Transocean Winner

Petroleum Safety Authority (PSA) Norway has granted consent to Det norske oljeselskap to use the Transocean Winner mobile drilling facility for production drilling and completion on the Volund field in the central North Sea.

The semi-submersible Transocean Winner facility is of the GVA 4000 type and was built at Gøtaverken Arendal in Gothenburg in 1983.

The vessel underwent an upgrade in 2006 and is owned and operated by Transocean.

In August 2006, Transocean Winner was issued with an acknowledgement of compliance (AoC) by the PSA.

Located in Block 24/9 of the central North Sea around 10km south of the Alvheim field, Volund oil field has been developed using a subsea facility that is connected to the Alvheim FPSO production vessel with three horizontal wells.

"We are still exploring the new areas where zinc could add value to consumers and also add in the GDP of the country."

The water depth ranges around 120m-130m.

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Initial production from Volund began in September 2009, and regular production started in April 2010.

The field is covered by production licence PL150. Marathon Oil’s wholly owned subsidiary Marathon Petroleum Norge owns a 65% working interest in the project and also operates it.

Sweden-based Lundin Petroleum owns the remaining 35% stake.

In January 2007, the Norwegian Ministry of Petroleum and Energy ratified the plan for development and operation (PDO) of the field, which included the drilling of three production wells and a water injection well.

Image: The semi-submersible Transocean Winner facility is owned and operated by Transocean. Photo: courtesy of Petroleum Safety Authority.