公开(公告)号：US06583729B1

公开(公告)日：2003-06-24

申请号：US09507610

申请日：2000-02-21

申请人： Wallace R. Gardner ,  Vimal V. Shah ,  Donald Kyle

发明人： Wallace R. Gardner ,  Vimal V. Shah ,  Donald Kyle

IPC分类号： G01V300

CPC分类号： G01V11/002

摘要： A reliable downhole acoustic telemetry system with increased data rate is disclosed. In one embodiment, the telemetry system includes a receiver having an envelope-detection demodulator and a multipulse-block distance detector that compares a baseband envelope signal to stored waveforms and indicates for each symbol interval the multipulse block having the waveform closest to the baseband envelope signal. The receiver may also include a timing recovery module that models the baseband envelope signal for the detected multipulse blocks and determines a distance for early-sampling and late-sampling of the baseband envelope signal. The timing recovery module then provides a sampling clock that minimizes the average difference between the early- and late-sampling distances. The telemetry system may further include a transmitter having an encoder and a modulator. The encoder converts a data signal into a sequence of multipulse blocks having a settling interval between the blocks. The modulator modulates the multipulse block sequence with a carrier frequency to produce an amplitude modulated signal. The telemetry system may have the transmitter and receiver coupled to a tubing string by an acoustic signal generator and an acoustic transducer, respectively. The acoustic signal generator converts the amplitude modulated signal into acoustic waves that propagate along the tubing string to the acoustic transducer, which then converts the acoustic waves into a receive signal. The system and method disclosed may advantageously provide a robust, low-power telemetry system that communicates telemetry along a tubing string at a rate that is at least an order of magnitude greater than existing acoustic telemetry methods.

摘要翻译： 公开了一种具有增加的数据速率的可靠的井下声学遥测系统。 在一个实施例中，遥测系统包括具有包络检测解调器和多脉冲块距离检测器的接收机，其将基带包络信号与存储的波形进行比较，并且针对每个符号间隔指示具有最接近基带包络信号的波形的多脉冲块 。 接收机还可以包括定时恢复模块，其对所检测到的多脉冲块进行基带包络信号的建模，并确定基带包络信号的早期采样和后采样的距离。 定时恢复模块然后提供采样时钟，其使得早期和晚期采样距离之间的平均差异最小化。 遥测系统还可以包括具有编码器和调制器的发射机。 编码器将数据信号转换为在块之间具有建立间隔的多脉冲块序列。 调制器用载波频率调制多脉冲块序列以产生幅度调制信号。 遥测系统可以分别通过声信号发生器和声换能器将发射器和接收器耦合到油管柱。 声信号发生器将幅度调制信号转换成沿着管柱传播到声换能器的声波，声换能器然后将声波转换成接收信号。 所公开的系统和方法可以有利地提供鲁棒的低功率遥测系统，其以比现有的声学遥测方法大至少一个数量级的速率沿油管柱传送遥测。

公开(公告)号：US08634273B2

公开(公告)日：2014-01-21

申请号：US12605979

申请日：2009-10-26

申请人： Wallace R. Gardner ,  Vimal V. Shah ,  Carl A. Robbins

发明人： Wallace R. Gardner ,  Vimal V. Shah ,  Carl A. Robbins

IPC分类号： E21B47/16

CPC分类号： G01V11/002 ,  E21B47/16

摘要： An embodiment includes a method comprising transmitting and receiving an acoustic signal that is modulated along a jointed tubing. The acoustic signal may be transmitted in multiple passbands of the jointed tubing and may be modulated differently in different passbands. A swept frequency signal may be used to determine transmission characteristics of the jointed tubing and to select the multiple passbands. Additional embodiments are disclosed.

摘要翻译： 一个实施例包括一种方法，包括发送和接收沿着接合管道调制的声信号。 声信号可以在连接管道的多个通带中传输，并且可以在不同的通带中被不同地调制。 可以使用扫频信号来确定连接管道的传输特性并选择多个通带。 公开了另外的实施例。

公开(公告)号：US07468678B2

公开(公告)日：2008-12-23

申请号：US11560079

申请日：2006-11-15

申请人： Vimal V. Shah ,  Wallace R Gardner

发明人： Vimal V. Shah ,  Wallace R Gardner

IPC分类号： G01V3/00

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 retransmit 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，并以DMT调制信号的形式重发信息。

公开(公告)号：US06619394B2

公开(公告)日：2003-09-16

申请号：US09731873

申请日：2000-12-07

申请人： Mohamed Y. Soliman ,  Ali I. Mese ,  Clark E. Robison ,  James R. Birchak ,  Paul F. Rodney ,  Wei Han ,  Vimal V. Shah ,  Eugene J. Linyaev ,  Mark A. Proett

