4.9 million barrels of oil - largest-ever spill - released into Gulf waters during the 87 days of BP's leaking well (8/4)
Overall, the scientific teams estimate that approximately 4.9 million barrels of oil have been released from the well, making it the largest accidental spill of all time. Not all of this oil and gas flowed into the ocean; containment activities conducted by BP under U.S. direction captured approximately 800,000 barrels of oil prior to the capping of the well.
The scientific teams estimate that 53,000 barrels of oil per day were leaking from BP’s well immediately preceding its closure via the capping stack.
Recent measurements and modeling also show that, as a result of depletion of the hydrocarbon reservoir, the daily flow rate decreased over the 87 days prior to the well’s closure. Based on these measurements and modeling, the scientific teams estimate that, at the beginning of the spill, 62,000 barrels of oil per day were leaking from the well.