Gas lift valve

Details Gas lift valve Gas lift valve

1977-06-22

1978-01-10

Cohan, Alan

Fluid handling

Diverse fluid containing pressure systems

Gas lift valves for wells

417116, F04F 108

Patent

active

040673502

ABSTRACT:
A gas lift valve capable of being actuated by fluid such as a predetermined liquid head in a tubing string or by gas in a casing surrounding the tubing for introducing lifting gas from the casing into the tubing for lifting liquid in the tubing from one elevation to a higher elevation, wherein the valve has an adjustable resilient means which is adjustable for different pressure conditions from externally of the valve to thereby avoid extensive disassembly and reassembly for adjustment of the resilient means, and wherein the valve stem below the bellows is virtually eliminated whereby valve stem bowing and corkscrewing with resultant problems are overcome. The resilient means is disposed above the bellows and is isolated from well fluid so that it can operate in the absence of any fluid or pressure to thereby enable the use of various resilient materials having more desirable spring rate characteristics. Drag from the spring or resilient means is minimized and essentially eliminated.

REFERENCES:
patent: 2556867 (1951-06-01), Carlisle
patent: 2797700 (1957-07-01), McGowen
patent: 3053323 (1962-09-01), Wright
patent: 3066690 (1962-12-01), Tausch

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