Annulus fluid pressure operated testing valve

Details Annulus fluid pressure operated testing valve Annulus fluid pressure operated testing valve

1990-01-16

1990-12-25

Kisliuk, Bruce M.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166321, 166323, 166331, 166386, E21B 3410, E21B 4908

Patent

active

049795686

ABSTRACT:
A method and apparatus for operating a ball valve in a test tool string for a subterranean well, including a tubular actuator for the ball valve which is movable from a closing position of the ball valve to an opening position and beyond the opening position to a lock setting position, preventing the return of the tubular actuator to the ball valve closing position until the cycle of additional movements of the tubular actuator is accomplished. A metal-to-metal seal is provided for the ball valve and a larger than normal biasing force derived from a spring and a trapped pressurized gas is applied to the tubular actuator in its valve position to insure the integrity of the metal-to-metal seal.

REFERENCES:
patent: Re29638 (1976-07-01), Nutter
patent: 3856085 (1974-12-01), Hoblen et al.
patent: 3976136 (1976-08-01), Farley et al.
patent: 4125165 (1978-11-01), Helmus
patent: 4293038 (1981-10-01), Evans
patent: 4537258 (1985-08-01), Beck
patent: 4569397 (1986-02-01), Brakhage, Jr. et al.

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