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HomeMy WebLinkAboutOil-PBU-AuroraAlaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Home Orders Staff Calendar Contact Us AOGCC Pool Statistics Prudhoe Bay Unit, Aurora Oil Pool Alaska Oil and Gas Conservation Commission > Annual Reports > Pool Statistics - 2004: Updated 25 July 2005 Page: 1 > 2 > 3 Operator: BP Exploration (Alaska) Inc. Discovery Well: Mobil Oil Corporation North Kuparuk State No. 26-12-12 Permit #169-057 API No. 50-029-20032-00-00 Sec. 26, T12N, R12E, UM Depth: 10,311’ MD / TVD August 24, 1969 Status: Producing Location: Central Arctic Slope Area Location Map Pool Location Map Orders: Complete List Summary: The Aurora Oil Pool ("AOP") is located within the current boundaries of the Prudhoe Bay Unit ("PBU"), and it lies within the Kuparuk River Formation (“Kuparuk”). The pool comprises the accumulation of hydrocarbons that is common to, and correlates with, the interval between 6859' and 7254' measured depth in PBU V-200. The pool was discovered in 1969 by the Mobil Oil Corporation Mobil-Phillips North Kuparuk State No. 26-12-12, where the same accumulation lies between the measured depths of 6,765’ and 7,765’. Development of the pool is from the PBU S-Pad. Production from pool began in November 2000, and has continued without interruption. As new producers have been added (from one in November 2000 to 14 in December 2004), production has steadily increased, but water production has also increased significantly since September 2003. Geology: Within the pool, the Kuparuk comprises early Cretaceous-aged marine shoreface and offshore sediments that consist of very fine to medium grained, quartz-rich sandstone with interbedded siltstone and mudstone. The Kuparuk is stratigraphically complex, characterized by multiple unconformities, changes in thickness and sedimentary facies, and local diagenetic cementation. In the AOP, the Kuparuk reservoir is divided into three stratigraphic intervals, that are named, from deepest to shallowest, A, B and C. The A interval contains two reservoir quality sub-intervals, the A-4 and A-5 sands, which are typically 30’ and 20’ thick, respectively. The B interval is dominated by siltstone and sandy mudstone with numerous discontinuous thin sandstone lenses, which are up to 3’ thick. The C interval, contains the primary reservoir sands of the pool, and it consists of thick, amalgamated sands, with high net to gross ratios. Average layer properties range between 16% for the A sand net pay interval, and 25% for C sand net pay intervals. The average permeabilities for these layers range from 12 md to 158 md. The AOP structure is a NW to SE-trending ridge that is broken by N-S trending faults having vertical displacements ranging up to hundreds of feet. The traps for oil and gas are created by a combination of structural and stratigraphic features: the accumulation is bounded to the W by several faults, to the E and SE by unconformities, and to the SW and N by oil-water contacts. The reservoir appears to be compartmentalized, and fluid contacts (oil/water and gas/oil) appear to be variable across the pool. The reservoir is compartmentalized, and fluid contacts (oil/water and gas/oil) appear to be variable across the pool. The reservoir temperature is about 150 degrees F at 6700’ true vertical feet subsea. Oil gravity ranges from 25.2 to 29.1 degrees API. Original oil in place (“OOIP”) is estimated to be 110 to 146 MMSTB. Strat Column Orig. Oil in Place: 110 to 146 MMSTB (CO 457) Production: Prod Chart Prod Report Prod Data Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls) Cumulative 11,397,395 0 47,582,920 