Selective hydraulic lock-out well safety valve and method

Details Selective hydraulic lock-out well safety valve and method Selective hydraulic lock-out well safety valve and method

1991-07-18

1992-12-01

Neuder, William P.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166323, E21B 4312

Patent

active

051672847

ABSTRACT:
A hydraulically actuated subsurface well safety valve having a first hydraulic piston and cylinder assembly for normally actuating a flow tube and controlling the opening and closing of the valve. A second lock-out piston and cylinder assembly is provided for holding the valve in the open position and a hydraulically actuated release mechanism engages the lock-out for releasing the lock-out and allowing the valve to close. A releasable and engagable latch mechanism in the second assembly releasably holds the second assembly inactive but can be overcome and reengaged for multiple operations.

REFERENCES:
patent: 3786865 (1974-01-01), Tausch et al.
patent: 4062406 (1977-12-01), Akkerman et al.
patent: 4215748 (1980-08-01), Pace et al.
patent: 4273194 (1981-06-01), Pringle et al.
patent: 4624315 (1986-11-01), Dickson et al.
patent: 4796705 (1989-01-01), Carmody et al.

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