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    Method and apparatus for directional resistivity measurement while drilling
    3.
    发明申请
    Method and apparatus for directional resistivity measurement while drilling 有权
    钻孔时方向电阻率测量的方法和装置

    公开(公告)号：US20060186888A1

    公开(公告)日：2006-08-24

    申请号：US11398518

    申请日：2006-04-05

    申请人： Tsili Wang ,  Leonty Tabarovsky ,  Boris Tchakarov ,  John Signorelli ,  Sheng Fang

    发明人： Tsili Wang ,  Leonty Tabarovsky ,  Boris Tchakarov ,  John Signorelli ,  Sheng Fang

    IPC分类号： G01V3/18

    CPC分类号： G01V3/28

    摘要： A measurement-while-drilling or logging while drilling method and apparatus for determining the azimuth of providing magnetic field in a remote formation layer in the vicinity of a down hole resistivity tool. A cross-component magnetic field with substantially orthogonal transmitter and receiver coils is provided. The coil planes are either substantially orthogonal (coaxial coils) or parallel (transverse coils) with respect to, the longitudinal axis of the tool body. The coils are placed on the tool body having a external surface and a plurality of grooves are cut in the external surface of the tool body and oriented substantially horizontally with respect to the longitudinal axis of the tool body for the coils and oriented vertically with respect to the longitudinal axis of the tool body for the coaxial coils. A transverse and coaxial coil are placed in the grooves for transmission or reception of a cross-component transverse magnetic field. Ferrite materials may be inserted in the grooves in between the coil wire and the bottom of the grooves. Multiple receivers, transmitters and frequencies may be used to obtain the maximum possible signal-to-noise ratio. The in-phase or quadrature part of a magnetic field, or a combination of the two, or alternatively, the amplitude and/or phase, of the cross-component magnetic field may be measured and processed to indicate the azimuth of a remote layer boundary, provided that the layer boundary is within the depth of investigation of the tool. Measurements may also be made at continuous or multiple tool azimuths.

    摘要翻译： 在钻孔方法和装置中，用于确定在井下电阻率工具附近的远程地层中提供磁场的方位的钻孔方法和装置。 提供了具有基本上正交的发射器和接收器线圈的交叉分量磁场。 线圈平面相对于工具主体的纵向轴线基本正交（同轴线圈）或平行（横向线圈）。 线圈被放置在具有外表面的工具主体上，并且在工具主体的外表面上切割出多个槽，并且相对于用于线圈的工具主体的纵向轴线基本上水平地定向并相对于 用于同轴线圈的工具主体的纵向轴线。 横向和同轴线圈放置在沟槽中，用于传输或接收横向分量横向磁场。 铁氧体材料可以插入到线圈线和槽的底部之间的凹槽中。 可以使用多个接收器，发射器和频率来获得最大可能的信噪比。 可以测量和处理磁场的同相或正交部分，或两者的组合，或备选地，横分量磁场的振幅和/或相位，以指示远程层边界的方位角 ，条件是层边界在工具的调查深度之内。 也可以在连续或多个工具方位进行测量。