Troll gas field

Troll Gas Field

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Troll gas field

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Troll is a natural gas and oil field in the Norwegian sector of the North Sea, North-West of Bergen, west of the island of Fedje.

Although Troll is primarily a gas field – one of the biggest in the North Sea, holding 60% of Norway’s gas reserves – it also possesses significant quantities of oil, in thin zones under the gas cap, to the west of the field. The field as a whole consists of the main Troll East and Troll West structures in blocks 31/2, 31/3, 31/5 and 31/6, about west of Kollsnes, near Bergen, in water depths of . Most of the gas lies in Troll East.

The field is operated by Statoil, which has a 30.58% interest. The other partners are Petoro (56%), Royal Dutch Shell (8.1%), ConocoPhillips (1.62%) and Total S.A. (3.69%).

Gas and oil from the field is extracted via three platforms – Troll A, B and C.

The Troll A platform, based on the Condeep technology, is the largest structure ever to be moved. Total weight is 656,000 tons, the total height is . The depth is . This platform came into production in 1996.

The Troll B Platform is a semi-submersible designed by Doris and fabricated from concrete; thought to be the only concrete semisubmersible. This platform came into production in 1995.

The Troll C Platform is a conventional steel hull semi-submersible designed by GVA Consultants. This platform came into production in 1999.



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