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HomeMy WebLinkAboutOil-Kuparuk-TarnAlaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Home Orders Staff Calendar Contact Us AOGCC Pool Statistics Kuparuk River Unit, Tarn 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. Bermuda No. 1 (KRU 36 10-7/1) Permit #191-001 API No. 50-103-20149-00-00 Sec. 36, T110N, R07E, UM Depth: 6,750’ MD / 6,747' TVD February 3, 1991 Status: Producing Location: Central Arctic Slope Area Location Map PA Location Map DNR Unit Map Orders: Complete List Summary: The Tarn Oil Pool lies within the Kuparuk River Unit ("KRU"), and it is defined as the accumulation of hydrocarbons common to and correlating with the intervals between the measured depths of 4376' and 5990' interval in the Bermuda #1 well (KRU 36 10-7/1). Original oil in place (“OOIP”) in the Bermuda and Cairn intervals is estimated to be is about 136 million barrels. Waterflood operations were not undertaken because of potential reservoir damage, unfavorable reservoir permeability and poor water mobility characteristics. Regular production began from the pool in July 1998. Development has been from the KRU 2N-Pad, supplemented from the 2L-Pad. Well spacing within the pool is 10 acres. In December 2004, production from the pool averaged 24,430 barrels of oil per day: 21,390 BOPD from 20 wells on 2N-Pad and 3,040 BOPD from 6 wells on 2L-Pad. Geology: The Tarn oil pool is composed of five intervals of late Cretaceous-aged marine sandstone with interbedded mudstone intervals that lie within the Seabee Formation. These five intervals are informally termed, from deepest to shallowest, Iceberg, Arete, Cairn, Bermuda, and C30. They share a common depositional environment, have similar lithologic characteristics and fluid compositions. Sand and hydrocarbon distribution within the pool is complex, with variable gross sand percentages within each interval. Not all of the potential reservoir intervals in the pool have been shown to be hydrocarbon bearing, and the primary reservoir intervals are the Bermuda and Cairn. Hydrocarbon distribution is controlled by sand distribution, with updip stratigraphic seal along the western margin of the pool area. The pool is composed of heterogeneous sandstone with shale laminations and interbeds. Sandstone is fine to very fine-grained, framework grains are principally quartz, plagioclase, zeolites, and heterolithic rock fragments. Clay content is high, ranging between 15 and 25%, and occurs primarily in the heterolithic framework of the sandstone. Porosity ranges from 18 to 27%, averages 21%, and is dominantly secondary with common microporosity. Air permeability ranges from 1 to 45 md and averages 10 md. Because of the fine-grain size and high clay content, the reservoir is susceptible to fines migration. The Tarn oil pool structure appears to be a homocline, with easterly dip ranging up to four degrees. Few faults have been found. Strat Column Orig. Oil in Place: 136 MMSTB (CO 430) Production: Prod Chart Prod Report Prod Data Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls) Cumulative 64,603,251 0 91,406,999 7,430,612 2001 Total 8,052,423 0 15,538,323 220,661 2002 Total 12,011,387 0 13,101,272 796,306 2003 Total 12,352,406 0 12,840,177 1,932,758 2004 Total 10,345,466 0 14,278,985 3,398,102 2003 Rate (b/d) 33,842 0 35,179 5,295 2004 Rate (b/d)28,344 0 39,121 9,310 Change (%)-16%0 