StatoilHydro lets contract for Troll B gas injection

Uchenna Izundu
International Editor

LONDON, Aug. 19 -- StatoilHydro has let a $100 million contract to Subsea 7 to design and install Troll B gas injection facilities to improve oil recovery at the country's largest gas field in the Norwegian North Sea. Precommissioning will take place in 2010.

Troll field lies on the Norwegian Continental Shelf about 70 km northwest of Bergen in 300-340 m of water. The development is part of StatoilHydro's 10 billion-kroner plan to manage the resources and boost recovery of reserves at Troll by 17 million bbl. The company submitted its plan to the energy ministry in June.

A single gas injection pipeline and a control umbilical will connect two separate subsea satellite wells to the Troll B platform—a floating process and accommodation platform with a concrete hull. One well will be 3.5 km and another 6.5 km south of the platform.

Subsea 7 will engineer, procure, fabricate, and install a 6.5-km, 12-in. rigid pipeline, incorporating inline and end structures for connection to the satellite wells, in addition to the control umbilicals. It will use one of its new vessels to install two 200-tonne satellite structures.

The company's office in Stavanger will begin implementing the contract immediately. Pipeline fabrication will be carried out in early 2009 at Subsea 7's new North Sea Spoolbase at Vigra on Norway's northwest coast. Pipelaying operations are scheduled for 2009 with one of its specialized reeled pipelay vessels.

The contract is a call-off of an option under an existing Subsea 7 Troll contract with StatoilHydro, Subsea 7 said.

Contact Uchenna Izundu at uchennai@pennwell.com.

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