Fluids coming up through the well should have been diverted overboard to relieve pressure while the crew addressed the problems. Over a critical 40-minute period, the rig crew failed to realize that oil and gas were coming up the well. The Transocean rig crew and BP well site leaders wrongly concluded that a an integrity test of the well was successful. Problems with a device called the shoe track at the bottom of the well allowed oil and gas to enter. There were weaknesses in cement design and testing, quality assurance and risk assessment for the Deepwater Horizon's well. And a key piece of evidence - the failed blowout preventer - was only raised to the surface on Saturday and has yet to be closely examined. government, including the Justice Department, Coast Guard and Bureau of Ocean Energy Management, Regulation and Enforcement, are also investigating. The accident killed 11 workers aboard the Deepwater Horizon rig and spewed more than 200 million gallons of oil from the undersea well over the next three months.īP's findings aren't the final word on what went wrong, as several divisions of the U.S. Multiple parties, including BP, Halliburton and Transocean, were involved," outgoing CEO Tony Hayward said in the report. "It is evident that a series of complex events, rather than a single mistake or failure, led to the tragedy. In the 193-page internal report posted Wednesday on BP's website, the British oil giant says the April disaster was caused by "a sequence of failures involving a number of different parties."
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