Wells – Above ground apparatus – With seal for reciprocating member
Patent
1980-10-31
1983-01-11
Purser, Ernest R.
Wells
Above ground apparatus
With seal for reciprocating member
166 88, 277 31, 277188A, 175195, E21B 3303
Patent
active
043677959
ABSTRACT:
A rotating blowout preventor having a rotating head to which a stripper assembly is attached. The stripper rubber of the stripper assembly has an axial passageway through which a rotating member is telescopingly received. The stripper rubber has an upper, conical face which downwardly slopes inwardly towards the axial passageway. The stripper assembly is mounted to an annular metal doughnut member having an axial passageway formed therethrough which is slightly larger in inside diameter as compared to the outside diameter of the rotating member extending along the axial centerline of the RBOP. The doughnut has a lower conical face which downwardly slopes inwardly towards the axial centerline of the RBOP, and which is placed closely adjacent to the upper conical face of the stripper rubber. This construction increases the working pressure of the RBOP for the reason that increased pressure differential across the stripper rubber causes the upper conical face of the rubber to slidably seat against the lower conical face of the doughnut, thereby precluding cold flow of rubber in an uphole direction. Reinforcements placed within the stripper rubber further increases the allowable pressure drop across the RBOP, as well as assisting the enlargement of the axial passageway as various rotating members are forced through the stripper rubber.
REFERENCES:
patent: 2192805 (1940-03-01), Seamark
patent: 3096096 (1963-07-01), Banks
patent: 3387851 (1968-06-01), Cugini
patent: 4154448 (1979-05-01), Biffle
Bates Marcus L.
Purser Ernest R.
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