Drill bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/16 (2006.01) E21B 10/12 (2006.01)

Patent

CA 2421288

The invention relates to a rotary drill bit for drilling a borehole in an earth formation, the drill bit comprising a first and a second disc cutter, each disc cutter being arranged to roll along the borehole bottom during rotation of the drill bit and thereby to cut respective first and second substantially circular, radially spaced cuts in the borehole bottom so that a body of rock material is defined between said cuts. The second disc cutter is arranged to cut into the bottom of the borehole at a selected rotational interval of the drill bit behind the first disc cutter and to shear-off said body of rock material in the direction of the first cut. Each disc cutter includes a set of mutually spaced cutting members arranged to create, during a turn of the drill bit, a corresponding set of cut sections of the cut created by the disc cutter, and wherein the cutting members are arranged so that the sets of cut sections created during subsequent drill bit turns are staggered relative to each other.

L'invention concerne un trépan rotatif pour forer un trou de forage dans un sol. Ce trépan comprend une première et une seconde lames en forme de disque, chaque lame en forme de disque étant conçue de manière à rouler le long du fond de trou de forage pendant la rotation du trépan et de manière à ainsi couper respectivement une première et une seconde coupes espacées radialement, sensiblement circulaires, dans le fond de trou de forage. Ainsi, un corps de matériau rocheux est défini entre ces coupes. La seconde lame en forme de disque est conçue pour couper dans le fond du trou de forage à un intervalle de rotation choisi du trépan à l'arrière de la première lame en forme de disque, et pour cisailler ledit corps de matériau rocheux en direction de la première coupe. Chaque lame en forme de disque comprend un ensemble d'éléments coupants espacés les uns des autres et conçus pour former, pendant un tour du trépan, un ensemble correspondant de sections coupées de la coupe formée par la lame en forme de disque. Les éléments coupants sont conçus pour que les ensembles de sections coupées formées pendant les tours subséquents de trépan soient décalées en quinconce les unes par rapport aux autres.

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