5,151,440 2001 Total 1,737,981 0 12,051,741 389,741 http://www.state.ak.us/local/akpages/ADMIN/ogc/...20Oil/Prudhoe%20Bay,%20Aurora%20Oil/1_Oil_1.htm (1 of 2) [3/28/2008 5:20:34 PM] Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool 2002 Total 2,397,003 0 12,609,285 660,338 2003 Total 3,782,231 0 11,970,575 1,229,997 2004 Total 3,219,105 0 9,868,761 2,869,485 2003 Rate (b/d) 10,362 0 32,796 3,370 2004 Rate (b/d)8,819 0 27,038 7,862 Change (%)-15%0 -18%133% Continued: 1 > 2 > 3 Home Orders Staff Calendar Contact Us Webmaster http://www.state.ak.us/local/akpages/ADMIN/ogc/...20Oil/Prudhoe%20Bay,%20Aurora%20Oil/1_Oil_1.htm (2 of 2) [3/28/2008 5:20:34 PM] Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Home Orders Staff Calendar Contact Us AOGCC Pool Statistics Prudhoe Bay Unit, Aurora Oil Pool Alaska Oil and Gas Conservation Commission > Annual Reports > Pool Statistics - 2004: Updated 25 July 2005 Page: 1 > 2 > 3 EOR Injection:Disposal Injection in Field: Chart Report Data Chart Report Data Gas (Mcf)Water Disposed Fluids Cumulative 5,751,940 16,285,476 Cumulative 1,769,881,704 2001 Total 0 108,950 2001 Total 95,999,818 2002 Total 0 3,485,844 2002 Total 86,728,378 2003 Total 356,898 7,284,988 2003 Total 65,920,644 2004 Total 5,395,042 5,405,694 2004 Total 56,340,325 2003 Rate (per day) 978 19,959 2003 Rate (per day) 180,605 2004 Rate (per day) 14,781 14,810 2004 Rate (per day) 154,357 Change (%) 1,411% -26%Change (%) -15% Field Development Information: Wells In Field Type Well Status 2004 2003 2002 2001 2000 Producer Oil Producer 1326 1248 1231 1209 1145 Injector Water Injector 99 81 74 62 57 Gas Injector 38 38 38 40 41 WAG Injector 176 161 156 144 138 Water Supply 2 1 1 2 2 Observation 12 12 11 12 12 Disposal 20 20 20 21 21 Non-Operating Op Shut Down 1 0 0 0 0 Suspended 30 30 49 52 34 Abandoned 853 771 692 627 583 Total 2557 2362 2272 2169 2031 Active Completions in Pool (Month of December): Type Well Status 2004 2003 2002 2001 2000 Oil Producer Flowing 2 4 3 3 2 Gas Lift 7 5 4 4 1 Shut-In 5 1 2 2 0 Service Well Water Injector 6 4 1 1 0 Gas Injector 0 0 0 0 0 WAG Injector 1 2 0 0 0 Water Supply 0 0 0 0 0 Shut-In 1 0 0 0 0 Disposal Undef.Disposal Injector 13 13 16 16 16 Shut-In 7 7 7 4 4 Total 42 36 30 30 23 Continued: 1 > 2 > 3 Home Orders Staff Calendar Contact Us Webmaster http://www.state.ak.us/local/akpages/ADMIN/ogc/ann...0-%20Oil/Prudhoe%20Bay,%20Aurora%20Oil/1_Oil_2.htm [3/28/2008 5:20:39 PM] Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Home Orders Staff Calendar Contact Us AOGCC Pool Statistics Prudhoe Bay Unit, Aurora Oil Pool Alaska Oil and Gas Conservation Commission > Annual Reports > Pool Statistics - 2004: Updated 25 July 2005 Page: 1 > 2 > 3 Permitted Wells in Field: Type Well Status 2004 2003 2002 2001 2000 Development New 9 12 17 19 8 Sidetrack 62 62 58 67 67 Multilateral 18 10 14 3 4 Service New 12 7 17 6 1 Sidetrack 8 3 1 8 7 Multilateral 0 0 0 0 0 Exploration New 0 0 1 0 0 Sidetrack 0 0 0 0 0 Total 109 94 108 103 87 Reservoir Properties: Description 2004 2003 2002 2001 2000 Reference Datum - ft. below sea level 6700 6700 6700 6700 6700 Temperature - ° F 150 150 150 150 150 Porosity - % 16-25 16-25 16-25 16-25 16-25 Permeability - md 10-200 10-200 10-200 10-200 10-200 Swi - % 14-60 14-60 14-60 14-60 30-60 Oil Viscosity @ Orig. Press. cp .72 .72 .72 .72 .72 Oil Viscosity @ Sat. Press. cp ----- Orig. Press. - psi 3350-3433 3350-3433 3433 3433 3433 Bubble Point - psi 3300-3433 3300-3433 3433 3433 3433 Current Reservoir Press. - psi 2760-3100 2760-3100 2530-3430 2530-3430 - Oil Gravity - ° API 25-30 25-30 25-30 25-30 25-30 Gas Specific Gravity (Air = 1.0).72 .72 .72 .72 .72 Gross Pay - ft.95 95 95 95 95 Net Pay - ft.60 60 60 60 60 Orig. FVF - RB/STB 1.35 1.35 1.35 1.35 1.35 Bubble Point FVF - RB/STB ----- Orig. GOR - SCF/STB 717 717 717 717 717 GOR (current yr.) - SCF/STB 3065 3165 5260 6934 4147 References / Summary Continued: 1 > 2 > 3 Home Orders Staff Calendar Contact Us Webmaster http://www.state.ak.us/local/akpages/ADMIN/ogc/ann...0-%20Oil/Prudhoe%20Bay,%20Aurora%20Oil/1_Oil_3.htm [3/28/2008 5:20:44 PM] State of Alaska, Oil and Gas Conservation Commission Production History for: Month Oil (BBL)Gas (MCF)Water (BBLDaysProd Wells PRUDHOE BAY, AURORA OIL Pool Jan 1999 Dec 2004Through PBU_S Nov 2000 67004 82879 6812 1 Dec 2000 194071 999679 181163 3 Jan 2001 175370 1153307 11971 3 Feb 2001 125310 971908 13253 3 Mar 2001 138305 1198643 264572 6 Apr 2001 188696 1336778 3355154 6 May 2001 116191 796912 25085152 6 Jun 2001 123398 771320 3809136 6 Jul 2001 122764 807157 3374695 5 Aug 2001 138733 872625 55901136 6 Sep 2001 99629 672017 42643101 6 Oct 2001 188000 1140663 70016165 9 Nov 2001 149259 1072005 72711157 9 Dec 2001 172326 1258406 79579159 9 Jan 2002 163168 1455944 89838182 9 Feb 2002 120180 662643 85461136 9 Mar 2002 225107 1262013 71246190 9 Apr 2002 190077 1114180 63277152 9 May 2002 186534 1131368 41044163 7 Jun 2002 200555 1077855 44759161 7 Jul 2002 171466 783457 46460127 7 Aug 2002 251574 1209696 47143206 8 Sep 2002 150402 760616 27975110 8 Oct 2002 266704 1131750 48714230 9 Nov 2002 225338 765490 37951206 9 Dec 2002 245898 1254273 56470235 10 Jan 2003 236112 931786 64601182 10 Feb 2003 266831 1180495 60245239 12 Mar 2003 307379 1024039 67707265 12 Apr 2003 368908 1084649 71260270 11 May 2003 300348 840115 68268206 12 Jun 2003 337021 1477084 65690208 12 Jul 2003 316248 1132588 86411223 10 Aug 2003 276772 679345 75467194 10 Sep 2003 276179 646260 107448189 10 Oct 2003 342038 917404 103225203 10 Nov 2003 358499 952016 143804243 10 Dec 2003 395896 1104794 315871279 10 Jan 2004 346691 1045217 299429271 10 Feb 2004 307438 855616 255825245 10 Mar 2004 315311 842588 283906246 10 Apr 2004 316073 1070798 285698268 11 May 2004 348318 1033190 294990282 13 Jun 2004 316362 985796 251050267 13 Jul 2004 315320 1036021 244244284 13 Aug 2004 110729 469644 81348109 13 Sep 2004 132568 448881 136695104 13 Oct 2004 240842 807586 288268202 13 Nov 2004 218983 567358 226970180 13 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 PRUDHOE BAY, AURORA OIL Pool Jan 1999 Dec 2004Through Dec 2004 250470 706066 221062205 14 11397395 47582920 5151440Pad Total 11,397,395 47,582,920 5,151,440Pool Total 1/27/2005 Page 2 of 2 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, AURORA OIL Pool Dec 2001 108950 023 1 Year Total 108950 0 Jan 2002 230370 031 1 Feb 2002 369690 028 1 Mar 2002 412062 031 1 Apr 2002 149381 030 1 May 2002 166567 038 3 Jun 2002 312947 078 3 Jul 2002 308387 093 3 Aug 2002 287135 082 3 Sep 2002 99474 057 3 Oct 2002 480263 093 3 Nov 2002 331693 090 3 Dec 2002 337875 089 3 Year Total 3485844 0 Jan 2003 295195 090 3 Feb 2003 334565 082 3 Mar 2003 575520 0120 4 Apr 2003 696598 0120 4 May 2003 605187 0100 4 Jun 2003 593120 096 5 Jul 2003 759950 0109 4 Aug 2003 827891 0186 6 Sep 2003 840855 0178 6 Oct 2003 509207 0157 6 Nov 2003 685471 0175 6 Dec 2003 561429 356898186 6 Year Total 7284988 356898 Jan 2004 439352 582320186 6 Feb 2004 377635 546765174 6 Mar 2004 380085 809379186 6 Apr 2004 351469 682790180 6 May 2004 345507 505263166 6 Jun 2004 529892 168754170 6 Jul 2004 528660 328090177 6 Aug 2004 181306 11033065 7 Sep 2004 357492 237941112 7 Oct 2004 571174 474461216 8 Nov 2004 664387 511356226 8 Dec 2004 678735 437593217 7 Year Total 5405694 5395042 Pool Total 16,285,476 5,751,940 2/3/2005 Page 