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1. 再颁专利

USRE42493E1 Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling 有权
标题翻译：使用电容耦合的油基泥浆中井筒电阻率测量的装置和方法
公开(公告)号：USRE42493E1
公开(公告)日：2011-06-28
申请号：US12275398
申请日：2008-11-21
申请人： Leonty Abraham Tabarovsky , Albert Alexy
发明人： Leonty Abraham Tabarovsky , Albert Alexy
IPC分类号： G01V3/20
CPC分类号： G01V3/24
摘要： A resistivity device for downhole use with a nonconducting mud injects a current at a frequency sufficiently high to pass capacitively through the mud and a mud cake into the formation. The frequency is further selected so that the impedance due to the dielectric constant of the formation is small compared to the formation resistivity. Dual frequency measurements may be used to further minimize the effects of the mud and mud cake resistivity. When multiple frequency measurements are used, frequency focusing may be used to get an estimate of formation resistivity that is independent of near borehole effects.
摘要翻译：用于不导电泥浆井下使用的电阻率装置以足够高的频率注入电流，使电容通过泥浆和泥饼进入地层。进一步选择频率，使得由于地层的介电常数导致的阻抗比地层电阻率小。可以使用双频测量来进一步最小化泥浆和泥饼电阻率的影响。当使用多个频率测量时，可以使用频率聚焦来获得独立于近井眼效应的地层电阻率的估计。

2. 发明授权

US06809521B2 Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling 有权
标题翻译：使用电容耦合的油基泥浆中井筒电阻率测量的装置和方法
公开(公告)号：US06809521B2
公开(公告)日：2004-10-26
申请号：US10347019
申请日：2003-01-17
申请人： Leonty Abraham Tabarovsky , Albert Alexy
发明人： Leonty Abraham Tabarovsky , Albert Alexy
IPC分类号： G01V320
CPC分类号： G01V3/24
摘要： A resistivity device for downhole use with a nonconducting mud injects a current at a frequency sufficiently high to pass capacitively through the mud and a mud cake into the formation. The frequency is further selected so that the impedance due to the dielectric constant of the formation is small compared to the formation resistivity. Dual frequency measurements may be used to further minimize the effects of the mud and mud cake resistivity. When multiple frequency measurements are used, frequency focusing may be used to get an estimate of formation resistivity that is independent of near borehole effects.
摘要翻译：用于不导电泥浆井下使用的电阻率装置以足够高的频率注入电流，使电容通过泥浆和泥饼进入地层。进一步选择频率，使得由于地层的介电常数导致的阻抗比地层电阻率小。可以使用双频测量来进一步最小化泥浆和泥饼电阻率的影响。当使用多个频率测量时，可以使用频率聚焦来获得独立于近井眼效应的地层电阻率的估计。

3. 发明授权

US06714014B2 Apparatus and method for wellbore resistivity imaging using capacitive coupling 有权
标题翻译：使用电容耦合进行井筒电阻率成像的装置和方法
公开(公告)号：US06714014B2
公开(公告)日：2004-03-30
申请号：US09836980
申请日：2001-04-18
申请人： Martin Townley Evans , Andrew Richard Burt , Albert Alexy
发明人： Martin Townley Evans , Andrew Richard Burt , Albert Alexy
IPC分类号： G01V320
CPC分类号： G01V3/28 , E21B47/026 , G01V3/24
摘要： An apparatus for obtaining resistivity images of a borehole includes an array of measure electrodes separated from a pad or the body of the instrument by a focusing electrode. The focusing electrode is maintained at a slightly higher potential than the measure electrodes. The apparatus is primarily intended for use with conducting fluids but may also be used with non-conducting fluids. A modulated electrical current with a carrier frequency of 1 MHz is injected into the formation. When used with a non-conducting fluid, capacitive coupling between the electrode and the conductive formation is provided by the dielectric of fluid. When used with a conducting borehole fluid, an additional capacitor may be incorporated into the circuit. The current in the measure electrode is indicative of the conductivity of the formation. To avoid cross-talk between conductors in an isolator section between the current source and the measure electrode, signals indicative of the measure currents are demodulated to a frequency of 1.1 kHz. This makes it possible to use the configuration of prior art devices designed for conductive coupling between the logging tool and the formation.
摘要翻译：用于获得钻孔电阻率图像的装置包括通过聚焦电极与仪器的垫或仪器主体分离的测量电极阵列。聚焦电极保持在比测量电极略高的电位。该装置主要用于导电流体，但也可用于非导电流体。将载波频率为1 MHz的调制电流注入地层。当与非导电流体一起使用时，电极和导电层之间的电容耦合由流体的电介质提供。当与导电钻孔流体一起使用时，可以将另外的电容器并入电路中。测量电极中的电流表示地层的电导率。为了避免电流源和测量电极之间的隔离器部分中的导体之间的串扰，指示测量电流的信号被解调为1.1kHz的频率。这使得可以使用设计用于测井工具和地层之间的导电耦合的现有技术装置的构造。

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