Apparatus and method for milling casing in jet drilling...

E - Fixed Constructions – 21 – B

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E21B 7/20 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2701725

An apparatus and method for improving control over the milling force applied to a milling bit that is turned through a rotary drive to form a hole in a wellbore casing. A bit-weighting sub is applied between the tubing used to lower the rotary drive's motor into the wellbore and the rotary drive itself, the sub serving to take the weight of the tubing off the rotary drive when the motor lands in operative connection with the drive, and further serving to apply a known milling force to the drive (and thus to the bit) independent of the weight of the tubing. In a preferred form the sub includes a spring that is compressed against the drive when the tubing and motor are landed.

L'invention concerne un appareil et un procédé pour améliorer la maîtrise de la force de forage appliquée à un outil de forage qui est tourné par un entraînement rotatif pour former un trou dans un cuvelage de puits. Un raccord intermédiaire de lestage de l'outil est appliqué entre le tubage utilisé pour abaisser le moteur de l'entraînement rotatif dans le puits et l'entraînement rotatif lui-même, le raccord servant à retirer le lestage du tubage de l'entraînement rotatif lorsque le moteur vient à terre en relation de fonctionnement avec l'entraînement, et servant en outre à appliquer une force de forage connue à l'entraînement (et ainsi à l'outil) indépendamment du lestage du tubage. Dans une forme préférée, le raccord comprend un ressort qui est comprimé contre l'entraînement lorsque le tubage et le moteur sont mis à terre.

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