Offshore Installation Services (OIS), an Acteon company, has been awarded a contract by Antrim Energy to decommission four subsea wells in the central North Sea, according to a news release.

The offshore scope of the campaign, which also includes six wells from Centrica Energy, will include complete offshore and onshore project management, vessel charter, equipment and personnel.

The wells, in categories 2.1 and 1, will be abandoned using Acteon sister company, Claxton’s, suspended well abandonment tool (SWAT), OIS said in the release. SWAT is a diverless, vessel-based approach and will be completed as part of a multi-operator campaign in summer 2015.

The offshore campaign will be conducted from an anchor-handling tug supply vessel (AHTS), the Island Valiant, according to the release. During phase one, SWAT 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.

Offshore