11%76% http://www.state.ak.us/local/akpages/ADMIN/ogc/...20Oil/Kuparuk%20River,%20Tarn%20Oil/1_Oil_1.htm (1 of 2) [3/28/2008 4:58:12 PM] Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Continued: 1 > 2 > 3 Home Orders Staff Calendar Contact Us Webmaster http://www.state.ak.us/local/akpages/ADMIN/ogc/...20Oil/Kuparuk%20River,%20Tarn%20Oil/1_Oil_1.htm (2 of 2) [3/28/2008 4:58:12 PM] Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Home Orders Staff Calendar Contact Us AOGCC Pool Statistics Kuparuk River Unit, Tarn 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 101,830,355 67,067,985 Cumulative 20,085,168 2001 Total 15,039,179 11,407,384 2001 Total 714,325 2002 Total 16,755,469 21,469,824 2002 Total 468,872 2003 Total 18,430,377 17,797,291 2003 Total 552,674 2004 Total 17,356,907 13,250,085 2004 Total 684,182 2003 Rate (per day) 50,494 48,759 2003 Rate (per day) 1,514 2004 Rate (per day) 47,553 36,302 2004 Rate (per day) 1,874 Change (%) -6% -26%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 3 7 WAG Injector 333 319 295 237 221 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 0 0 0 0 0 Gas Lift 13 12 13 15 24 Pump 12 13 13 12 0 Shut-In 1 1 0 1 2 Service Well Water Injector 0 0 0 6 0 Gas Injector 0 0 0 0 0 WAG Injector 15 14 15 6 7 Water Supply 0 0 0 0 0 Shut-In 2 1 0 0 1 Disposal Undef.Disposal Injector 1 1 1 1 1 Shut-In 14 13 13 12 13 Total 58 54 54 53 48 Continued: 1 > 2 > 3 Home Orders Staff Calendar Contact Us Webmaster http://www.state.ak.us/local/akpages/ADMIN/ogc/ann...0-%20Oil/Kuparuk%20River,%20Tarn%20Oil/1_Oil_2.htm [3/28/2008 4:58:19 PM] Alaska Oil and Gas Conservation Commisssion - Pool Statistics, Unit and Pool Home Orders Staff Calendar Contact Us AOGCC Pool Statistics Kuparuk River Unit, Tarn 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 5230 5230 5230 5230 5230 Temperature - ° F 142 142 142 142 142 Porosity - % 20 20 20 20 20 Permeability - md 9 9 9 9 9 Swi - % 40 40 40 40 40 Oil Viscosity @ Orig. Press. cp .55 .55 .55 .55 .55 Oil Viscosity @ Sat. Press. cp ----- Orig. Press. - psi 2365 2365 2365 2365 2365 Bubble Point - psi 2365 2365 2365 2365 2365 Current Reservoir Press. - psi 2600 2400 2300 2365 2365 Oil Gravity - ° API 37 37 37 37 37 Gas Specific Gravity (Air = 1.0).91 .91 .91 .91 .91 Gross Pay - ft.160 160 160 160 160 Net Pay - ft.40 40 40 40 40 Orig. FVF - RB/STB 1.39 1.39 1.39 1.39 1.39 Bubble Point FVF - RB/STB ----- Orig. GOR - SCF/STB 712 712 712 712 712 GOR (current yr.) - SCF/STB 1380 1040 1091 1930 2028 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/Kuparuk%20River,%20Tarn%20Oil/1_Oil_3.htm [3/28/2008 4:58:26 PM] State of Alaska, Oil and Gas Conservation Commission Production History for: Month Oil (BBL)Gas (MCF)Water (BBLDaysProd Wells Producing KUPARUK RIVER, TARN OIL Pool Jan 1996 Dec 2004 Jul 1998 267127 229522 131942 2 Aug 1998 477544 520071 1575132 6 Sep 1998 638274 683070 856209 8 Oct 1998 736382 930683 34244 10 Nov 1998 724613 1030516 1835289 11 Dec 1998 690507 1082565 940296 12 3534447 4476427 6559Year Total Jan 1999 667522 974363 1469278 12 Feb 1999 603132 638740 2518287 15 Mar 1999 738676 738729 3407346 16 Apr 1999 773792 868772 3663339 17 May 1999 934264 1129081 5016477 20 Jun 1999 863132 1049340 1012522 19 Jul 1999 799434 1074437 50796450 18 Aug 1999 878781 1397651 148469554 20 Sep 1999 801475 1464988 192005548 20 Oct 1999 865892 1445286 12221580 20 Nov 1999 801409 1355425 3836525 19 