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SWAT™ delivers unique decommissioning solution


On arrival to the first well it was noted by the team that it had an unreported connector, which meant the TACRT reaction can was not quite big enough to swallow the connector. The Claxton design team rapidly designed and manufactured a new reaction can in three days from their headquarters in Great Yarmouth. This did not cause any lost time as the vessel moved on to another well whilst the can was being fabricated and mobilised back to the rig. After the successful removal of the caps a low-pressure packer tool was used to recover muds, clean the well and cement.

Neil Watson, continues, “As well as the TACRT reaction can modifications that the Claxton team developed, a number of new innovations were tried and tested during this campaign. The SWAT™ Subsea vent valves for example were previously actuated by a remotely operated vehicle (ROV) and were updated to allow hydraulically actuation from surface, to minimize damage and save time. The low-pressure packer tool (LPPT) was used to cement mudline wells and had improved pressure ratings and efficiency, with the upper packer increased from 400psi to 1200psi up to 30” conductor and the lower packer increased from 1200psi to 5000psi with a range of 7” – 16”.”

The result

Vessel based projects allow flexibility in approach to deliver a work scope of this nature and when issues are encountered such as the unreported connector, it is possible to rapidly move location and continue work on an alternative well, whilst an engineering solution is being turned around.

The ‘MV Island Valiant’ vessel was able to transit from the Southern North Sea to the Eastern Irish Sea and become operational on the well within three days.

The combined onshore and offshore experience of Claxton and InterMoor to deliver a unique well abandonment capability, enabled the successful plug and abandoned of the four wells in the specified time for this campaign.

Alan Duncan, Managing Director, InterMoor, said, “I was fortunate to be on the ‘MV Island Valiant’ vessel when we mobilised from Aberdeen and further into the campaign when we met the vessel again at Barrow. It was evident that the collaboration between InterMoor and our sister company Claxton made the project a real success. The feedback from my team was that Claxton’s technical expertise, knowledge and work ethic was superb and we look forward to working with them again soon”.

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