公开(公告)号：US07109719B2

公开(公告)日：2006-09-19

申请号：US10842828

申请日：2004-05-11

申请人： Antonio Fabris ,  Rashid Khokhar

发明人： Antonio Fabris ,  Rashid Khokhar

IPC分类号： G01V3/18 ,  G01V3/26

CPC分类号： G01V3/20

摘要： An azimuthal resistivity logging tool includes one or more pads for making azimuthal resistivity measurements of earth formation. Current from the pads, guard electrodes and a measure electrode are measured while monitoring the voltage difference between pairs of monitor electrodes. The pads and an adjacent portion of the tool body form a guard electrode. In addition, microelectrodes are provided on the pads for obtaining high resolution resistivity measurements.

摘要翻译： 方位电阻率测井工具包括一个或多个用于进行地层电阻率测量的焊盘。 测量来自焊盘，保护电极和测量电极的电流，同时监测成对的监视电极之间的电压差。 焊盘和工具主体的相邻部分形成保护电极。 此外，在焊盘上提供微电极以获得高分辨率电阻率测量。

公开(公告)号：US20050253589A1

公开(公告)日：2005-11-17

申请号：US10842828

申请日：2004-05-11

申请人： Antonio Fabris ,  Rashid Khokhar

发明人： Antonio Fabris ,  Rashid Khokhar

IPC分类号： G01V3/10 ,  G01V3/18 ,  G01V3/20

CPC分类号： G01V3/20

摘要： A resistivity logging tool includes one or more pads for making azimuthal resistivity measurements of earth formation. Current from the pads, guard electrodes and a measure electrode are measured while monitoring the voltage difference between pairs of monitor electrodes. In addition, microelectrodes are provided on the pads for obtaining high resolution resistivity measurements.

摘要翻译： 电阻率测井工具包括一个或多个用于进行地球形成方位电阻率测量的焊盘。 测量来自焊盘，保护电极和测量电极的电流，同时监测成对的监视电极之间的电压差。 此外，在焊盘上提供微电极以获得高分辨率电阻率测量。

公开(公告)号：US06801039B2

公开(公告)日：2004-10-05

申请号：US10142307

申请日：2002-05-09

申请人： Antonio Fabris ,  Rashid Khokhar

发明人： Antonio Fabris ,  Rashid Khokhar

IPC分类号： G01V318

CPC分类号： G01V3/28

摘要： A mud resistivity measuring device for use in a borehole includes a pair of current electrodes disposed between a pair of guard electrodes. The measure electrodes are carried on a recessed portion of a logging tool so that the measure current flows substantially along the borehole axis and is relatively insensitive to the formation resistivity. A pair of measure electrodes on the logging tool determines a voltage difference caused by the current flow in the borehole.

摘要翻译： 用于井眼的泥浆电阻率测量装置包括设置在一对保护电极之间的一对电流电极。 测量电极承载在测井工具的凹陷部分上，使得测量电流基本上沿钻孔轴线流动，并且对地层电阻率相对不敏感。 测井工具上的一对测量电极确定由钻孔中的电流引起的电压差。

公开(公告)号：US6154704A

公开(公告)日：2000-11-28

申请号：US193448

申请日：1998-11-17

申请人： Zeljko Jericevic ,  Antonio Fabris

发明人： Zeljko Jericevic ,  Antonio Fabris

IPC分类号： E21B47/04 ,  G06F19/00

CPC分类号： E21B47/04

摘要： A method for correcting data measured by a well logging instrument for effects of cable yo-yo. The data are first preprocessed to reduce magnitude of spatial frequency components in the data occurring within a bandwidth of axial acceleration of the logging instrument which corresponds to the cable. Then eigenvalue, of a matrix are shifted, over depth intervals where the smallest absolute value one of the eigenvalues changes sign, by an amount such that the smallest absolute value eigenvalue does not change sign. The matrix forms part of a system of linear equations by which the measurements made by the instrument are converted to values of a property of interest of earth formations. Artifacts which may remain in the data after the step of preprocessing are substantially removed by the eigenvalue shifting. In one embodiment, the step of preprocessing includes low pass filtering using a cutoff at the axial resolution limit of a sensor on the instrument. In another embodiment, preprocessing includes phase shifting the response of one sensor to another sensor on the instrument within the spatial frequency bandwidth of the cable yo-yo. Still another embodiment of preprocessing include phase synthesis of the response of one sensor to that of another sensor within the spatial frequency bandwidth of the cable yo-yo.

