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BP Plc s internal investigation of the Deepwater Horizon rig disaster found company engineers misinterpreted pressure data that indicated a blowout was imminent, according to a person familiar with the report.
BP managers aboard the Transocean Ltd .-owned rig misread a test of the Macondo wells stability on April 20 and began replacing drilling fluid, which is heavier than oil and natural gas, with seawater, said the person, who spoke on condition of anonymity because the reports findings havent been publicly released.
The seawater was too light to prevent natural gas that had begun leaking into the well from shooting up the pipe to the rig, where it exploded and killed 11 workers. The damaged well eventually spewed more than 4 million barrels of crude into the sea, enough to fill two supertankers.
BP intends to announce the findings of their internal probe in the next 10 days, the person said. Scott Dean , a U.S.-based spokesman for BP, didnt return messages left after regular business hours on his office and cellular phones.
The 200-page report was compiled by a team of BP investigators led by Mark Bly, the London-based companys head of safety and operations. The report concluded BP bears at least partial responsibility for the incident that led to the largest oil spill in U.S. history, the person said. Blys team also found that Transocean shares the blame, the person said.
Blys team began conducting interviews and reviewing internal documents just days after the Macondo well erupted about 40 miles (64 kilometers) off the Louisiana coast in the Gulf of Mexico.
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