Low pressure responsive tester valve with spring retaining means

Details Low pressure responsive tester valve with spring retaining means Low pressure responsive tester valve with spring retaining means

1985-12-12

1987-03-03

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166323, 166331, E21B 3408

Patent

active

046468382

ABSTRACT:
An annulus pressure responsive tester valve has a housing with a flow passage disposed therethrough. A full opening ball valve is disposed in the housing. A differential pressure responsive power piston is slidably disposed in the housing and operatively connected to the ball valve. A resilient spring retaining assembly is operatively associated with the power piston ad the housing for releasably retaining the power piston in a position corresponding to an open position of the ball valve until a force urging the power piston toward a position corresponding to a closed position of the ball valve exceeds a retaining force provided by the resilient spring retaining assembly. This, combined with an appropriate selection of flow restrictors in a metering cartridge associated with a compressed nitrogen chamber located below the power piston, allows the tester valve to have its ball valve left in an open position by bleeding off well annulus pressure at a sufficiently low rate.

REFERENCES:
patent: 3856085 (1974-12-01), Holden et al.
patent: 4105075 (1978-08-01), Helmus
patent: 4113012 (1978-09-01), Evans et al.
patent: 4125165 (1978-11-01), Helmus
patent: 4355685 (1982-10-01), Beck
patent: 4422506 (1983-12-01), Beck
patent: 4429748 (1984-02-01), Beck
patent: 4448254 (1984-05-01), Barrington
patent: 4537258 (1985-08-01), Beck
patent: 4553598 (1985-11-01), Meek et al.
patent: 4557333 (1985-12-01), Beck

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