Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1970-07-01
1982-01-05
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166196, 166202, 175325, 251 1R, E21B 3306, E21B 33126, E21B 33128
Patent
active
043089186
ABSTRACT:
A blowout preventer assembly for sealing off a well blowout within the confines of the drill stem is disclosed. The blowout preventer assembly comprises an elongated collar member which is located around and is slidable along a section of the drill pipe. Each end of the collar member has an expandable portion made of rubber or the like, which is capable of being expanded to the width of the drill pipe casing. Fixedly attached to the section of drill pipe at a location above the slidable collar member is a rigid metal collar section having around its circumference a plurality of equally-spaced wing flanges tapering down from a right angle at the top of the fixed collar to a slope at the lower end thereof. The sudden pressure surge of the blowout forces the slidable member upwardly so that the rubberized end portion thereof engages and is expanded outwardly into contact with the inner wall of the well casing by means of the sloping flange wings of the fixed collar, thus sealing off the space between the drill pipe and well casing, and in effect, stopping the surge of the blowout at that point.
REFERENCES:
patent: 2449642 (1948-09-01), Coons
patent: 2669305 (1954-02-01), Condra
patent: 2696263 (1954-12-01), O'Donnell
patent: 3151690 (1964-10-01), Grable
patent: 3724541 (1973-04-01), Curry
Bonnie Corp.
Garvey, Jr. Charles C.
Novosad Stephen J.
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