Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1983-10-07
1985-09-03
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166322, 166382, 166386, E21B 3410
Patent
active
045386854
ABSTRACT:
An annulus subsurface safety valve for installation between inner and outer concentric members and controlling a fluid passageway therein in which the safety valve is locked to the outer member when the fluid passageway is closed. The outer member is provided with a threaded section and the safety valve housing includes a plurality of segments carried for inward and outward movement in which the segments include threads on the outside for coacting with the threaded section. A lock is provided upon the valve closure of the safety valve and positioned to be out of engagement with the segments when the valve is in the open position but is in engagement with and locks the segments outwardly in engagement with the threaded section when the valve is in the closed position. Springs urge the segments outwardly whereby the valve may be ratcheted downwardly into the threaded section and can be released from the threaded section by opening the passageway or can be released by rotation. A metal packing seal around the housing seals against the outer member and is provided with a piston for compressing the packing when exposed to pressure between the members.
REFERENCES:
patent: 1324775 (1919-12-01), Anathor-Henriksen
patent: 3131769 (1964-05-01), Rochemont
patent: 3288221 (1966-11-01), Howard
patent: 3410348 (1968-11-01), Page
patent: 4049052 (1977-09-01), Arendt
patent: 4224987 (1980-07-01), Allen
patent: 4252197 (1981-02-01), Pringle
patent: 4273194 (1981-06-01), Pringle et al.
patent: 4363358 (1982-12-01), Ellis
Black Paul W.
Pringle Ronald E.
Camco Incorporated
Goodwin Michael
Novosad Stephen J.
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