Bottom hole blowout preventer

Details Bottom hole blowout preventer Bottom hole blowout preventer

E - Fixed Constructions

21

B

166/50

E21B 33/06 (2006.01) E21B 21/10 (2006.01) E21B 34/08 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2001387

TITLE: BOTTOM HOLE BLOWOUT PREVENTER INVENTOR: DONALD H. LINEHAM ABSTRACT A ball valve type bottom hole blowout preventer operates under normal drilling conditions in a fully open position with an unrestricted bore. This operating condition is maintained by a combination of spring and mud flow pressure acting against the upper surfaces of the valve. In the event of a well kick or blowout, pressures from gas or fluid volumes acting against the lower surfaces of the valve force it into the fully closed position. A system of ports and check valves within the blowout preventer forces hydraulic fluid from one chamber to another. The metering effect of these ports determines the rate of closure of the valve, thereby allowing normal running and pulling of the drill string or tubing, without interference to pipe fill-up or drainage, from valve closure. This blowout preventer is placed in a sub that is an integral park of the drill string and can be incorporated in a string in any location.

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