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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, Meltwater Oil Pool
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Operator: ConocoPhillips Alaska, Inc.
Index Map
Discovery Well: ARCO Alaska Inc.
  Meltwater North No. 1
  Permit No. 200-012
  API No. 50-103-20326-00-00
  Sec. 20, T08N, R07E, UM

Depth: 6,122’ MD / 6,121' TVD

April 26, 2000

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

The Meltwater Oil Pool is located within the current boundaries of the Kuparuk River Unit (“KRU”). This is one of the satellite pools that have been discovered and developed utilizing the infrastructure built to develop the Kuparuk River Oil Pool within the KRU. The pool occurs in the Bermuda Interval (“Bermuda”) of the late Cretaceous-aged (Cenomanian-Turonian) Seabee Formation. It was discovered in 2000 by the Meltwater North 1 exploratory well, and delineated by Meltwater 2 and 2A. This pool is defined as the accumulation of hydrocarbons common to, and correlating with, the interval between the 6,785 and 6,974 feet measured depth (about 4,700’ and 5,500’ true vertical depth subsea ) in the Meltwater North #2A well. Meltwater development has been from the KRU 2P-Pad, using 10-acre well spacing.

The first phase of project development began in January 2001 with pad and facility construction followed by drilling operations, which started in April 2001. Eleven wells were drilled (nine producers and two injectors), and regular production began in November 2001. In May 2002, production peaked at an average of 10,863 barrels of oil per day (“BOPD”), and then began to decline rapidly. Phase II development activities were conducted from October 2003 through May 2004. Four producers and four injectors were added, and one well was converted from production to injection. Production reached a second peak of 8,588 BOPD In October 2004, then declined again. During the first six months of 2011, the Meltwater Oil Pool averaged about 2,250 BOPD, 9.5 million cubic feet of gas per day and 920 barrels of water per day.

Geology:

Meltwater is the stratigraphic equivalent to the Tarn oil pool to the north, and both share similar lithology. The Bermuda consists of channel fill and lobate sandstones deposed in a turbidite fan system located on a slope-apron environment below an incised, Cenomanian-age shelf. Reservoir sandstones at Meltwater are fine to very fine-grained, lithic-rich, have common mudstone laminations and interbeds, and average about 20% porosity and 12 millidarcies air permeability. Clay content of the sandstone ranges from 15 to 25%, but the clay minerals occur dominantly as framework grains rather than as matrix.

The top of the Bermuda reservoir interval dips approximately 2 to 3 degrees to the east-southeast, and complex faulting occurs along the western (up-dip) margin of the pool. Hydrocarbon distribution is controlled by the distribution of reservoir sands. Bermuda reservoirs are compartmentalized due to discontinuous sandstone distribution. Shale-filled channel complexes, stratigraphic pinch-outs and structural barriers all act as lateral boundaries within the pool. Bermuda crude oil gravity is 37° API. No gas cap or oil-water contacts have been encountered within the pool. The reservoir temperature is about 135° F at a datum level of -5,400’ true vertical depth subsea.

  Strat Column Type Log
Production: Prod Chart          
  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 16,073,394 0 39,157,760 3,233,826
2005 Total
2,103,257 0 5,367,712 250,218
2006 Total
1,405,549 0 4,300,244 269,192
2007 Total
1,090,699 0 2,500,348 209,063
2008 Total
856,539 0 1,375,032 116,202
2009 Total
991,472 0 1,283,045 980,798
2010 Total
1,006,660 0 3,558,162 900,346
2011 Total
974,843 0 3,603,469 214,855
2007 Rate (b/d)
2,988 0 6,850 575
2008 Rate (b/d)
2,347 0 3,767 318
2009 Rate (b/d)
2,716 0 3,515 2,687
2010 Rate (b/d)
2,758 0 9,748 2,467
2011 Rate (b/d) 2,671 0 9,873 589
2008 Change (%)
-21 0 -45 -44
2009 Change (%)
16 0 -7 744
2010 Change (%)
2 0 177 -8
2011 Change (%)
-3 0 1 -76

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