Drill bits embodying diamond impregnated segments

Details Drill bits embodying diamond impregnated segments Drill bits embodying diamond impregnated segments

E - Fixed Constructions

21

B

255/69

E21B 10/46 (2006.01) E21B 10/56 (2006.01)

Patent

CA 1116161

ABSTRACT OF THE DISCLOSURE A rotary bit for drilling bore holes in earth formations comprising a body, a hard metal matrix secured to the body and providing a face adapted to confront the bottom portion of the bore hole is disclosed. The matrix has preformed cavities therein opening through the face, preformed diamond impregnated cutters in the cavities and projecting from the face to drill the bottom portion of the hole upon rotation of the bit, and means securing the preformed cutters to the walls of the preformed cavities. Hard metal supports extend outwardly beyond the face in thrust transmitting relation to the trailing sides of the cutters, with the matrix having supplementary cavities continuing from the first mentioned cavities. The supports are separate members disposed in the supplementary cavities in thrust transmitting relation to the trailing sides of the cutters. This drill bit allows substantially increased penetration rates as well as an increase in the length of the hole drilled.

372807

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