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Keywords: drilling speed
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Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-041
... being noted with varying numbers of injection nozzles. The drilling speed of the water jet system is 1.7-2.0times faster than that of the rotary system. In case of the water jet system. the drilling speed is of wide range because the injection nozzles are very delicate beside the diamond or metal bits...

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