Downhole apparatus

Details Downhole apparatus Downhole apparatus

E - Fixed Constructions

21

B

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

Patent

CA 2365331

Downhole apparatus (10) comprises a body (12) for mounting on a tubular string, the body (12) defining an internal bore. A fluid pressure actuated valve member (14) is movable relative to the body (12) and a normally closed flow port (18) is provided in the valve member (14). With the valve member (14) in a first position relative to the body (12) the port (18) is closed, and with the valve member (14) in a second position the port (18) is open to permit fluid communication therethrough between the body bore and the exterior of the body. The valve member (14) is biassed towards the first position. A fluid pressure actuated latch arrangement (44) releasably retains the valve member (14) in the first position, the latch arrangement (44) being releasable on application of a predetermined cracking pressure to allow the unlatched valve member (14) to move to the second position in response to a valve opening pressure lower than the cracking pressure. The latch (44) is resettable to relatch the valve member (14) on return of the valve member to the first position.

Selon cette invention, un appareil de fond de puits (10) comprend un corps (12) destiné au montage sur une tige tubulaire, le corps (12) délimitant un alésage interne. Un élément de soupape (14) activé par pression de liquide (14) peut se déplacer par rapport au corps (12). Cet élément de soupape (14) comporte un orifice pour flux (18) normalement fermé. Lorsque l'élément de soupape (14) est en première position par rapport au corps (12), l'orifice (18) est obturé, et lorsque l'élément de soupape (14) est en deuxième position, l'orifice (18) s'ouvre pour permettre la communication fluidique entre l'alésage dans le corps et l'extérieur du corps. L'élément de soupape (14) est sollicité en direction de la première position. Un système de verrouillage (44) activé par fluides retient de façon libérable l'élément de soupape (14) en première position, ledit système de verrouillage (44) se libérant lors de l'application d'une pression d'ouverture partielle pour permettre à l'élément de soupape (14) non verrouillé de se mettre en deuxième position sous l'effet d'une pression d'ouverture de soupape qui est inférieure à la pression d'ouverture partielle. Le verrou (44) peut être remis en place pour verrouiller de nouveau l'élément de soupape au retour de l'élément de soupape en première position.

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