1 of 1 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jun 1977 24 014 1 Aug 1977 116 031 1 Sep 1977 5996 061 Oct 1977 4018 082 Nov 1977 15271 021 2 Dec 1977 11336 027 2 Year Total 36761 0 Jan 1978 16047 023 2 Feb 1978 14489 018 2 Mar 1978 23778 037 2 Apr 1978 50185 049 2 May 1978 55681 048 2 Jun 1978 70174 0101 4 Jul 1978 96961 0106 4 Aug 1978 143915 0159 6 Sep 1978 182225 0165 6 Oct 1978 200149 0163 6 Nov 1978 234590 0153 6 Dec 1978 364987 0209 8 Year Total 1453181 0 Jan 1979 333153 0186 6 Feb 1979 205402 0159 6 Mar 1979 342092 0177 7 Apr 1979 423094 0194 7 May 1979 789621 0214 7 Jun 1979 650649 0160 7 Jul 1979 551123 0205 7 Aug 1979 623887 0192 8 Sep 1979 519533 0185 7 Oct 1979 628153 0165 7 Nov 1979 950728 0180 6 Dec 1979 950475 0241 8 Year Total 6967910 0 Jan 1980 1056360 0248 8 Feb 1980 828116 0229 8 Mar 1980 913644 0247 8 Apr 1980 873495 0235 8 May 1980 966967 0246 8 Jun 1980 900038 0217 8 Jul 1980 805475 0256 10 Aug 1980 775393 0277 10 Sep 1980 811550 0269 9 Oct 1980 806263 0245 9 Nov 1980 712271 0252 10 Dec 1980 1037675 0340 12 Year Total 10487247 0 5/20/2005 Page 1 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1981 1030645 0286 10 Feb 1981 897687 0269 10 Mar 1981 1583960 0308 10 Apr 1981 745810 0288 10 May 1981 944951 0260 10 Jun 1981 920548 0239 9 Jul 1981 1015870 0264 9 Aug 1981 1031964 0261 10 Sep 1981 913994 0206 10 Oct 1981 1120701 0261 9 Nov 1981 955284 0269 9 Dec 1981 1139961 0320 12 Year Total 12301375 0 Jan 1982 1176058 0266 10 Feb 1982 1113410 0237 9 Mar 1982 1181865 0260 9 Apr 1982 1019870 0247 9 May 1982 1013475 0265 10 Jun 1982 935270 0242 9 Jul 1982 1010406 0216 9 Aug 1982 813890 0213 9 Sep 1982 685471 0219 9 Oct 1982 942130 0245 9 Nov 1982 741901 0233 9 Dec 1982 847515 0313 11 Year Total 11481261 0 Jan 1983 915216 0258 9 Feb 1983 732954 0229 9 Mar 1983 605179 0263 10 Apr 1983 606320 0249 10 May 1983 753514 0276 10 Jun 1983 583719 0244 10 Jul 1983 543251 0230 10 Aug 1983 337906 0181 9 Sep 1983 557100 0205 7 Oct 1983 629393 0216 9 Nov 1983 545013 0242 9 Dec 1983 728798 0313 11 Year Total 7538363 0 5/20/2005 Page 2 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1984 591240 0254 9 Feb 1984 748856 0244 9 Mar 1984 749050 0233 9 Apr 1984 868403 0237 8 May 1984 842018 0245 8 Jun 1984 657818 0135 6 Jul 1984 637934 0176 6 Aug 1984 793503 0182 6 Sep 1984 977779 0180 6 Oct 1984 704279 0178 6 Nov 1984 1163384 0149 5 Dec 1984 1529912 0217 7 Year Total 10264176 0 Jan 1985 1218898 0132 5 Feb 1985 1897716 0137 5 Mar 1985 2038342 0155 5 Apr 1985 1361191 0149 5 May 1985 1729952 0155 5 Jun 1985 1836574 0150 5 Jul 1985 1648967 0150 6 Aug 1985 1875496 0124 5 Sep 1985 2114234 0150 5 Oct 1985 2429002 0155 5 Nov 1985 2339541 0150 6 Dec 1985 2768539 0186 6 Year Total 23258452 0 Jan 1986 3363067 0155 5 Feb 1986 1252054 0112 4 Mar 1986 1150628 0100 4 Apr 1986 1662727 0120 4 May 1986 1584015 0124 4 Jun 1986 1516993 0120 5 Jul 1986 1356647 0124 4 Aug 1986 1242331 0190 7 Sep 1986 1108333 0174 8 Oct 1986 1372134 0195 8 Nov 1986 1710503 0203 9 Dec 1986 2136407 0255 10 Year Total 19455839 0 5/20/2005 Page 3 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1987 2426322 0194 8 Feb 1987 1907415 0164 8 Mar 1987 1787665 0189 8 Apr 1987 1901125 0178 8 May 1987 1690215 0193 8 Jun 1987 1751221 0194 8 Jul 1987 2109697 0140 6 Aug 1987 2129253 0131 6 Sep 1987 1353772 0174 8 Oct 1987 1352428 0224 8 Nov 1987 1448521 0215 9 Dec 1987 2219314 0245 10 Year Total 22076948 0 Jan 1988 2183650 0203 8 Feb 1988 2798182 0177 7 Mar 1988 3631650 0197 8 Apr 1988 3107008 0197 8 May 1988 3261334 0224 9 Jun 1988 3639921 0248 10 Jul 1988 4425072 0279 10 Aug 1988 4681090 0279 11 Sep 1988 5493891 0275 11 Oct 1988 6163695 0288 11 