Drill bit

Details Drill bit Drill bit

E - Fixed Constructions

21

B

E21B 10/00 (2006.01) E21B 10/48 (2006.01)

Patent

CA 2056049

A rotatable crown for a rotary drill bit comprises a working end which presents a working face for the crown and an opposite end for engagement with a drill rod, stringer or adaptor coupling. The working end comprises a mass of discrete abrasive particles uniformly distributed through a bonding matrix, and a plurality of elongate abrasive elements so arranged in the matrix that ends thereof are located in the working face. The working face has a serrated profile with alternating peaks and troughs. The ends of the elongate elements are located in peaks.

Couronne de forage pour foreuse rotative comportant une extrémité de travail et une extrémité pour accouplement à une tige de forage, à un longeron-support ou à un accouplement adaptateur. L'extrémité de travail comporte une masse de particules abrasives discrètes distribuées uniformément à travers une matrice de liaisonnement et une pluralité d'éléments abrasifs de forme allongée disposés dans la matrice de manière à ce que leurs extrémités se prolongent jusqu'à la surface de travail. La surface de travail présente un profil dentelé avec alternance de crêtes et de sillons. Les extrémités des éléments de forme allongée correspondent aux crêtes.

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