Department of Administration

Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
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AOGCC Pool Statistics
Kuparuk River Unit, Kuparuk River Oil Pool
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Operator: ConocoPhillips Alaska, Inc.
Index map for the Colville River  Unit, Nanuq Oil Pool showing it’s general location with respect to other North Slope oil fields.
Discovery Well: Sinclair Oil Corp
  Sinclair BP-Ugnu No. 1
  Permit #168-111
  API No. 50-029-20009-00-00
  Sec. 22, T12N, R09E, UM

Depth: 9,428’ MD / 9,428' TVD

April 7, 1969

Status: Producing
Location: Central Arctic Slope Area Location Map Unit Location Map DNR Unit Map
Orders: List of Orders Summary - Annotated References  
Summary:

The Kuparuk River Oil Pool is the second largest on the Arctic Slope of Alaska, occupying approximately 500 square miles. It was discovered in 1969 by the Sinclair Ugnu No. 1 well, and is defined as the accumulation of oil that is common to, and correlates with, the accumulation found in the ARCO West Sak River State No. 1 well between the measured depths of 6,474 and 6,880 feet. The pool lies from approximately 5,600’ to 6,500' true vertical depth below sea level. Step-out exploratory drilling of the Palm #1 and #1A wells in during 2001 discovered an extension of the pool to the west of the main pool.

 

Regular production from the pool began in December of 1981, and water flood operations were initiated in February 1982. Production from the pool peaked in December 1992 at an average of 339,386 barrels of oil per day (“BOPD”). During the last six months of 2010, the pool averaged 92,480 BOPD from 435 production wells. Kuparuk oil has an API gravity of 23 degrees to 28 degrees. Reports of reservoir temperature range from 155º F to 200º F.



Geology:

The Kuparuk River Formation is a sequence of clastic sediments deposited on a shallow marine shelf during Neocomian (Early Cretaceous) time. The formation is divided into Upper and Lower Members. These two Members are comprised of four informal units that are termed, in ascending order, "A", "B", "C", and "D". The "A" and "C" units are the pay-bearing intervals. The A unit exists throughout the pool area, and it consists of sandstone, siltstone and mudstone in a series of regressive cycles that range to 70’ thick. When mapped in detail, these individual cycles form elongate bodies that strike northeast-southwest. Porosity averages 23% and permeability averages about 80 md. The A unit thins to the west where it is truncated by an intraformational unconformity that lies at the base of the C unit. The C Unit is composed of glauconitic sandstone and siltstone with subordinate conglomerate and lesser shale. Bands of siderite-cemented sandstone are common. Porosity and permeability average 21% and 90 md, respectively. Throughout the Kuparuk River Unit, C-unit sand deposition appears to have been influenced by syndepositional, northwest-trending normal faults.

 

Structure Map Strat Column Type Log
Orig. Oil in Place:  
Production: Prod Chart NGL Chart  
  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 2,255,689,360 3,345,638 3,008,612,264 3,755,758,737
2005 Total
50,442,067 0 97,291,936 216,366,299
2006 Total
45,970,995 0 90,839,160 193,832,439
2007 Total
43,043,924 0 94,989,956 185,807,881
2008 Total
39,263,839 0 92,527,109 172,226,404
2009 Total
38,012,938 0 85,279,055 168,763,691
2010 Total
34,953,313 0 83,783,426 174,572,731
2011 Total
33,357,854 0 74,305,850 175,429,800
2007 Rate (b/d)
117,929 0 260,246 509,063
2008 Rate (b/d)
107,572 0 253,499 471,853
2009 Rate (b/d)
104,145 0 233,641 462,366
2010 Rate (b/d)
95,763 0 229,544 478,281
2011 Rate (b/d) 91,391 0 203,578 480,630
2008 Change (%)
-9 0 -3 -7
2009 Change (%)
-3 0 -8 -2
2010 Change (%)
-8 0 -2 3
2011 Change (%)
-5 0 -11 0

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