Annular blowout preventer

Details Annular blowout preventer Annular blowout preventer

1976-09-10

1978-07-11

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

251 5, 277 73, E21B 3306

Patent

active

040996999

ABSTRACT:
There is disclosed an annular blowout preventer having a packer which is surrounded by an annulus of resilient material, and an operating system which includes means for longitudinally compressing the outer annulus in order to constrict its inner circumference and thereby move the packer from an expanded position, in which it opens the bore through a housing in which the packer and outer annulus are received, to a constricted position in which it closes the bore by sealing about a pipe in the bore or upon itself.

REFERENCES:
patent: 2148844 (1939-02-01), Stone et al.
patent: 2609836 (1952-09-01), Knox
patent: 2760750 (1956-08-01), Schweitzer et al.
patent: 2812197 (1957-11-01), Gibson
patent: 3328040 (1967-06-01), Prichard
patent: 3572627 (1971-03-01), Jones
patent: 3667721 (1972-06-01), Vujasinovic

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