Underreamer and method of use

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/32 (2006.01) E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2388241

An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resist premature engagement of the cutter arms (40) and to return the cutters (40) to the body upon conclusion of the underreaming job. Skewed longitudinal grooves (45) are formed in the tubular body thereby permitting the flowpath through the underreamer to provide substantially the same inner diameter throughout the tool (5).

La présente invention concerne un élargisseur fait d'un corps tubulaire traversé longitudinalement d'un alésage. Cet élargisseur se comporte en actionneur de piston intégré réagissant à une pression hydraulique de façon à amener des lames à s'appliquer contre le puits foré et contre des ressorts de façon, d'une part à s'opposer à l'application prématurée des bras des lames, et d'autre part à renvoyer les lames sur le corps dès la conclusion du travail d'élargissement. Des rainures longitudinales asymétriques pratiquées dans le corps tubulaire permettent un écoulement de fluide dans l'élargisseur de façon à maintenir le diamètre intérieur sensiblement constant sur toute la longueur de l'outil.

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