Superabrasive cutting elements with enhanced durability and...

E - Fixed Constructions – 21 – B

Patent

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E21B 10/567 (2006.01)

Patent

CA 2672836

A cutting element for use in drilling subterranean formations. The cutting element includes a superabrasive table mounted to a supporting substrate. The superabrasive table includes a two-dimensional cutting face having a cutting edge along at least a portion of its periphery, and a surface comprising a chamfer extending forwardly and inwardly from proximate a peripheral cutting edge at a first acute angle of orientation of greater than about 45° with respect to the longitudinal axis of the cutting element, and to no greater than a selected depth. The chamfer may be arcuate or planar, and of a dimension sufficient to ensure that a wear flat generated during use of the cutting element remains outside the inner boundary of the chamfer within the chamfer envelope, and small enough to maintain aggressive cutting characteristics for the cutter. Drill bits and drilling tools bearing the cutting elements are also disclosed.

Élément de découpe pour le forage de formations souterraines, comprenant une table ultra-abrasive montée sur un support, laquelle comporte une face de découpe bidimensionnelle à tranchant situé le long d'au moins une partie de sa périphérie, et une surface qui comprend un biseau s'étendant vers l'avant et l'intérieur depuis une bordure de découpe périphérique proche selon un premier angle aigu d'orientation supérieur à environ 45° par rapport à l'axe longitudinal de l'élément de découpe, n'allant pas au-delà d'une profondeur spécifique. Le biseau peut être courbe ou plat, de dimension suffisante pour qu'un arasage résultant d'une usure à l'utilisation de l'élément de découpe reste à l'extérieur de la limite interne du biseau dans l'enveloppe du biseau, et de taille suffisamment petite pour maintenir des caractéristiques de découpe agressives propres à l'outil de coupe. Également, forets et outils de forage portant les éléments de découpe décrits.

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