(CBS/AP) A key safety device known as the blowout preventer used in the BP oil rig in the Gulf had a hydraulic leak and other problems that likely prevented it from working as designed, congressional investigators said Wednesday. They also said BP PLC and other documents also indicated confusion over whether poor pipe integrity was allowing methane gas to leak into the well just hours before the explosion that killed 11 workers and blew the well open.
Rep. Henry Waxman, D-Calif., said that BP had informed his House committee that at some point when the well was being closed with cement an influx of methane entered the wellhead, indicating that cementing the well had not produced needed pipe integrity.
Waxman, opening a hearing into the April 20 well explosion that unleashed a massive oil spill, said while "we have far more questions than answers" it appeared clear - from BP and other documents - that there were problems with the blowout preventers before the accident and confusion almost right up to the time of the explosion over the success of the cementing process.
The committee said that there were at least "four significant problems with the blowout preventer" used on the Deepwater Horizon drill rig.
