UK supermajor BP had to re-spud an exploration well in the deep-water Gulf of Mexico after the wellhead on the first attempt slipped below the mud line.
The company was drilling a prospect called Bright in Atwater Valley Block 362 in about 5600 feet of water when the incident occurred early in the drilling process.
“The loss of the wellhead below the mud line... occurred during a preliminary stage of drilling, thousands of feet from any hydrocarbon zone, and did not pose any risk to well integrity or the safety of the team working there,” BP said in a statement to Upstream.
“The federal government was advised and has approved of the actions we have taken to address the issue,” the company added.
BP had set 310 feet of 36-inch conductor casing and was running a 28-inch diameter casing string prior to the loss of the wellhead, sources told Upstream.
The company opted to abandon the effort and filed a second permit to drill on the same block. The second well was spud in late May, about two weeks after the first well had started drilling, sources said.
BP is using drillship Ensco DS-4 for the Bright prospect. Both wells were permitted to a depth of about 15,450 feet.