基于同态法子波提取的管道泄漏定位研究
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摘要
根据应力波传播理论,可以利用反射波对管道进行损伤检测。由于地震的褶积模型与管道受激后产生的应力波的传播模型类似,因此采用地震反褶积技术进行管道损伤检测。对反射波进行了统计性反褶积方面的研究,由于统计性反褶积没有利用子波特性,直接对记录数据进行估计,并且它还假设反射系数是随机白噪,使得统计性反褶积方法在管道损伤检测中的运用受到限制。本文采用确定性反褶积方法,利用同态法技术提取子波,然后利用提取的子波进行子波反褶积计算,从而抛弃反射系数为随机白噪的假设,而且克服了统计性反褶积中忽略子波的这一缺点,通过模拟数据与实际资料验证,该方法减小了管道损伤定位误差。
According to the stress wave propagation theory, the damage detection of the pipeline can be performed by using the reflected wave. Since the convolution model of the earthquake is similar to the propagation model of the stress wave generated after the pipeline was excited, the seismic deconvolution technique is used to detect the pipeline damage. Since that the statistical deconvolution did not utilize the wavelet characteristics, that the recorded data was directly estimated, and that it also assumed that the reflection coefficient is random white noise, in the study of the statistical deconvolution of the reflected wave, it makes statistical deconvolution on the application of the product method in pipeline damage detection limited. In this paper, the deterministic deconvolution method is used to extract the wavelets by the homomorphic method, and then the extracted wavelets are used to calculate the wavelet deconvolution, thereby abandoning the assumption that the reflection coefficient is random white noise, and overcoming that this shortcoming of the wavelet is ignored in the product with the statistical deconvolution. It is verified by the simulation data and the actual data that the method reduces the pipeline damage positioning error.
According to the stress wave propagation theory, the damage detection of the pipeline can be performed by using the reflected wave. Since the convolution model of the earthquake is similar to the propagation model of the stress wave generated after the pipeline was excited, the seismic deconvolution technique is used to detect the pipeline damage. Since that the statistical deconvolution did not utilize the wavelet characteristics, that the recorded data was directly estimated, and that it also assumed that the reflection coefficient is random white noise, in the study of the statistical deconvolution of the reflected wave, it makes statistical deconvolution on the application of the product method in pipeline damage detection limited. In this paper, the deterministic deconvolution method is used to extract the wavelets by the homomorphic method, and then the extracted wavelets are used to calculate the wavelet deconvolution, thereby abandoning the assumption that the reflection coefficient is random white noise, and overcoming that this shortcoming of the wavelet is ignored in the product with the statistical deconvolution. It is verified by the simulation data and the actual data that the method reduces the pipeline damage positioning error.
引文
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[3]龚建人.在同态法基础上利用合成和迭代技术求取地震子波[J].石油物探,1983(03):81-88.
[4]黄绪德.反褶积与地震道反演[M].北京:石油工业出版社,1992:3-11.
[5]王君,周兴元,曹孟起.同态反褶积的改进与应用[J].石油地球物理勘探,2003(S1):27-30+138.
[6]王蓉蓉,戴永寿,李闯,等.基于奇异值分解的时变子波提取准确性评价方法[J].石油物探,2015,54(05):531-540.
[7]Levy S, Oldenburg D W. Automatic phase correction of common-midpoint stacked data[J]. Geophysics, 1987, 52(1):51~59
[8]Levy S, Oldenburg D W. The deconvolution of phase shifted wavelets[J]. Geophysics, 1982,47(9):1285~1294
[9]耿艳峰,王丹,华陈权.基于反褶积与编码激励的长输管道损伤检测[J].振动.测试与诊断,2014,34(01):130-135+194.