1999 report found device on rigs failed regularly

WASHINGTON – A 1999 report commissioned by the federal agency that oversees offshore drilling suggests failures of underwater blowout preventers designed to stop oil spills like the massive one threatening the Gulf Coast were far from unknown, the chairwoman of a key Senate panel said Friday.

Citing a Minerals Management Service report, Sen. Maria Cantwell, D-Wash., said there were 117 failures of blowout preventers during a two-year period in the late 1990s on the outer continental shelf of the United States.

“To find out the ultimate fail-safe weapon doesn’t work is surprising,” said Cantwell, who as chairwoman of the Senate Commerce Committee’s oceans, atmosphere, fisheries and Coast Guard subcommittee will play a role in any congressional investigation of the Gulf oil spill and the drilling rig explosion that caused it.

The unclassified version of the 1999 report said the failures involved 83 wells drilled by 26 rigs in depths from 1,300 feet to 6,560 feet.