Close the annular blowout preventer as the well pressure is relatively low and force oil pipes and couplings to pass through rubber core of the annular blowout preventer.

井压较低时，关闭环型防喷器，使油管和接箍强行通过环型防喷器胶芯。

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In April, Chesapeake suspended work on a clutch of natural gas wells in Pennsylvania temporarily after a well blowout sent thousands of gallons of drilling fluid into local waterways.

FORBES: Pennsylvania Pins Record Fine on Shale-Gas Producer

BP, which had been leasing the rig from Transocean, says the safety device that was supposed to cut oil flow on the ocean floor in the event of a well blowout did not perform its function.

FORBES

Transocean ( RIG - news - people ), says the safety device that was supposed to cut oil flow on the ocean floor in the event of a well blowout did not perform its function.

FORBES: The Gulf Oil Leak