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HomeMy WebLinkAboutOil-Kuparuk-TabascoAlaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool
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AOGCC Pool Statistics Kuparuk River Unit, Tabasco Oil Pool
Alaska Oil and Gas Conservation Commission > Annual Reports > Pool Statistics - 2004: Updated 11 July 2005 Page: 1 > 2 > 3
Operator: ConocoPhillips Alaska, Inc.
Discovery Well: ARCO Alaska, Inc.
Kuparuk River Unit 2T-201
Permit #195-122
API No. 50-029-20230-00-00
Sec. 1, T11N, R08E, UM
Depth: 4,175’ MD / 3,832' TVD
September 28, 1995
Status: Producing
Location: Central Arctic Slope Area Location Map PA Location Map DNR Unit Map
Orders: Complete List
Summary: The Tabasco Oil Pool is one of the satellite pools that have been discovered and developed utilizing Kuparuk River
Unit (“KRU”) infrastructure. The pool was discovered in 1986 during development drilling of the underlying Kuparuk
River Oil Pool from the KRU 2T-Pad. The Tabasco Sandstone underlies a large portion of the southern and western
KRU. Producible hydrocarbons were encountered in the Tabasco Sandstone between 3,352’ to 3,599’ measured
depth (“MD”) in the KRU 2T-201 well. The Tabasco pool lies at approximately 3,000’ true vertical depth subsea
(“TVDSS”), about 300’ to 400’ below the West Sak sands. Tabasco oil has an API gravity of 16 degrees, and it is
highly viscous (253 centipoise). No definitive oil-water contacts have been delineated within pool. Original oil in
place (“OOIP”) for the 2T-Pad area is projected at 48 to 131 million barrels of oil (“MMSTB”). A small gas cap of
about 32 acres occurs in the 2T-201 area, with the gas-oil contact at 2,915’ TVDSS. The gas cap contains an
estimated 100 MMSCF of gas in place, but is not expected to have a major impact on reservoir performance.
Regular production began in April of 1998. Production peaked in May 1999 at an average of 7,913 barrels of oil per
day (“BOPD”), and declined to 5,227 BOPD in December 2004.
Geology: The Tabasco Sandstone is an informal member of the Late Cretaceous-aged (Campanian) Schrader Bluff Formation.
It was deposited near a shelf margin as a prograding sequence of deltaic to near shore marine sediments. The
sandstone is discontinuously distributed over a broad region, with sand thickness generally most significant along the
shelf margin. Large-scale slumping and erosion are common. Two lithologies are present: a discontinuous thin-
bedded sandstone facies with shale interbeds and an overlying amalgamated sandstone facies. The thin-bedded
sandstone facies is more widespread; its gross interval thickness is about 80’ to 400’. The amalgamated sandstone
facies ranges in thickness between 45’ to 350’ thick. The transition between the two facies is abrupt. Porosity ranges
from 17 to 22% and averages 20%. Log water saturation ranges from 17 to 60%, with 20 to 25% representative of
the 2T-Pad area. Pressure transient permeability ranges from 3 to 100 Darcies. The Tabasco structure is a
monocline, dipping east to northeast and striking north to northwest in the western portion of the KRU and east to
southeast in the southern portion. The hydrocarbon-trapping mechanism is a combination of stratigraphic and
structural elements. The Tabasco accumulation is cut by a series of north-south and east-west normal faults, with
throws typically ranging between 10’ to 50’ and maximum throws to 100’. Oil distribution appears controlled by the
stratigraphic distribution of reservoir sands.
