Offshore Installation Services has been awarded a contract to decommission multiple wells in the North Sea by Centrica Energy.
The first decommissioning campaign consists of 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.
OIS performs turnkey projects, which include complete offshore and onshore project management, vessel charter, equipment and personnel.
Planning and engineering are underway, and the offshore scope of the Centrica contract will mobilise in summer 2015. Because of the high degree of flexibility permitted with the rigless operations, OIS continues to engage with other North Sea operators interested in joining the campaign.
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 sister Acteon company 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.
Adapted from press release by Joseph Green