Wells – Valves – closures or changeable restrictors – Destructible element
Patent
1976-01-26
1977-08-02
Leppink, James A.
Wells
Valves, closures or changeable restrictors
Destructible element
166321, E21B 4312
Patent
active
040390314
ABSTRACT:
Well control valve to be installed in a tubing string for use in killing a well through use of fluid under pressure pumped down through the annulus surrounding the tubing string. When the annulus pressure exceeds a predetermined value, the valve is opened to permit the kill fluid to flow into and through the tubing string into the producing formation. The valve contains a closure member or disc, the upstream side of which is subject to the normal hydrostatic pressure of the fluid in the annulus, and also to an increase in the pressure of the annulus fluid above normal hydrostatic pressure, but its downstream side is subjected to atmospheric pressure initially. Accordingly, the closure member can be placed in its opened condition, as by rupturing it, when subjected to a predetermined increase in annulus pressure above the normal hydrostatic pressure, allowing the annulus kill fluid to flow into and through the tubing string to the producing formation.
REFERENCES:
patent: 2144144 (1939-01-01), Crickmer
patent: 3124151 (1964-03-01), Lilly
patent: 3654949 (1972-04-01), McMurry
patent: 3693644 (1972-09-01), Dilorenzo
patent: 3698411 (1972-10-01), Garrett
patent: 3722527 (1973-03-01), Blackwell
Baker Oil Tools, Inc.
Leppink James A.
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