一种射孔信号衰减系数计算方法
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摘要
振动波衰减系数是正演射孔信号评估射孔质量的重要参数之一,本文基于振动力学的冲击衰减振荡模型,提出了一种基于包络检波的射孔振动信号衰减系数计算方法。根据射孔振动信号的特点,设计了不同参数Butterworth带通滤波器处理射孔信号,以减小噪声对衰减系数计算的影响。研究结果表明:在适当的滤波参数条件下,套管中振动衰减系数最小相对误差可达6.56%。
Vibration attenuation coefficient is one of the important parameters for evaluating perforation quality by forward perforation signal. A new calculation method of perforation vibration wave attenuation coefficient is put forward based on the impact attenuation oscillation model of vibration mechanics. According to the characteristics of perforating vibration wave and its noise,the Butterworth band-pass filters with different parameters are designed and they are used for processing these signals to decrease the influence of the noise on the attenuation coefficient calculation. The research result shows that the minimum relative error of casing vibration attenuation coefficient can reach to 6. 56% under appropriate filter parameters.
Vibration attenuation coefficient is one of the important parameters for evaluating perforation quality by forward perforation signal. A new calculation method of perforation vibration wave attenuation coefficient is put forward based on the impact attenuation oscillation model of vibration mechanics. According to the characteristics of perforating vibration wave and its noise,the Butterworth band-pass filters with different parameters are designed and they are used for processing these signals to decrease the influence of the noise on the attenuation coefficient calculation. The research result shows that the minimum relative error of casing vibration attenuation coefficient can reach to 6. 56% under appropriate filter parameters.
引文
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[5]张丹.爆源因素对爆破地震强度分布特征的影响研究[D].成都:西南交通大学,2008.
[6]张义平,吴桂义.爆破地震波特性研究[J].矿业研究与开发,2007,27(6):68-72.ZHANG Yi-ping,WU Gui-yi.Study on characteristics of blasting-caused seismic wave[J].Mining Research and Development,2007,27(6):68-72.
[7]王典,刘财,刘洋,等.反射法地震勘探噪声消除技术研究[J].地球物理学进展,2006,21(3):957-970.WANG Dian,LIU Cai,LIU Yang,et al.Study of the noise elimination methods in the reflection seismic exploration[J].Progress in Geophysics,2006,21(3):957-970.
[8]Cosma C,Enescu N.Characterization of fractured rock in the vicinity of tunnels by the swept impact seismic technique[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(6):815-821.
[9]王敬华.地震波衰减参数提取方法研究与应用[D].成都:成都理工大学,2010.
[10]Cousin C A,Jeffrey.Digital analysis of explosion wave propagation[J].Quart Colorado School of Mines,1997,122(5):177.
[11]张廷尉,陈红,王磊.基于Matlab的巴特沃斯数字低通滤波器的设计[J].鞍山师范学院学报,2012,14(2):13-15.ZHANG Ting-wei,CHEN Hong,WANG Lei.Design of digital Butterworth low-pass filter based on Matlab[J].Journal of Anshan Teachers College,2012,14(2):13-15.
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