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    • 8. 发明申请
    • Downhole Resistivity Receiver with Canceling Element
    • 具有取消元件的井下电阻率接收器
    • US20100295547A1
    • 2010-11-25
    • US12846348
    • 2010-07-29
    • David R. HallHarold Snyder
    • David R. HallHarold Snyder
    • G01V3/18
    • G01V3/28
    • A downhole tool assembly comprising at least one downhole tool string component. The downhole tool string component comprises at least one transmitter. The transmitter is attached to a primary signal generator and transmits a primary signal into the surrounding earth formation. The primary signal creates an induced or reflected signal within the formation which may reveal information regarding the formation. The downhole tool string component also comprises at least one receiver. The receiver is adapted to measure the signal induced or reflected in the formation. The downhole tool sting component also comprises at least one active coil or piezoelectric transducer proximate the receiver. The active coil or piezoelectric transducer is adapted to substantially cancel the primary signal generated by the transmitter and allow the receiver to focus on the induced or reflected signal.
    • 一种井下工具组件,其包括至少一个井下工具组件。 井下工具串组件包括至少一个发射器。 发射机连接到主信号发生器,并将主信号发送到周围的地层中。 主要信号在地层内产生一个感应或反射的信号,这些信号可以揭示有关地层的信息。 井下工具串组件还包括至少一个接收器。 接收器适于测量在地层中感应或反射的信号。 井下工具刺部件还包括靠近接收器的至少一个有源线圈或压电换能器。 有源线圈或压电换能器适于基本上消除由发射器产生的主信号,并允许接收机聚焦于感应或反射的信号。