A complete severance and recovery solution for 28 wells using SABRE™
250Te capacity proving string
Once offshore, the team followed the process of severing the wells internally from within either the 9-5/8″ or 7-5/8″ casing, out though the inner 13-3/8″ and 20″ casing and 30″ conductor. This was followed by proving the cuts using our bespoke verification system. During this process, Claxton implemented an innovative proving string including a baffle for well returns and a strengthening system for the starter head connection, the strength integrity of which was in question.
The wells with uncemented casings presented no issues to SABRE™ and were all within the cut tolerance range. Some of the wells were trickier to sever due to eccentricity issues so downhole tooling and procedures were adapted to accommodate.
During the recovery operation, the casings were drilled and pinned and recovered as a single multi-string recovery. The team even designed a compact marine growth removal tool especially for this recovery process, to operate within the confined space at the production deck.
The campaign is ongoing, and at the time of writing, Claxton have successfully cut and recovered eight wells. The team are making good progress on the remaining wells, with efficiencies constantly
“Claxton worked closely with the operator to jointly plan the project carefully before the offshore phase. We went on to mobilise multi-skilled decommissioning technicians and maintenance personnel who ensured round the clock operations”, said Claxton Project Engineer Scott Eke.
Throughout the project, Claxton have continued to investigate and implement safe ways to speed up processes when met with challenging well conditions. At the time of writing, the cut speed for one well was reduced by a third.
Claxton’s partnership with the client has gone from strength to strength, with the client stating; “The Claxton team were innovative from the project outset, designing and developing bespoke equipment within tight deadlines. The offshore team came up against several challenges, including a tricky multi-string recovery, where they remained professional and worked hard to resolve the problem, achieving a clean and successful recovery.”
The operator’s decommissioning campaigns in the North Sea are ongoing and Claxton hope to continue to support them by using our marine package on their other assets.
DOES YOUR CHALLENGE NEED A BESPOKE SOLUTION?
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