In the hours before the Deepwater Horizon drilling rig exploded, BP pumped into the well an extraordinarily large quantity of an unusual chemical mixture, a contractor on the rig testified Monday.
The injection of the dense, gray fluid was meant to flush drilling mud from the hole, according to the testimony before a government panel investigating the April 20 accident. But the more than 400 barrels used were roughly double the usual quantity, said Leo Lindner, a drilling fluid specialist for contractor MI-Swaco.
The pumped way more of the stuff in a unusual mix into the well. They did this because they are not allowed to dump this stuff into the water, so it was cheaper to pump it into the well then pay to haul it back to shore and dispose of it properly.
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Well site leader Ronald Sepulvado told a Marine Board investigative panel in Kenner that before he wrapped up his stint as BP's top man on the rig four days before the April 20 accident, he reported that one of the control pods on the blowout preventer, or BOP, had a leak.
He said he told his supervisor in Houston, BP team leader John Guide, and assumed that Guide would notify federal regulators at the Minerals Management Service. According to investigators, that never happened.
The blow out preventer had problems in the days right before the disaster. By law, the rig should stop until the unit is checked and working correctly, but the team leader didn't consider it important enough to report.
BP was pushing the edge all over the place on this drilling rig.
Jay