Improved gas lift system

F - Mech Eng,Light,Heat,Weapons – 04 – F

Patent

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Details

F04F 1/20 (2006.01) E21B 43/12 (2006.01) F04B 47/00 (2006.01) F04F 1/08 (2006.01)

Patent

CA 2717366

An improved gas lift system is provided. In certain embodiments, the gas lift system includes a first tubing string and a second tubing string disposed within the first tubing string. The second tubing string is movable between a first position and a second position. Inflow of production fluids through an aperture in the first tubing string is selectively blocked when the second tubing string is in the second position. A port in the second tubing string delivers lift gas to the annulus between the first tubing string and the second tubing string. In the first position, the port is blocked to prevent fluid communication between the second tubing string and the first tubing string. In the second position, the port is uncovered to permit fluid communication between the second tubing string and the first tubing string, while a sealing member provides a seal that isolates the fluid communication from a well formation.

L'invention concerne une amélioration apportée à un système dallègement au gaz. Dans certains modes de réalisation, le système dallègement au gaz contient une première colonne de tubage et une seconde colonne de tubage disposée dans la première colonne de tubage. La seconde colonne de tubage est mobile entre une première position et une seconde position. Larrivée des fluides de production à travers une ouverture pratiquée dans la première colonne de tubage est bloquée de manière sélective lorsque la seconde colonne de tubage se trouve dans la seconde position. Un orifice pratiqué dans la seconde colonne de tubage injecte le gaz dallègement dans lespace annulaire situé entre la première colonne de tubage et la seconde colonne de tubage. Dans la première position, lorifice est bloqué pour empêcher toute communication fluide entre la seconde colonne de tubage et la première colonne de tubage. Dans la seconde position, lorifice est découvert pour permettre une communication fluide entre la seconde colonne de tubage et la première colonne de tubage, tandis quun élément d'étanchéité assure létanchéité nécessaire pour isoler la communication fluide dune formation de puits.

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