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公开(公告)号：US06657597B2
公开(公告)日：2003-12-02
申请号：US09923205
申请日：2001-08-06
IPC分类号： G01V100
CPC分类号： G01V11/002 , E21B47/122 , H01Q1/04 , H01Q3/2611
摘要： An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved noise channels with reduced signal content. Directional detectors may be magnetometers aligned with the magnetic field, or antennas aligned with the electric field, of signal or noise sources. Alignment may be performed by beam steering of the outputs of a three-channel detector, which may detect both signal and noise.
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公开(公告)号：US06400646B1
公开(公告)日：2002-06-04
申请号：US09457996
申请日：1999-12-09
申请人： Vimal V. Shah , John W. Minear , Robert Malloy , James R. Birchak , Wallace R. Gardner , Carl Robbins
发明人： Vimal V. Shah , John W. Minear , Robert Malloy , James R. Birchak , Wallace R. Gardner , Carl Robbins
IPC分类号： H04H900
摘要： A system is disclosed for synchronizing a clock in a well containing a drill string with a clock located near the surface of the well. The system includes devices for transmitting and receiving a pair of acoustic signals between locations associated with each clock and processing those signals. The system determines the time of arrival of each acoustic signal by analyzing the shape of a function of the acoustic signal chosen from a group of functions suitable to determine a clock offset with millisecond accuracy.
摘要翻译： 公开了一种用于使包含钻柱的井中的时钟与位于井的表面附近的时钟同步的系统。 该系统包括用于在与每个时钟相关联的位置之间发送和接收一对声信号并处理这些信号的装置。 系统通过分析从适合于以毫秒精度确定时钟偏移的一组函数中选择的声信号的函数的形状来确定每个声信号的到达时间。
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23.发明授权Method and apparatus for remote actuation of a downhole device using a resonant chamber 失效使用谐振室远程致动井下装置的方法和装置公开(公告)号：US06172614B2
公开(公告)日：2001-01-09
申请号：US09114456
申请日：1998-07-13
IPC分类号： G01V300
CPC分类号： E21B23/06 , E21B47/18 , E21B47/182
摘要： The method of remotely actuating a downhole device provides the initiation of an acoustic signal. The acoustic signal is amplified within a resonance chamber and is transmitted down a fluid column in the tubing string or in the annulus around the tubing string. The signal can be coded to allow activation of multiple downhole devices. The use of a resonance chamber allows for the amplification of the actuation signal to ensure that a downhole receiver can detect it. The receiver can be either a transducer or a hydrophone. The apparatus and method allow for remote actuation without the need for intervention into the well.
摘要翻译： 遥控启动井下装置的方法提供了声信号的启动。 声信号在共振室内被放大，并且沿着油管柱中的流体柱或在管柱周围的环中向下传播。 该信号可被编码以允许激活多个井下装置。 使用共振室允许放大致动信号，以确保井下接收器能够检测到它。 接收器可以是换能器或水听器。 该装置和方法允许远程致动而不需要干涉井。
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公开(公告)号：US5490121A
公开(公告)日：1996-02-06
申请号：US291959
申请日：1994-08-17
申请人： Wallace R. Gardner , G. A. Merchant
发明人： Wallace R. Gardner , G. A. Merchant
CPC分类号： E21B47/18 , H04L25/03057
摘要： A nonlinear equalizer aids in transmitting data with more speed and accuracy by reducing nonlinear signal distortion such as found in a mud transmission channel in an MWD telemetry system. The nonlinear equalizer receives an input signal that is modified by at least one nonlinear function element. The nonlinear equalizer also includes multiple linear equalizers: one such linear equalizer receives the unmodified input signal, and the other linear equalizers receive output signals from the nonlinear function elements. Output signals of the linear equalizers are summed to provide the nonlinear equalizer's output signal.
摘要翻译： 非线性均衡器通过减少诸如在MWD遥测系统的泥浆传输通道中发现的非线性信号失真，有助于以更高的速度和精度传输数据。 非线性均衡器接收由至少一个非线性函数元素修改的输入信号。 非线性均衡器还包括多个线性均衡器：一个这样的线性均衡器接收未修改的输入信号，而另一个线性均衡器从非线性函数元件接收输出信号。 将线性均衡器的输出信号求和，以提供非线性均衡器的输出信号。
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公开(公告)号：US09638030B2
公开(公告)日：2017-05-02
申请号：US11945055
申请日：2007-11-26
摘要： One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acoustic signal is acquired from a propagation along the drill string in an approximately noise free environment.
