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Eni gets Schrader Bluff pool rules
The Alaska Oil and Gas Conservation Commission has issued pool rules for the Schrader Bluff oil pool at Nikaitchuq.
While initial wells are being drilled from a drilling pad at Oliktok Point, the entire Nikaitchuq unit is offshore in East Harrison Bay, approximately centered around Spy Island.
The commission said the Nikaitchuq Schrader Bluff oil pool is the accumulation of hydrocarbons correlating to the interval between the measured depths of 3,530 and 3,867 feet in the Kigun No. 1 well southwest of Spy Island.
The Nikaitchuq Schrader Bluff includes two sands, OA (3,780 to 3,822 feet in the Kigun well) and N (3,627 to 3,663 feet); only the deeper OA sand will be developed initially.
“Four distinct lobe deposits are currently interpreted by the operator, and these lobes are separated by layers of siltstone, calcite-cemented siltstone, or mudstone. The OA and N sands appear to persist through the Nikaitchuq Unit,” the commission said in its Nov. 19 order.
Gross thickness for the OA sand ranges from 30 to 40 true vertical feet.
OA sand API gravity for the OA sand varied from 16 degrees API to 19 degrees in samples from four wells.
Original oil in place for the OA sand is estimated at 800 million to 930 million barrels, with 4-5 percent (30-45 million barrels) estimated recoverable through primary recovery, and 120 million to 200 million barrels estimated recoverable through primary and waterflood, a total of 15 to 22 percent of original oil in place.
The commission said production over a projected life of 30 years is expected to average some 7,000 barrels per day, with a peak production rate of about 28,000 bpd and 2.2 million cubic feet of gas per day early in the project life.
The N sand reservoir is estimated to contain between 300 million and 600 million barrels and “may be developed later depending upon drilling results,” the commission said.
Twenty-six production wells are planned, with the horizontal sections of the wells ranging from 4,000 to 8,500 feet within the reservoir. Producers will alternate with injectors “in a line-drive flood pattern flanked by outboard production wells.”
—Kristen Nelson
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