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1. 发明授权

US5999883A Conductivity anisotropy estimation method for inversion processing of measurements made by a transverse electromagnetic induction logging instrument 失效
标题翻译：横向电磁感应测井仪测量电导率各向异性估算方法
公开(公告)号：US5999883A
公开(公告)日：1999-12-07
申请号：US42982
申请日：1998-03-17
申请人： Pravin Gupta , Berthold F. Kriegshauser , Otto N. Fanini
发明人： Pravin Gupta , Berthold F. Kriegshauser , Otto N. Fanini
IPC分类号： E21B41/00 , G01V3/28 , G06F19/00 , G01V3/38
CPC分类号： G01V3/28 , E21B2041/0028
摘要： A method for determining an initial estimate of the horizontal conductivity and the vertical conductivity of an anisotropic earth formation. Electromagnetic induction signals induced by induction transmitters oriented along three mutually orthogonal axes are measured. One of the mutually orthogonal axes is substantially parallel to a logging instrument axis. The electromagnetic induction signals are measured using first receivers each having a magnetic moment parallel to one of the orthogonal axes and using second receivers each having a magnetic moment perpendicular to a one of the orthogonal axes which is also perpendicular to the instrument axis. A relative angle of rotation of the perpendicular one of the orthogonal axes is calculated from the receiver signals measured perpendicular to the instrument axis. An intermediate measurement tensor is calculated by rotating magnitudes of the receiver signals through a negative of the angle of rotation. A relative angle of inclination of one of the orthogonal axes which is parallel to the axis of the instrument is calculated, from the rotated magnitudes, with respect to a direction of the vertical conductivity. The rotated magnitudes are rotated through a negative of the angle of inclination. Horizontal conductivity is calculated from the magnitudes of the receiver signals after the second step of rotation. An anisotropy parameter is calculated from the receiver signal magnitudes after the second step of rotation. Vertical conductivity is calculated from the horizontal conductivity and the anisotropy parameter.
摘要翻译：一种用于确定各向异性地层的水平导电率和垂直导电率的初始估计的方法。测量由三个相互正交的轴取向的感应发射器引起的电磁感应信号。相互正交的轴之一基本上平行于测井仪器轴线。使用第一接收器测量电磁感应信号，每个接收机具有平行于正交轴之一的磁矩，并且使用第二接收器，每个接收器具有垂直于垂直于仪器轴的正交轴之一的磁矩。从垂直于仪器轴测量的接收机信号计算垂直轴之一的相对旋转角度。通过将接收机信号的大小旋转通过旋转角度的负值来计算中间测量张量。相对于垂直导电率的方向，从旋转的大小计算平行于仪器的轴线的正交轴之一的相对倾斜角。旋转的大小通过倾斜角度的负值旋转。在第二个旋转步骤之后，根据接收机信号的幅度计算水平电导率。从第二步旋转后的接收机信号幅度计算各向异性参数。垂直电导率由水平电导率和各向异性参数计算。

2. 发明授权

US06466872B1 Method for determination of apparent resistivities of anisotropic reservoirs 有权
标题翻译：测定各向异性储层表观电阻率的方法
公开(公告)号：US06466872B1
公开(公告)日：2002-10-15
申请号：US09676097
申请日：2000-09-29
申请人： Berthold F. Kriegshauser , Otto N. Fanini , Pravin Gupta , Liming Yu
发明人： Berthold F. Kriegshauser , Otto N. Fanini , Pravin Gupta , Liming Yu
IPC分类号： G01V318
CPC分类号： G01V3/28
摘要： Shoulder corrections are applied to measurements obtained from a multicomponent electromagnetic logging tool. An anisotropic resistivity model is obtained using the shoulder corrected data. The process is iterated until a good match is obtained between the shoulder corrected data and the model output.
摘要翻译：肩部校正适用于从多组分电磁测井仪获得的测量。使用肩部校正数据获得各向异性电阻率模型。迭代该过程直到在肩部校正数据和模型输出之间获得良好的匹配。

