Hydraulic drill string accumulator

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01) E21B 21/10 (2006.01) F15B 1/02 (2006.01) F15B 1/04 (2006.01) F15B 1/24 (2006.01) F16L 55/05 (2006.01)

Patent

CA 2430003

A hydraulic accumulator for use in a drill string having a fluid passage for supply of fluid to a hydraulic drill string tool is provided.The accumulator comprises a body provided with connecing means for connecting the accumulator to the drill string and an expansion chamber in fluid communication the fluid passage when the accumulator is connected to the drill string by the connecting means. The expansion chamber is expandable between a first volume and a second volume which is larger than the first volume. Further, the expansion chamber is provided with means for moving the expansion chamber from the first to the second volume upon a fluid pressure increase in the fluid passage and for moving the expansion chambe from the second to the first volume upon a pressure decrease in the fluid passage.

L'invention concerne un accumulateur hydraulique destiné à être utilisé dans un train de forage comprenant un passage de fluide permettant l'alimentation en fluide d'un outil hydraulique du train de forage. Cet accumulateur comprend un corps qui comporte des moyens de connexion permettant de connecter l'accumulateur avec le train de forage et avec une chambre d'expansion qui se trouve en communication fluidique avec le passage de fluide lorsque l'accumulateur est connecté avec le train de forage par les moyens de connexion. La chambre d'expansion peut se dilater de manière à passer d'un premier volume à un second volume plus grand que le premier volume. En outre cette chambre d'expansion comporte des moyens permettant de faire passer la chambre d'expansion du premier volume au second volume lors d'une augmentation de la pression fluidique dans le passage de fluide et de faire passer la chambre d'expansion du second au premier volume à la suite d'une diminution de la pression dans le passage de fluide.

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