发明人： Mohamed Y. Soliman ,  Ali I. Mese ,  Clark E. Robison ,  James R. Birchak ,  Paul F. Rodney ,  Wei Han ,  Vimal V. Shah ,  Eugene J. Linyaev ,  Mark A. Proett

IPC分类号： E21B2800

CPC分类号： G01V1/44 ,  E21B28/00 ,  E21B43/003

摘要： A process and apparatus for treating a wellbore, comprising subjecting a substantially same portion of the wellbore to vibratory waves produced by a plurality of vibratory wave generators. The vibratory waves may have about the same frequency or a plurality of frequencies, and the frequencies may partially overlap, not overlap, or be modulated across a range. Additionally, the frequencies may be modulated in an oval, hoop, and flexural modes. The vibratory waves may be produced by firing the vibratory wave generators simultaneously or in sequence. Combinations of a vibrating pipe, piston pulser, or valve may be used as vibratory wave generators. In a preferred embodiment, the thickness and change of thickness of a mudcake on the interior surface of a wellbore are measured to evaluate the effectiveness of the wellbore treatment.

摘要翻译： 一种用于处理井眼的方法和装置，包括使井筒的基本相同的部分经受由多个振动波发生器产生的振动波。 振动波可以具有大约相同的频率或多个频率，并且频率可以部分地重叠，而不是重叠，或者在一个范围上被调制。 另外，频率可以以椭圆形，环形和弯曲模式进行调制。 振动波可以通过同时或依次点火振动波发生器来产生。 振动管，活塞式脉冲发生器或阀门的组合可用作振动波发生器。 在优选的实施方案中，测量在井筒内表面上的泥饼的厚度和厚度变化，以评估井眼处理的有效性。

公开(公告)号：US06370082B1

公开(公告)日：2002-04-09

申请号：US09332641

申请日：1999-06-14

申请人： Wallace R. Gardner ,  Vimal V. Shah ,  John W. Minear

发明人： Wallace R. Gardner ,  Vimal V. Shah ,  John W. Minear

IPC分类号： G01V140

CPC分类号： E21B47/16

摘要： An acoustic telemetry system is disclosed that reduces any through-drillstring drilling noise which contaminates a through-drillstring telemetry signal. Normal filtering operations are provided to remove noise outside the frequency band of interest, and reference signal filtering operations are provided to reduce the in-band noise, thereby enhancing the telemetry system's data rate and reliability. In one embodiment, the acoustic telemetry system includes a transmitter and a receiver. The transmitter induces an acoustic information signal that propagates along the tubing string. Existing noise in the tubing string contaminates the information signal. The receiver is provided with sensors for measuring the corrupted information signal and a reference signal that is indicative of the noise present in the measured information signal. The receiver uses a filter to convert the reference signal into an estimate of the information signal corruption, and a summing element to subtract the estimate from the reference signal to produce an information signal with reduced corruption. In a preferred embodiment, the information signal is propagated in an axial transmission mode, and the noise in the torsional mode is used as the reference signal for reducing noise the information signal picks up in the axial mode.

摘要翻译： 公开了一种声学遥测系统，其减少了污染通过钻柱遥测信号的任何穿钻钻井噪声。 提供正常滤波操作以去除感兴趣频带外的噪声，并提供参考信号滤波操作以减少带内噪声，从而提高遥测系统的数据速率和可靠性。 在一个实施例中，声学遥测系统包括发射器和接收器。 发射器引起沿着管柱传播的声信息信号。 油管柱中的现有噪声会污染信息信号。 接收器设置有用于测量损坏的信息信号的传感器和指示所测量的信息信号中存在的噪声的参考信号。 接收机使用滤波器将参考信号转换为信息信号损坏的估计，以及相加元件，以从参考信号中减去估计，以产生具有减少的损坏的信息信号。 在优选实施例中，信息信号以轴向传播模式传播，并且扭转模式中的噪声被用作用于降低信息信号以轴向模式拾取的噪声的参考信号。

