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    • 8. 发明申请
    • Method and apparatus for acoustic detection of a fluid leak behind a casing of a borehole
    • 用于声学检测钻孔套管后面的流体泄漏的方法和装置
    • US20060133203A1
    • 2006-06-22
    • US10559090
    • 2004-05-12
    • Simon JamesPeter Fitzgerald
    • Simon JamesPeter Fitzgerald
    • G01V1/00
    • G01V1/50E21B47/101
    • An acoustic detection of a discrete acoustic signal allows to detect a leak behind a casing (23) of a borehole. An acoustic amplitude (AA) is sampled during a recording time period (24;64) at a determined position along the tube. Time intervals (26;66) are defined inside of the recording time period (24), and for each time interval (26) the measured acoustic amplitudes are processed to obtain respectively a corresponding power-frequency spectrum (261). A plurality of the power-frequency spectra are analyzed to identify the discrete acoustic signal by detecting time and frequency dependant changes of power. Preferably the processing involves a Fourier transform analysis. A power-frequency time plot is used to conveniently identify the discrete acoustic event.
    • 离散声学信号的声学检测允许检测钻孔的壳体(23)后面的泄漏。 在记录时间段(24; 64)期间,沿着管的确定位置采样声振幅(AA)。 时间间隔(26; 66)被定义在记录时间周期(24)内,并且对于每个时间间隔(26),处理测量的声振幅以分别获得对应的功率频谱(261)。 通过检测功率的时间和频率相关的变化来分析多个功率频谱以识别离散的声学信号。 优选地,处理涉及傅里叶变换分析。 功率频率时间图用于方便地识别离散声学事件。