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Offshore Installation Services (OIS), an Acteon company, has been awarded a contract to decommission multiple wells in the North Sea by Centrica Energy.

The initial campaign includes six subsea wells in the central North Sea, in categories 2.1 and 2.2, which will be abandoned using a diverless, vessel-based approach.

Planning and engineering are underway, and the offshore scope of the Centrica contract will mobilise in summer 2015, the company informed.

The campaign will be conducted from an anchor-handling tug supply vessel (AHTS), the Island Valiant. During phase one, the Suspended Well Abandonment Tool (SWAT) system from Claxton Engineering Services will be deployed through the vessel’s moon pool to set cement plugs in the bore and across all the casing annuli.

The second phase will use an abrasive severance system for the cutting of the wells and sequential removal from the seabed. This will conclude the offshore operations.

Colin Shellard, OIS Vice President Operations, said, “We are supporting the Centrica Energy team with its future multi-well decommissioning programme. 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.”