Nov 1988 7113825 0268 11 Dec 1988 7911400 0327 12 Year Total 54410718 0 Jan 1989 7596746 0316 12 Feb 1989 7148217 0287 12 Mar 1989 7709831 0305 12 Apr 1989 10183365 0324 13 May 1989 10511672 0344 13 Jun 1989 9271897 0302 13 Jul 1989 8528607 0291 13 Aug 1989 9233439 0327 12 Sep 1989 8806862 0301 13 Oct 1989 10628681 0347 12 Nov 1989 10092181 0314 11 Dec 1989 11602359 0337 11 Year Total 111313857 0 5/20/2005 Page 4 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1990 11071550 0330 11 Feb 1990 10716147 0289 12 Mar 1990 12210485 0369 12 Apr 1990 8578669 0336 13 May 1990 10066426 0379 13 Jun 1990 8216402 0358 14 Jul 1990 9303909 0383 14 Aug 1990 9205078 0366 14 Sep 1990 9894936 0348 14 Oct 1990 12033347 0371 13 Nov 1990 10536981 0371 14 Dec 1990 11370769 0387 13 Year Total 123204699 0 Jan 1991 11694031 0322 11 Feb 1991 11122755 0296 12 Mar 1991 12019354 0353 12 Apr 1991 10669450 0346 12 May 1991 10726716 0343 12 Jun 1991 9524444 0389 13 Jul 1991 9281820 0375 13 Aug 1991 8803281 0379 13 Sep 1991 8025305 0323 13 Oct 1991 8238332 0306 11 Nov 1991 7797527 0309 11 Dec 1991 7828425 0313 11 Year Total 115731440 0 Jan 1992 7794178 0316 11 Feb 1992 7695525 0301 11 Mar 1992 7825986 0321 11 Apr 1992 7667838 0327 12 May 1992 7298609 0333 12 Jun 1992 8201627 0385 13 Jul 1992 7868039 0396 13 Aug 1992 6797642 0346 13 Sep 1992 7415754 0336 12 Oct 1992 7432898 0323 13 Nov 1992 6668762 0308 12 Dec 1992 6416632 0324 11 Year Total 89083490 0 5/20/2005 Page 5 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1993 7087992 0310 11 Feb 1993 6848834 0290 11 Mar 1993 7731559 0326 11 Apr 1993 8061681 0316 11 May 1993 7723277 0341 11 Jun 1993 9007163 0374 13 Jul 1993 7869557 0355 13 Aug 1993 6982513 0346 12 Sep 1993 6737095 0330 12 Oct 1993 7303022 0338 11 Nov 1993 6703842 0311 11 Dec 1993 5729513 0257 9 Year Total 87786048 0 Jan 1994 4928114 0221 8 Feb 1994 6851976 0281 11 Mar 1994 7474070 0338 11 Apr 1994 6637532 0313 11 May 1994 7539329 0319 11 Jun 1994 6360818 0328 12 Jul 1994 3539785 0310 11 Aug 1994 3503552 0319 11 Sep 1994 4905305 0326 12 Oct 1994 4555947 0270 10 Nov 1994 4485769 0320 12 Dec 1994 5412026 0320 11 Year Total 66194223 0 Jan 1995 6621454 0319 11 Feb 1995 5509703 0282 11 Mar 1995 7620904 0333 12 Apr 1995 6447500 0343 12 May 1995 6681419 0364 12 Jun 1995 6513297 0380 13 Jul 1995 6563831 0364 13 Aug 1995 4938725 0357 12 Sep 1995 4332785 0353 13 Oct 1995 4652290 0346 13 Nov 1995 5086812 0347 12 Dec 1995 6587261 0361 12 Year Total 71555981 0 5/20/2005 Page 6 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1996 7056034 0367 12 Feb 1996 7117641 0342 12 Mar 1996 7888967 0363 12 Apr 1996 6827592 0356 12 May 1996 5663958 0352 13 Jun 1996 7827567 0364 13 Jul 1996 6967246 0359 12 Aug 1996 4900409 0329 12 Sep 1996 5777161 0311 11 Oct 1996 5806923 0319 11 Nov 1996 5222613 0298 11 Dec 1996 6760233 0364 12 Year Total 77816344 0 Jan 1997 7102863 0350 12 Feb 1997 5964187 0273 12 Mar 1997 6271104 0320 11 Apr 1997 6992767 0348 12 May 1997 7352862 0339 11 Jun 1997 7973804 0330 11 Jul 1997 7469893 0335 11 Aug 1997 5939504 0339 11 Sep 1997 5812185 0329 11 Oct 1997 5225904 0336 11 Nov 1997 6089046 0333 12 Dec 1997 7639303 0372 12 Year Total 79833422 0 Jan 1998 7869228 0372 12 Feb 1998 6710090 0336 12 Mar 1998 5315506 0367 12 Apr 1998 6666241 0388 14 May 1998 9105356 0377 14 Jun 1998 8133439 0400 14 Jul 1998 7603239 0395 13 Aug 1998 6655314 0385 14 Sep 1998 5715405 0363 14 Oct 1998 7989021 0392 15 Nov 1998 7972745 0392 14 Dec 1998 7737343 0391 14 Year Total 87472927 0 5/20/2005 Page 7 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 1999 7265882 0401 14 Feb 1999 5869159 0367 15 Mar 1999 7183727 0404 15 Apr 1999 6094526 0391 15 May 