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    • 9. 发明申请
    • FILTERING ACOUSTIC WAVEFORMS IN DOWNHOLE ENVIRONMENTS
    • 在井下环境中滤波声波
    • US20120147702A1
    • 2012-06-14
    • US13310780
    • 2011-12-04
    • Henri-Pierre ValeroShinichi SunagaTakeshi Endo
    • Henri-Pierre ValeroShinichi SunagaTakeshi Endo
    • G01V1/40
    • G01V1/48G01V1/44G01V2210/23
    • Methods and apparatus to filter acoustic waveforms in downhole environments are described. An example method involves receiving acoustic waveform data representing acoustic signals traversing at least a portion of a borehole adjacent a subterranean formation and performing a direct transform operation on the acoustic waveform data to generate wavelet map data. The wavelet map data comprises a time-frequency representation of the acoustic waveform data. The example method also involves identifying a waveform of interest via the wavelet map data, extracting data associated with the waveform of interest from the wavelet map data, generating filtered wavelet map data based on the extracted data, and performing an inverse transform operation on the filtered wavelet map data to generate filtered acoustic waveform data
    • 描述了在井下环境中滤波声波的方法和装置。 示例性方法包括接收表示穿过邻近地层的钻孔的至少一部分的声信号的声波形数据,并且对声波形数据执行直接变换操作以产生小波图数据。 小波图数据包括声波形数据的时间 - 频率表示。 该示例方法还涉及通过小波变换图数据识别感兴趣的波形,从小波变换数据中提取与感兴趣波形相关联的数据,基于所提取的数据产生滤波后的小波变换数据,并对经滤波的 小波图数据生成滤波后的声波形数据