Strat Column
Orig. Oil in Place: 48 to 131 MMSTB (CO 435)
Production: Prod Chart Prod Report Prod Data
Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 9,735,474 0 1,328,980 26,189,706
2001 Total 1,317,558 0 180,047 4,357,006
2002 Total 1,089,001 0 158,610 5,408,990
2003 Total 1,541,615 0 187,877 4,864,655
2004 Total 1,472,323 0 182,459 5,749,828
2003 Daily Rate 4,278 0 515 13,328
2004 Daily Rate 4,034 0 500 15,753
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Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool
Change (%)-6%0 -3%18%
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Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool
Home Orders Staff Calendar Contact Us
AOGCC Pool Statistics Kuparuk RiverUnit, Tabasco Oil Pool
Alaska Oil and Gas Conservation Commission > Annual Reports > Pool Statistics - 2004: Updated 11 July 2005 Page: 1 > 2 > 3
EOR Injection:Disposal Injection in Field:
Chart Report Data Chart Report Data
Gas (Mcf)Water Disposed Fluids
Cumulative 0 30,420,436 Cumulative 20,085,168
2001 Total 0 5,040,067 2001 Total 714,325
2002 Total 0 5,527,361 2002 Total 468,872
2003 Total 0 5,555,184 2003 Total 552,674
2004 Total 0 5,975,291 2004 Total 684,182
2003 Rate (per day) 0 15,220 2003 Rate (per day) 1,514
2004 Rate (per day) 0 16,371 2004 Rate (per day) 1,874
Change (%) 0 8%Change (%) 24%
Field Development Information:
Wells In Field
Type Well Status 2004 2003 2002 2001 2000
Producer Oil Producer 619 593 573 556 541
Injector Water Injector 149 156 167 203 201
Gas Injector 0 0 3 237 7
WAG Injector 333 319 295 13 221
Observation 1 1 1 1 1
Disposal 15 15 15 15 15
Non-Operating Suspended 8 10 13 9 9
Abandoned 152 143 134 127 121
Total 1277 1237 1201 1151 1125
Active Completions in Pool (Month of December):
Type Well Status 2004 2003 2002 2001 2000
Oil Producer Flowing 2 7 7 6 7
Gas Lift 0 1 0 0 0
Pump 6 0 0 0 0
Shut-In 0 0 0 0 0
Service Well Water Injector 1 1 1 1 1
Gas Injector 0 0 0 1 0
WAG Injector 0 0 0 0 0
Water Supply 0 0 0 0 0
Shut-In 1 1 1 1 1
Disposal Undef.Disposal Injector 1 1 1 2 0
Shut-In 14 13 13 12 0
Total 25 23 23 23 9
Continued: 1 > 2 > 3
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Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool
Home Orders Staff Calendar Contact Us
AOGCC Pool Statistics Kuparuk River Unit, Tabasco Oil Pool
Alaska Oil and Gas Conservation Commission > Annual Reports > Pool Statistics - 2004: Updated 11 July 2005 Page: 1 > 2 > 3
Permitted Wells in Field:
Type Well Status 2004 2003 2002 2001 2000
Development New 11 19 9 24 22
Sidetrack 7 3 5 5 10
Multilateral 16 5 1 2 3
Service New 6 11 6 15 11
Sidetrack 1 3 0 1 6
Multilateral 6 0 0 0 0
Exploration New 1 0 2 0 0
Sidetrack 0 0 0 1 0
Total 48 41 23 48 52
Reservoir Properties:
Description 2004 2003 2002 2001 2000
Reference Datum - ft. below sea level 3100 3100 3100 3100 3100
Temperature - ° F 71 71 71 71 71
Porosity - % 20 20 20 20 20
Permeability - md 1000-10000 1000-10000 1000-10000 1000-10000 1000-10000
Swi - % 30 30 30 30 30
Oil Viscosity @ Orig. Press. cp 251 251@1476 251@1476 251@1476 251@1476
Oil Viscosity @ Sat. Press. cp -----
Orig. Press. - psi 1500 1500 1500 1500 1500
Bubble Point - psi 1500 1500 1500 1500 1500
Current Reservoir Press. - psi 11000 1000 1000 1300 1300
Oil Gravity - ° API 16.5 16.5 16.5 16.5 16.5
Gas Specific Gravity (Air = 1.0).58 .58 .58 .58 .58
Gross Pay - ft.70-275 70-275 70-275 70-275 -
Net Pay - ft.110 110 110 110 110
Orig. FVF - RB/STB 1.06 1.058 1.058 1.058 1.058
Bubble Point FVF - RB/STB -----
Orig. GOR - SCF/STB 167 167 167 167 167
GOR (current yr.) - SCF/STB 124 122 146 137 106
References / Summary
Continued: 1 > 2 > 3
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State of Alaska, Oil and Gas Conservation Commission
Production History for:
Month Oil (BBL)Gas (MCF)Water (BBLDaysProd Wells
KUPARUK RIVER, TABASCO OIL Pool
Jan 1997 Dec 2004Through
KRU_2T
Apr 1998 522 1065 178 1
May 1998 40851 14705 10626 2
Jun 1998 76749 43841 4728 1
Jul 1998 79794 18395 6831 1
Aug 1998 83435 14227 159331 1
Sep 1998 33930 3233 136320 1
Oct 1998 82419 7450 1696831 1
