| 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) asfunctions of radial axial tangential accelerations.
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