Hydropulses increase drilling penetration rates

03/29/1999
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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