Nov 1998 53272 3359 1956030 1
Dec 1998 31574 5408 1162016 1
Jan 1999 0 0 00 1
Feb 1999 40778 12180 344014 1
Mar 1999 92943 13708 2769554 2
Apr 1999 216422 56036 63016117 5
May 1999 245309 34232 53193153 5
Jun 1999 192150 36925 75557125 5
Jul 1999 176119 29553 136768131 5
Aug 1999 213181 29030 198462155 5
Sep 1999 176548 29353 231137150 5
Oct 1999 190690 25058 220423155 5
Nov 1999 161328 17095 134421146 5
Dec 1999 214740 21722 199988151 5
Jan 2000 218596 21663 213955154 5
Feb 2000 177861 18857 288396143 5
Mar 2000 167362 16954 278430150 5
Apr 2000 176325 17125 367238150 5
May 2000 167387 16393 412309153 5
Jun 2000 156973 17791 385476176 7
Jul 2000 155250 17715 403917186 7
Aug 2000 136003 15511 391067182 7
Sep 2000 125005 14133 404654173 7
Oct 2000 147469 16503 409172213 7
Nov 2000 141645 15353 414915203 7
Dec 2000 140691 15329 438678217 7
Jan 2001 142138 16984 405097213 7
Feb 2001 127866 17081 348378196 7
Mar 2001 126115 15368 407122217 7
Apr 2001 114754 14850 402711210 7
May 2001 116318 15595 434304213 7
Jun 2001 118814 18021 431658210 7
Jul 2001 120503 18731 433436215 7
Aug 2001 118782 17087 397195212 7
Sep 2001 115470 16535 361070210 7
Oct 2001 96542 12481 312408181 7
Nov 2001 66583 8314 160724175 7
Dec 2001 53673 9000 262903184 7
Jan 2002 51761 8693 274802183 7
Feb 2002 38736 8271 297358170 7
Mar 2002 59348 10942 705383216 7
Apr 2002 84794 14024 644853203 7
1/27/2005 Page 1 of 2
State of Alaska, Oil and Gas Conservation Commission
Production History for:
Month Oil (BBL)Gas (MCF)Water (BBLDaysProd Wells
KUPARUK RIVER, TABASCO OIL Pool
Jan 1997 Dec 2004Through
May 2002 90524 14239 556154216 7
Jun 2002 105991 14620 546160210 7
Jul 2002 108713 17662 506116217 7
Aug 2002 115076 19041 461343217 7
Sep 2002 100162 13852 249462184 7
Oct 2002 121303 18152 339739213 7
Nov 2002 107240 9571 401407190 7
Dec 2002 105353 9543 426213214 7
Jan 2003 102616 11716 392731200 7
Feb 2003 110626 12374 397569194 7
Mar 2003 113255 16807 412521207 7
Apr 2003 109473 17842 406458198 7
May 2003 109031 17203 407949217 7
Jun 2003 125683 18851 439884233 8
Jul 2003 150523 18015 455235248 8
Aug 2003 159782 15722 444457248 8
Sep 2003 165880 15651 423587240 8
Oct 2003 162993 15722 417504246 8
Nov 2003 122952 14572 352076214 8
Dec 2003 110457 13487 320262222 8
Jan 2004 83055 15343 320514172 8
Feb 2004 70134 10408 268703139 8
Mar 2004 71673 9059 288513155 8
Apr 2004 63466 8637 298185150 8
May 2004 75656 10016 329437146 8
Jun 2004 128340 14647 482214193 8
Jul 2004 159621 17781 611556217 8
Aug 2004 153842 16891 647170215 8
Sep 2004 164456 13569 587072218 8
Oct 2004 176639 17670 617734248 8
Nov 2004 163389 24195 627464240 8
Dec 2004 162052 24243 671266248 8
9735474 1328980 26189706Pad Total
9,735,474 1,328,980 26,189,706Pool Total
1/27/2005 Page 2 of 2
State of Alaska, Oil and Gas Conservation Commission
Production History for:
Month Oil (BBL)Gas (MCF)Water (BBLDaysProd Wells
Producing
KUPARUK RIVER, TABASCO OIL Pool
Jan 1958 Dec 2004
Apr 1998 522 1065 178 1
May 1998 40851 14705 10626 2
Jun 1998 76749 43841 4728 1
Jul 1998 79794 18395 6831 1
Aug 1998 83435 14227 159331 1
Sep 1998 33930 3233 136320 1
Oct 1998 82419 7450 1696831 1
Nov 1998 53272 3359 1956030 1
Dec 1998 31574 5408 1162016 1
482546 111683 51342Year Total
Feb 1999 40778 12180 344014 1
Mar 1999 92943 13708 2769554 2
Apr 1999 216422 56036 63016117 5
May 1999 245309 34232 53193153 5
Jun 1999 192150 36925 75557125 5
Jul 1999 176119 29553 136768131 5
Aug 1999 213181 29030 198462155 5
Sep 1999 176548 29353 231137150 5
Oct 1999 190690 25058 220423155 5
Nov 1999 161328 17095 134421146 5
Dec 1999 214740 21722 199988151 5
1920208 304892 1344100Year Total
Jan 2000 218596 21663 213955154 5
Feb 2000 177861 18857 288396143 5
Mar 2000 167362 16954 278430150 5
Apr 2000 176325 17125 367238150 5
May 2000 167387 16393 412309153 5
Jun 2000 156973 17791 385476176 7
Jul 2000 155250 17715 403917186 6
Aug 2000 136003 15511 391067182 6
Sep 2000 125005 14133 404654173 6
Oct 2000 147469 16503 409172213 7
Nov 2000 141645 15353 414915203 7
Dec 2000 140691 15329 438678217 7
1910567 203327 4408207Year Total
