Differential valve

Details Differential valve Differential valve

1976-09-27

1977-08-09

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Destructible element

166327, 137515, E21B 4300

Patent

active

040404889

ABSTRACT:
The invention is a differential fill valve apparatus principally for use in treating earth wells, usually in connection with cementing a string of casing into the well bore. The apparatus, at or near the low end of the casing, has a pressure actuated slidable piston which rises as liquid is encountered in the well bore opening parts for admitting liquid into the casing until the pressure from liquid in the casing reaches a predetermined ratio with respect to the pressure in the well bore annulus.
Means are provided for locking the piston in its closed position after the casing string is in place in the well, permitting the use of the apparatus as conventional cementing valve apparatus.

REFERENCES:
patent: 2812821 (1957-11-01), Nelson
patent: 2841171 (1958-07-01), Baker et al.
patent: 2931439 (1960-04-01), Alexander
patent: 3011559 (1961-12-01), Muse et al.
patent: 3220481 (1965-11-01), Park
patent: 3376935 (1968-04-01), Baker

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