METHOD AND APPARATUS FOR CONTROLLING THE HEAD OF A DRILLING OR CORE-DRILLING DEVICE

摘要

Electrodes (2) are provided in a drill bit (1), or alternatively, in a coring bit, to measure variations in formation resistivity (R) surrounding an earth borehole. Three orthogonal accelerometers (4A, 4B, 4C) are also provided in the drill bit (1), or in the coring bit, to monitor the dynamic behavior of the bit (1) as functions of radial, axial and tangential accelerations.