Jan 2001 142138 16984 405097213 7
Feb 2001 127866 17081 348378196 7
Mar 2001 126115 15368 407122217 7
Apr 2001 114754 14850 402711210 7
May 2001 116318 15595 434304213 7
Jun 2001 118814 18021 431658210 7
Jul 2001 120503 18731 433436215 7
Aug 2001 118782 17087 397195212 7
Sep 2001 115470 16535 361070210 7
Oct 2001 96542 12481 312408181 7
Nov 2001 66583 8314 160724175 6
Dec 2001 53673 9000 262903184 6
1317558 180047 4357006Year Total
9/21/2005 Page 1 of 2
State of Alaska, Oil and Gas Conservation Commission
Production History for:
Month Oil (BBL)Gas (MCF)Water (BBLDaysProd Wells
Producing
KUPARUK RIVER, TABASCO OIL Pool
Jan 1958 Dec 2004
Jan 2002 51761 8693 274802183 6
Feb 2002 38736 8271 297358170 7
Mar 2002 59348 10942 705383216 7
Apr 2002 84794 14024 644853203 7
May 2002 90524 14239 556154216 7
Jun 2002 105991 14620 546160210 7
Jul 2002 108713 17662 506116217 7
Aug 2002 115076 19041 461343217 7
Sep 2002 100162 13852 249462184 7
Oct 2002 121303 18152 339739213 7
Nov 2002 107240 9571 401407190 7
Dec 2002 105353 9543 426213214 7
1089001 158610 5408990Year Total
Jan 2003 102616 11716 392731200 7
Feb 2003 110626 12374 397569194 7
Mar 2003 113255 16807 412521207 7
Apr 2003 109473 17842 406458198 7
May 2003 109031 17203 407949217 7
Jun 2003 125683 18851 439884233 8
Jul 2003 150523 18015 455235248 8
Aug 2003 159782 15722 444457248 8
Sep 2003 165880 15651 423587240 8
Oct 2003 162993 15722 417504246 8
Nov 2003 122952 14572 352076214 8
Dec 2003 110457 13487 320262222 8
1543271 187962 4870233Year Total
Jan 2004 83055 15343 320514172 7
Feb 2004 70134 10408 268703139 5
Mar 2004 71673 9059 288513155 5
Apr 2004 63466 8637 298185150 5
May 2004 75656 10016 329437146 6
Jun 2004 128340 14647 482214193 7
Jul 2004 159621 17781 611556217 7
Aug 2004 153842 16891 647170215 7
Sep 2004 164456 13569 587072218 8
Oct 2004 176639 17670 617734248 8
Nov 2004 163389 24195 627464240 8
Dec 2004 160457 24422 666828248 8
1470728 182638 5745390Year Total
9,733,879 1,329,159 26,185,268Pool Total
9/21/2005 Page 2 of 2
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, TABASCO OIL Pool
Jun 1998 36537 017 1
Jul 1998 105899 031 1
Aug 1998 144329 031 1
Sep 1998 73553 020 1
Oct 1998 107540 029 1
Nov 1998 76997 029 1
Dec 1998 9390 041
Year Total 554245 0
Mar 1999 55366 024 1
Apr 1999 125181 030 1
May 1999 159069 031 1
Jun 1999 163563 030 1
Jul 1999 201518 031 1
Aug 1999 407892 031 1
Sep 1999 277335 030 1
Oct 1999 276651 053 2
Nov 1999 328031 058 2
Dec 1999 228828 042 2
Year Total 2223434 0
Jan 2000 392436 031 1
Feb 2000 413716 029 1
Mar 2000 529421 045 2
Apr 2000 550341 060 2
May 2000 511120 062 2
Jun 2000 466871 044 2
Jul 2000 476327 031 1
Aug 2000 447992 031 1
Sep 2000 432215 030 1
Oct 2000 448669 031 1
Nov 2000 447578 030 1
Dec 2000 428168 031 1
Year Total 5544854 0
Jan 2001 285363 032 2
Feb 2001 415120 028 1
Mar 2001 452441 031 1
Apr 2001 434766 030 1
May 2001 399758 030 1
Jun 2001 473242 030 1
Jul 2001 443938 031 1
Aug 2001 462240 031 1
Sep 2001 434965 030 1
Oct 2001 376982 030 1
Nov 2001 453737 030 1
Dec 2001 407515 031 1
Year Total 5040067 0
9/21/2005 Page 1 of 2
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, TABASCO OIL Pool
Jan 2002 431632 031 1
Feb 2002 462063 028 1
Mar 2002 529974 031 1
Apr 2002 486634 030 1
May 2002 507731 031 1
Jun 2002 487005 030 1
Jul 2002 498594 031 1
Aug 2002 435141 031 1
Sep 2002 407497 030 1
Oct 2002 455657 031 1
Nov 2002 403313 028 1
Dec 2002 422120 031 1
Year Total 5527361 0
Jan 2003 449719 031 1
Feb 2003 352411 028 1
Mar 2003 427339 031 1
Apr 2003 443007 030 1
May 2003 434859 031 1
Jun 2003 443540 030 1
Jul 2003 531115 031 1
Aug 2003 522050 031 1
Sep 2003 492965 030 1
Oct 2003 516719 031 1
Nov 2003 461582 030 1
Dec 2003 479878 031 1
Year Total 5555184 0
Jan 2004 470520 031 1
Feb 2004 409417 029 1
Mar 2004 418090 031 1
Apr 2004 389006 030 1
May 2004 421183 031 1
Jun 2004 443645 030 1
Jul 2004 548515 031 1
Aug 2004 568118 031 1
Sep 2004 527260 030 1
Oct 2004 601938 031 1
Nov 2004 575615 030 1
Dec 2004 601984 031 1
Year Total 5975291 0
Pool Total 30,420,436 0
9/21/2005 Page 2 of 2
