Corrective Plan Underway for DS-1 Following Riser Pipe Buckle

Rig contractor Ensco Plc is completing a corrective action plan for the DS-1 (UDW drillship) after a riser pipe buckled on board the rig, and the company expects to be back to work soon following the incident, a company spokesperson told Rigzone.

No workers were injured in the incident, which occurred several days ago, the spokesperson told Rigzone in an email statement.

Marine website gCaptain reported Wednesday that workers on board the drillship forgot to open the blind shear rams while running the rig’s blowout preventer (BOP) to the wellhead. The hook load began to increase unexpectedly after the BOP was lowered 3,970 feet down, according to the website. The riser reportedly was not able to fill with water with the blind shear rams closed, and the pipe collapsed onto itself as the hydrostatic differential continued to build.

DS-1 was working for Total S.A. offshore Angola at the time of the incident. According to Rigzone’s RigLogix database, the rig had started drilling in mid-July at the Cravo 355 location in 4,570 feet of water. The rig is under contract at a day rate in the mid-$350,000s.


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