Anchorage
ARCO Alaska, Inc. is a Subsidiary of Atlantic Richfield Company AR313-6003-C
Attachment 1
Tabasco Oil Pool
1999 Annual Reservoir Surveillance Report
Summary of the Enhanced Recovery Project
Tabasco produced 1920 MSTB of crude, 305 MMSCF of formation gas, and
1344 MB of water during 1999. Water injection was 2223 MB over the same
period. Cumulative oil, gas, and water production and water injection through
year end 1999 were 2404 MSTBO, 417 MMSCF, 1395 MBW, and 2778 MBWI,
respectively. The cumulative injection/withdrawal ratio was 0.7 on a reservoir
barrel basis through year end 1999. Reservoir pressure declined from
approximately 1440 psi to 1220 psi during 1999.
One new injector was put on line in 1999, but injection was limited in the new
injector due to cement problems. Work is ongoing to repair that injector and
increase injection with the objective of reservoir pressure recovery. Four new
producers were completed with openhole gravel packs and electric submersible
pumps were installed for artificial lift. Year end 1999 Tabasco well count (all at
Kuparuk River Unit Drill Site 2T) was:
Producers: 5 completed 5 on line
Injectors: 2 completed 1 on line
Water production increased to a year end water:oil ratio of 0.93 bbl water per
STBO. Water breakthrough occurred at 3 of 5 producers. A water shutoff
treatment was unsuccessful in the highest watercut producer. Production and
injection logs, coupled with the structural positions and water breakthrough
histories of the producers, suggest that the water production mechanism is
dominated by gravity -induced slumping.
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Kuparuk River Unit
Tabasco Oil Pool
1999 Annual Reservoir Surveillance Report
Reservoir Pressure Surveys
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Attachment 5
Kuparuk River Unit
Tabasco Oil Pool
1999 Annual Reservoir Surveillance Report
Production Logs and Special Surveys
Well
Date
Type
Comments
2T-202
July 6, 1999
CT -conveyed
Water entry located near base of interval. Test rates during logging:
FSPL, DEFT
1614 BOPD, 337 BWPD, 17.3% WC, 147 MSCFD and 2326 BOPD,
for water
472 BWPD, 16.9% WC, 260 MSCFD
entry ID
2T-209
June 17, 1999
CT -conveyed
Water entry concentrated at base of interval. Test rates during
FSPL, DEFT
logging: 3641 BOPD, 3719 BWPD, 51% WC, 491
for water
entry ID
2T-201
May 14, 1999
Injection
>70% injection concentrated in top 20'tvd of interval.
profile
5000 BPD profile: 3358-3374'MD (2908-2925'ss) 73 %
3488-3502'MD (3035-3049'ss) 8
3515-3522'MD (3061-3068'ss) 9
3568-3599'MD (3113-3144'ss) 10
100 %
2500 BPD profile: 3358-3374'MD (2908-2925'ss) 72 %
3488-3502'MD (3055-3049'ss) 8
3515-3520'MD (3061-3066'ss) 7
3568-3599'MD (3113-3144'ss) 13
100 %
Attachment 6
Kuparuk River Unit
Tabasco Oil Pool
1999 Annual Reservoir Surveillance Report
Wells Allocation and Test Evaluation Summary
2T Tabasco production commenced 2/14/99 with 2T-202. Well tests were
completed exclusively through the 2T separator through April. The 2T Tabasco
Accuflow was commissioned 4/17/99, and accurate measurements of oil, total
fluid, and gas rates through the Accuflow were verified with comparison testing
in the 2T separator. The phase dynamics water cut measurements were
verified for each well with lab analysis of fluid samples from the Accuflow, and
phase dynamics calibrations were applied as necessary. Chemical injection
sensitivities completed in June for the 2T Accuflow verified the requirement for
-10 gpd anti -foam injection for effective separation of wells producing greater
than 3,000 bfpd. Sensitivity testing for well 2T-209, which produced greater
than 6,000 bfpd and exceeded 50% water cut at the time of the testing,
indicated that - 10 gpd of emulsion breaker is necessary to maintain stable
density for 2T-209 well tests.
A minimum of two well tests per month were taken on production wells. Fluid
samples were obtained on a regular basis, and water cut corrections were
applied to well tests as required based on the subsequent lab analysis.
Generally, very good agreement was observed between the phase dynamics
and the shakeout analysis. Production volumes were tracked through the
Setsim production monitoring system. Tabasco production was applied an
allocation factor of 1.0 for 1999.
Attachment 7
Kuparuk River Unit
Tabasco Oil Pool
1999 Annual Reservoir Surveillance Report
Future Development Plans
Tabasco Drill Site 2T development plans for 2000 and beyond were created to
take advantage of the gravity -induced water slumping. Three new producers
are planned for mid -year 2000 on the periphery of the reservoir where the base
of the reservoir is structurally high. Two of these planned 2000 wells will be
extended reach departure wells which will extend the 2T Tabasco accumulation
to the north if successful. In addition to the three new wells planned for mid-
2000, horizontal producers are also planned.
Horizontal producers are planned near the top of the interval to provide vertical
standoff from the water. The design phase for a horizontal producer was begun
in 1999. Studies of horizontal hole stability, drill -in and completion fluids, and
completion equipment are in progress. It is expected that the first horizontal
producer will be drilled in fourth quarter 2000, or early 2001. Current plans
include drilling a total of three horizontal producers.
Injection plans call for increasing injection to accomplish a cumulative net zero
voidage and restore original reservoir pressure. Work was initiated in early
2000 to repair mechanical problems with injector 2T-210. Two new injectors
are planned to support the additional offtake from planned future producers.
However, conversion(s) of an existing producer(s) to water injection is also
being considered as an alternative to new injectors. Feasibility studies for
water injection expansion were conducted in 1999 with two options carried
forward for further study: adding injection pipeline capacity, or adding a local
booster pump at Drill Site 2T.
Screening evaluations indicate that Tabasco development beyond Drill Site 2T
is most prospective at Kuparuk River Unit Drill Sites 3H and 3G. Tabasco
geologic and engineering studies in 1999 identified Drill Site 3H appraisal well
locations which may be drilled as early as fourth quarter 2000.
