Statoil ASA has submitted a plan for development and operation of the Trestakk discovery on the Halten Bank to the minister for petroleum and energy in Bodo, Norway. Capital expenditures are estimated at 5.5 billion kroner.
Discovered in 1986 by the 6406/3-2 well, Trestakk lies in 300 m of water in the Norwegian Sea just south of Asgard. The discovery was further delineated by well 6406/3-4 and identified oil in Middle Jurassic sandstones in the Garn formation. The top of the reservoir lies at a depth of 3,885 m, and it was deposited in a shallow marine environment with calcite cemented intervals.
Trestakk contains 78 million boe, which is mainly oil. The project will be tied back to the Asgard A oil production vessel, with planned production startup anticipated in 2019.
“Trestakk is a good example of what is possible to achieve through spending time on working toward the best concept selection,” said Torger Rod, head of Statoil project development. The operator’s first investment estimates were 10 billion kroner, which was reduced to 7 billion kroner when the concept selection was made in January (OGJ Online, Feb. 15, 2016).
The concept selection consists of a template structure and an attached satellite well, which will be tied back to Asgard A. Three production wells and two gas injection wells will be drilled for a total of five wells. Statoil attributed the 50% reduction in cost to “rethinking” the original design, and the increase in recoverable oil will extend the life of Asgard A toward 2030, the company said.
Statoil holds 59.1% interest in Trestakk as operator with ExxonMobil Exploration & Production Norway AS 33% and Eni SPA 7.9%.
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