Expandable bit with a secondary release device

Details Expandable bit with a secondary release device Expandable bit with a secondary release device

E - Fixed Constructions

21

B

E21B 10/62 (2006.01) E21B 10/20 (2006.01) E21B 10/42 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2615667

The present invention generally relates to an apparatus and method of forming a wellbore. In one aspect, an expandable bit for use in a wellbore is provided. The expandable bit includes a body and a blade assembly disposed on the body. The blade assembly is movable between a closed position whereby the expandable bit has a smaller outer diameter and an open position whereby the expandable bit has a larger outer diameter. The expandable bit further includes a release assembly for providing a secondary means to move the blade assembly from the open position to the closed position. In another aspect, a method of forming a wellbore is provided. In yet another aspect, an expandable apparatus for use in forming a wellbore is provided.

La présente invention concerne habituellement un dispositif et une méthode permettant de former un puits de forage. Dans une réalisation, un outil extensible à utiliser dans un puits de forage est fourni. L'outil extensible comprend un corps et un ensemble de lames disposés sur le corps. L'ensemble de lames se déplace entre une position fermée où l'outil extensible a un diamètre externe plus petit et une position ouverte où l'outil extensible a un diamètre externe plus grand. L'outil extensible comprend également un ensemble de dégagement afin de fournir un deuxième moyen de déplacer l'ensemble de lames de la position ouverte à la position fermée. Dans une autre réalisation, une méthode permettant de former un puits de forage est fournie. Dans encore une autre réalisation, un dispositif extensible à utiliser dans la formation d'un puits de forage est fourni.

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