Well flow control device

Details Well flow control device Well flow control device

1983-12-27

1985-06-04

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Destructible element

166318, 166332, 166239, 251319, E21B 3414

Patent

active

045208700

ABSTRACT:
A well flow control device for use in an oil and/or gas well tubing string for communicating between the tubing string and the annulus. A tubular body having a plurality of openings with a sleeve telescopically movable in the interior of the body and initially covering and closing the openings. A plurality of dogs are carried by the sleeve in windows which taper upwardly and inwardly. The dogs include a ball which engages a backup shoulder in the body to hold the dogs inwardly when the sleeve covers the openings. The sleeve includes a shoulder engaging the balls for limiting the extent of the inward movement of the dogs and the body includes a recess to receive the dogs when the sleeve is moved to an opening position. Mechanical or hydrostatic shear releases are provided.

REFERENCES:
patent: 2379079 (1945-06-01), Hayward
patent: 2586015 (1952-02-01), Edwards
patent: 3054415 (1962-09-01), Baker et al.
patent: 3275080 (1966-09-01), Nelson et al.
patent: 4176717 (1979-12-01), Hix

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