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Apr 1982 18024 030 1
May 1982 14292 023 1
Jun 1982 12643 030 1
Jul 1982 15259 031 1
Aug 1982 22348 030 1
Sep 1982 27175 031 1
Oct 1982 13731 030 1
Nov 1982 2895 030 1
Dec 1982 825 031 1
Year Total 127192 0
Jan 1983 2004 031 1
Feb 1983 6549 028 1
Mar 1983 8846 031 1
Apr 1983 18223 030 1
May 1983 39076 031 1
Jun 1983 48507 030 1
Jul 1983 49670 031 1
Aug 1983 57968 031 1
Sep 1983 91688 030 1
Oct 1983 104766 031 1
Nov 1983 85334 030 1
Dec 1983 92638 031 1
Year Total 605269 0
Jan 1984 99362 031 1
Feb 1984 101283 029 1
Mar 1984 123472 031 1
Apr 1984 169478 030 1
May 1984 221495 031 1
Jun 1984 209499 030 1
Jul 1984 213715 031 1
Nov 1984 9933 030 1
Year Total 1148237 0
Jun 1986 92314 060 2
Jul 1986 65039 045 2
Aug 1986 78742 045 2
Sep 1986 22721 033 2
Oct 1986 2994 091
Nov 1986 181 021
Dec 1986 1466 031
Year Total 263457 0
1/31/2005 Page 1 of 7
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Jan 1987 23209 035 2
Feb 1987 19867 031 2
Mar 1987 25900 040 2
Apr 1987 19308 040 2
May 1987 21848 051 2
Jun 1987 41421 043 2
Jul 1987 45896 052 2
Aug 1987 30063 045 2
Sep 1987 60763 040 2
Oct 1987 14935 042 2
Nov 1987 35988 053 2
Dec 1987 21397 042 2
Year Total 360595 0
Jan 1988 27173 031 1
Feb 1988 20692 029 1
Mar 1988 19351 031 1
Apr 1988 17864 030 1
May 1988 21209 030 1
Jun 1988 70768 053 3
Jul 1988 42991 031 1
Aug 1988 42437 030 1
Sep 1988 61179 039 2
Oct 1988 22197 029 1
Nov 1988 11650 024 1
Dec 1988 15287 027 1
Year Total 372798 0
Jan 1989 19062 028 1
Feb 1989 16832 023 1
Mar 1989 18471 029 1
Apr 1989 38398 030 1
May 1989 49183 031 1
Jun 1989 59425 030 1
Jul 1989 28335 031 1
Aug 1989 52219 039 2
Sep 1989 75356 030 1
Oct 1989 36890 031 1
Nov 1989 24224 028 1
Dec 1989 25380 031 1
Year Total 443775 0
1/31/2005 Page 2 of 7
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Jan 1990 24735 031 1
Feb 1990 28980 025 1
Mar 1990 35995 030 1
Apr 1990 35585 030 1
May 1990 130943 055 9
Jun 1990 1143291 0270 9
Jul 1990 396686 0135 9
Aug 1990 84540 031 1
Sep 1990 49185 030 1
Oct 1990 27690 028 1
Nov 1990 20950 030 1
Dec 1990 23850 030 1
Year Total 2002430 0
Jan 1991 31265 037 2
Feb 1991 24588 031 2
Mar 1991 37067 042 2
Apr 1991 36158 036 3
May 1991 40144 030 1
Jun 1991 833116 0261 9
Jul 1991 1032021 0283 10
Aug 1991 135310 079 10
Sep 1991 72725 058 2
Oct 1991 56607 060 3
Nov 1991 47655 059 2
Dec 1991 63261 061 3
Year Total 2409917 0
Jan 1992 58821 063 3
Feb 1992 79120 087 4
Mar 1992 130882 0120 4
Apr 1992 113728 0114 4
May 1992 70386 069 4
Jun 1992 1246638 0290 11
Jul 1992 230965 0100 10
Aug 1992 32712 031 1
Sep 1992 34181 028 1
Oct 1992 28891 031 1
Nov 1992 21260 028 1
Dec 1992 42818 048 2
Year Total 2090402 0
1/31/2005 Page 3 of 7
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Jan 1993 65534 066 3
Feb 1993 96858 080 3
Mar 1993 92664 086 3
Apr 1993 103002 064 3
May 1993 80928 059 2
Jun 1993 742848 0189 9
Jul 1993 648729 0157 9
Aug 1993 26195 027 2
Sep 1993 44602 045 2
Oct 1993 30627 028 2
Nov 1993 45721 039 2
Dec 1993 40465 038 2
Year Total 2018173 0
Jan 1994 26877 028 2
Feb 1994 46530 048 3
Mar 1994 56629 057 3
Apr 1994 52519 053 2
May 1994 37390 031 1
Jun 1994 809031 0177 9
Jul 1994 963869 0197 8
Aug 1994 21040 027 1
Sep 1994 16845 022 1
Oct 1994 16275 024 1
Nov 1994 13520 020 1
Dec 1994 45933 049 2
Year Total 2106458 0
Jan 1995 45473 051 3
Feb 1995 36906 037 2
Mar 1995 34570 042 2
Apr 1995 24815 038 2
May 1995 20496 029 2
Jun 1995 212537 077 5
Jul 1995 15060 020 1
Aug 1995 76102 034 4
Sep 1995 17520 027 2
Oct 1995 15288 020 2
Nov 1995 21755 025 2
Dec 1995 46863 051 2
Year Total 567385 0
1/31/2005 Page 4 of 7
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Jan 1996 31187 031 2
Feb 1996 41157 044 3
Mar 1996 39553 049 2
Apr 1996 46355 047 2
May 1996 25341 027 1
Jun 1996 22318 025 2
Jul 1996 27346 030 2
Aug 1996 131324 048 4
Sep 1996 26263 022 1
Oct 1996 8503 062
Nov 1996 12139 091
Dec 1996 37944 031 3
Year Total 449430 0
Jan 1997 27016 043 2
Feb 1997 37282 042 3
Mar 1997 46553 049 3
Apr 1997 35423 035 2
May 1997 31119 031 3
Jun 1997 49049 036 2
Jul 1997 53566 041 2
Aug 1997 19620 030 2