公开(公告)号：US06320820B1

公开(公告)日：2001-11-20

申请号：US09400357

申请日：1999-09-20

申请人： Wallace R. Gardner ,  Vimal V. Shah

发明人： Wallace R. Gardner ,  Vimal V. Shah

IPC分类号： H04H900

CPC分类号： E21B47/16

摘要： A reliable, high data rate, downhole acoustic telemetry system is disclosed. In one embodiment, the acoustic telemetry system includes a tubing string with an acoustic transmitter and an acoustic receiver mounted on it. The acoustic transmitter transmits telemetry information by modulating an acoustic carrier frequency that propagates along the walls of the tubing string. The transmitter is preferably mounted at a selected position relative to the end of the tubing string. The selected position is preferably less than &lgr;/4 from the end or approximately n&lgr;/2 from the end, where &lgr; is the wavelength of the carrier frequency in the tubing string, and n is a positive integer. In a more preferred embodiment, n may be the lesser of 4 times the number of cycles in the modulating toneburst and 40. The receiver is preferably mounted at approximately (2n−1)&lgr;/4 relative to the end of the tubing string, where n is a positive integer. Such positioning prevents reflections of the acoustic signal from significantly degrading the received signal. The acoustic signaling advantageously employs pulse shaping to further improve system performance. To enhance data transmission rates, the acoustic receiver advantageously includes an equalizer that compensates for signal dispersion and intersymbol interference while simultaneously minimizing other forms of signal corruption such as additive noise and channel nonlinearities. The equalizer is preferably an adaptive, nonlinear equalizer that may also be fractionally spaced. Such equalizers eliminate any requirements for spacing intervals which allow signal reflections to die out. The resulting system is capable of higher data rates. When error correction codes are employed, no reliability losses are incurred.

摘要翻译： 公开了一种可靠，高数据速率的井下声学遥测系统。 在一个实施例中，声学遥测系统包括具有声发射器的管柱和安装在其上的声学接收器。 声发射器通过调制沿着管柱的壁传播的声载波频率来发射遥测信息。 变送器优选地安装在相对于油管柱的端部的选定位置处。 所选择的位置优选地从末端小于lambd / 4或从末端起大约nlambd / 2，其中lambd是油管柱中载波频率的波长，n是正整数。 在更优选的实施例中，n可以是调制色调峰值和40中循环次数的4倍中的较小值。接收器优选地相对于管柱的端部以大约（2n-1）lambd / 4安装，其中 n是正整数。 这种定位防止声信号的反射显着地降低接收的信号。 声信号有利地采用脉冲整形来进一步提高系统性能。 为了增强数据传输速率，声接收机有利地包括补偿信号色散和符号间干扰的均衡器，同时最小化诸如加性噪声和信道非线性的其它形式的信号损坏。 均衡器优选地是也可以是分数间隔的自适应非线性均衡器。 这种均衡器消除了允许信号反射消失的间隔间隔的任何要求。 所得到的系统能够获得更高的数据速率。 当采用纠错码时，不会产生可靠性损失。

公开(公告)号：US07997380B2

公开(公告)日：2011-08-16

申请号：US10873087

申请日：2004-06-22

申请人： Abbas Arian ,  Gary L. Fickert ,  Joakim O. Blanch ,  Vimal V. Shah ,  Eugene Linyaev

发明人： Abbas Arian ,  Gary L. Fickert ,  Joakim O. Blanch ,  Vimal V. Shah ,  Eugene Linyaev

IPC分类号： G01V1/40

CPC分类号： E21B47/16 ,  G01V1/523

摘要： An attenuation apparatus, system, and method are disclosed. The attenuator is attached to a pipe and includes a housing that includes an inner sleeve and an outer sleeve. The attenuator includes one or more masses, to resonate when exposed to waves including acoustic frequency components.

摘要翻译： 公开了一种衰减装置，系统和方法。 衰减器附接到管道并且包括包括内套筒和外套筒的壳体。 衰减器包括一个或多个质量，当暴露于包括声频分量的波时产生共振。

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

CPC分类号： G01V1/26 ,  E21B47/16 ,  G04G7/00 ,  H04L7/007

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。

公开(公告)号：US20120234107A1

公开(公告)日：2012-09-20

申请号：US13478747

申请日：2012-05-23

申请人： Sairam KS Pindiprolu ,  Vimal V. Shah ,  Li Gao

发明人： Sairam KS Pindiprolu ,  Vimal V. Shah ,  Li Gao

IPC分类号： G01L3/10

CPC分类号： G01N11/14 ,  G01N2011/0086

摘要： Disclosed is an apparatus and method for accurately measuring torque in a rotating shaft. The apparatus comprises axially spaced magnet-detector pairs, mounted to rotate with the shaft and means for sensing relative rotation between the magnets.

摘要翻译： 公开了一种用于精确地测量旋转轴中的扭矩的装置和方法。 该装置包括安装成与轴一起旋转的轴向间隔开的磁体 - 检测器对，以及用于检测磁体之间的相对旋转的装置。

公开(公告)号：US20100039898A1

公开(公告)日：2010-02-18

申请号：US12605979

申请日：2009-10-26

申请人： Wallace R. Gardner ,  Vimal V. Shah ,  Carl A. Robbins

发明人： Wallace R. Gardner ,  Vimal V. Shah ,  Carl A. Robbins

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。