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    • 33. 发明授权
    • Caliper logging using circumferentially spaced and/or angled transducer elements
    • 使用圆周间隔和/或成角度的换能器元件进行卡尺测井
    • US08117907B2
    • 2012-02-21
    • US12339229
    • 2008-12-19
    • Wei HanTsili Wang
    • Wei HanTsili Wang
    • E21B47/00
    • E21B47/082
    • A downhole tool includes circumferentially spaced and/or angled transducer elements. In one embodiment a standoff sensor has at least three piezoelectric transducer elements, at least a first element of which is configured to both transmit and receive ultrasonic energy. At least second and third of the elements are configured to receive ultrasonic energy transmitted by the first element in pitch catch mode. An electronic controller is configured to calculate a standoff distance from the ultrasonic waveforms received at the first, the second, and the third piezoelectric transducer elements. The controller may further be configured to estimate the eccentricity of a measurement tool in the borehole. Exemplary embodiments of the invention may improve borehole coverage and data quality and reliability in LWD caliper logging. In particular, the invention may advantageously reduce or even eliminate blind spots when logging eccentric bore holes.
    • 井下工具包括周向间隔开和/或成角度的换能器元件。 在一个实施例中,间隔传感器具有至少三个压电换能器元件,其至少第一元件被配置为发送和接收超声波能量。 至少第二和第三元件构造成在俯仰模式下接收由第一元件传递的超声波能量。 电子控制器被配置为计算从在第一,第二和第三压电换能器元件处接收的超声波波形的间隔距离。 控制器还可以被配置为估计钻孔中的测量工具的偏心度。 本发明的示例性实施例可以改进LWD卡尺测井中的井眼覆盖和数据质量和可靠性。 特别地,当记录偏心孔时,本发明可有利地减少甚至消除盲点。
    • 34. 发明授权
    • Correction of sensor non-equipotentiality in a resistivity imaging device
    • 电阻率成像装置中传感器非等电位的校正
    • US08014963B2
    • 2011-09-06
    • US12202687
    • 2008-09-02
    • Tsili WangStanislav W. Forgang
    • Tsili WangStanislav W. Forgang
    • G01R35/00
    • G01V3/24
    • A method for correcting data from a sensor electrode in a sensor includes determining a potential difference (V) between the sensor electrode and another sensor electrode; from the potential difference (V), determining a by-pass current (Ic) between the sensor electrode and the another sensor electrode; and from the by-pass current (Ic) and a measured current (I) from the sensor electrode, determining a corrected current (J) for the sensor electrode; wherein determining a potential (V1) for the sensor electrode comprises multiplying an intrinsic impedance (Zi1) by the measured current (I). A computer program product and other embodiments are provided.
    • 一种用于从传感器电极校正数据的方法,包括确定传感器电极和另一传感器电极之间的电位差(V); 从所述电位差(V)中确定所述传感器电极和所述另一传感器电极之间的旁路电流(Ic); 并根据传感器电极的旁通电流(Ic)和测量电流(I)确定传感器电极的校正电流(J); 其中确定传感器电极的电位(V1)包括将本征阻抗(Zi1)乘以测量的电流(I)。 提供了计算机程序产品和其他实施例。
    • 35. 发明申请
    • Microresistivity Imaging with Differentially Raised Electrodes
    • 微电极成像与差异升高的电极
    • US20110187374A1
    • 2011-08-04
    • US12699111
    • 2010-02-03
    • Tsili Wang
    • Tsili Wang
    • G01V3/00
    • G01V3/00
    • A microresistivity logging tool includes a measuring electrode deployed in and electrically isolated from a guard electrode. The measuring electrode is radially recessed with respect to at least a portion of the guard electrode. The raised portion of the guard electrode preferably extends radially outward from the tool body such that it contacts the borehole wall during drilling. A return electrode is spaced and electrically insulated from the guard electrode. Tools in accordance with the present invention enable good current focusing to be achieved while at the same time providing protection for the measuring electrode.
    • 微电阻率测井工具包括测量电极,其部署在保护电极中并与保护电极电隔离。 测量电极相对于保护电极的至少一部分径向凹陷。 保护电极的凸起部优选地从工具主体径向向外延伸,使得其在钻孔期间与钻孔壁接触。 返回电极与保护电极间隔开并电绝缘。 根据本发明的工具能够实现良好的电流聚焦,同时为测量电极提供保护。