Report Points To Shoddy Work By Halliburton As A Cause Of Deepwater Horizon Blowout
WASHINGTON - Tests performed before the deadly blowout of BP's oil well in the Gulf of Mexico should have raised doubts about the cement used to seal the well, but the company and its cementing contractor used it anyway, investigators with the president's oil spill commission said Thursday.
It's the first finding from the commission looking into the causes of the April 20 explosion that killed 11 workers and led to the largest offshore oil spill in U.S. history. And it appears to conflict with statements made by Halliburton Co., which has said tests showed the cement mix was stable.
The cement mix's failure to prevent oil and gas from entering the well has been identified by BP and others as one of the causes of the accident.
BP and Halliburton decided to use a foam slurry created by injecting nitrogen into cement to secure the bottom of the well, a decision outside experts have criticized.
The panel says that of four tests conducted 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 Bartlit.
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 on March 8 that indicated the cement could fail.
"Halliburton (and perhaps BP) should have considered redesigning the foam slurry before pumping it at the Macondo well," Bartlit writes.
Independent tests conducted for the commission by Chevron on a nearly identical mixture were also released Thursday. The results conclude the cement mix was unstable, raising questions about the validity of Halliburton's final test.
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