Directional drilling tool

Details Directional drilling tool Directional drilling tool

E - Fixed Constructions

21

B

E21B 7/08 (2006.01) E21B 6/00 (2006.01) E21B 7/06 (2006.01) E21B 7/28 (2006.01) E21B 10/46 (2006.01) E21B 36/00 (2006.01)

Patent

CA 2306944

A rotary-percussion device for directional drilling in rock comprises a substantially cylindrical, rotatable body portion (15) housing a percussion hammer, and a frustroconical head (2) eccentrically mounted on the front of the body portion. The minimum diameter face (3) of the head is adjacent to the body portion. The axis (6) of the head is parallel to but offset from the axis (5) of the body. The front face (4) of the head is chisel-shaped and comprises at least one oblique plane (11) sloping forwardly in the same direction as the offset of the head axis relative to the body axis.

La présente invention concerne un dispositif rotatif à percussion permettant un percement directionnel dans la roche. Ce dispositif comporte, d'une part un corps rotatif (15) sensiblement cylindrique dans lequel est logé un percuteur, et d'autre part une tête tronconique (2) montée excentrique sur la face antérieure du corps. La face de petit diamètre (3) de la tête est celle qui est la plus proche du corps. L'axe de la tête (6) et l'axe du corps (5) sont parallèles et décalés. La face antérieure (4) de la tête, en forme de ciseau, présente au moins un plan oblique (11) descendant vers l'avant dans le même sens que le décalage de l'axe de la tête par rapport à l'axe du corps.

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