... settling of cuttings in the hole, and well caving in slow down the rate of penetration on certain drilling intervals. Eventually, all this points to the fact that the drilling technique applied is not effi ient. Thisincludes issues related to operation of rock cutting tools, hole cleaning and drilling mud parameters. Сonclusions Evaluation of geological and drilling conditions, drilling problems and failures, as well as their correlation with achieved volumetric soil cutting rate (Tab. 2) [2] and rate ...

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