Sep 1997 195492 035 6
Oct 1997 40484 036 2
Nov 1997 60432 046 2
Dec 1997 76538 050 2
Year Total 672574 0
Jan 1998 58560 048 2
Feb 1998 50144 044 3
Mar 1998 71032 043 2
Apr 1998 78197 050 3
May 1998 48338 050 2
Jun 1998 75187 052 3
Jul 1998 38424 043 2
Aug 1998 69453 043 6
Sep 1998 126422 057 6
Oct 1998 62825 049 2
Nov 1998 43230 042 2
Dec 1998 86379 049 2
Year Total 808191 0
1/31/2005 Page 5 of 7
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Jan 1999 60899 048 2
Feb 1999 27979 027 1
Mar 1999 54647 039 2
Apr 1999 42163 044 2
May 1999 24714 041 2
Jun 1999 25136 041 2
Jul 1999 19960 028 2
Aug 1999 23241 034 2
Sep 1999 47500 039 2
Oct 1999 22625 037 2
Nov 1999 44215 037 2
Dec 1999 28100 041 2
Year Total 421179 0
Jan 2000 54945 047 2
Feb 2000 42510 043 2
Mar 2000 58762 044 2
Apr 2000 62560 046 2
May 2000 54197 044 2
Jun 2000 51946 041 2
Jul 2000 98563 048 4
Aug 2000 165462 065 5
Sep 2000 49944 035 2
Oct 2000 59235 041 2
Nov 2000 51703 038 3
Dec 2000 47826 041 2
Year Total 797653 0
Jan 2001 41502 041 2
Feb 2001 73510 035 2
Mar 2001 72758 045 2
Apr 2001 55982 043 2
May 2001 64773 050 2
Jun 2001 69020 048 3
Jul 2001 65315 035 2
Aug 2001 50240 040 3
Sep 2001 45411 042 2
Oct 2001 56438 040 2
Nov 2001 53841 038 2
Dec 2001 65535 040 2
Year Total 714325 0
1/31/2005 Page 6 of 7
State of Alaska, Oil and Gas Conservation Commission
Injection History for:
Month Liquid (BBL)Gas (MCF)DaysInj Wells
Injecting
KUPARUK RIVER, CRETACEO U WDSP Pool
Jan 2002 44173 039 2
Feb 2002 44135 037 3
Mar 2002 65221 044 2
Apr 2002 37600 039 2
May 2002 42845 037 2
Jun 2002 43411 030 1
Jul 2002 30549 027 1
Aug 2002 41685 027 1
Sep 2002 21635 028 1
Oct 2002 29783 030 1
Nov 2002 26415 024 1
Dec 2002 41420 028 1
Year Total 468872 0
Jan 2003 35776 031 2
Feb 2003 51754 029 2
Mar 2003 86226 031 1
Apr 2003 72975 030 1
May 2003 48587 030 1
Jun 2003 34944 032 2
Jul 2003 60628 031 1
Aug 2003 44341 030 1
Sep 2003 41574 029 1
Oct 2003 26107 025 1
Nov 2003 18782 023 1
Dec 2003 30980 026 1
Year Total 552674 0
Jan 2004 34700 030 1
Feb 2004 58826 028 1
Mar 2004 98377 031 1
Apr 2004 73684 030 1
May 2004 52856 031 1
Jun 2004 40480 029 1
Jul 2004 40793 028 1
Aug 2004 53779 029 1
Sep 2004 38873 029 1
Oct 2004 56287 031 1
Nov 2004 70730 030 1
Dec 2004 64797 031 1
Year Total 684182 0
Pool Total 20,085,168 0
1/31/2005 Page 7 of 7
Arctic Ocean
9 E12 N7 E14 N10 N8 NKuparuk River Unit
Meltwater PA
Tarn PA
Tabasco PA
Kuparuk PA
West Sak PA
N
AOGCC
Kuparuk River Unit
LOCATION MAP
0 6
miles
Deadhorse
Harrison Bay
Dalton HwyTrans-AlaskaPipelineNuiqsut
NPRA
B e a u f o r t S e a
North Slope, Alaska
Tabasco
Oil Pool
Modified from
AK DNR Div. Oil & Gas 2005
NORTHSTAR UNIT
DUCK ISLAND UNITCOLVILLE RIVER
UNIT
MILNE POINT
UNIT
KUPARUK RIVER
UNIT
PRUDHOE BAY UNIT
OOOGURUK
UNIT
TUVAAQ
UNIT
NIKAITCHUQ
UNIT
Reference List
KUPARUK RIVER, TABASCO OIL
Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 435,
available online at:
http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435.htm
Alaska Oil and Gas Conservation Commission, 2003, Conservation Order No. 435a,
available online at:
http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435a.htm
Alaska Oil and Gas Conservation Commission, 2005, Production Database
BP, 1998, Companies to Increase Production from New 'TABASCO' North Slope Oil
Field, BP Press Release, date: 27 August 1998;
http://www.bp.com/genericarticle.do?categoryId=120&contentId=2001177
Walker, J., 1998, Testimony in support of the Application of ARCO Alaska Inc. for a
Public Hearing to Present Testimony to Define and Develop the Tabasco Oil Pool Rules,
Alaska Oil and Gas Conservation Commission Conservation Order 435 file.
2/7/2005 Page 1 of 1
Tabasco Oil Pool
Summary
The Tabasco Oil Pool is one of the satellite pools that have been discovered and
developed utilizing Kuparuk River Unit (“KRU”) infrastructure.1 The pool was
discovered in 1986 during development drilling of the underlying Kuparuk River
Oil Pool from the KRU 2T-Pad.2 The Tabasco Sandstone underlies a large
portion of the southern and western KRU. Producible hydrocarbons were
