Fluid handling – Diverse fluid containing pressure systems – Gas lift valves for wells
Patent
1990-03-02
1991-06-11
Cohan, Alan
Fluid handling
Diverse fluid containing pressure systems
Gas lift valves for wells
13763015, F04F 120
Patent
active
050224271
ABSTRACT:
A lift gas safety valve has a compound valve closure assembly which will close automatically upon loss of hydraulic control pressure, and which can be reopened and maintained in the open position by the application of hydraulic control pressure at a relatively low pressure level. A primary valve closure member is slideably mounted onto a valve stem for movement to a seated position on the valve body in which a lift gas flow passage is closed, to an unseated position in which the lift gas flow passage is opened. A bypass flow passage is formed between the stem and the primary valve closure member for establishing fluid flow communication between the lift gas flow passage and the outlet port when the primary valve closure member is in its seated position. The auxiliary valve closure member is mounted onto the valve stem for movement from a seated position on the primary valve closure member to an unseated position for selectively closing and opening the bypass flow passage. According to this arrangement, when the auxiliary valve closure member is moved to its open position, the pressure differential across the safety valve is equalized, thereby permitting the main valve closure member to be unseated by the application of hydraulic control fluid at a relatively low pressure level.
REFERENCES:
patent: 2710019 (1955-06-01), Reasoner
patent: 3592561 (1971-07-01), Chenoweth
patent: 3631887 (1972-01-01), Schechtriem
patent: 4111608 (1978-09-01), Elliott
patent: 4294313 (1981-10-01), Schwegman
patent: 4295796 (1981-10-01), Moore
patent: 4480697 (1984-11-01), Goldaniga et al.
patent: 4524833 (1985-06-01), Hilts et al.
patent: 4540047 (1985-09-01), Akkerman
patent: 4589482 (1986-05-01), Bayh, III
patent: 4624310 (1986-11-01), Echols et al.
patent: 4632184 (1986-12-01), Renfroe, Jr. et al.
patent: 4682656 (1987-07-01), Waters
Geyelin, J. L., "Field Experience in Down Hole Annulus Safety Valve", Society of Petroleum Engineers, SPE No., p. 19278/1, Sep. 5, 1989.
Churchman Ronald K.
Le Nam Van
Meaders Michael W.
Cohan Alan
Griggs Dennis T.
Otis Engineering Corporation
LandOfFree
Annular safety system for gas lift production does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Annular safety system for gas lift production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Annular safety system for gas lift production will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-776580