3. 发明授权

US5999884A Method for determining the axial position of formation layer boundaries using measurements made by a transverse electromagnetic induction logging instrument 失效
标题翻译：用横向电磁感应测井仪测量地层边界轴向位置的方法
公开(公告)号：US5999884A
公开(公告)日：1999-12-07
申请号：US44741
申请日：1998-03-19
申请人： Berthold F. Kriegshauser , Pravin Gupta , Zeljko Jericevic , Otto N. Fanini
发明人： Berthold F. Kriegshauser , Pravin Gupta , Zeljko Jericevic , Otto N. Fanini
IPC分类号： E21B41/00 , G01V3/28 , G01V3/38
CPC分类号： G01V3/28 , E21B2041/0028
摘要： A method for estimating axial positions of formation layer boundaries from transverse electromagnetic induction signals. A first derivative is calculated with respect to depth of the induction signals. A second derivative of the signals is calculated. The second derivative is muted. Layer boundaries are selected at axial positions where the muted second derivative is non zero, and the first derivative changes sign. The selected boundaries are thickness filtered to eliminate boundaries which have the same axial spacing as the spacing between an induction transmitter and receiver used to measure the induction signals, and to eliminate boundaries having a spacing less than an axial resolution of the induction signals. In a preferred embodiment, the process is repeated using transverse induction measurements made at another alternating current frequency. Layer boundaries selected in both frequencies are determined to be the layer boundaries. An alternative embodiment includes Fourier transforming the induction signals into the spatial frequency domain, low pass filtering the Fourier transformed signals at a band limit about equal to the axial resolution of the induction signals, calculating a central first derivative of the filtered, Fourier transformed signals, calculating an inverse Fourier transform of the central first derivative, determining roots of the inverse Fourier transform, and testing localized properties of the inverse Fourier transform within a selected number of data sample points of the selected roots, thereby providing indications of formation layer boundaries at axial positions most likely to be true ones of the formation layer boundaries.
摘要翻译：一种用于估计地层层边界与横向电磁感应信号的轴向位置的方法。相对于感应信号的深度计算一阶导数。计算信号的二阶导数。二阶导数被静音。在静态二阶导数不为零的轴位置选择层边界，第一导数更改符号。所选择的边界被厚度滤波以消除与用于测量感应信号的感应发射器和接收器之间的间隔具有相同轴向间距的边界，并且消除间隔小于感应信号的轴向分辨率的边界。在优选实施例中，使用在另一交流频率下进行的横向感应测量来重复该过程。在两个频率中选择的层边界被确定为层边界。一个替代实施例包括将感应信号傅里叶变换成空间频域，在大约等于感应信号的轴向分辨率的频带限制下对傅里叶变换信号进行低通滤波，计算滤波后的傅里叶变换信号的中心一阶导数，计算中心一阶导数的傅里叶逆变换，确定逆傅里叶变换的根，并在所选择的根的选定数量的数据采样点内测试逆傅里叶变换的局部特性，从而在轴向上提供形成层边界的指示位置最有可能是形成层边界的真实位置。

4. 发明授权

US06553314B2 Method for determination of apparent resistivities of anisotropic reservoirs 失效
公开(公告)号：US06553314B2
公开(公告)日：2003-04-22
申请号：US10244960
申请日：2002-09-17
申请人： Berthold F. Kriegshauser , Otto N. Fanini , Pravin Gupta , Liming Yu
发明人： Berthold F. Kriegshauser , Otto N. Fanini , Pravin Gupta , Liming Yu
IPC分类号： G01V338
CPC分类号： G01V3/28
摘要： Shoulder corrections are applied to measurements obtained from a multi-component electromagnetic logging tool. An anisotropic resistivity model is obtained using the shoulder corrected data. The process is iterated until a good match is obtained between the shoulder corrected data and the model output.

5. 发明授权

US6044325A Conductivity anisotropy estimation method for inversion processing of measurements made by a transverse electromagnetic induction logging instrument 失效
标题翻译：横向电磁感应测井仪测量电导率各向异性估算方法
公开(公告)号：US6044325A
公开(公告)日：2000-03-28
申请号：US119926
申请日：1998-07-21
申请人： Srinivasa Chakravarthy , Pravin Gupta , Raghu Chunduru , Berthold F. Kriegshauser , Otto N. Fanini
发明人： Srinivasa Chakravarthy , Pravin Gupta , Raghu Chunduru , Berthold F. Kriegshauser , Otto N. Fanini
IPC分类号： E21B41/00 , G01V3/28 , G01V3/38 , G06F19/00
CPC分类号： G01V3/38 , G01V3/28 , E21B2041/0028 , Y10S706/929
摘要： A method for generating an improved estimate of horizontal conductivity, dip angle, azimuth and anisotropy parameter of an earth formation penetrated by a wellbore from dual-frequency transverse electromagnetic induction measurements, comprising generating an initial estimate of the horizontal conductivity, dip angle, azimuth and anisotropy parameter from the dual-frequency transverse induction measurements made at each one of a plurality of base frequencies. The initial estimates from each of the plurality of base frequencies are input into a primary trained neural network, and the improved estimate is calculated by the trained neural network. The network is trained by generating models of earth formations each having a known value of horizontal conductivity, anisotropy parameter, dip angle and azimuth. Voltages which would be measured by the transverse electromagnetic induction instrument in response to each model are synthesized. Initial estimates from the synthesized voltages are calculated and the initial estimates and known values from each of the models are input to the neural network to cause it to learn a relationship between the initial estimates and the known values.
摘要翻译：一种用于从双频横向电磁感应测量产生由井眼穿透的地层的水平电导率，倾角，方位角和各向异性参数的改进估计的方法，包括产生水平电导率，倾角，方位角和来自在多个基本频率中的每一个处进行的双频横向感应测量的各向异性参数。将来自多个基本频率中的每一个的初始估计值输入到初级训练的神经网络中，并且经过训练的神经网络计算改进的估计值。通过产生具有水平导电性，各向异性参数，倾角和方位角的已知值的地层模型来训练网络。合成了横向电磁感应仪器响应每个模型测量的电压。计算合成电压的初始估计值，并将来自每个模型的初始估计值和已知值输入到神经网络，以使其学习初始估计值与已知值之间的关系。

