Drill bit with protection member

Details Drill bit with protection member Drill bit with protection member

E - Fixed Constructions

21

B

E21B 10/42 (2006.01) E21B 10/32 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2546316

A method is provided for removing a body of selected material from the interior of a casing extending into a borehole formed in an earth formation. The method comprises lowering a drill bit for further drilling of the borehole, into the casing, the drill bit having a longitudinal axis of rotation during operation, the drill bit comprising rock cutting means, at least one protection member for protecting the inner surface of the casing from contact with the rock cutting means, each protection member being adapted to remove said selected material from the interior of the casing and being radially movable towards the inner surface of the casing, and control means for applying a radially outward force of controlled magnitude to the protection member. The drill bit is rotated in the casing, and the control means is operated so as to apply said radially outward force of controlled magnitude to the protection member.

L'invention porte sur un procédé d'extraction d'un corps d'un matériau donné de l'intérieur d'un tubage s'étendant dans un puits foré dans une formation terrestre le procédé consiste à poursuivre le forage du puits à l'intérieur du tubage au moyen du trépan qui tourne autour de son axe longitudinal pendant l'opération. Le trépan comprend: un moyen de broyage de la roche; au moins un élément de protection de la surface intérieure du tubage, l'empêchant d'entrer en contact avec le moyen de broyage de la roche, pouvant s'adapter au type de matériau présent dans le tubage, et pouvant se déplacer radialement vers la surface intérieure du tubage; et un moyen de commande appliquant sur l'élément de protection une force radiale centrifuge d'intensité contrôlée. C'est alors que le trépan tourne dans le tubage que le moyen de commande applique ladite force centrifuge à l'élément de protection.

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