Reaming tool suitable for running on casing or liner and...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/26 (2006.01) E21B 10/43 (2006.01) E21B 17/14 (2006.01)

Patent

CA 2651823

A reaming tool (10) includes a tubular body (12) having a nose portion (14) with a concave center. A plurality of blades (20) defining junk slots (24) therebetween extend axially behind the nose (14) and taper outwardly from the exterior of the tubular body. Rotationally leading edges of the blades (20) carry a plurality of cutting elements (30) from the axially leading ends. Selected surfaces and edges of the bear tungsten carbide, which may comprise crushed tungsten carbide. The shell of the nose (14) is configured to ensure drill out from the centerline thereof toward the side wall (16) of the tubular body. A method of drilling out a reaming tool is also disclosed.

L'invention concerne un outil d'alésage comprenant un corps tubulaire, présentant une partie nez et un centre concave. Une pluralité de lames créant des évidements de déchets métalliques entre elles, s'étendent axialement à l'arrière du nez et décroissent à l'extérieur du corps tubulaire. Les bords d'attaque rotatifs des lames comportent une pluralité d'éléments coupants à partir des extrémités d'attaque axiales. L'invention concerne également les surfaces sélectionnées et les bords des éléments de support en carbure de tungstène qui peuvent comprendre du carbure de tungstène broyé. L'enveloppe du nez est configurée de manière à assurer le retrait par forage de la ligne centrale vers la paroi latérale du corps tubulaire. L'invention concerne un procédé de retrait par forage d'un outil d'alésage.

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