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Using robot submarines, BP plans to cut away the riser pipe this week and place a cap-like containment valve over the blowout preventer. On Monday, live video feeds showed robot submarines moving equipment around and using a circular saw-like device to cut small pipes at the bottom of the Gulf. BP failed to plug the leak Saturday with its top kill, which shot mud and pieces of rubber into the well but couldn't beat back the pressure of the oil. The oil company also announced plans Monday to try attaching another pipe to a separate opening on the blowout preventer with some of the same equipment used to pump in mud during the top kill. The company also wants to build a new freestanding riser to carry oil toward the surface, which would give it more flexibility to disconnect and then reconnect containment pipes if a hurricane passed through. Neither of those plans would start before mid-June and would supplement the cut-and-cap effort.
But the best chances for sealing off the leak are two relief wells, the first of which won't be ready until August. The spill has already leaked between 19.7 million and 43 million gallons, according to government estimates. For the relief well to succeed, the bore hole must precisely intersect the damaged well, which experts have compared to hitting a target the size of a dinner plate more than two miles into the earth. If it misses, BP will have to back up its drill, plug the hole it just created, and try again. "The probability of them hitting it on the very first shot is virtually nil," said David Rensink, incoming president of the American Association of Petroleum Geologists, who spent most of his 39 years in the oil industry in offshore exploration. "If they get it on the first three or four shots they'd be very lucky." The trial-and-error process could take weeks, but it will eventually work, scientists and BP said. Then engineers will then pump mud and cement through pipes to ultimately seal the well. On the slim chance the relief well doesn't work, scientists weren't sure exactly how much
-- or how long -- the oil would flow. The gusher would continue until the well bore hole collapsed or pressure in the reservoir dropped to a point where oil was no longer pushed to the surface, said Tad Patzek, chair of the Petroleum and Geosystems Engineering Department at the University of Texas-Austin. BP said it doesn't know how much oil is in the reservoir because it was starting to collect and analyze data on its size when the rig exploded April 20. In Patzek's mind, failing to get the relief wells to work isn't an option. "I don't admit the possibility of it not working," he said.
[Associated
Press;
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