Downhole adjustable bent-angle mechanism for use with a...

E - Fixed Constructions – 21 – B

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E21B 7/08 (2006.01)

Patent

CA 2733064

A housing including longitudinally extending tubular members interconnected to allow controlled relative bending thereof, during a drilling operation, a rotary drive transmitting torsion bar extending generally longitudinally within the housing to controllably bend in response to relative bending of said members, a rotary drill bit operatively connected to said torsion bar to be rotated as the bar rotates, a rotary drive operatively connected to the torsion bar to rotate the bar, means for controlling relative bending of the said members during torsion bar rotation and as a function of such rotation.

Selon l'invention, un boîtier comprend des éléments tubulaires s'étendant longitudinalement interconnectés de façon à permettre une courbure relative contrôlée de ceux-ci, durant une opération de forage, une barre de torsion transmettant un entraînement rotatif s'étendant globalement longitudinalement à l'intérieur du boîtier de façon à s'incurver de façon contrôlable en réponse à une courbure relative desdits éléments, un trépan rotatif relié de façon fonctionnelle à ladite barre de torsion de façon à être amené à tourner lorsque la barre tourne, un entraînement rotatif relié de façon fonctionnelle à la barre de torsion pour faire tourner la barre, et des moyens pour contrôler la courbure relative desdits éléments durant la rotation de la barre de torsion et en fonction de cette rotation.

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