| 摘要 |
A drill bit comprising a body intermediate a threaded shank and a working face with the working face comprising a plurality of blades converging towards a center of the working face and diverging towards a gauge of the working face. Junk slots comprising a base are formed by the plurality of blades. At least one blade comprising at least one cutting surface with a carbide substrate is bonded to a diamond working end. At least one high pressure nozzle is disposed between at least two blades in nozzle bore formed in an elevated surface formed from the base of the junk slots. The elevated surface is disposed adjacent the diamond working end of the least one blade.
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