cryptogon.com

It took 10 days to plug the first cracks, according to reports BP filed with the Minerals Management Service that were later delivered to congressional investigators. Cracks in the surrounding rock continued to complicate the drilling operation during the ensuing weeks. Left unsealed, they can allow explosive natural gas to rush up the shaft.

“Once they realized they had oil down there, all the decisions they made were designed to get that oil at the lowest cost,” said Peter Galvin of the Center for Biological Diversity, which has been working with congressional investigators probing the disaster. “It’s been a doomed voyage from the beginning.”

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The company attempted a “cement squeeze,” which involves pumping cement to seal the fissures, according to a well activity report. Over the following week the company made repeated attempts to plug cracks that were draining expensive drilling fluid, known as “mud,” into the surrounding rocks.

BP used three different substances to plug the holes before succeeding, the documents show.

“Most of the time you do a squeeze and then let it dry and you’re done,” said John Wang, an assistant professor of petroleum and natural gas engineering at Penn State in University Park, Pennsylvania. “It dries within a few hours.”

Repeated squeeze attempts are unusual and may indicate rig workers are using the wrong kind of cement, Wang said.

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On March 10, BP executive Scherie Douglas e-mailed Frank Patton, the mineral service’s drilling engineer for the New Orleans district, telling him: “We’re in the midst of a well control situation.”