摘要翻译： 一种用于校正测井仪器测量的数据的方法，以测量电缆溜溜球的影响。 首先对数据进行预处理，以减少在对应于电缆的测井仪器的轴向加速度的带宽内发生的数据中的空间频率分量的幅度。 然后，矩阵的特征值在特征值中的最小绝对值改变符号的深度间隔上移动一定量，使得最小绝对值特征值不改变符号。 该矩阵形成线性方程组的一部分，通过该系统将仪器进行的测量转换为地球地层感兴趣的性质的值。 在预处理步骤之后可能残留在数据中的伪像基本上被特征值偏移除去。 在一个实施例中，预处理步骤包括使用仪器上的传感器的轴向分辨率极限处的截止值进行低通滤波。 在另一个实施例中，预处理包括在电缆溜溜球的空间频率带宽内将一个传感器的响应相移到仪器上的另一个传感器。 预处理的另一个实施例包括在电缆溜溜球的空间频率带宽内将一个传感器的响应相对于另一传感器的响应相位合成。

公开(公告)号：US5585727A

公开(公告)日：1996-12-17

申请号：US373409

申请日：1995-01-17

申请人： Otto N. Fanini ,  Antonio Fabris

发明人： Otto N. Fanini ,  Antonio Fabris

IPC分类号： G01V3/24 ,  G01V3/10

CPC分类号： G01V3/24

摘要： An apparatus for measuring resistivity of an earth formation. The apparatus includes at least one source of measuring current. The source includes a delta-sigma modulator and a serial bit source coupled to the modulator. The serial bit source represents the magnitude of the measuring current at spaced apart time intervals. The apparatus includes a sensor responsive to formation current resulting from interaction of the measure current with the earth formation. The sensor is coupled to a sigma-delta modulator. The modulator is coupled to a digital mixer and a digital filter. The output of the digital filter corresponds to the magnitude of the measure current detected by the sensor sampled at spaced apart time intervals. In a preferred embodiment, the apparatus includes a plurality of current sources each having a different frequency. The sigma-delta modulator is coupled to a plurality of mixers each for demodulating one of the different source frequencies.

摘要翻译： 一种用于测量地层电阻率的装置。 该装置包括至少一个测量电流源。 源包括Δ-Σ调制器和耦合到调制器的串行位源。 串行位源以间隔开的时间间隔表示测量电流的大小。 该装置包括响应于测量电流与地层相互作用而产生的地层电流的传感器。 传感器耦合到Σ-Δ调制器。 调制器耦合到数字混频器和数字滤波器。 数字滤波器的输出对应于由间隔开的时间间隔采样的传感器检测的测量电流的大小。 在优选实施例中，该装置包括多个电流源，每个电流源具有不同的频率。 Σ-Δ调制器耦合到多个混频器，每个混频器用于解调不同的源频率之一。

公开(公告)号：US6060886A

公开(公告)日：2000-05-09

申请号：US7159

申请日：1998-01-14

申请人： Leonty A. Tabarovsky ,  Antonio Fabris ,  Alberto G. Mezzatesta ,  Gregory B. Itskovich

发明人： Leonty A. Tabarovsky ,  Antonio Fabris ,  Alberto G. Mezzatesta ,  Gregory B. Itskovich

IPC分类号： G01V3/24 ,  G01V3/18

CPC分类号： G01V3/24

摘要： An apparatus for determining radial distribution of resistivity of earth formations surrounding a wellbore. The apparatus includes a sonde mandrel having an insulating exterior surface and electrodes disposed on the insulating surface at spaced apart locations. The electrodes are connected to circuits for measuring a focused current resistivity within a predetermined longitudinal span. The electrodes are also connected to circuits for measuring electrical impedance between pairs of electrodes spaced apart at a plurality of different longitudinal spacings. The preferred embodiment includes a voltage measuring circuit interconnected between a pair of electrodes which is positioned between a closest spaced pair of electrodes connected to the impedance measuring circuits, so that a vertical resolution of the impedance measurements can be limited to approximately the axial spacing of the pair of electrodes connected to the voltage measuring circuit. A method according to the invention for determining the distribution of resistivity of earth formations surrounding a wellbore includes the steps of measuring a focused current resistivity of the earth formations to determine a composite resistivity of an uninvaded zone, an invaded zone and a flushed zone. Impedance is measured between pairs of electrodes, each pair having a different longitudinal spacing, and resistivity of the flushed zone and the invaded zone are determined from the measurements of impedance. The resistivity of the uninvaded zone can then be determined from the measurement of focused current resistivity.

