Circulation sub with indexing mechanism

E - Fixed Constructions – 21 – B

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Details

E21B 34/14 (2006.01) E21B 33/12 (2006.01) E21B 34/06 (2006.01)

Patent

CA 2705295

A downhole circulation sub or valve (105) includes a tubular housing with an outer port (140) and a valve piston (170) slidably disposed in the housing. A primary fluid flow path (130) extends through an inner flow bore of the housing and valve piston. In a first position, the valve piston isolates the outer port to prevent fluid communication between the inner flow bore and a well bore annulus. In a second position, the valve piston is moved to obstruct the inner flow bore and expose the outer port to the inner flow bore and allow fluid communication between the inner flow bore and the well bore annulus. An indexing mechanism (165) is coupled between the housing and the valve piston to guide the valve piston between the first and second positions. In some embodiments, the indexing mechanism includes a rotatable component (175).

La présente invention porte sur un raccord ou vanne de circulation de fond de trou (105) qui comprend un boîtier tubulaire avec un orifice externe (140) et un piston de vanne (170) disposé de manière coulissante dans le boîtier. Une voie d'écoulement de fluide primaire (130) s'étend à travers un alésage d'écoulement interne du boîtier et du piston de vanne. Dans une première position, le piston de vanne isole l'orifice externe pour empêcher une communication fluidique entre l'alésage d'écoulement interne et un espace annulaire du puits de forage. Dans une seconde position, le piston de vanne est déplacé pour obstruer l'alésage d'écoulement interne et exposer l'orifice externe à l'alésage d'écoulement interne et permettre une communication fluidique entre l'alésage d'écoulement interne et l'espace annulaire du puits de forage. Un mécanisme d'indexation (165) est couplé entre le boîtier et le piston de vanne pour guider le piston de vanne entre les première et seconde positions. Dans certains modes de réalisation, le mécanisme d'indexation comprend un composant rotatif (175).

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