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 Troll oil field

Troll is a natural gas and oil field in the Norwegian sector of the North Sea, one of the biggest in the North Sea, holding 40% of Norway´s gas - 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 65 kilometres west of Kollsnes.

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 platform was built by Norwegian Contractors (NC), a company that later became part of the Aker ASA.

Kværner and its Concrete solutions now continue the NC heritage by designing and constructing concrete platforms for the future.

The Troll A platform, based on the Condeep technology, is the tallest structure ever to be moved. Total weight is 656,000 tons, the total height is 472 metres. The depth is 303 metres. This platform came into production in 1996.

The Troll B Platform is a semi-submersible 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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