A METHOD FOR ENERGY EFFICIENT AND FAST ROTARY DRILLING IN INHOMOGENEOUS AND/OR HARD ROCK FORMATIONS
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United States of America Patent
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Nov 10, 2016
app pub date -
Jan 13, 2015
filing date -
Jan 13, 2014
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Abstract
It is described a rotary drilling system (10) for drilling a borehole (12) in inhomogeneous and/or hard rock formations. The system (10) comprising: a rotary drill bit (20; 50), and at least two electrodes (21, 22, 23, 51, 52, 53) arranged for pulsing between said electrodes of at least one high voltage electro pulse (41), wherein said at least one high voltage electro pulse (41) is generated in response to a detected resistance on the drill bit (20) from a rock formation (40) in front of the drill bit (20) while rotating, in order to create small/micro-cracks (45) in the rock formation (40).
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