Dec 1999 813066 1258380 3614555 18 9540575 13395192 428026Year Total Jan 2000 814403 1289173 3087579 20 Feb 2000 788657 1262221 4077558 20 Mar 2000 839952 1401479 2839603 20 Apr 2000 775092 1391375 2721595 20 May 2000 785532 1465634 2438620 20 Jun 2000 705859 1475343 2410586 20 Jul 2000 661285 1623497 12670464 21 Aug 2000 652042 1764353 263028551 20 Sep 2000 627882 1448066 332633574 23 Oct 2000 777643 1695531 17193643 25 Nov 2000 676489 1558952 3454657 24 Dec 2000 661711 1400999 1650684 24 8766547 17776623 648200Year Total Jan 2001 577297 1341390 1583629 24 Feb 2001 508756 1242769 2572556 22 Mar 2001 662677 1565493 1905705 24 Apr 2001 657935 1366653 1326676 23 May 2001 648931 1398487 937667 23 Jun 2001 619677 1369155 678610 22 Jul 2001 627361 1399360 10477645 21 Aug 2001 723034 1499019 40087667 24 Sep 2001 639985 1155007 39852645 23 Oct 2001 660500 1034482 31093596 21 Nov 2001 794120 958930 35387663 23 Dec 2001 932150 1207578 54764737 27 8052423 15538323 220661Year Total 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 Producing KUPARUK RIVER, TARN OIL Pool Jan 1996 Dec 2004 Jan 2002 1013510 1190890 22356756 28 Feb 2002 845493 939648 32114643 25 Mar 2002 1019787 1050723 50855734 25 Apr 2002 1048251 1174706 47531711 24 May 2002 1038404 1201080 69073743 25 Jun 2002 1003172 1114259 60306700 24 Jul 2002 922736 998128 78804711 23 Aug 2002 1019053 1097252 91060745 26 Sep 2002 1053631 1226556 105742778 26 Oct 2002 1064530 1100369 109985799 26 Nov 2002 839565 891781 58425649 26 Dec 2002 1143255 1115880 70055778 26 12011387 13101272 796306Year Total Jan 2003 1129653 1097164 72025775 25 Feb 2003 1001557 1086610 74626695 25 Mar 2003 1084483 1130776 114416774 25 Apr 2003 1041831 1100074 125202735 25 May 2003 1046941 1162965 134865742 25 Jun 2003 1046225 1120433 163521716 25 Jul 2003 1096349 1172627 175866775 25 Aug 2003 1046447 965599 164411775 25 Sep 2003 1015592 1046981 159866750 25 Oct 2003 1013934 1121234 196819775 25 Nov 2003 911957 948805 255279750 25 Dec 2003 917437 886909 295862751 25 12352406 12840177 1932758Year Total Jan 2004 954324 1124059 236921744 24 Feb 2004 880005 1033265 211879696 24 Mar 2004 893820 1047864 268971744 24 Apr 2004 834440 1159995 225414705 24 May 2004 897623 1441028 187612743 25 Jun 2004 862299 1203498 227530760 27 Jul 2004 899649 1220638 340512804 27 Aug 2004 866178 1195810 408712806 26 Sep 2004 847873 1218947 328049780 26 Oct 2004 854914 1372708 313484792 26 Nov 2004 797015 1222419 285836750 25 Dec 2004 757326 1038754 363182775 25 10345466 14278985 3398102Year Total 64,603,251 91,406,999 7,430,612Pool 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 KUPARUK RIVER, TARN OIL Pool Nov 1998 0 7840892 Dec 1998 0 1116496108 4 Year Total 0 1194904 Jan 1999 0 1652874124 4 Feb 1999 0 1376122112 4 Mar 1999 0 89345991 6 Apr 1999 0 1620071142 5 May 1999 0 2133240180 6 Jun 1999 0 1748901166 7 Jul 1999 520959 081 3 Aug 1999 650091 0119 5 Sep 1999 562156 153317141 6 Oct 1999 0 2163509173 6 Nov 1999 0 2431204180 6 Dec 1999 0 2329306186 6 Year Total 1733206 16502003 Jan 2000 0 2210758186 6 Feb 2000 0 2224814174 6 Mar 2000 0 2332593186 6 Apr 2000 0 1763997134 6 May 2000 0 86439679 3 Jun 2000 0 66372361 3 Jul 2000 38475 15244949 3 Aug 2000 613614 0133 5 Sep 2000 758100 7154 6 Oct 2000 6 1936133186 7 Nov 2000 0 2177199210 7 Dec 2000 0 2225447217 7 Year Total 1410195 16551516 Jan 2001 0 2095659217 7 Feb 2001 0 2196489196 7 Mar 2001 53 2605062235 8 Apr 2001 