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    • 2. 发明授权
    • Method and apparatus for detecting impending sticking of a drillstring
    • 用于检测钻柱即将粘附的方法和装置
    • US5448911A
    • 1995-09-12
    • US19402
    • 1993-02-18
    • John S. Mason
    • John S. Mason
    • E21B31/03E21B44/00E21B47/00
    • E21B31/03E21B44/00E21B47/0006
    • The present invention is directed to a method and apparatus for determining that a drillstring in a wellbore is susceptible to sticking against a wellbore surface. When characterized as a method, the method steps include (1) monitoring a vibration characteristic of the drillstring during drilling operations, and (2) comparing the vibration characteristic with at least one prior vibration characteristic to identify impending sticking. In the preferred embodiment, vibration amplitude is monitored to detect amplitude diminishment which is indicative of impending pipe sticking. Preferably, vibration data is subjected to a stabilizing signal processing operation which minimizes the adverse impact of noise and normalizes the data to facilitate comparison with prior time periods. Preferably, the data is presented and displayed in a time-domain format to allow visual comparison over a selected time interval.
    • 本发明涉及一种用于确定井眼中的钻柱易于粘附在井筒表面上的方法和装置。 当以方法为特征时,方法步骤包括(1)在钻井操作期间监测钻柱的振动特性,以及(2)将振动特性与至少一个先前的振动特性进行比较以识别即将发生的粘着。 在优选实施例中,监测振动幅度以检测指示即将出现的管道粘连的振幅减小。 优选地,振动数据经受稳定信号处理操作,其使噪声的不利影响最小化并使数据标准化以便于与先前时间段进行比较。 优选地,以时域格式呈现和显示数据,以允许在所选择的时间间隔内进行视觉比较。