Gas lift valve for high pressure operation

Details Gas lift valve for high pressure operation Gas lift valve for high pressure operation

2008-05-13

2008-05-13

Gay, Jennifer H. (Department: 3676)

Wells

Processes

Producing the well

C166S373000, C137S155000

Reexamination Certificate

active

07370706

ABSTRACT:
A unique gas lift valve bellows assembly in which an internal piston incorporated within the bellows provides over travel prevention and over pressure protection during valve operation, independent of the set or operating gas pressures exerted on the gas lift valve. The piston separates a hydraulic damping reservoir in the interior convolutions of the bellows from the upper gas volume chamber. The piston travels a pre-set distance between two stops to provide a fluid dampened hydraulic balance across the bellows convolutions in both the open and closed positions of the valve. This results in a long lived bellows valve that can operate with any pressure up to the limits of the material, without overstressing the bellows.

REFERENCES:
patent: 3225783 (1965-12-01), Stacha
patent: 3318322 (1967-05-01), Garrett
patent: 3834414 (1974-09-01), McMurry
patent: 3888273 (1975-06-01), Douglas
patent: 4111608 (1978-09-01), Elliott et al.
patent: 4592380 (1986-06-01), Hamm
patent: 4625941 (1986-12-01), Johnson
patent: 5170815 (1992-12-01), Going et al.
patent: 6932581 (2005-08-01), Messick
patent: 2006/0043683 (2006-03-01), Ocalan

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