Percussive drill bit, drilling system comprising such a...

E - Fixed Constructions – 21 – B

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E21B 10/36 (2006.01) E21B 10/38 (2006.01)

Patent

CA 2526249

A percussion drill bit for drilling into a subterranean earth formation, the drill bit having a central longitudinal axis and being operable by applying axial percussive motion along the axis and rotary motion about the axis, the drill bit comprising: a plurality of blades (61, 62, 63) protruding from the drill bit; a plurality of flow channels (71, 72,73) stretching along the drill bit in a substantially radial direction whereby the successive flow channels are formed between two adjacent blades; shear cutters (9) which are provided in a row on or close to the leading edge of at least one of said blades with respect to the direction of rotary motion trailingly adjacent to the flow channel that is associated with it, for running a fluid through and thereby removing cutting debris accumulating in front of the row of shear cutters; and in addition to these shear cutters; axial cutters (10, 11) which are located, with respect to the direction of rotary motion, in a trailing position with respect to said row of shear cutters and its associated flow channel.

Cette invention concerne un trépan à percussion servant à réaliser un forage dans une formation terrestre souterraine, lequel trépan comprend un axe longitudinal central et peut être actionné sous l'effet d'un mouvement de percussion axial appliqué le long de l'axe et d'un mouvement rotatif appliqué autour de l'axe, lequel trépan comprend : une pluralité de lames (61, 62, 63) dépassant du trépan ; une pluralité de canaux d'écoulement (71, 72, 73) s'étendant le long du trépan dans une direction sensiblement radiale, lesquels canaux d'écoulement successifs sont formés entre deux lames adjacentes ; des organes coupants de cisaillement (9) qui sont disposés en rang sur ou à proximité du bord d'attaque d'au moins une de ces lames par rapport au sens du mouvement rotatif située juste derrière le canal d'écoulement correspondant, ce qui permet au fluide de s'écouler et de ce fait d'éliminer les débris de découpe s'accumulant devant la rangée d'organes coupants de cisaillement ; et, outre ces organes coupants de cisaillement, des organes coupants axiaux (10, 11) qui sont situés, par rapport au sens du mouvement rotatif, immédiatement derrière ladite rangée d'organes coupants de cisaillement et le canal d'écoulement correspondant.

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