Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1986-10-29
1988-03-08
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166324, E21B 3410
Patent
active
047294337
ABSTRACT:
An oil-well safety valve and installing and retrieving tools for the valve, the valve including a movable shutter (11), an internal tubular slide (9), a return spring (10) biasing the slide toward the high position, hydraulic means driving the slide down by pressurizing a control fluid, a system (14) for anchoring the valve in a receiving sleeve (1) and packings (15, 16) in contact with the receiving sleeve (1); the valve including an anchoring system comprising a hydraulically actuated mechanical system including a tubular shuttle piston (58) subjected to the pressure of the control fluid to be moved upward by this fluid, and by a locking bushing (55) located above the shuttle piston for forcing it upwardly, so that when the bushing moves, it actuates and locks anchoring dogs (54) floating in the lock body.
REFERENCES:
patent: 3799258 (1974-03-01), Tunsch
patent: 3865141 (1975-02-01), Young
patent: 4252197 (1981-02-01), Pringle
patent: 4294314 (1981-10-01), Miyagishima et al.
patent: 4432417 (1984-02-01), Bowyer
patent: 4473122 (1984-09-01), Tamplen
patent: 4582134 (1986-04-01), Gano et al.
patent: 4605070 (1986-08-01), Morris
Diamant Boart France-SA-Division Petrole
Dutton, Jr. Harold H.
Neuder William P.
Novosad Stephen J.
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