Two drill pipes discovered inside wreckage of the well

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Second pipe may have crippled BP well's defense mechanism
Jim Tankersley, Tribune Washington Bureau

The gushing BP oil well is a mystery still unfolding, and late last month, a team of scientists from the Energy Department discovered a new twist: Their sophisticated imaging equipment detected not one but two drill pipes, side by side, inside the wreckage of the well's blowout preventer on the bottom of the Gulf of Mexico.

BP officials said it was impossible. The Deepwater Horizon rig, which drilled the well, used a single pipe, connected in segments, to bore 13,000 feet below the ocean floor. But when workers cut into the wreckage to install a containment cap this month, sure enough, they found two pipes.

The discovery suggested that the force of the erupting petroleum from BP's well on April 20 was so violent that it sent pipe segments hurtling into the blowout preventer, like derailing freight cars.

It also offered a tantalizing theory for the failure of the well's last line of defense, the powerful pinchers called shear rams inside the blowout preventer that should have cut the pipe and stopped the rising oil and gas from reaching the Deepwater Horizon 5,000 feet above. Drilling experts say those rams, believed to be partially deployed, could have been thwarted by the presence of a second pipe.

The doubled-up drill pipe joins a list of clues that is helping scientists understand the complexities of the Deepwater Horizon accident, and from that, craft changes in how deep-water drilling is conducted. More...