Rotary drill bits and method of use - Drilling & Service
I claim: 1. A rotary drill bit having a gauge region and for use in subsurface formations, comprising: a bit body; means defining a passageway within the body and adapted to carry a mud or like drilling fluid, and having an outlet opening at an external surface of the body; a single unbranched, continuous elongate channel extending from the outlet opening of the passageway and around the body ...
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