煤矿井下随钻电阻率测量模型参数

为了得到最适用于煤矿井下孔内电阻率测量工况的各工程参数,实现孔内电阻率精准测量,对孔内电阻率测量常用的对称四级测量模型展开了研究,推导了电阻率探测深度与最佳电极间距之间的理论关系,得到了220 mm的最佳电极距,随后分析了正弦交流激励电流作为电极激励电流的优势,并选取了最佳电极供电方式及最佳电极材料,从而使对称四极测量模型的各工程参数具备更好的工况适用性。

Model parameters of resistivity measurement while drilling in coal mine

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.