Pressure control device

Wells – Above ground apparatus – With means facilitating connecting or disconnecting...

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Details

166 77, 166 81, 166 82, 254 29R, E21B 1916

Patent

active

041627040

ABSTRACT:
A pressure control device is disclosed which forms a pressure containing enclosure around a tubing string coupling to contain therein any released pressure as the tubing is uncoupled. Means are provided to form a pressure seal against the outside surface of the tubing string above and below the pipe coupling. This means also includes a blowout preventor to seal off the open end of the tubing string in the presence of uncontrolled release of fluids and gases. Lifting means are provided to raise and lower the pressure containing enclosure, to permit exposing the open end of the tubing string above the device for the safe and rapid attachment of a safety valve. Slip sets are provided to grip the lower and upper joints of pipe to support the weight of the tubing string and to allow the upper joint to be rotated relative to the lower joint to thereby uncouple the joints. Means are provided to plumb the device to align the central opening of the pressure control device, through which the tubing string passes, with the axis of the string. The central opening of the pressure containing enclosure is of sufficient diameter to permit the passage of tools and controls of larger diameter than the tubing but which are part of the tubing string.

REFERENCES:
patent: 1819211 (1931-08-01), Tomeshko
patent: 2994379 (1961-08-01), Brown
patent: 3096075 (1963-07-01), Brown
patent: 3100015 (1963-08-01), Regan
patent: 3797570 (1974-03-01), Leutwyler
patent: 3999610 (1976-12-01), Sage et al.

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