Downhole ball circulation tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/06 (2006.01) E21B 33/13 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2547253

A circulation toot 10 for use downhole in a well includes a housing 12 having one or more bypass ports 16 for circulation between a bore in the housing and an annulus surrounding the housing. A sleeve 68 is axially movable within the housing, and axially spaced seals 70, 74 seal between the sleeve and the housing when the sleeve is in the closed position. A ball 52 is rotatably mounted to the sleeve, and includes a seat 54 about a central bore 55 in the ball for engagement with a plug. When the sleeve closes off the circulation ports 16, the ball is rotated to the open position with a substantially full bore diameter.

Outil de circulation (10) utilisé dans fond d'un puits, comprenant une enveloppe (12) munie d'un orifice de dérivation (16) pour la circulation entre un alésage sur l'enveloppe et un espace annulaire entourant l'enveloppe. Un manchon (68) peut être déplacé sur le plan axial dans l'enveloppe, et des joints d'étanchéité espacés sur le plan axial (70, 74) assurent une étanchéité entre le manchon et l'enveloppe lorsque le manchon est à la position fermée. Une bille (52) est montée sur le manchon de façon à tourner et comprend un siège (54) autour d'un alésage central sur la bille (55) afin d'engager la bille avec un bouchon. Lorsque le manchon ferme les orifices de circulation (16), la bille tourne à la position d'ouverture à un diamètre d'alésage essentiellement intégral.

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