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    • 9. 发明授权
    • Multi-component induction instrument
    • 多组分感应仪
    • US06677756B2
    • 2004-01-13
    • US09922393
    • 2001-08-03
    • Otto FaniniStanislav W. Forgang
    • Otto FaniniStanislav W. Forgang
    • G01V318
    • G01V3/28
    • An improved induction tool for formation resistivity evaluations. The tool provides electromagnetic transmitters and sensors suitable for transmitting and receiving magnetic fields in radial directions that are orthogonal to the tool's longitudinal axis with minimal susceptibility to errors associated with parasitic eddy currents induced in the metal components surrounding the transmitter and receiver coils. The present invention provides increased effective tool surface impedance by increasing self-inductance of the paths in which induced eddy currents flow on the surface of the multi-component induction instruments. The tool enables downhole tool designers to build more effective and better-protected radial induction arrays for existing and future downhole instruments operating in the frequency and/or time domains. In this case the array measurement results contain information primarily about the formation's vertical resistivity. The tool makes it possible to combine radial arrays with coaxial arrays that conventionally measure horizontal formation resistivity. This combination enables obtaining a full resistivity tensor to evaluate formation resistivity anisotropy. The tool provides a composite non-conductive housing to reduce or even avoid the effects of parasitic eddy currents flowing on the tool surface. The tool provides a non-magnetic housing that is conductive which reduces the effects of conductive materials near coils and, primarily, the receiver. The tool provides a non-conductive coating is placed over the housing to prevent high frequency eddy currents from leaking from the housing in the conductive mud of the adjacent wellbore and returning to the housing.
    • 改进的地层电阻率评估感应工具。 该工具提供电磁发射器和传感器,适用于在与工具的纵向轴线正交的径向方向上发射和接收磁场,对与发射器和接收器线圈周围的金属部件中感应的寄生涡流有关的误差的影响最小。 本发明通过增加感应涡流在多部件感应仪器的表面上流动的路径的自感来提供增加的有效工具表面阻抗。 该工具使井下工具设计人员能够为在频率和/或时域工作的现有和未来的井下仪器构建更有效和更好保护的径向感应阵列。 在这种情况下,阵列测量结果包含主要关于地层垂直电阻率的信息。 该工具使得可以将径向阵列与常规测量水平地层电阻率的同轴阵列组合。 这种组合使得能够获得全电阻率张量以评估地层电阻率各向异性。 该工具提供复合非导电外壳,以减少或甚至避免流入工具表面的寄生涡流的影响。 该工具提供导电的非磁性壳体,其减少线圈附近的导电材料的影响,主要是接收器的影响。 该工具提供非导电涂层放置在壳体上以防止高频涡流从相邻井眼的导电泥浆中的壳体泄漏并返回到壳体。
    • 10. 发明授权
    • Efficient and accurate pseudo 2-D inversion scheme for multicomponent induction log data
    • 用于多组分感应日志数据的高效准确的伪2-D反演方案
    • US06618676B2
    • 2003-09-09
    • US10060108
    • 2002-01-29
    • Berthold KriegshauserSteve McWilliamsOtto FaniniLiming Yu
    • Berthold KriegshauserSteve McWilliamsOtto FaniniLiming Yu
    • G01V326
    • G01V3/28G01V11/00
    • A fast, efficient and accurate pseudo 2-D inversion scheme for resistivity determination of an anisotropic formation uses data from a tool (3DEX) comprising three transmitters and three corresponding receivers sampling the formation in a plurality of spatial directions. An initial model of the formation including invasion zones is obtained using a conventional multifrequency and/or multispacing logging tool. A pseudo 2-D inversion scheme combines an accurate full 2-D forward solution of the synthetic responses of the earth model with a 1-D approximation of the sensitivity matrix of the horizontally layered anisotropic background model. The timesaving compared to a regular 2-D inversion scheme can be tremendous. The applicability of this scheme is important in cases when borehole and near-zone effects do not allow an interpretation based on 1-D inversion. A comparison of the pseudo 2-D inversion scheme versus a full 2-D inversion using a realistic synthetic example shows that the pseudo 2-D inversion scheme performs as well as the full 2-D inversion, but in a much shorter time.
    • 用于各向异性形成的电阻率确定的快速,有效和准确的伪2-D反演方案使用来自包括三个发射器和三个对应的接收器的工具(3DEX)的数据,该三个发射器和三个对应的接收器在多个空间方向上对地层进行采样。 使用常规的多频和/或多分段测井工具获得包括入侵区的地层的初始模型。 伪2-D反演方案将地球模型的合成响应的准确的全2-D向前解与水平分层各向异性背景模型的灵敏度矩阵的1-D近似相结合。 与普通2-D反演方案相比,时间可以是巨大的。 当井眼和近区效应不允许基于1-D反演的解释时,该方案的适用性是重要的。 使用实际的合成实例,伪2-D反演方案与全2-D反转的比较表明,伪2-D反演方案与完整的2-D反转相同,但是在更短的时间内。