| 摘要 |
A diamond impregnated bit crown has blades formed thereon. Flow channels are formed between the blades, the flow channels 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 that has a greater width than a portion of the channel immediately outward from the enlarged width area. A nozzle is releasably secured in each of the enlarged width areas for discharging drilling fluid.
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