Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1987-01-13
1988-02-09
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166332, E21B 3410
Patent
active
047236060
ABSTRACT:
A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member and holding it open, an annular piston on the operator tube operative in response to control fluid pressure conducted from the well surface, a spring biasing the operator tube to a position at which the valve is closed, and a lockout sleeve mounted in tandem with the operator tube for movement simultaneously with the operator tube to a position at which the lockout sleeve holds the valve open. The operator tube and lockout sleeve are engageable by a shifting tool to operate the operator tube and lockout sleeve simultaneously. The lockout sleeve can be returned to an inoperative position by control fluid pressure moving the operator tube to a position which opens the valve closure member. The safety valve is also operable by a modified shifting tool engaging the operator tube. The shifting tool includes selective keys and separate expandable latch dogs for simultaneous coupling of the operator tube and the lockout sleeve.
REFERENCES:
patent: 3786865 (1974-01-01), Tausch et al.
patent: 3882935 (1975-05-01), Calhoun
patent: 3981358 (1976-09-01), Watkins et al.
patent: 4310051 (1982-01-01), Mott
patent: 4344602 (1982-08-01), Arendt
patent: 4378931 (1983-04-01), Adams, Jr.
patent: 4417600 (1983-11-01), Kohn
patent: 4427175 (1984-01-01), Adams, Jr.
patent: 4449587 (1984-05-01), Rodenberger et al.
patent: 4469179 (1984-09-01), Crow et al.
patent: 4479539 (1984-10-01), Tamplen et al.
patent: 4624315 (1986-11-01), Dickson et al.
Churchman Ronald K.
Dickson Rennie L.
Sizer Phillip S.
Smith Roddie R.
Vinzant Michael B.
Bui Thuy M.
Felger Thomas R.
Novosad Stephen J.
Otis Engineering Corporation
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