Valve

Details Valve Valve

1982-04-15

1984-04-10

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Destructible element

166322, 166321, 166332, 137 71, E21B 3408, E21B 3410

Patent

active

044415583

ABSTRACT:
A well system in which a dual annular type valve with wall flow ports, operable by ambient pressures, is utilized as part of the well tool string to provide an unrestricted flow path for production through and prevent excess back pressure on the producing formation. The valve has outside seals and internal valves above and below the wall ports controlling flow therethrough. Higher pressure outside the valve will open the biased closed lower sleeve valve to production flow through the wall ports into the flow path through the well production tubing. If pressure in the flow path through increases, both valves close preventing flow out through the wall ports. Increasing flow path pressure to a predetermined value shears lower valve seat positioning pins to open wall flow ports to high volume flow pumped into the formation to kill the well and to two-way flow afterward.

REFERENCES:
patent: 3874634 (1975-04-01), Gazda
patent: 3990511 (1976-11-01), Gazda
patent: 4044829 (1977-08-01), Jessup et al.
patent: 4201364 (1980-05-01), Taylor

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