Troll gas field
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Troll is a natural gas and oil field in the Norwegian sector of the North Sea, 100 km North-West of Bergen, 50 km 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 65km west of Kollsnes, near Bergen, in water depths of 315-345m. Most of the gas lies in Troll East.[1]
The field is operated by StatoilHydro, which has a 30.58% interest. The other partners are the Norwegian Government’s Petoro (56%), Shell (8.1%) ConocoPhillips (1.62%) and Total (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 472 meters. The depth is 303 meters.[2] 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.
[edit] References
- ^ Offshore Technology Website http://www.offshore-technology.com/projects/troll/
- ^ Troll A Platform in the Structurae database
[edit] External links
Coordinates: 60°38′44″N 3°43′35″E / 60.64556°N 3.72639°E
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