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| 金属套管对多分量井间电磁响应的影响 |
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魏宝君1,李晓强2,任广强1,贾毅龙1,吴康康1,党峰3,刘福平4
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(1.中国石油大学(华东)理学院,山东青岛 266580;2.中国石油集团测井有限公司吐哈分公司,新疆鄯善 838200;3.中国石油集团测井有限公司,陕西西安 710077;4.北京印刷学院,北京 102600)
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| 摘要: |
| 采用柱状成层各向异性介质中并矢Green函数的解析式模拟当发射井含金属套管时多分量井间电磁场的响应,并系统分析金属套管对井间电磁信号不同分量的影响规律。计算结果表明,金属套管的存在导致井间电磁信号所有分量的幅度衰减和相位延迟。在固定套管参数和发射频率的前提下,不同分量的幅度衰减与相位延迟分别具有相同的数值且保持恒定,与线圈系位置和地层电导率无关。频率越高,套管厚度越大,套管磁导率和电导率越大,金属套管导致的幅度衰减和相位延迟越明显。针对发射井、接收井单井或均含有金属套管的情况,在对井间电磁测量数据进行反演时采用该解析方法即可事先消除金属套管的影响。 |
| 关键词: 井间电磁响应 金属套管 多分量 并矢Green函数 |
| DOI：10.3969/j.issn.1673-5005.2018.05.007 |
| 分类号::P 631.9 |
| 文献标识码:A |
| 基金项目:国家科技重大专项(2017ZX05019-006)；中央高校基本科研业务费专项(15CX05047A) |
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| Effects of metal casing on multi-component cross-hole electromagnetic responses |
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WEI Baojun1, LI Xiaoqiang2, REN Guangqiang1, JIA Yilong1, WU Kangkang1, DANG Feng3, LIU Fuping4
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(1.College of Science in China University of Petroleum(East China), Qingdao 266580, China;2.Tuha Branch, China Petroleum Logging Company Limited, Shanshan 838200, China;3.China Petroleum Logging Company Limited, Xi 'an 710077, China;4. Beijing Institute of Graphic Communication, Beijing 102600, China)
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| Abstract: |
| The multi-component cross-hole electromagnetic field 's responses were simulated using an analytical expression of dyadic Green 's functions in cylindrically stratified anisotropic media.With the transmitter borehole encased with a metal casing, the effects of metal casing on different components of cross-hole electromagnetic signals were analyzed systematically.The results show that the existence of metal casing will lead to amplitude attenuation and phase delay for all components of cross-hole electromagnetic signals. Under the condition of fixed casing parameters and frequency,the amplitude attenuation and the phase delay variations remain constant for different components, the coil position and the formation 's conductivity. The amplitude attenuation and phase delay caused by the metal casing become more obvious for higher frequency, larger casing thickness and larger casing permeability and conductivity. In the case that the transmitter borehole and/or the receiver borehole are encased with metal casing, the effects of metal casing can be corrected by this analytical method before inverting the cross-hole electromagnetic measurements. |
| Key words: cross-hole electromagnetic responses metal casing multi-component dyadic Green 's functions |
