Stripper rubbers for drilling heads

Details Stripper rubbers for drilling heads Stripper rubbers for drilling heads

1990-07-31

1991-11-05

Novosad, Stephen J.

Wells

Above ground apparatus

With seal for reciprocating member

175 84, 277 31, E21B 3303, E21B 3308

Patent

active

050624792

ABSTRACT:
A stripper rubber for use in a drilling head to seal against a work string deployable through the drilling head. The stripper rubber is longitudinally restrained to prevent extrusion of the stripper under pressure and to reduce the tensile and compressive stresses on the stripper rubber. One embodiment of the stripper rubber incorporates upper and lower metal rings which are maintained in spaced apart relation by vertical rods thereby allowing radial expansion as tool joints pass through the rubber but prevents inversion of the stripper rubber under pressure. Reinforcing cords added to the stripper rubber increase the longitudinal strength. A second embodiment bonds a stripper rubber into a cylinder which restrains the rubber in the vertical direction. Radial deflection is accomodated by allowing the rubber to flow vertically as a tool joint passes therethrough. Each of the stripper rubbers incorporates an integrally formed drive bushing which facilitates mounting within the drilling head.

REFERENCES:
patent: 1942366 (1934-01-01), Seamark
patent: 3400938 (1968-09-01), Williams
patent: 3934887 (1976-01-01), Biffle
patent: 3965987 (1976-06-01), Biffle
patent: 4154448 (1979-05-01), Biffle
patent: 4363357 (1982-12-01), Hunter
patent: 4367795 (1983-01-01), Biffle
patent: 4423775 (1984-01-01), Wilson
patent: 4441551 (1984-04-01), Biffle
patent: 4500094 (1985-02-01), Biffle
patent: 4955436 (1990-09-01), Johnston

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