Halliburton defended its cementing job on BP's Deepwater Horizon well in the Gulf of Mexico and blamed the U.K. oil major for the spill. The oilfield services company challenged tests that indicated its cement was unstable, claiming that different formulas were used in testing from what was eventually used on the well. Halliburton said it tested a cement sample before pumping started on April 19, and that the result was positive.

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