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 1116592

ABSTRACT OF THE DISCLOSURE A rotary drill 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 generally radial preformed grooves therein opening through the face and extending to an outer gage portion of the matrix. Preformed diamond impregnated cutter segments in the grooves extend to the outer gage portion and project from the face to drill the bottom portion of the hole upon rotation of th bit. Means securing the cutter segments to the walls of the preformed grooves are provided and the segments are spaced from each other to provide fluid courses therebetween extending to the outer gage portions. The body has passage means therein and means for conducting fluid from the passage means to the fluid courses to remove cutting formed by the segments from the bottom region of the bore hole. The preformed grooves extend to an inner gage portion of the matrix and the inner portions of the segments terminate at the inner gage portions. The conducting means includes passages in the inner gage portion leading to the fluid courses.

372808

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