Flow controlling safety valve

Details Flow controlling safety valve Flow controlling safety valve

1974-10-09

1976-04-06

Leppink, James A.

Wells

Screens

Porous material

251282, 251338, E21B 4312

Patent

active

039483185

ABSTRACT:
A well safety valve comprises:
A tubing in a well and having a first side port through which well production fluid is flowable,
B first means including a valving sleeve movable up and down between predetermined positions on the tubing to control flow of production fluid through said port, said means having surfaces exposed upwardly and downwardly to said flow and characterized in that the upward force exerted by said flow on said means is substantially equal to the downward force exerted by said flow on said means,
C said means having a control surface to receive selective application of control fluid pressure for moving the sleeve valve in one direction between said positions.

REFERENCES:
patent: 3288221 (1966-11-01), Howard et al.
patent: 3313350 (1967-04-01), Page, Jr.
patent: 3361212 (1968-01-01), Page, Jr.
patent: 3662824 (1972-05-01), Page, Jr.

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