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    • 3. 发明授权
    • Through formation electromagnetic telemetry system and method for use of
the same
    • 通过形成电磁遥测系统及其使用方法
    • US6160492A
    • 2000-12-12
    • US118028
    • 1998-07-17
    • Paul I. Herman
    • Paul I. Herman
    • E21B47/12G01V3/00
    • E21B47/122
    • An electromagnetic telemetry system for changing the operational state of a downhole device (84) disclose. The system comprises an electromagnetic transmitter (76) disposed in a first wellbore (30) that transmits a command signal. An electromagnetic repeater (68) disposed in a second wellbore (38) receives the command signal and retransmits the command signal to an electromagnetic receiver (96) disposed in a third wellbore (46) that is remote from the first wellbore (30). The electromagnetic receiver (96) is operably connected to the downhole device (84) such that the command signal received from the electromagnetic repeater (68) is used to prompt the downhole device (84) to change operational states.
    • 用于改变井下装置(84)的操作状态的电磁遥测系统公开了。 该系统包括设置在第一井眼(30)中的电磁发射器(76),其传送命令信号。 设置在第二井筒(38)​​中的电磁中继器(68)接收命令信号并将命令信号重新发射到设置在远离第一井筒(30)的第三井眼(46)中的电磁接收器(96)。 电磁接收器(96)可操作地连接到井下装置(84),使得从电磁中继器(68)接收的命令信号用于提醒井下装置(84)改变操作状态。