-
1.发明授权Real-time 2-dimensional inversion process and its application to induction resistivity well logging 失效实时二维反演过程及其在感应电阻率测井中的应用
公开(公告)号：US5703773A
公开(公告)日：1997-12-30
申请号：US598443
申请日：1996-02-08
摘要： The invention is a method of inversion processing signals from an induction well logging instrument including a transmitter and a plurality of receivers at spaced apart locations. The method includes skin effect correcting the responses of the receivers by extrapolating the receiver responses to zero frequency. A model is generated of the media surrounding said instrument. Conductivities of elements in the model are then adjusted so that a measure of misfit between the skin-effect corrected receiver responses and simulated receiver responses based on the model is minimized. The geometry of the model is then adjusted so that the measure of misfit between the skin-effect corrected receiver responses and the simulated receiver responses based on the model is further minimized. In a preferred embodiment of the invention, the step of adjusting the geometry includes minimizing the measure of misfit between the simulated responses and the receiver responses from selected ones of the receivers closely spaced to the transmitter. Numbers of and positions of radial boundaries are then determined by minimizing the measure of misfit for all the receiver responses.
摘要翻译： 本发明是一种从感应测井仪器反转处理信号的方法，该仪器在间隔开的位置包括发射器和多个接收器。 该方法包括通过将接收机响应外推到零频率来校正接收机的响应的皮肤效应。 产生围绕所述仪器的介质的模型。 然后调整模型中的元素的电导率，使得基于模型的皮肤效应校正的接收器响应和模拟的接收器响应之间的误差测量被最小化。 然后调整模型的几何形状，使得基于模型的皮肤效应校正接收器响应和模拟接收器响应之间的失配度的测量进一步最小化。 在本发明的优选实施例中，调整几何形状的步骤包括最小化模拟响应与接收器响应之间的误差的测量，所述接收机响应与选择的与发射机间隔开的接收机的响应。 然后通过最小化所有接收机响应的误差测量来确定径向边界的数量和位置。
-
公开(公告)号：US06643589B2
公开(公告)日：2003-11-04
申请号：US10091310
申请日：2002-03-05
IPC分类号： G01V318
CPC分类号： G01V3/28
摘要： Measurements made by a multicomponent logging tool in a borehole are inverted to obtain horizontal and vertical resistivities and formation dip and azimuth angles of a formation traversed by the borehole. The inversion is performed using a generalized Marquardt-Levenberg method. In this generalized Marquardt-Levenberg method, a data objective function is defined that is related to a difference between the model output and the measured data. The iterative procedure involves reducing a global objective function that is the sum of the data objective function and a model objective function related to changes in the model in successive iterations. In an alternate embodiment of the invention, the formation azimuth angle is excluded from the iterative process by using derived relations between the multicomponent measurements.
-
3.发明授权Method for automatically calibrating resistivity well logs for effects of change in wellbore diameter and circuit drift 失效自动校准电阻率测井的方法，用于井筒直径和电路漂移变化的影响公开(公告)号：US06353322B1
公开(公告)日：2002-03-05
申请号：US09094220
申请日：1998-06-09
IPC分类号： G01V320
CPC分类号： G01V3/20
摘要： A method for determining the resistivity of earth formations penetrated by a wellbore. Electrical current is imparted to the wellbore and the earth formations from a first electrode located on a mandrel disposed in the wellbore. The electrical current is returned at a second electrode on the mandrel at a spaced apart location from the first electrode. Voltage differences are measured between a first pair and a second pair of electrodes located on the mandrel between the first and the second electrodes. Circuits used to measure the voltage differences are adjusted until the measured voltage difference between the second pair is substantially the same as the measured voltage difference between the first pair. Then the electrical current is returned to an electrode at the earth's surface or other location distal from the first electrode, and measuring the voltage differences is repeated. A difference of the voltage differences is then calculated. The difference of voltage difference represents current leakage into the earth formation substantially unaffected by irregularities in the wall of the wellbore or drift in the circuits. The current leakage is inversely related to the resistivity of the earth formations.
摘要翻译： 一种确定井筒渗透的地层电阻率的方法。 从位于设置在井筒中的心轴上的第一电极向井筒和地层施加电流。 电流在与第一电极间隔开的位置处在心轴上的第二电极处返回。 在位于第一和第二电极之间的心轴上的第一对电极和第二对电极之间测量电压差。 用于测量电压差的电路被调整直到第二对之间的测量电压差基本上与第一对之间的测量电压差相同。 然后电流返回到地球表面或远离第一电极的其他位置处的电极，并且重复测量电压差。 然后计算电压差的差。 电压差的差异表示电流泄漏到地层中，基本上不受井筒壁的不规则或电路中的漂移的影响。 电流泄漏与地层电阻率成反比。
-
4.再颁专利Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling 有权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
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。
-
5.发明授权Apparatus and method for wellbore resistivity measurements in oil-based muds using capacitive coupling 有权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
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。
-
6.发明授权
公开(公告)号：US6147496A
公开(公告)日：2000-11-14
申请号：US886725
申请日：1997-07-01
CPC分类号： G01V3/28
摘要： A method is provided for determining an electric conductivity of an earth formation formed of different earth layers, which earth formation is penetrated by a wellbore containing a wellbore fluid, is provided. The method includes the steps of: lowering an induction logging tool into the wellbore to a location surrounded by a selected one of the earth layers, the tool having a magnetic field transmitter effective to induce magnetic fields of different frequencies in the earth formation, and a magnetic field receiver effective to receive response magnetic fields and to provide a signal representative of each response magnetic field, at least one of the transmitter and the receiver having a plurality of magnetic dipole moments in mutually orthogonal directions. At least two of the different frequencies are selected, and for each selected frequency, the transmitter is operated so as to induce a magnetic field in the earth formation and the receiver is operated so as to provide a signal representing a response magnetic field, wherein the at least one of the transmitter and receiver is operated in the mutually orthogonal directions. The signals are combined in a manner so as to create a combined signal having a reduced dependency on the electric conductivity in the wellbore region. The formation resistivity and the relative orientation of the logging tool with respect to the formation layering is determined from the combined signal.
摘要翻译： 提供了一种用于确定由不同的地层形成的地层的电导率的方法，所述地层由包含井筒流体的井筒穿透而形成。 该方法包括以下步骤：将感应测井工具降低到井眼中到由所选择的一个接地层围绕的位置，所述工具具有有效地诱导地层中不同频率的磁场的磁场发射器，以及 磁场接收器有效地接收响应磁场并提供表示每个响应磁场的信号，发射器和接收器中的至少一个具有在相互正交的方向上的多个磁偶极矩。 选择不同频率中的至少两个，并且对于每个选定的频率，发射机被操作以在地球形成中感应出磁场，并且操作接收机以提供表示响应磁场的信号，其中 发射机和接收机中的至少一个在相互正交的方向上操作。 以这样的方式组合信号，以产生对井眼区域的电导率的依赖性降低的组合信号。 根据组合信号确定测井工具相对于地层分层的地层电阻率和相对取向。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.094 秒)
