Rotating blowout preventor with rigid washpipe

Details Rotating blowout preventor with rigid washpipe Rotating blowout preventor with rigid washpipe

E - Fixed Constructions

21

B

166/50

E21B 43/12 (2006.01) E21B 33/08 (2006.01)

Patent

CA 1094949

ROTATING BLOWOUT PREVENTOR WITH RIGID WASHPIPE ABSTRACT OF THE INVENTION A rotating blowout preventor of simplified construc- tion which requires no kelly drive bushing, and which has a rotating external housing formed at the upper marginal end thereof within which the main bearings and seals are isolated. The external housing rotates about a fixed washpipe and sup- ports a stripper seal doughnut to which a stripper seal is mounted in underlying relationship thereto. A removal clamp enables the doughnut and stripper rubber to be lifted free of the assembly for service or replacement. The bearing housing is fabricated in a manner to enable servicing the seals and bearings thereof without removing the blowout preventor from the top of a tool string. The bearing housing and seals there- fore are arranged respective to the rotating stripper rubber such that should leakage across the stripper rubber and seal occur, the isolated bearing housing will be maintained free of contamination therefrom. - 1 -

313617

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