1999 6259634 0403 15 Jun 1999 6313412 0387 14 Jul 1999 6248134 0343 13 Aug 1999 7047140 0373 14 Sep 1999 5107836 0329 14 Oct 1999 7245761 0374 14 Nov 1999 7211140 0352 14 Dec 1999 8349104 0374 13 Year Total 80195455 0 Jan 2000 8264654 0374 14 Feb 2000 7622673 0347 13 Mar 2000 7783396 0372 14 Apr 2000 7295103 0358 14 May 2000 7497121 0371 14 Jun 2000 6986088 0341 13 Jul 2000 6379962 0342 12 Aug 2000 5509072 0329 12 Sep 2000 6001699 0329 12 Oct 2000 5946001 0374 14 Nov 2000 6005143 0362 14 Dec 2000 6330210 0364 14 Year Total 81621122 0 Jan 2001 6815796 0374 13 Feb 2001 5614104 0338 14 Mar 2001 5177464 0371 15 Apr 2001 4787945 0359 13 May 2001 5260006 0346 14 Jun 2001 4609847 0323 13 Jul 2001 5236241 0334 13 Aug 2001 4512891 0347 12 Sep 2001 4313292 0300 13 Oct 2001 4872710 0340 13 Nov 2001 5300088 0358 14 Dec 2001 6156832 0370 14 Year Total 62657216 0 5/20/2005 Page 8 of 9 State of Alaska, Oil and Gas Conservation Commission Injection History for: Month Liquid (BBL)Gas (MCF)DaysInj Wells Injecting PRUDHOE BAY, PRUD UNDEFIN WDSP Pool Jan 2002 6040291 0369 14 Feb 2002 4507218 0334 14 Mar 2002 5512863 0362 14 Apr 2002 6460584 0349 14 May 2002 5993188 0358 14 Jun 2002 5300007 0358 12 Jul 2002 4705149 0337 13 Aug 2002 4870990 0366 15 Sep 2002 3931656 0311 13 Oct 2002 5228125 0339 13 Nov 2002 4819357 0318 12 Dec 2002 4715724 0350 14 Year Total 62085152 0 Jan 2003 4045202 0344 14 Feb 2003 3881272 0287 14 Mar 2003 3643710 0324 14 Apr 2003 3206247 0290 12 May 2003 2950665 0317 12 Jun 2003 2785427 0269 11 Jul 2003 2041653 0211 10 Aug 2003 2533250 0207 10 Sep 2003 2119317 0224 11 Oct 2003 2653587 0244 11 Nov 2003 2430529 0239 11 Dec 2003 3545408 0273 11 Year Total 35836267 0 Jan 2004 3257221 0265 11 Feb 2004 2193863 0239 10 Mar 2004 2434344 0246 10 Apr 2004 3277570 0246 11 May 2004 3647690 0255 11 Jun 2004 4143818 0259 10 Jul 2004 3790725 0248 10 Aug 2004 3195134 0237 12 Sep 2004 2924637 0217 11 Oct 2004 3929154 0234 10 Nov 2004 3246153 0231 9 Dec 2004 4183012 0243 11 Year Total 40223321 0 Pool Total 1,452,343,195 0 5/20/2005 Page 9 of 9 BEECHEY PT ST 2 BEECHEY PT ST 1 TERM WELL C KUP 9-11-12 S-113B N KUP 26-12-12 S-113A S-113 S-107 S-100 S-102 S-101 S-106 S-105 S-104 S-103 S-112 S-117 S-109 S-114 S-114A S-115 S-102L1 S-120 S-118 S-110S-108 AOGCC LOCATION MAP 0 2 miles Prudhoe Bay Field Aurora Oil Pool Aurora Pool 12 E 12 N11 NN Prudhoe Bay FieldPrudhoe Bay Field BoundaryBoundary Aurora Oil Pool Deadhorse Harrison Bay Dalton HwyTrans-AlaskaPipelineNuiqsut NPRA B e a u f o r t S e a North Slope, Alaska Modified from AK DNR Div. Oil & Gas 2005 NORTHSTAR UNIT DUCK ISLAND UNIT COLVILLE RIVER UNIT MILNE POINT UNIT KUPARUK RIVER UNIT PRUDHOE BAY UNIT OOOGURUK UNIT TUVAAQ UNIT NIKAITCHUQ UNIT Reference List PRUDHOE BAY, AURORA OIL Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm Alaska Oil and Gas Conservation Commission, 2005, Production Database Bakun, F.E. and Pospisil, G., 2001, Testimony before the Alaska Oil and Gas Conservation Commission in support of the Application of BP Exploration (Alaska) Inc. to Define the Aurora Oil Pool, July 24, 2001, AOGCC Conservation Order No. 457 file. Cerveny, P.F., 2001, Testimony before the Alaska Oil and Gas Conservation Commission in support of the Application of BP Exploration (Alaska) Inc. to Define the Aurora Oil Pool, July 24, 2001, AOGCC Conservation Order No. 457 file. 9/20/2005 Page 1 of 1 Aurora Oil Pool Summary The Aurora Oil Pool ("AOP") is located within the current boundaries of the Prudhoe Bay Unit ("PBU"), and it lies within the Kuparuk River Formation (“Kuparuk”). The pool comprises the accumulation of hydrocarbons that is common to, and correlates with, the interval