Prosafe and Statoil (UK) have agreed to rephase the Mariner project in the UK Continental Shelf of the North Sea from 2016 into 2017.

The companies will also extend the firm hire duration from the agreed eight to 13 months.

Operations are set to begin within the third quarter of 2017 at the Statoil Mariner platform and will be performed by Prosafe’s Safe Zephyrus or Safe Boreas accommodation support vessels.

Prosafe has also granted six additional one-month options to Statoil that are linked to the Mariner project.

The total value of the rephased and extended duration for the project has increased from $76.3m to $131.8m.

As part of the Mariner project, Mariner field in Block 9/11a and Mariner East ultra-heavy oil field in block 9/11b, will be developed with an estimated investment of $7bn.

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"The total value of the rephased and extended duration for the project has increased from $76.3m to $131.8m."

The project lies at water depths that range between 97m and 112m, and is located 130km off the nearest British coast and 40km north-west from the UK / Norway international boundary.

Statoil will operate the Mariner area development with working interests of 65.11% in Block 9/11a and 92% in Block 9/11b.

Eni Ulx owns the remaining 8% equity in Block 9/11b.

JX Nippon Exploration and Production (UK) owns 28.89% in Block 9/11a and Cairn Energy owns 6%.

Statoil (UK) awarded a $76.3m contract to Prosafe in June 2013 to provide either the Safe Zephyrus or Safe Boreas vessel at the project.

The vessels provide Statoil with the flexibility of both DP3 and 12-point moored station.

Image: Prosafe’s Safe Boreas accommodation support vessel. Photo: © Prosafe.