含金属心棒阵列感应测井仪器的井眼校正.pdfVIP

石油大学学报990306 石油大学学报 JOURNAL OF THE UNIVERSITY OF PETROLEUM,CHINA 1999年 第23卷 第3期 vol.23No.3 1999 含金属心棒阵列感应测井仪器的井眼校正 魏宝君　　张庚骥 摘要：对含金属心棒阵列感应测井仪器的线圈系模型在含井眼地层中的响应及该模型的仪器常 数刻度值进行了计算，计算中同时考虑了线圈系的有限尺寸。给出了含复宗量变型Bessel函数 无穷限振荡积分的数值计算方法和含金属心棒线圈系的井眼校正图版。计算结果表明，金属心 棒对输出信号的影响是恒定的，含铜心单元阵列的井眼校正曲线保持了原曲线的主要特性，泥 浆对不同单元阵列输出信号的影响程度是不同的。 关键词：感应测井仪器；金属心棒；仪器常数；井眼；校正 中图分类号：P 631.9　　　文献标识码：A BOREHOLE CORRECTION FOR ARRAY INDUCTION LOGGING TOOL WITH METAL MANDREL Wei Baojun and Zhang Gengji// 1999,23(3):22～26 The response in media of formation with borehole and the calibrating value of the tool factor of array induction logging coils model with metal mandrel are calculated. The finite size of the coils is considered during the calculation. The mathematical method for calculating the infinite oscillating integration with complex argument modified Bessel functions is discussed. The borehole correction charts of the coils with metal mandrel are given. The results indicate that the influence of the metal mandrel on output signals is stable. The borehole correction curves of the array with copper tubing keep the main characteristics of the old curves, and the mud has different influence on output signals of different arrays. Key words: induction logging tool; metal mandrel; tool factor; borehole; correction About the first author: Wei Baojun, male, lecturer, obtained MS degree from the University of Petroleum in 1997. Now he works on the theory physics and the theory of electrical logging at the Department of Applied Physics in the University of Petroleum, China (Dongying: 257062). 引　言 　　在阵列感应测井仪器线圈系的结构设计中采用金属心棒，与使用传统的绝缘心棒相比具有 许多优点。但是，金属心棒的存在使线圈系在真空中的信号输出不为零，从而产生了不可忽略 的系统误差。另外，线圈系中金属心棒的存在改变了仪器的原来构造，需重新考查仪器对地层 电性信息的反应特性。本文给出的阵列感应测井仪器单元阵列模型含