Rotating blowout preventer

Details Rotating blowout preventer Rotating blowout preventer

1997-08-20

2000-08-29

Lillis, Eileen D.

Wells

Above ground apparatus

With seal for reciprocating member

175195, 251 11, 277324, E21B 3303

Patent

active

061093483

ABSTRACT:
A rotating blowout preventor having a spring-steel reinforced stripper rubber removably mounted in a rotating inner housing, wherein the stripper rubber is sealed against the drill pipe by well bore pressure and externally-applied hydraulic pressure. In a preferred embodiment the externally-applied hydraulic pressure is maintained against the middle and upper portion of the stripper rubber by using a pump at a level of about ten percent above the well bore pressure to insure rotation of the stripper rubber with the drilling string and minimize rotation of the drill pipe inside the stripper rubber. A bayonet-type locking mechanism is attached to the stripper rubber for selectively removing the stripper rubber from the rotating inner housing and changing or repairing the stripper rubber.

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