Drill bit and system for drilling a borehole

Details Drill bit and system for drilling a borehole Drill bit and system for drilling a borehole

E - Fixed Constructions

21

B

E21B 10/32 (2006.01)

Patent

CA 2526881

A drill bit for drilling a borehole in an object, the drill bit having a central longitudinal axis and comprising a bit body provided with a central shank (2) for connecting the drill bit to a drilling system. The drill bit further comprises at least one cutting arm (9) , each cutting arm being provided with a set of cutters for cutting the object and being coupled to the bit body via pivot means (10) allowing the cutting arm to pivot between a radially retracted position and a radially expanded position. The drill bit is provided with support means (12) for supporting the cutting arm in the radially expanded position thereof, wherein the support means is arranged to transmit at least a portion of the rotational torque generated during drilling, from the cutting arm to the bit body so as to reduce or prevent transmission of said rotational torque via the pivot means.

L'invention concerne un trépan conçu pour forer un trou de sonde dans un objet, ledit trépan ayant un axe longitudinal central et comprenant un corps de trépan pourvu d'une tige centrale (2) reliant le trépan au système de forage. Ledit trépan comporte en outre au moins une bras de coupe (9), chaque bras de coupe étant pourvu d'un ensemble de couteaux pour couper l'objet en question et couplé au corps de trépan par des pivots (10) qui permettent au bras de coupe d'osciller entre une position radialement retirée et une position radialement étalée. Ledit trépan est pourvu de supports (12) qui supportent le bras de coupe dans sa position radialement étalée, lesdits supports étant conçus de manière à transmettre au moins une partie du couple de rotation produit lors du forage, du bras de coupe au corps de trépan, ce qui réduit ou empêche la transmission dudit couple de rotation par le biais des pivots.

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