Fundamental relationships of the parameters; penetration rate, bit weight, rotary speed, bit horsepowers, flow rate, and pressure were developed using eight full-scale, oilfield diamond drilling bits under laboratory-controlled conditions. One thousand five hundred data points, with all the parameters, were analyzed with 642 plots and 131 multiple-regression analyses. The hydraulic lift under the diamond bit has been accounted for in order to obtain relationships of mechanical bit weight with torque and penetration.

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