Pressure responsive below-packer valve apparatus

Details Pressure responsive below-packer valve apparatus Pressure responsive below-packer valve apparatus

1991-09-11

1992-12-15

Bui, Thuy M.

Wells

Valves, closures or changeable restrictors

Fluid operated

166317, 166297, E21B 3300, E21B 4300

Patent

active

051708442

ABSTRACT:
A pressure responsive below packer valve apparatus which allows operation of a below packer valve through application of pressure to the wellbore annulus above the packer. The valve apparatus includes a crossover located in a tool string above the packer which communicates upper annulus pressure to a conduit inside the tool string. This conduit communicates annulus pressure to a valve mechanism below the packer. A selectively releasable mechanism such as a rupture disk communicates pressure to the valve mechanism once a threshold pressure is reached, thereby facilitating operation of the valve mechanism through application of annulus pressure.

REFERENCES:
patent: 4434854 (1984-03-01), Vann et al.
patent: 4576233 (1986-03-01), George
patent: 4846272 (1989-07-01), Leggett
patent: 5109925 (1992-05-01), Stepp et al.

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