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公开(公告)号：US08212568B2
公开(公告)日：2012-07-03
申请号：US12758276
申请日：2010-04-12
CPC分类号： G01V3/24
摘要： An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an oscillatory electric field in a borehole wall. A voltage drop across a segment of the borehole wall is measured by two voltage electrodes, and the differential voltage is used in combination with a measured current flow to determine a resistivity value for the borehole wall. A common mode voltage in front of the two voltage electrodes is measured and minimized by controlling the excitation source, thereby reducing the resistivity measurement error.
摘要翻译： 一种用于最小化共模电压信号在井下测井工具中的影响的装置和方法，用于确定井眼壁的相邻部分的电阻率。 两个电流电极由激发源激励以在井壁中产生振荡电场。 通过两个电压电极测量穿过井壁的段的电压降，并且将差分电压与测量的电流结合使用以确定井壁的电阻率值。 通过控制激励源来测量和最小化两个电压电极前面的共模电压，从而降低电阻率测量误差。
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公开(公告)号：US07888941B2
公开(公告)日：2011-02-15
申请号：US12065292
申请日：2006-11-06
CPC分类号： G01V3/24
摘要： Oil-based mud imaging systems and methods that measure formation permittivity. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the voltage electrodes to determine a differential voltage magnitude and phase. From the magnitude and phase, formation resistivity and permittivity measurements can be determined and used to construct a borehole wall image.
摘要翻译： 石油泥浆成像系统和测量地层介电常数的方法。 在一些实施例中，公开的记录系统包括与表面计算设备通信的测井工具。 记录工具设置有传感器阵列，其具有位于至少两个电流电极之间的至少两个电压电极，其在井壁中产生电场，并且还设置有耦合到电压电极的电子线以确定差分电压幅度，以及 相。 从大小和相位来看，可以确定地层电阻率和介电常数测量结果，并用于构造井壁图像。
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公开(公告)号：US07579841B2
公开(公告)日：2009-08-25
申请号：US11469859
申请日：2006-09-02
申请人： Luis E. San Martin , Humberto E. Rosa , Raj Pai , William J. Schaecher , Myrick L. Monroe , Marian L. Morys , Carl Dodge
发明人： Luis E. San Martin , Humberto E. Rosa , Raj Pai , William J. Schaecher , Myrick L. Monroe , Marian L. Morys , Carl Dodge
CPC分类号： G01V3/24
摘要： Oil-based mud imaging systems and methods having standoff compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between two current electrodes energized by an excitation source to create an oscillatory electric field in a borehole wall. The two current electrodes are each shielded with conductive shields to prevent current leakage into the logging tool body. A common mode voltage is measured, and the phase and amplitude of the excitation source is controlled to reduce the difference between the common mode voltage and reference voltage of a voltage detector. The logging tool is further provided with electronics coupled to the voltage detector and the current electrodes to determine a differential voltage between the voltage electrodes and two current flows from separate ones of the current electrodes. From the differential voltage and multiple current flows, the computing facilities determine borehole wall resistivity, and may display the resistivity as a borehole wall image.
摘要翻译： 油基泥浆成像系统和方法具有间隙补偿。 在一些实施例中，公开的记录系统包括与表面计算设备通信的测井工具。 记录工具设置有传感器阵列，其具有位于两个电流电极之间的至少两个电压电极，两个电流电极由激励源激励以在井壁中产生振荡电场。 两个电流电极各自用导电屏蔽屏蔽，以防止电流泄漏到测井工具主体中。 测量共模电压，并且控制激励源的相位和幅度以减小电压检测器的共模电压和参考电压之间的差。 测井工具还设置有耦合到电压检测器和电流电极的电子器件，以确定电压电极之间的差分电压和来自分离的电流电极的两个电流。 从差分电压和多个电流流出，计算设备确定井壁电阻率，并可以将电阻率显示为井壁图像。
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公开(公告)号：US20080272789A1
公开(公告)日：2008-11-06
申请号：US12065292
申请日：2006-11-06
IPC分类号： G01V3/26
CPC分类号： G01V3/24
摘要： Oil-based mud imaging systems and methods that measure formation permittivity. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the voltage electrodes to determine a differential voltage magnitude and phase. From the magnitude and phase, formation resistivity and permittivity measurements can be determined and used to construct a borehole wall image.
