Method and apparatus for formation isolation in a well

E - Fixed Constructions – 21 – B

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E21B 34/06 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2358896

An isolation system and method for use in a wellbore that passes through a formation includes a flow conduit (124) capable of receiving a fluid flow from the formation and an isolation system (100) coupled to the flow conduit (124) and including one or more uni-directional flow control devices (152). Each uni-directional flow control device (152) may be ball-type check valve, plate-type check valve, and flapper-type check valve. The one or more uni-directional flow control devices (152) are adapted to be opened by fluid flow from the formation and to be closed by pressure from a fluid column in the flow conduit (124) when the fluid flow is shut off. In another arrangement, an isolation system and method includes a valve (20), a string having a flow conduit (28) (e.g., tubing, flow tube, etc.) and a lower end, and an actuation tool (36) (e.g., a shifting tool) attached to the lower end of the string and adapted to operate the valve (20) if the string is lowered into or raised out of the wellbore.

L'invention concerne un système et un procédé d'isolation pour puits de forage traversant une formation. Un conduit d'écoulement (124) permet de recevoir un fluide de la formation, et un système d'isolation (100) est couplé à ce conduit (124). Il existe en outre un ou plusieurs dispositifs de contrôle de flux unidirectionnel (152). Chacun de ces dispositifs (152) peut être du type robinet de contrôle à bille, à plaque ou à clapet. Ce ou ces dispositifs (152) peuvent être ouverts sous l'effet d'un écoulement de fluide depuis la formation et fermés sous l'effet de la pression d'une colonne de fluide dans le conduit d'écoulement (124) lorsque l'écoulement de fluide est fermé. Selon une variante, le système et le procédé d'isolation font appel à une valve (20), une colonne à conduit d'écoulement (28) (par exemple, tubage, tube d'écoulement, etc.) et extrémité inférieure, et un instrument actionneur (36)(par exemple, instrument de sélection) fixé à l'extrémité inférieure de la colonne et capable d'actionner la valve (20) si la colonne est abaissée dans le puits ou relevée de celui-ci.

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