0 2569653240 8 May 2001 0 2467274242 8 Jun 2001 0 2040249220 8 Jul 2001 1457358 251653211 9 Aug 2001 2386413 0279 9 Sep 2001 2208442 0278 10 Oct 2001 1728771 38478310 10 Nov 2001 1821199 269225306 11 Dec 2001 1805148 505437351 12 Year Total 11407384 15039179 2/2/2005 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, TARN OIL Pool Jan 2002 1892028 980694394 13 Feb 2002 1916488 1021602379 14 Mar 2002 2275322 1508995434 14 Apr 2002 2033552 1548801445 15 May 2002 1819128 1822799465 15 Jun 2002 1749909 1841831450 15 Jul 2002 1655490 1562826456 15 Aug 2002 1978173 1203583465 15 Sep 2002 1847321 1366759450 15 Oct 2002 1618554 1730182461 15 Nov 2002 1502727 276883310 15 Dec 2002 1181132 1890514465 15 Year Total 21469824 16755469 Jan 2003 1209561 2322598465 15 Feb 2003 1504387 1439963405 15 Mar 2003 1801231 1452659431 14 Apr 2003 1795902 1494390419 14 May 2003 1492171 1334366381 14 Jun 2003 1360731 1316957395 14 Jul 2003 1475677 1567125433 14 Aug 2003 1537454 1693751434 14 Sep 2003 1125344 1408894416 14 Oct 2003 1497346 1210712434 14 Nov 2003 1699766 1366732420 14 Dec 2003 1297721 1822230434 14 Year Total 17797291 18430377 Jan 2004 877445 1772959404 14 Feb 2004 896044 1776875392 14 Mar 2004 927815 1539574403 13 Apr 2004 1180039 1374292388 13 May 2004 1076929 1578131358 13 Jun 2004 1099205 864522365 14 Jul 2004 1565515 756600457 15 Aug 2004 1314536 1246362465 15 Sep 2004 1093218 1643422450 15 Oct 2004 1037312 1699126452 15 Nov 2004 865099 1629691424 15 Dec 2004 1316928 1475353465 15 Year Total 13250085 17356907 Pool Total 67,067,985 101,830,355 2/2/2005 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 Tarn 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 KUPARUK RIVER, TARN OIL Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 430, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co430.htm Alaska Oil and Gas Conservation Commission, 2003, Conservation Order No. 430a, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co430a.htm Alaska Oil and Gas Conservation Commission, 2005, Production Database 2/7/2005 Page 1 of 1 Tarn Oil Pool Summary The Tarn Oil Pool lies within the Kuparuk River Unit ("KRU"), and it is defined as the accumulation of hydrocarbons common to and correlating with the intervals between the measured depths of 4376' and 5990' interval in the Bermuda #1 well (KRU 36 10-7/1).1 Original oil in place (“OOIP”) in the Bermuda and Cairn intervals is estimated to be is about 136 million barrels. Waterflood operations were not undertaken because of potential reservoir damage, unfavorable reservoir permeability and poor water mobility characteristics.2 Regular production began from the pool in July 1998. Development has been from the KRU 2N-Pad, supplemented from the 2L-Pad. Well spacing within the pool is 10 acres. In December 2004, production from the pool averaged 24,430 barrels of oil per day: 21,390 BOPD from 20 wells on 2N-Pad and 3,040 BOPD from 6 wells on 2L-Pad.3 Geology The Tarn oil pool is composed of five intervals of late Cretaceous-aged marine sandstone with interbedded mudstone intervals that lie within the Seabee Formation. These five intervals are informally termed, from deepest to shallowest, Iceberg, Arete, Cairn, Bermuda, and C30. They share a common depositional environment, and have similar lithologic characteristics and fluid compositions. Sand and hydrocarbon distribution within the pool is complex, with variable gross