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    • 2. 发明授权
    • Method for calibrating current and magnetic fields across a drill collar
    • 校准钻铤上的电流和磁场的方法
    • US09360581B2
    • 2016-06-07
    • US13128506
    • 2009-11-17
    • Brian ClarkMark E. FlaumJan MorleyJaideva GoswamiMiguel F. Pabon
    • Brian ClarkMark E. FlaumJan MorleyJaideva GoswamiMiguel F. Pabon
    • G01V3/08G01V3/26E21B47/024
    • G01V3/26E21B47/024
    • A method for drilling a well includes applying a current across a drill collar that surrounds an internal magnetometer. The current travels across the drill collar and along one or more other current paths to return to the drill collar. The method also includes using the magnetometer to measure magnetic fields due to the current being applied across the drill collar and the current across one or more other current paths while the drill collar is disposed at a first angle of rotation and rotating the drill collar to a second angle of rotation. The method further includes measuring the magnetic fields using the internal magnetometer while the drill collar is disposed at the second angle of rotation and determining a relationship between the current across the drill collar and a portion of the magnetic fields due to the current across the drill collar measurable by the internal magnetometer.
    • 用于钻井的方法包括在围绕内部磁力计的钻铤上施加电流。 电流穿过钻铤并且沿着一个或多个其它电流路径行进以返回钻铤。 该方法还包括使用磁力计来测量磁场,这是因为电流被施加在钻铤上的电流和跨过一个或多个其它电流路径的电流,同时钻铤设置在第一旋转角度并将钻铤旋转到 第二个旋转角度。 该方法还包括使用内部磁力计测量磁场,同时钻铤以第二旋转角度设置,并且确定由于穿过钻铤的电流而导致钻铤和电场的一部分之间的电流之间的关系 可由内部磁力计测量。