IMPREGNATED BIT WITH CHANGEABLE HYDRAULIC NOZZLES

摘要

A diamond impregnated bit crown(ll) has blades (17) formed thereon. Flow channels are formed between the blades, the flow channels (19) having inner and outer ends and extending outward to a gage surface of the crown. At least some of the flow channels have an enlarged width area (23) that has a greater width than a portion of the channel immediately outward from the enlarged width area. A nozzle (29) is releasably secured in each of the enlarged width areas for discharging drilling fluid.