Hydropulses increase drilling penetration rates

Jack Kollé Mark Marvin Tempress Technologies Inc. Kent, Wash. Tempress Technologies Inc. developed this prototype pulsation device to test flow rates and drilling properties (Fig. 3). This 20% back-rake cutter bit drilled two samples of Mancos Shale (Fig. 9). [19,264 bytes] Intense suction-pressure pulses (hydropulses), utilizing a small-scale cycling valve, resulted in increased drilling-penetration rates for test samples of Mancos Shale and Colton Sandstone. Confining pressure exerted by the mud column in the borehole serves to slow conventional rotary systems because bottom-hole pressures...

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