between 6859' and 7254' measured depth in PBU V-200.1 The structure lies between 6450' and 6850' below sea level.2 The pool was discovered in 1969 by the Mobil Oil Corporation Mobil-Phillips North Kuparuk State No. 26-12-12, where the same accumulation lies between the depths of 6,765’ and 7,765’.3 Geology Within the pool, the Kuparuk comprises Early Cretaceous-aged marine shoreface and offshore sediments that consist very fine to medium grained, quartz-rich sandstone with interbedded siltstone and mudstone. The Kuparuk is stratigraphically complex, characterized by multiple unconformities, changes in thickness and sedimentary facies, and local diagenetic cementation. In the AOP, the Kuparuk reservoir is divided into three stratigraphic intervals, that are named, from deepest to shallowest, A, B and C. The A interval contains two reservoir quality sub-intervals, the A-4 and A-5 sands, which are typically 30’ and 20’ thick, respectively. The B interval is dominated by siltstone and sandy mudstone with numerous discontinuous thin sandstone lenses, which are up to 3’ thick. The C interval contains the primary reservoir sands of the pool, and it consists of thick, amalgamated sands, with high net to gross ratios. Average layer properties range between 16% for the A sand net pay interval, and 25% for C sand net pay intervals. The average permeabilities for these layers range from 12 md to 158 md.4 The AOP structure is a NW to SE-trending ridge that is broken by N-S trending faults5 having vertical displacements ranging up to hundreds of feet.6 The traps for oil and gas are created by a combination of structural and stratigraphic features: the accumulation is bounded to the W by several faults, to the E and SE by unconformities, and to the SW and N by oil-water contacts.7 The reservoir is compartmentalized, and fluid contacts (oil-water and gas- oil) appear to be variable across the pool.8 The reservoir temperature is about 150 degrees F at 6700’ true vertical feet subsea.9 Oil gravity ranges from 25.2 to 29.1 degrees API. Original oil in place (“OOIP”) is estimated to be 110 to 146 MMSTB.10 Revised: Jan 25, 2005 1 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm 2 Cerveny, P.F., 2001, Testimony before the Alaska Oil and Gas Conservation Commission in support of the Application of BP Exploration (Alaska) Inc. to Define the Aurora Oil Pool, July 24, 2001, AOGCC Conservation Order No. 457 file. 3 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm 4 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm 5 Cerveny, P.F., 2001, Testimony before the Alaska Oil and Gas Conservation Commission in support of the Application of BP Exploration (Alaska) Inc. to Define the Aurora Oil Pool, July 24, 2001, AOGCC Conservation Order No. 457 file. 6 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm 7 Cerveny, P.F., 2001, Testimony before the Alaska Oil and Gas Conservation Commission in support of the Application of BP Exploration (Alaska) Inc. to Define the Aurora Oil Pool, July 24, 2001, AOGCC Conservation Order No. 457 file. 8 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm 9 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm 10 Alaska Oil and Gas Conservation Commission, 2001, Conservation Order No. 457, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_499/co457.htm AAOrder No.DateOperator Description Current PRUDHOE BAY FIELD AURORA OIL POOL Current Orders 457 4aCO 10-Jan-05BP EXPLORATI Extend current pilot miscible injection (MI) operations in Aurora Oil Pool Wells S-112, S-110 and S-116. Y 457 4aCO 22-Dec-04BP EXPLORATI Extend current pilot miscible injection (MI) operations in Aurora Oil Pool Wells