Wellbore system having non-return valve

Details Wellbore system having non-return valve Wellbore system having non-return valve

E - Fixed Constructions

21

B

E21B 34/08 (2006.01) E21B 34/00 (2006.01) E21B 34/10 (2006.01) E21B 43/00 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2389732

A wellbore system comprising a borehole (5, 7, 9) formed in the earth formation, the borehole being provided with a valve (60, 26, 62) having a passage for a stream of fluid flowing from an upstream side of the valve to a downstream side of the valve, a closure member (44) exposed to a drag force exerted by the stream and movable relative to the passage (40) between an open position in which the closure member allows fluid to flow through the passage and a closed position in which the closure member closes the passage, said drag force biasing the closure member to the open position thereof, and a spring (48) exerting a spring force to the closure member biasing the closure member to the closed position, wherein the spring force when the closure member is in the closed position exceeds a selected lower limit of the drag force.

L'invention concerne un système de forage comprenant un trou de forage (5, 7, 9) dans le sol, muni d'un clapet (60, 26, 62) possédant un passage destiné à l'écoulement d'un fluide depuis un côté amont dudit clapet vers un côté aval, un élément de fermeture (44) exposé à une force résistante exercée par l'écoulement et mobile, par rapport au passage (40), entre une position d'ouverture dans laquelle il permet au fluide de s'écouler à travers le passage, et une position de fermeture dans laquelle ledit élément ferme le passage, la force résistante sollicitant l'élément de fermeture vers sa position d'ouverture et un ressort (48) exerçant une force de rappel sur l'élément de fermeture, le sollicitant vers sa position de fermeture. Lorsque l'élément de fermeture se trouve dans sa position de fermeture, la force de rappel du ressort dépasse une limite inférieure sélectionnée de la force résistante.

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