| 基于小波变换的套管金属磁记忆检测信号处理 |
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| 引用本文： | 张军,王彪,计秉玉.基于小波变换的套管金属磁记忆检测信号处理[J].石油学报,2006,27(2):137-140. |
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| 作者姓名： | 张军 王彪 计秉玉 |
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| 作者单位： | 1. 哈尔滨工业大学航天学院, 黑龙江, 哈尔滨, 150001;2. 大庆油田有限责任公司, 黑龙江大庆, 163453 |
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| 摘 要： | 套管受到非均匀载荷的作用易产生塑性变形,在应力集中区,易造成套管弯曲、变形或错断,用金属磁记忆技术可有效判断套管应力集中区域.对于含有噪声非平稳性的井下磁记忆信号,把指数小波去噪技术和希尔伯特(Hilbert)变换应用到了磁记忆的信号分析中.基于信号与噪声在小波分析中不同尺度的传播特性,利用小波非线性滤波方法消除了噪声、提高了信噪比.同时利用Hilbert变换得到磁记忆信号的包络线,从而有效提取了特征量.
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| 关 键 词： | 套管损害 应力集中 金属磁记忆技术 小波分析法 信号分析 |
| 文章编号： | 0253-2697（2006）02-0137-04 |
| 收稿时间： | 2005-07-04 |
| 修稿时间： | 2005-08-26 |
Signal processing for metal magnetic memory testing of borehole casing based on wavelet transform |
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| Zhang Jun,Wang Biao,Ji Bingyu.Signal processing for metal magnetic memory testing of borehole casing based on wavelet transform[J].Acta Petrolei Sinica,2006,27(2):137-140. |
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| Authors: | Zhang Jun Wang Biao Ji Bingyu |
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| Affiliation: | 1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China;2. Daqing Oilfiled Company Limited, Daqing 163453, China |
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| Abstract: | The stress concentration in the imbalanced section of plastically imbalanced casing resulted from uniform load can easily make the casing bending, deforming or breaking out. The metal magnetic memory technique is an effective method for searching the stress concentration zone. For analyzing the unsteady leakage magnetic signals containing noise, the wavelet exponential denoising method and Hilbert transformation were applied to signal analysis of metal magnetic memory. As a result, the available signal can be reserved, and the characteristic quantity of magnetic signals can be obtained. |
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| Keywords: | casing damage stress concentration metal magnetic memory technique wavelet analysis signal analysis |
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