Fluid injection valve for wells

Details Fluid injection valve for wells Fluid injection valve for wells

1975-09-26

1976-11-23

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

137155, E21B 4312

Patent

active

039931293

ABSTRACT:
A fluid injection valve for use in a well tubing having an opening therein in which the valve controls the flow of fluid flowing between the outside of the tubing and the inside of the tubing through the opening. A spring-loaded relief valve element yieldably closes a port in the valve against the flow of fluid and a closed flexible pressurized chamber is provided with one end being movably positioned against the valve element. The exterior of the chamber is exposed to the valve outlet pressure so that in the event that the outlet pressure drops below a predetermined amount, the chamber will expand and act against the valve element to close the valve. The chamber may be a bellows and the cross-sectional area of the chamber is preferably greater than the cross-sectional area of the port to provide a closure force sufficient to overcome a hydrostatic head outside of the tubing.

REFERENCES:
patent: 2465060 (1949-03-01), Carlisle et al.
patent: 2556867 (1951-06-01), Carlisle et al.
patent: 3208398 (1965-09-01), Douglas
patent: 3324803 (1967-06-01), Kelley et al.
patent: 3363581 (1968-01-01), Kelley et al.
patent: 3741299 (1973-06-01), Terral
patent: 3792714 (1974-02-01), Miller

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