[ThirdMate]

Thanks for the good info. Do you have any idea how the BOP would fail?

Was it overcome by extraordinary gas pressure? Or a defect in the BOP?

Frgds,
3/M

[TWfromTEXAS]

I suspect the BOP did not fail, the deepwater ones are massive and can close by cutting casing or around drill pipe.

Pure guess, it sounds like they were running a packer to test it so one of several things could happen. The packer could have been in the BOP and prevented it from closing. The packer run can displace mud and the crew was lax in keeping the hole filled. They could have been in a gas pocket where a build up happened at the same time the mud volume was down.

[Jewbacca]

“Do you have any idea how the BOP would fail?”

My guess is someone tried to save $20 and put a $98 rubber o-ring inside, instead of the square wire-filled gasket.

Pressures up fine -— in the shop.

Cycles of pressure when underbalanced?! Watch out.