Under the contract, OIS will initially decommission six subsea wells, in categories 2.1 and 2.2, using diverless, vessel-based approach.

OIS operations vice-president Colin Shellard said: "We are supporting the Centrica Energy team with its future multi-well decommissioning program.

"OIS is a leader in formulating well abandonment campaigns that provide operators with the most cost-efficient way to decommission suspended, non-revenue generating assets and comply with UK oil and gas legislation."

The company is currently working planning and engineering phases of the decommissioning program, and plans to commence offshore work later this year using the Island Valiant anchor-handing tug supply vessel (AHTS).

As part of the phase one, OIS will use the vessel’s moon pool to install Claxton Engineering Services’ suspended well abandonment tool (SWAT) system, to set cement plugs in the bore and across all the casing annuli.

The wells will be then cut using an abrasive severance system, and removed from the seabed.

OIS has so far completed more than 118 well decommissioning projects. It also handles turnkey projects, including offshore and onshore project management, vessel charter, equipment and personnel.