Rotary drill bits

Details Rotary drill bits Rotary drill bits

E - Fixed Constructions

21

B

255/69

E21B 10/60 (2006.01) E21B 10/42 (2006.01)

Patent

CA 1217475

ABSTRACT OF THE DISCLOSURE: A rotary bit for use in subsurface formations comprises a bit body having a central bore, the body having a leading face and a trailing gauge region, walls on the bit dividing the face into fluid channels, cutting elements being present on some of the walls, and passage- ways connecting the bore to openings in the fluid channels. Two wall portions are arranged relative to each opening so that the fluid emerging from the opening is directed to travel first inwardly towards the central axis of the bit before travelling outwardly to the gauge region.

436741

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