摘要翻译： 一种用于确定井筒周围的地层的电阻率的径向分布的装置。 该设备包括具有绝缘外表面的探头心轴和在间隔开的位置处设置在绝缘表面上的电极。 电极连接到用于测量预定纵向跨度内的聚焦电流电阻率的电路。 电极还连接到用于测量以多个不同纵向间隔间隔开的电极对之间的电阻抗的电路。 优选实施例包括互连在一对电极之间的电压测量电路，该对电极位于连接到阻抗测量电路的最近间隔的一对电极之间，使得阻抗测量的垂直分辨率可以被限制在近似于 一对电极连接到电压测量电路。 根据本发明的用于确定围绕井筒的地层的电阻率分布的方法包括以下步骤：测量地层的聚焦电流电阻率以确定未浸没区域，入侵区域和冲洗区域的复合电阻率。 电阻对之间测量阻抗，每对电极具有不同的纵向间隔，并且从阻抗的测量值确定冲洗区域和入侵区域的电阻率。 然后可以从聚焦电流电阻率的测量来确定非浸没区域的电阻率。

公开(公告)号：US6060885A

公开(公告)日：2000-05-09

申请号：US874218

申请日：1997-06-13

申请人： Leonty A. Tabarovsky ,  Antonio Fabris ,  Alberto G. Mezzatesta

发明人： Leonty A. Tabarovsky ,  Antonio Fabris ,  Alberto G. Mezzatesta

IPC分类号： G01V3/22 ,  G01V3/18

CPC分类号： G01V3/22

摘要： A differential array instrument for determining selected parameters of an earth formation surrounding a borehole, including an instrument mandrel carrying a single source electrode for injecting an electrical current of a predetermined value into the formation surrounding the borehole, and an array of a plurality of measurement electrodes uniformly and vertically spaced from said source electrode along the instrument mandrel. A predetermined group of the uniformly and vertically spaced electrodes are adapted to derive first and second difference potentials between the predetermined group of electrodes, wherein successive ones of a plurality of the predetermined group of selected measuring electrodes uniformly and vertically spaced at increasing distances from the source electrode axially of the borehole are adapted to derive a plurality of the first and second difference potentials between the predetermined group of electrodes. The first and second difference potentials are derived in response to current from the source electrode travelling generally vertically in an orientation generally parallel to the axis of the borehole in the formation to successive ones of the predetermined groups of selected measuring electrodes and which plurality of first and second difference potentials may be correlated to a plurality of values representative of the selected formation parameters. The plurality of values representative of the selected formation parameters may provide a profile of the selected parameters over an increasing radial distance from the borehole.

摘要翻译： 用于确定围绕钻孔的地层的选定参数的差分阵列仪器，包括承载用于将预定值的电流注入到钻孔周围的地层中的单个源电极的仪器心轴和多个测量电极的阵列 沿着仪器心轴与所述源电极均匀且垂直地间隔开。 均匀和垂直间隔开的电极的预定组适于导出预定电极组之间的第一和第二差电位，其中多个预定组的选定测量电极中的连续的电极以均匀且垂直方向间隔开距离源 钻孔轴向的电极适于导出预定电极组之间的多个第一和第二差电位。 第一和第二差异电位是响应来自源电极的电流导出的，所述电流大致垂直地沿着大致平行于地层中的钻孔的轴线的定向行进到所选择的测量电极的预定组中的连续的一个，并且多个第一和第 第二差分电位可以与表示所选择的地层参数的多个值相关。 代表所选择的地层参数的多个值可以在距钻孔的增加的径向距离上提供所选参数的轮廓。