encountered in the Tabasco Sandstone between 3,352’ to 3,599’ measured
depth (“MD”) in the KRU 2T-201 well.3 The Tabasco pool lies at approximately
3,000’ true vertical depth subsea (“TVDSS”)4, about 300’ to 400’ below the West
Sak sands.5 Tabasco oil has an API gravity of 16 degrees, and it is highly
viscous (253 centipoise). No definitive oil-water contacts have been delineated
within pool. Original oil in place (“OOIP”) for the 2T-Pad area is projected at 48
to 131 million barrels of oil (“MMSTB”). A small gas cap of about 32 acres occurs
in the 2T-201 area, with the gas-oil contact at 2,915’ TVDSS. The gas cap
contains an estimated 100 MMSCF of gas in place, but is not expected to have a
major impact on reservoir performance.6 Regular production began in April of
1998 from the 2T-Pad. Production peaked in May 1999 at an average of 7,913
barrels of oil per day (“BOPD”), and declined to 5,227 BOPD in December 2004.7
Geology
The Tabasco Sandstone is an informal member of the Late Cretaceous-aged
(Campanian) Schrader Bluff Formation. It was deposited near a shelf margin as
a prograding sequence of deltaic to near shore marine sediments. The
sandstone is discontinuously distributed over a broad region, with sand thickness
generally most significant along the shelf margin. Large-scale slumping and
erosion are common. Two lithologies are present: a discontinuous thin-bedded
sandstone facies with shale interbeds and an overlying amalgamated sandstone
facies. The thin-bedded sandstone facies is more widespread; its gross interval
thickness is about 80’ to 400’. The amalgamated sandstone facies ranges in
thickness between 45’ to 350’ thick. The transition between the two facies is
abrupt. Porosity ranges from 17 to 22% and averages 20%. Log water
saturation ranges from 17 to 60%, with 20 to 25% representative of the 2T-Pad
area. Pressure transient permeability ranges from 3 to 100 Darcies. The
Tabasco structure is a monocline, dipping east to northeast and striking north to
northwest in the western portion of the KRU and east to southeast in the
southern portion.8 The hydrocarbon-trapping mechanism is a combination of
stratigraphic and structural elements. The Tabasco accumulation is cut by a
series of north-south and east-west normal faults, with throws typically ranging
between 10’ to 50’ and maximum throws to 100’. Oil distribution appears
controlled by the stratigraphic distribution of reservoir sands. 9
SFD
Revised Feb. 7, 2005
1 Alaska Oil and Gas Conservation Commission, 2003, Conservation Order No. 435a, available
online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435a.htm 2 BP, 1998, Companies to Increase Production from New 'TABASCO' North Slope Oil Field, BP
Press Release, date: 27 August 1998;
http://www.bp.com/genericarticle.do?categoryId=120&contentId=2001177 3 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 435, available
online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435.htm 4 Walker, J., 1998, Testimony in support of the Application of ARCO Alaska Inc. for a Public
Hearing to Present Testimony to Define and Develop the Tabasco Oil Pool Rules, Alaska Oil and
Gas Conservation Commission Conservation Order 435 file. 5 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 435, available
online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435.htm 6 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 435, available
online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435.htm 7 Alaska Oil and Gas Conservation Commission, 2005, Production Database 8 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 435, available
online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435.htm 9 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 435, available
online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co435.htm
AAOrder No.DateOperator Description Current
KUPARUK RIVER FIELD
TABASCO OIL POOL
Current Orders
494 0CO 04-Sep-03CONOCOPHILLI AOGCC on its own motion, adopted rules regulating sustained
casing pressures in development wells in all pools within the
Kuparuk River Field.
