Influence of steel casings on electromagnetic signals
Influence of steel casings on electromagnetic signals
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DOI：
10.1190/1.1443600
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发表时间：
1994-03
期刊：
影响因子：
3.3
通讯作者：
Xuxiang Wu;T. Habashy
中科院分区：
文献类型：
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作者：
Xuxiang Wu;T. Habashy
油田的大多数威尔斯井都是金属套管。通过这种钢套管威尔斯井测量低频磁场的可行性对于监测生产过程中的流体运动非常重要。我们报告的实验和建模结果的影响，钢套管上通过它们传输的电磁信号。这种效应包括通过套管壁扩散的信号的衰减和相移。样品套管下的线性制度，套管的电性能是独立的所施加的信号的低场强进行了研究。测量了从0.1 Hz到1 kHz的横向电场和横向磁场极化的频谱。为模拟套管响应而开发的数值模型与实验数据非常吻合。最后，对地磁场和套管剩磁效应的研究表明，这些稳态偏置不影响交流信号的检测。
Most wells in oil fields are cased with metal. The feasibility of measuring low‐frequency magnetic fields through such steel‐cased wells is of great interest for monitoring fluid movement during production. We report on experimental and modeling results regarding the effect of steel casing on electromagnetic signals transmitted through them. This effect includes the attenuation and phase shift of a signal diffusing through the casing wall. Sample casings are studied under low field strength in the linear regime where the casing's electrical properties are independent of the applied signals. Frequency spectra are measured for transverse‐electric and transverse‐magnetic polarizations from 0.1 Hz to 1 kHz. Numerical models, developed to simulate the casing response, match the experimental data very well. Finally, studies of the effects of the earth’s magnetic field and casing remanent magnetization show that these steady biases do not affect the ac signal detection.