电磁流动成像测井频率特性分析  

ANALYSIS ON FREQUENCY PROPERTY IN ELECTROMAGNETIC FLOW IMAGING WELL LOGGING

作　　者：王晓星[1] 吴锡令[1] 

机构地区：[1]中国石油大学资源与信息学院,北京昌平102249

出　　处：《西南石油大学学报（自然科学版）》2009年第4期38-41,共4页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金项目(60472019)

摘　　要：电磁流动成像测井基于油气水导电和介电特性差异测量并重建流体流动的截面图像,其交流激励信号的工作频率对测量的影响主要体现在对混合流体电性(包括电导率和介电常数)以及测量值两个方面。通过理论研究和数值模拟,对频率选取进行讨论。分析及计算结果表明,根据流型不同,测量频率选择应略有差异,但基本集中在10kHz～10MHz,此时油气水混合流体的各相电性参数保持稳定且差别大,同时各电极模拟测量值基本保持稳定,实部及虚部均差别明显,传感器可以获得最高灵敏度。频率特性分析为实际测量优选交流信号频率提供依据。Flow Electromagnetic Tomography is based on the electrical property differences between oil,gas and water to scan,inverse and show the distribution and condition of multiphase flow.The influence of frequency on it is presented in two ways,electrical properties(conductance and capacitance) and measured values.Through theory and numerical simulation,the discussion on how to choose a proper frequency of the alternating signal is made.The results show that the frequency should be changed according to flow types,when it is between 10 kHz and 10 MHz,the electrical properties of oil,gas and water can keep steady with remarkable difference.At the same time,both the real parts and the imaginary components of measured valued for every pole are steady with great differences.Hence,the sensors can obtain the highest sensibility.The analysis provides an effective basis for choosing optimal frequency during the actual measurement.

关 键 词：多相流 成像测井 频率特性 电性参数 模拟测量值 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]