Stage cementing valve

Details Stage cementing valve Stage cementing valve

E - Fixed Constructions

21

B

166/17

E21B 33/16 (2006.01)

Patent

CA 1315672

ABSTRACT A stage valve for stage cementing of casings in a well bore including a tubular collar and a telescopic tubular sleeve where the sleeve has a piston portion disposed in a collar chamber and the piston portion separates a sleeve port from a collar port in a lower position. In the lower position, the sleeve mechanically engages the collar and is movable to an upper position by a differential hydraulic pressure across the piston por- tion to an upper position placing the sleeve port and the collar port in fluid communication with one another. In moving to the upper position, the sleeve removes a barrier from a ratchet ring in the collar so that when the sleeve is moved downwardly from an upper position, a ratchet por- tion on the sleeve engages the ratchet ring in a lower position of the sleeve to lock the sleeve in a closed position.

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