S-112, S-110 and S-116. Corrected 1/10/05. Y 457 0BCO 09-Aug-04BP EXPLORATI Pool rules for development of the Aurora Oil Pool.Y 457 0BCO 25-Jun-04BP EXPLORATI Order expanding the affected area of the Aurora Oil Pool, Prudhoe Bay. Y 22 2BAIO 22-Feb-04BP EXPLORATI Extend current pilot miscible injection (MI) operations in Aurora Oil Pool Wells S-112, S-110 and S-116.Corrected 1/10/05. Y 457 2ACO 11-Aug-03BP EXPLORATI Authorization of the PBU Western Operating Metering Plan for allocation of production from Aurora Oil Pool. Y 457 1ACO 29-Jul-03BP EXPLORATI Conservation Order 492 amended this conservation order. This amendment further clarifies paragraph 6 of that order. Y 457 0ACO 15-May-03BP EXPLORATI Revision of Aurora Oil Pool Rules.Y 22 0BAIO 06-May-03BP EXPLORATI Amended AIO 22A. Erratum Notice was issued on May 12, 2003. Y 483 0CO 16-Jan-03BP EXPLORATI A rule to govern the operation of development wells in all pools within the Prudhoe Bay field with pressures communication or leakage in any casing, tubing, or packer. Y 457 0CO 07-Sep-01BP EXPLORATI Pool rules for development of the Aurora Oil Pool.Y 1/27/2005 AAOrder No.DateOperator Description Current PRUDHOE BAY FIELD AURORA OIL POOL Obsolete Orders 457 3ACO 11-Dec-04BP EXPLORATI Authorization to conduct a pilot miscible injection project in Aurora Oil Pool Wells S-112, S-110 and S-116. Amended by CO 492. Superseded and Replaced by CO 457B. N 22 0CAIO 25-Jun-04BP EXPLORATI Order expanding the area in which injection is authorized in the Aurora Oil Pool, Prudhoe Bay Field 6 22 1BAIO 11-May-04BP EXPLORATI Authorization to conduct a pilot miscible injection project in Aurora Oil Pool Wells S-112, S-110 and S-116. Superseded by AIO 22B. N 492 0CO 26-Jun-03BP EXPLORATI Order adopting rules regulating sustained annulus pressures in Prudhoe Bay development wells. Superseded and Replaced by CO 457B. N 22 0AAIO 03-Apr-03BP EXPLORATI Amendment to AIO 22 for an order allowing underground injection of fluids for enhanced oil recovery in Aurora Oil Pool. Superseded by AIO 22B N 22 0AIO 07-Sep-01BP EXPLORATI Authorizes underground injection of fluids for enhanced oil recovery in Aurora Oil Pool. Corrected Order distributed 9/17/02. N 1/27/2005 048121620Producing Oil WellsPRUDHOE BAY FIELD, AURORA OIL POOL020406080100Water Cut ( % )PRUDHOE BAY FIELD, AURORA OIL POOL0.10.5151050100Cum Oil Prod ( MMbbl )Cum Water Prod ( MMbbl )Cum Gas Prod ( MMMcf )PRUDHOE BAY FIELD, AURORA OIL POOL2000010203040.010.050.10.5151050100Oil Rate (CD) ( Mbbl/d )Water Rate (CD) ( Mbbl/d )Gas Rate (CD) ( MMcf/d )Gas / Oil Ratio ( Mcf/bbl )PRUDHOE BAY FIELD, AURORA OIL POOL 0246810Wells on Gas InjectionWells on Water InjectionPRUDHOE BAY FIELD, AURORA OIL POOL - EOR INJECTION0.10.5151050100Cum Gas Inj ( MMMcf )Cum Water Inj ( MMbbl )PRUDHOE BAY FIELD, AURORA OIL POOL - EOR INJECTION2001020304151050100Gas Inj Rate (CD) ( MMcf/d )Water Inj Rate (CD) ( Mbbl/d )PRUDHOE BAY FIELD, AURORA OIL POOL - EOR INJECTION 051015Disposal WellsPRUDHOE BAY FIELD, PRUDHOE UNDEFINED WASTE DISPOSAL POOL1510501005001000500010000Cum Water Disp ( MMbbl )PRUDHOE BAY FIELD, PRUDHOE UNDEFINED WASTE DISPOSAL POOL1977 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 2000 01 02 03 0410-1100101102103104105106Waste Disposal Rate ( bbl/d )PRUDHOE BAY FIELD, PRUDHOE UNDEFINED WASTE DISPOSAL POOL 0.01.02.03.0Disposal WellsPRUDHOE BAY FIELD, LISBURNE UNDEFINED WASTE DISPOSAL POOL1510501005001000Cum Water Disp ( MMbbl )PRUDHOE BAY FIELD, LISBURNE UNDEFINED WASTE DISPOSAL POOL1987 88 89 90 91 92 93 94 95 96 97 98 99 2000 01 02 03 04102103104105106Waste Disposal Rate ( bbl/d )PRUDHOE BAY FIELD, LISBURNE UNDEFINED WASTE DISPOSAL POOL