6. 发明授权

US5854991A Method for inversion processing of transverse electromagnetic induction well logging measurements 失效
标题翻译：横向电磁感应测井测量的反演处理方法
公开(公告)号：US5854991A
公开(公告)日：1998-12-29
申请号：US67567
申请日：1998-04-28
申请人： Pravin Gupta , Berthold F. Kriegshauser , Zeljko Jericevic , Otto N. Fanini
发明人： Pravin Gupta , Berthold F. Kriegshauser , Zeljko Jericevic , Otto N. Fanini
IPC分类号： E21B41/00 , G01V3/28 , G06F19/00
CPC分类号： G01V3/28 , E21B2041/0028
摘要： A method for determining the 2-dimensional distribution of horizontal and vertical electrical conductivities of earth formations surrounding a wellbore using measurements made by a transverse electromagnetic induction well logging instrument. A model is generated of the axial distribution of the horizontal and vertical conductivities, from induction signals acquired by the instrument using two-frequency alternating current. The model is generated by calculating an initial estimate of the conductivity distribution and axially inverting the estimate with respect to the measurements made using the two-frequency alternating current. Shoulder correction is applied to measurements made by the instrument using single-frequency alternating current. An estimate of the radial distribution of the conductivities is generated from the shoulder corrected induction signals acquired using the single-frequency alternating current. A 2-dimensional model is made of the conductivity distribution from the model of axial distribution and from the estimate of radial distribution. The two-frequency induction signals are corrected for near wellbore effects using two-frequency whole space responses calculated using the 2-dimensional model. The corrected two-frequency signals are then axially inverted to generate a 2-dimensional model. Using the corrected two-frequency signals in place of the acquired signals, all the previous steps are repeated until differences between the corrected two-frequency induction signals from successive repetitions (iterations) of the steps fall below a predetermined threshold. The two-dimensional model extant when process is halted becomes the final two-dimensional model.
摘要翻译：使用横向电磁感应测井仪测量的确定井筒周围地球地层水平和垂直电导率二维分布的方法。从使用双频交流电的仪器获取的感应信号产生水平和垂直电导率轴向分布的模型。该模型通过计算电导率分布的初始估计并相对于使用双频交流电流进行的测量轴向反转估计而产生。肩部矫正适用于使用单频交流电的仪器进行的测量。电导率的径向分布的估计是从使用单频交流电获得的肩部校正的感应信号产生的。二维模型由轴向分布模型和径向分布估计的电导率分布组成。使用使用二维模型计算的双频整体空间响应来校正近似井眼效应的双频感应信号。然后校正的两个频率信号被轴向反转以产生二维模型。使用校正的双频信号代替获取的信号，重复所有先前的步骤，直到来自步骤的连续重复（迭代）的校正的双频感应信号之间的差值降至预定阈值以下。当过程停止时，存在的二维模型成为最终的二维模型。

7. 发明授权

US06952101B2 Method for determining direction to a target formation from a wellbore by analyzing multi-component electromagnetic induction signals 有权
标题翻译：通过分析多分量电磁感应信号，从井眼确定目标地层方向的方法
公开(公告)号：US06952101B2
公开(公告)日：2005-10-04
申请号：US10345506
申请日：2003-01-16
申请人： Pravin Gupta
发明人： Pravin Gupta
IPC分类号： E21B47/022 , G01V3/30 , G01V3/12
CPC分类号： G01V3/30 , E21B47/02216
摘要： A method is disclosed for determining a direction of a target formation with respect to an instrument in a wellbore. The target has an electrical conductivity different than earth formations surrounding the wellbore. The method includes inducing time varying electromagnetic fields in the formations surrounding the wellbore. The electromagnetic fields have at least some components along mutually orthogonal directions. Voltages induced by the time varying electromagnetic fields are detected. The detecting is performed to have at least some component along mutually orthogonal directions. The direction of the target is calculated from the detected voltages.
摘要翻译：公开了一种用于确定相对于井眼中的仪器的目标地层的方向的方法。目标具有不同于围绕井筒的地层的导电性。该方法包括在围绕井眼的地层中诱发时变电磁场。电磁场沿着相互正交的方向具有至少一些分量。检测由时变电磁场引起的电压。执行检测以沿着相互正交的方向具有至少一些分量。从检测到的电压计算目标的方向。

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