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    • 111. 发明授权
    • Method and apparatus for acoustic fluid analysis
    • 声学流体分析方法和装置
    • US06401538B1
    • 2002-06-11
    • US09655545
    • 2000-09-06
    • Wei HanJames Robert BirchakBruce H. Storm, Jr.
    • Wei HanJames Robert BirchakBruce H. Storm, Jr.
    • G01N2902
    • E21B47/101G01N9/24G01N15/00G01N29/032G01N29/223G01N29/4472G01N2291/024G01N2291/02818G01N2291/103
    • A method is provided for analyzing suspended particulate and liquid medium in a fluid stream by transmitting acoustic signals into the fluid, detecting scattered acoustic energy, and determining a parameter related to the density and compressibility of the fluid. In one embodiment, the fluid analysis tool comprises two transmitting transducers intermittently emitting acoustic signals, and two receiving transducers being differently azimuthally positioned with respect to the transmitters. The ratio of the amplitude of scattered signals measured by the two receivers as a result of emission from the first and second transmitters are used to calculate the parameter. In another embodiment, a tool comprising one transmitter and at least three receivers with azimuthal angles in both forward and backward scattering regions with respect to the incident wave is disclosed. The scattering signal amplitudes normalized by the amplitude from one of the receivers is used to identify and monitor the system.
    • 提供了一种用于通过将声信号传输到流体中来分析流体流中的悬浮颗粒和液体介质的方法,检测分散的声能,以及确定与流体的密度和压缩性相关的参数。 在一个实施例中,流体分析工具包括间歇地发射声学信号的两个发射换能器,并且两个接收换能器相对于发射器不同于方位角定位。 使用由两个接收器测量的由第一和第二发射器发射的结果的散射信号的振幅比来计算该参数。 在另一个实施例中,公开了一种包括一个发射器和至少三个接收器的工具,所述至少三个接收器在前向和后向散射区域中相对于入射波具有方位角。 使用来自一个接收机的振幅归一化的散射信号幅度用于识别和监视系统。
    • 120. 发明授权
    • Reduction of tool mode and drilling noise in acoustic LWD
    • 降低声学LWD中的工具模式和钻孔噪声
    • US09115568B2
    • 2015-08-25
    • US12568847
    • 2009-09-29
    • Wei HanJun ZhangPaul Boonen
    • Wei HanJun ZhangPaul Boonen
    • G01V1/46E21B47/01
    • E21B47/01G01V1/46
    • A downhole measurement tool includes at least one regular receiver and at least one reference receiver externally deployed on a tool body. The reference receiver is configured to be acoustically isolated from the borehole, for example, via an isolation structure including a high-impedance cap and a low-impedance gap. The reference receiver may be deployed in a linear array with the regular receiver(s) and may be substantially identical to the regular receiver(s) such that it has substantially the same sensitivity to tool mode signals and internal drilling noise as do the regular receivers. Received waveforms may be processed so as to remove tool mode arrivals and/or drilling noise.
    • 井下测量工具包括至少一个常规接收器和外部部署在工具主体上的至少一个参考接收器。 参考接收器被配置为与钻孔隔声隔离,例如通过包括高阻抗帽和低阻抗间隙的隔离结构。 参考接收机可以部署在具有常规接收机的线性阵列中,并且可以与常规接收机基本相同,使得其具有与工作模式信号和内部钻孔噪声基本相同的灵敏度,如常规接收机 。 可以处理接收的波形,以便去除工具模式到达和/或钻孔噪声。