Subsurface shutoff valve and control means

Details Subsurface shutoff valve and control means Subsurface shutoff valve and control means

1975-08-11

1976-07-20

Leppink, James A.

Wells

Automatic

166 72, 166224A, 251 5, E21B 4312

Patent

active

039701441

ABSTRACT:
A shutoff valve and control means particularly adapted for subsurface use in oil or gas wells, the shutoff valve being in the form of a sleeve having both circumferential and pre-stressed-longitudinal reinforcing, so arranged as to permit radial contraction of the sleeve under external closing pressure until passage therethrough is completely closed, while preventing rupture of the sleeve from pressure differential, between either its ends or its exterior and interior; the shutoff valve, being controlled by a set of four control valves and a pressure-fluid reservoir, both adjacent to the shutoff valve, is connected to the surface by a control line and a vent line; the set of control valves comprising an emergency-delivery valve, a overriding-delivery valve, a low-pressure vent-valve, and a high-pressure vent-valve.

REFERENCES:
patent: 3338310 (1967-08-01), McGill
patent: 3396448 (1968-08-01), Kisling
patent: 3494588 (1970-02-01), Kisling
patent: 3703213 (1972-11-01), Kammerer et al.

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