Core cutting rock bit

Details Core cutting rock bit Core cutting rock bit

E - Fixed Constructions

21

B

E21B 10/06 (2006.01) E21B 10/04 (2006.01) E21B 10/16 (2006.01)

Patent

CA 2129559

A roller cone drill bit is disclosed that leaves uncut a formation core having a diameter from 10% to 25% of the bit gage diameter. Cutters in circumferential rows away from the apex of the cones extend a sufficient distance closer to the centerline of the rock bit than the core cutters at the apex of a cone for breaking the central core. The bit is designed to have normal sizebearings, cone shell thickness and cutter protrusion to allow the use of standard drilling weights and rotary speeds, thereby achieving a significant increase in drilling rate. When drilling abrasive formations, ultra hard cutting teeth are used in the cone apex to maintain the core diameter.

Trépan à molettes laissant non découpée une carotte de formation dont le diamètre représente de 10 % à 25 % du diamètre du trépan. Les lames disposées en rangées circonférentielles s'éloignant de la pointe des molettes s'étendent à une distance suffisante plus près de l'axe du trépan que les lames de carottage à la pointe d'une molette pour briser le centre de la carotte. Le trépan est conçu pour avoir des paliers de taille normale, de même pour l'épaisseur des coquilles et la protrusion des lames, ce qui permet d'obtenir une nette amélioration de la performance de forage. Dans les formation abrasives, on utilise des dents ultradures sur la pointe des molettes pour maintenir le diamètre de la carotte.

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