Model parameters of resistivity measurement while drilling in coal mine

Abstract

In order to obtain the most suitable engineering parameters for the resistivity measurement while drilling in coal mine, and achieve the accurate measurement, the measurement model of the symmetric four-stage device commonly used in the resistivity measurement probe is studied. The paper derives theoretical relationship between the resistivity detection depth and the optimal electrode spacing, and obtains the optimal electrode distance of 220 mm under the condition of the intra-hole resistivity measurement, then analyzes the advantage of the sinusoidal AC excitation current as the electrode excitation current, and selects the best electrode power supply mode and the best electrode material, so that the engineering parameters of the symmetrical quadrupole device measurement model have better applicability.

Keywords

• measurement resistivity while drilling
• symmetrical four-stage device
• electrode spacing
• excitation current
• electrode material