声电测井探测器主要干扰成因分析  

Analysis of the Main Interference Causes of Acoustoelectric Logging Detector

作　　者：陈宏志 卢俊强[1,2] 鞠晓东 门百永[1,2] 乔文孝 CHEN Hongzhi;LU Junqiang;JU Xiaodong;MEN Baiyong;QIAO Wenxiao(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Key Laboratory of Earth Prospecting and Information Technology,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]北京市地球探测与信息技术重点实验室,北京102249

出　　处：《测井技术》2023年第2期217-223,共7页Well Logging Technology

基　　金：国家自然科学基金“井下声电效应测井探测器电磁兼容特性研究”(42174218)。

摘　　要：声波类测井仪器通常有数千伏的激励高压,高压脉冲形成的电磁干扰可影响测井仪器的功能部件和正常测量,降低信噪比。由于声电测井探测器采集的声电转换波信号极其微弱,易受电磁干扰,这就决定了声电测井探测器对电磁兼容性有更高的要求。结合探测器的结构和电磁兼容三要素研究了声电测井探测器的电磁干扰特性。分析了作为敏感源的电极测量回路特征,通过干扰测试明确了高压脉冲源是主要干扰源,并分析了电磁干扰耦合路径的形成机理。以定性的电耦合模型、定量的高斯电场定律和电耦合实验研究相结合的方式对探测器的电磁干扰特性进行系统分析与验证,还原探测器的主要干扰特征,揭示高压脉冲的电耦合是探测器的主要干扰成因,并提出减小耦合干扰的方法。测试结果表明,该方法能够有效改善声电测井仪器的电磁兼容特性,提高对声电转换波弱信号的探测能力。Acoustic-type logging instruments generate high voltages in the order of thousands of volts.Electromagnetic interferences are thus induced by high-voltage pulses that affect the logging tool and make it inoperable owing to damaged components in severe cases.In particular,weak acoustoelectric signals,vulnerability to electro magnetic interference,and other characteristics require higher electro magnetic compatibility of the acoustoelectric logging detector.The system’s complexity makes it difficult to find and analyze the root cause of the interference.This paper revolves around the three elements of electromagnetic compatibility.The electrode measurement circuit is a sensitive source.Through interference analysis and testing,the high voltage pulse source is determined to be the source of interference.We focus on analyzing the formation mechanism of electromagnetic interference coupling paths.The electromagnetic interference characteristics of the detector are systematically analyzed and verified by combining the qualitative electric coupling mechanism,the quantitative Gaussian electric field law and the electric coupling experimental study.This paper reduces the main interference causes and characteristics of the detector and reveals that the electrical coupling of high voltage pulses is the main interference cause of the acoustoelectric logging detector.The method to eliminate the coupling path is proposed.

关 键 词：声电测井 测井仪器 高压脉冲 电磁干扰 电耦合 

分 类 号：P631.84[天文地球—地质矿产勘探]