Propagation effects of low frequency electromagnetic waves in production well  

作　　者：Song Xijin Guo Baolong Dang Ruirong Wang Xuelong 

机构地区：[1]Institute of Intelligent Control and Image Engineering,Xidian University,Shaanxi 710071,China [2]Key Laboratory of Photoelectric Logging and Detecting of Oil and Gas,Ministry of Education,Xi'an Shiyou University,Shaanxi 710065,China [3]College of Computer Science&Technology,Shaanxi University of Technology,Shaanxi 710048,China

出　　处：《Petroleum Science》2012年第2期182-191,共10页石油科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50974103, No.61003196);the Specialized Research Plan of Shaanxi Province Education Department (No.2010JK787)

摘　　要：The frequency domain electromagnetic method has already been widely used for tomographic imaging or electromagnetic well logging. However, different from open hole logging, the metal casing existing in production well logging has a strong shielding effect on the electromagnetic waves, thus bringing some difficulties to the application of the frequency domain electromagnetic method in production well logging. According to the relation of the field source geometry to the ring around the mandrel, the general expressions of frequency domain electromagnetic responses in axially symmetrical layered conductive medium are deduced. The propagation effects caused by the low-frequency electromagnetic waves in cased hole are also analyzed. The distribution curves of eddy current density and magnetic flux density along the radial direction in the mandrel indicate that the eddy loss within the mandrel is proportional to the transmission signal frequency and the mandrel conductivity. The secondary field responses of different casing materials show that the transmission frequency has an important effect on the ability of electromagnetic waves penetrating the metal casing. The transmission frequency should be ultra-low in order to enable the electromagnetic signal to penetrate the casing easily. The numerical results of frequency responses for different casing physical parameters show that the casing thickness has a significant impact on the choice of the transmission frequency. It is also found that the effect of the casing radius on the transmission frequency can be neglected.The frequency domain electromagnetic method has already been widely used for tomographic imaging or electromagnetic well logging. However, different from open hole logging, the metal casing existing in production well logging has a strong shielding effect on the electromagnetic waves, thus bringing some difficulties to the application of the frequency domain electromagnetic method in production well logging. According to the relation of the field source geometry to the ring around the mandrel, the general expressions of frequency domain electromagnetic responses in axially symmetrical layered conductive medium are deduced. The propagation effects caused by the low-frequency electromagnetic waves in cased hole are also analyzed. The distribution curves of eddy current density and magnetic flux density along the radial direction in the mandrel indicate that the eddy loss within the mandrel is proportional to the transmission signal frequency and the mandrel conductivity. The secondary field responses of different casing materials show that the transmission frequency has an important effect on the ability of electromagnetic waves penetrating the metal casing. The transmission frequency should be ultra-low in order to enable the electromagnetic signal to penetrate the casing easily. The numerical results of frequency responses for different casing physical parameters show that the casing thickness has a significant impact on the choice of the transmission frequency. It is also found that the effect of the casing radius on the transmission frequency can be neglected.

关 键 词：Propagation effects eddy current density magnetic flux density production well frequency response 

分 类 号：P631.811[天文地球—地质矿产勘探] TN03[天文地球—地质学]