sand percentages within each interval. Not all of the potential reservoir intervals in the pool have been shown to be hydrocarbon bearing, and the primary reservoir intervals are the Bermuda and Cairn. Hydrocarbon distribution is controlled by sand distribution, with updip stratigraphic seal along the western margin of the pool area. The pool is composed of heterogeneous sandstone with shale laminations and interbeds. Sandstone is fine to very fine- grained, framework grains are principally quartz, plagioclase, zeolites, and heterolithic rock fragments. Clay content is high, ranging between 15 and 25%, and occurs primarily in the heterolithic framework of the sandstone. Porosity ranges from 18 to 27%, averages 21%, and is dominantly secondary with common microporosity. Air permeability ranges from 1 to 45 md and averages 10 md. Because of the fine-grain size and high clay content, the reservoir is susceptible to fines migration. The Tarn oil pool structure appears to be a monocline, with easterly dip ranging up to four degrees. Few faults have been found.4 SFD Revised Feb. 7, 2005 1 Alaska Oil and Gas Conservation Commission, 2003, Conservation Order No. 430a, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co430a.htm 2 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 430, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co430.htm 3 Alaska Oil and Gas Conservation Commission, 2005, Production Database 4 Alaska Oil and Gas Conservation Commission, 1998, Conservation Order No. 430, available online at: http://www.state.ak.us/local/akpages/ADMIN/ogc/orders/co/co400_449/co430.htm AAOrder No.DateOperator Description Current KUPARUK RIVER FIELD TARN 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 430 0ACO 27-Aug-03CONOCOPHILLI Authorization to changes to Rule 7 Conservation Order 430 pertaining to Common Production Facilities and Surface Commingling allocation methods affecting the Tarn Oil Pool producing with the Kuparuk River Unit. Y 430 2CO 05-Jul-00CONOCOPHILLI Approval of waterflood project in the Tarn Oil Pool Y 430 1CO 08-Jul-99ARCO ALASKA Approval of pilot waterflood project in the Tarn Oil Pool, Kuparuk River Unit, North Slope, Alaska. Y 16 0AIO 20-Jul-98ARCO ALASKA Authorizes underground injection for purposes of waste disposal & enhanced oil recovery in the Tarn Oil Pool. Y AAOrder No.DateOperator Description Current KUPARUK RIVER FIELD TARN OIL POOL Obsolete Orders 430 0CO 21-Jul-98ARCO ALASKA Defines and establishes rules for development of the Tarn oil pool in the Kuparuk River Field. Amended by CO 494/Superseded by CO 430A. N Tarn 0816243240Producing Oil WellsKUPARUK RIVER FIELD, TARN OIL POOL020406080100Water Cut ( % )KUPARUK RIVER FIELD, TARN OIL POOL0.10.51510501005001000Cum Oil Prod ( MMbbl )Cum Water Prod ( MMbbl )Cum Gas Prod ( MMMcf )KUPARUK RIVER FIELD, TARN OIL POOL1998992000010203040.010.050.10.51510501005001000Oil Rate (CD) ( Mbbl/d )Water Rate (CD) ( Mbbl/d )Gas Rate (CD) ( MMcf/d )Gas / Oil Ratio ( Mcf/bbl )KUPARUK RIVER FIELD, TARN OIL POOL 051015Wells on Gas InjectionWells on Water InjectionKUPARUK RIVER FIELD, TARN OIL POOL - EOR INJECTION0.10.51510501005001000Cum Gas Inj ( MMMcf )Cum Water Inj ( MMbbl )KUPARUK RIVER FIELD, TARN OIL POOL - EOR INJECTION1998992000010203040.10.5151050100Gas Inj Rate (CD) ( MMcf/d )Water Inj Rate (CD) ( Mbbl/d )KUPARUK RIVER FIELD, TARN 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