摘要翻译： 石油泥浆成像系统和测量地层介电常数的方法。 在一些实施例中，公开的记录系统包括与表面计算设备通信的测井工具。 记录工具设置有传感器阵列，其具有位于至少两个电流电极之间的至少两个电压电极，其在井壁中产生电场，并且还设置有耦合到电压电极的电子线以确定差分电压幅度，以及 相。 从大小和相位来看，可以确定地层电阻率和介电常数测量结果，并用于构造井壁图像。
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5.发明申请公开(公告)号：US20080252296A1
公开(公告)日：2008-10-16
申请号：US12088061
申请日：2006-12-11
CPC分类号： G01V3/24
摘要： Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image.
摘要翻译： 油泥成像系统和方法具有漏电流补偿。 在一些实施例中，公开的记录系统包括与表面计算设备通信的测井工具。 记录工具设置有传感器阵列，其具有位于至少两个电流电极之间的至少两个电压电极，其在井壁中产生电场，并且还设置有耦合到电流电极的电子线以确定 电压电极响应于来自当前电极的不同电流频率。 根据不同频率的电压测量，计算设备确定井壁电阻率作为深度和方位角的函数，并可以将电阻率显示为井壁图像。
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公开(公告)号：US07696756B2
公开(公告)日：2010-04-13
申请号：US11422135
申请日：2006-06-05
IPC分类号： G01V3/18
CPC分类号： G01V3/24
摘要： An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an oscillatory electric field in a borehole wall. A voltage drop across a segment of the borehole wall is measured by two voltage electrodes, and the differential voltage is used in combination with a measured current flow to determine a resistivity value for the borehole wall. A common mode voltage in front of the two voltage electrodes is measured and minimized by controlling the excitation source, thereby reducing the resistivity measurement error.
摘要翻译： 一种用于最小化共模电压信号在井下测井工具中的影响的装置和方法，用于确定井眼壁的相邻部分的电阻率。 两个电流电极由激发源激励以在井壁中产生振荡电场。 通过两个电压电极测量穿过井壁的段的电压降，并且将差分电压与测量的电流结合使用以确定井壁的电阻率值。 通过控制激励源来测量和最小化两个电压电极前面的共模电压，从而降低电阻率测量误差。
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7.发明授权公开(公告)号：US08030937B2
公开(公告)日：2011-10-04
申请号：US12088061
申请日：2006-12-11
CPC分类号： G01V3/24
摘要： Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image.
摘要翻译： 油泥成像系统和方法具有漏电流补偿。 在一些实施例中，公开的记录系统包括与表面计算设备通信的测井工具。 记录工具设置有传感器阵列，其具有位于至少两个电流电极之间的至少两个电压电极，其在井壁中产生电场，并且还设置有耦合到电流电极的电子线以确定 电压电极响应于来自当前电极的不同电流频率。 根据不同频率的电压测量，计算设备确定井壁电阻率作为深度和方位角的函数，并可以将电阻率显示为井壁图像。
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公开(公告)号：US20100231225A1
公开(公告)日：2010-09-16
申请号：US12758276
申请日：2010-04-12
IPC分类号： G01V3/20
CPC分类号： G01V3/24
摘要： An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an oscillatory electric field in a borehole wall. A voltage drop across a segment of the borehole wall is measured by two voltage electrodes, and the differential voltage is used in combination with a measured current flow to determine a resistivity value for the borehole wall. A common mode voltage in front of the two voltage electrodes is measured and minimized by controlling the excitation source, thereby reducing the resistivity measurement error.
摘要翻译： 一种用于最小化共模电压信号在井下测井工具中的影响的装置和方法，用于确定井眼壁的相邻部分的电阻率。 两个电流电极由激发源激励以在井壁中产生振荡电场。 通过两个电压电极测量穿过井壁的段的电压降，并且将差分电压与测量的电流结合使用以确定井壁的电阻率值。 通过控制激励源来测量和最小化两个电压电极前面的共模电压，从而降低电阻率测量误差。
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