Pressure activated release member for an expandable drillbit

Details Pressure activated release member for an expandable drillbit Pressure activated release member for an expandable drillbit

E - Fixed Constructions

21

B

E21B 10/62 (2006.01) E21B 10/00 (2006.01)

Patent

CA 2615798

An apparatus for use in a wellbore. The apparatus includes a body and a blade assembly. The blade assembly is movable between a collapsed position whereby the expandable apparatus has a smaller outer diameter and an expanded position whereby the expandable apparatus has a larger outer diameter. The apparatus further includes a pressure activated member for selectively allowing the blade assembly to move from the closed position to the open position. A method for using the apparatus, wherein a drill string with an expandable bit at the end thereof is lowered into the wellbore. Thereafter, the pressure activated member is activated to allow the cutting members to move from the collapsed position to the expanded position. Subsequently, the expandable bit is rotated to form a portion of the wellbore. Next, the expandable bit is deactivated and the cutting members are moved from the expanded position to the collapsed position.

Un appareil à utiliser dans un puits de forage. L'appareil est muni d'un corps et d'un ensemble de lames. L'ensemble de lames peut se déplacer d'une position rentrée, où l'appareil rétractable présente un diamètre extérieur plus petit, à une position déployée, où l'appareil rétractable présente un plus grand diamètre extérieur. L'appareil comprend aussi un élément actionné par pression permettant de manière sélective à l'ensemble de lames de se déplacer de la position rentrée à la position déployée. Une méthode d'utilisation de l'appareil, dans laquelle un train de forage muni d'un trépan extensible à son extrémité est abaissé dans le puits de forage. Par la suite, l'élément actionné par pression est mis en marche pour permettre aux éléments de coupe de se déplacer de la position rentrée à la position déployée. Par la suite, le trépan extensible est désactivé et les éléments de coupe retournent de la position déployée à la position rentrée.

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