Y
435 0ACO 27-Aug-03CONOCOPHILLI Authorization to changes to Rule 7 Conservation Order 435
pertaining to Common Production Facilities and Surface
Commingling allocation methods affecting the Tabasco Oil Pool
producing with the Kuparuk River Unit.
Y
20BAIO 12-Dec-02CONOCOPHILLI Order to expand the affected area of AIO 2A for Kuparuk River Oil
Pool.
Y
435 0CO 05-Nov-98ARCO ALASKA Pool rules for development of Tabasco Oil Pool in the Kuparuk River
Field. Amended by CO 494 & CO 435A/Superseded by CO 435A.
Y
20AAIO 04-Jun-98BP EXPLORATI Approval of a pilot waterflood project within the Tabasco
accumulation in Kuparuk River Unit. Consolidation of AIO 2 and
ammendments.
Y
AAOrder No.DateOperator Description Current
KUPARUK RIVER FIELD
TABASCO OIL POOL
Obsolete Orders
26AIO 27-Jan-94ARCO ALASKA Revoked by CO AIO 2A. Amend rule 6, AIO 002 to allow additional
means for demonstrating mech integrity of inj wells.
N
25AIO 27-Dec-91ARCO ALASKA Revoked by AIO 2A. Admend Rule 2 of AIO 002.N
24AIO 20-Dec-88ARCO ALASKA Revoked by CO AIO 2A. Amends Rule 6, AIO 002 - allow RTSs as
alternate method MIT.
N
22AIO 27-Oct-86ARCO ALASKA Revoked by CO AIO 2A. Amends Rule 7, AIO 002 re pressure
communication or leakage.
N
20AIO 06-Jun-86ARCO ALASKA Revoked by CO AIO 2A. Authorizes underground injection fluids
w/in KRU for enhanced hydrocarbon recovery/disposal non-
hazardous waste fluids.
N
Tabasco
0246810Producing Oil WellsKUPARUK RIVER FIELD, TABASCO OIL POOL020406080100Water Cut ( % )KUPARUK RIVER FIELD, TABASCO OIL POOL0.10.5151050100Cum Oil Prod ( MMbbl )Cum Water Prod ( MMbbl )Cum Gas Prod ( MMMcf )KUPARUK RIVER FIELD, TABASCO OIL POOL1998992000010203040.0010.0050.010.050.10.5151050100Oil Rate (CD) ( Mbbl/d )Water Rate (CD) ( Mbbl/d )Gas Rate (CD) ( MMcf/d )Gas / Oil Ratio ( Mcf/bbl )KUPARUK RIVER FIELD, TABASCO OIL POOL
0.01.02.03.04.05.0Wells on Gas InjectionWells on Water InjectionKUPARUK RIVER FIELD, TABASCO OIL POOL - EOR INJECTION0.10.5151050100Cum Gas Inj ( MMMcf )Cum Water Inj ( MMbbl )KUPARUK RIVER FIELD, TABASCO OIL POOL - EOR INJECTION1998992000010203040.10.5151050100Gas Inj Rate (CD) ( MMcf/d )Water Inj Rate (CD) ( Mbbl/d )KUPARUK RIVER FIELD, TABASCO OIL POOL - EOR INJECTION
051015Disposal WellsKUPARUK RIVER FIELD, CRETACEOUS UNDEFINED WASTE DISPOSAL POOL0.10.5151050100Cum Water Disp ( MMbbl )KUPARUK RIVER FIELD, CRETACEOUS UNDEFINED WASTE DISPOSAL POOL1982 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 2000 01 02 03 04100101102103104105Waste Disposal Rate ( bbl/d )KUPARUK RIVER FIELD, CRETACEOUS UNDEFINED WASTE DISPOSAL POOL
