Three of four tests showed that the cement mixture used by Halliburton in the construction of BP’s ill-fated oil well in the Gulf was unstable, but the mixture was used anyway, a presidential commission investigating the disaster has found. The only successful test, which BP did not know about, has since come under suspicion.

AP via Google:

The panel said that of four tests done in February and April by Halliburton, only one — the last — showed the mix would hold. But the results of that single successful test were not shared with BP, and may not have reached Halliburton, before the cement was pumped, according to a letter sent to commissioners Thursday by chief investigative counsel Fred H. Bartlit Jr.

BP had in hand at the time of the blowout the results of only one of the tests — a February analysis sent to BP by Halliburton in a March 8 e-mail that indicated the cement could fail. The slurry tested in that case was a slightly different blend, and assumed a slightly different well design, but there is no indication that Halliburton flagged the problem for BP, or that BP had concerns, the letter said.

[…] Independent tests conducted for the commission by Chevron on a nearly identical mixture were also released Thursday. The results concluded that the cement mix was unstable, raising questions about the validity of Halliburton’s final test.

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