... drilling rate optimum standoff distance drill bit cavitation erosion Abstract. A multitude of new jets such as pulsing jets, abrasive jets, cavitation jets and self-excited resonating cavitating jets have been investigated in the past decade. Self-resonating cavitating jets show the most...

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... demonstrated in the field tests because of these equipment problems. Thus, the process offers still more opportunity for greater drilling rate and bit life than has been achieved. The data show that the application of abrasive jet drilling may cut drilling costs substantially, especially in deep and hard rocks...

...A STUDY OF ROTARY DRILLING BY MEANS OF MEASURING THE TORQUE OF CONE BITS Abstract The torque of a rotating bit has a close relationship to the movement of teeth of the bit and to the drilling rate. Under loads of 500 - 9,000 kilograms with rotary speeds of 22 - 168 rpm, the torques of 29-in., 33411...