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公开(公告)号：US20100039898A1
公开(公告)日：2010-02-18
申请号：US12605979
申请日：2009-10-26
IPC分类号： E21B47/16
CPC分类号： G01V11/002 , E21B47/16
摘要： An embodiment includes a method comprising receiving an acoustic signal that is modulated along a jointed tubing. The method also includes performing equalization over a passband of the acoustic signal to generate an equalized signal.
摘要翻译： 一个实施例包括一种方法，包括接收沿着接合管道调制的声信号。 该方法还包括在声信号的通带上执行均衡以产生均衡的信号。
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公开(公告)号：US20080137481A1
公开(公告)日：2008-06-12
申请号：US11945055
申请日：2007-11-26
摘要： One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acoustic signal is acquired from a propagation along the drill string in an approximately noise free environment.
摘要翻译： 一个实施例包括一种方法，包括接收沿着钻柱传播的声信号。 该方法还包括将声学信号与表示第一符号的第一存储的声学信号相关联，其中，在大致无噪声的环境中，沿着钻柱的传播获取第一存储的声学信号。
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28.发明授权公开(公告)号：US07324010B2
公开(公告)日：2008-01-29
申请号：US10984056
申请日：2004-11-09
IPC分类号： G01V11/00
CPC分类号： E21B47/16
摘要： Acoustic telemetry systems and methods with surface noise cancellation. One illustrative embodiment may include an acoustic telemetry system comprising a transmitter configured to generate an acoustic information signal that propagates along a drillstring, and a receiver configured to detect an acoustic receive signal from the drillstring and a noise signal from a surface environment. The receiver operates on the acoustic receive signal and the noise signal to produce a modified signal indicative of the acoustic information signal and having a reduced noise content relative to the acoustic receive signal.
摘要翻译： 声学遥测系统和具有表面噪声消除的方法。 一个说明性实施例可以包括声学遥测系统，该声学遥测系统包括被配置为生成沿着钻柱传播的声学信息信号的发射器，以及被配置为检测来自钻柱的声学接收信号和来自表面环境的噪声信号的接收器。 接收器根据声学接收信号和噪声信号进行操作，以产生指示声学信息信号并且相对于声学接收信号具有降低的噪声含量的经修改的信号。
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公开(公告)号：US07301473B2
公开(公告)日：2007-11-27
申请号：US10925267
申请日：2004-08-24
IPC分类号： G01V3/00
摘要： One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acoustic signal is acquired from a propagation along the drill string in an approximately noise free environment.
摘要翻译： 一个实施例包括一种方法，包括接收沿着钻柱传播的声信号。 该方法还包括将声学信号与表示第一符号的第一存储的声学信号相关联，其中，在大致无噪声的环境中，沿着钻柱的传播获取第一存储的声学信号。
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公开(公告)号：US07180825B2
公开(公告)日：2007-02-20
申请号：US10879408
申请日：2004-06-29
申请人： Vimal V. Shah , Wallace R. Gardner
发明人： Vimal V. Shah , Wallace R. Gardner
IPC分类号： H04H9/00
CPC分类号： E21B47/122 , E21B47/12 , G01V11/002
摘要： A communications system employing discrete multi-tone (“DMT”) modulated signals on a communications channel formed by inductively-coupled pipe. In one embodiment, the communications system includes a string of wired pipe joints that couple a transmitter to a receiver. Each pipe joint in the string possesses threaded ends configured for mechanically connecting with other pipe joints, a electrical or inductive coupler at each threaded end, and an insulated conductor that electrically connects the couplers. The transmitter and receiver communicate via DMT modulated signals transported by the wired pipe string. The system may further include multiple repeaters in the string. Each repeater may be configured to receive a DMT-modulated signal, to recover information from the DMT-modulated signal, and to re-transmit the information in the form of a DMT-modulated signal.
摘要翻译： 一种在由电感耦合管形成的通信信道上采用离散多音（“DMT”）调制信号的通信系统。 在一个实施例中，通信系统包括将发射机耦合到接收器的一串有线管接头。 弦中的每个管接头具有构造成与其他管接头机械连接的螺纹端，每个螺纹端处的电感或耦合器，以及电连接耦合器的绝缘导体。 发射机和接收机通过由有线管道传输的DMT调制信号进行通信。 该系统还可以包括串中的多个中继器。 每个中继器可以被配置为接收DMT调制信号，以从DMT调制信号中恢复信息，并且以DMT调制信号的形式重新发送信息。
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