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    • 2. 发明授权
    • Downlink telemetry system
    • 下行遥测系统
    • US06920085B2
    • 2005-07-19
    • US09783158
    • 2001-02-14
    • Michael Dewayne FinkeDoyle Raymond Warren, IICili SunBipin Kumar Pillai
    • Michael Dewayne FinkeDoyle Raymond Warren, IICili SunBipin Kumar Pillai
    • E21B47/18H04H60/31H04H9/00
    • E21B47/185
    • A downlink telemetry system providing improved apparatus and methods for communicating instructions via pressure pulses from surface equipment to a downhole assembly. The apparatus comprises a surface transmitter for generating pressure pulses, a control system, and a downhole receiver for receiving and decoding pulses.In operation, a bypass valve is opened and closed to create a series of pressure pulses received and decoded by a downhole receiver. The method significantly reduces the time required for downlink communication without interrupting drilling and without interrupting uplink communications such that simultaneous, bi-directional communication is achievable if the uplink and downlink signals are sent at different frequencies.The telemetry scheme and algorithm provide an inventive method for filtering and decoding the downlink signals. The algorithm determines the time intervals between pulse peaks and decodes the intervals into an instruction. The algorithm also includes error checking for verifying that the instruction was properly received downhole.
    • 一种下行链路遥测系统,其提供改进的装置和方法,用于经由来自地面设备的压力脉冲向井下组件通信指令。 该装置包括用于产生压力脉冲的表面发射器,用于接收和解码脉冲的控制系统和井下接收器。 在操作中,旁通阀被打开和关闭以产生由井下接收器接收和解码的一系列压力脉冲。 该方法显着地减少下行链路通信所需的时间,而不会中断钻孔,而不会中断上行链路通信,以便如果以不同的频率发送上行链路和下行链路信号,则可以实现同时的双向通信。 遥测方案和算法提供了用于对下行链路信号进行滤波和解码的创新方法。 该算法确定脉冲峰值之间的时间间隔,并将间隔解码为指令。 该算法还包括用于验证指令是否正确接收到井下的错误检查。