"Halliburton (and perhaps BP) should have considered redesigning the foam slurry before pumping it at the Macondo well," the letter said.

“哈里·伯顿(可能BP也)应该在将泡沫泥浆注入马孔多钻井之前考虑重新设计它，”信中说。

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"Halliburton (and perhaps BP) should have considered redesigning the foam slurry before pumping it at the Macondo well, " the letter continued.

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"We have known for some time that the cement used to secure the production casing and isolate the hydrocarbon zone at the bottom of the Macondo well must have failed in some manner, " the letter said, noting that BP used a "nitrogen foam cement" recommended and supplied by Halliburton.

CNN: STORY HIGHLIGHTS