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...