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1. 发明授权

US5721491A Determining electrical conductivity of an earth layer 失效
标题翻译：确定地球层的导电性
公开(公告)号：US5721491A
公开(公告)日：1998-02-24
申请号：US566249
申请日：1995-12-01
申请人： Melis Van Der Horst
发明人： Melis Van Der Horst
IPC分类号： G01N27/04 , G01N27/72 , G01V3/28 , G01V3/10
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, whereby a wellbore containing a wellbore fluid extends through said formation. The method includes lowering an induction logging tool into the wellbore to a location surrounded by a selected one of the earth layers, the tool including a magnetic field transmitter suitable to induce magnetic fields of different frequencies in said earth layers, and magnetic field receiver suitable to receive response magnetic fields at different spacings from the transmitter and to provide a signal representative of each response magnetic field. At least two of the different frequencies and at least two of the different spacings are selected, and for different combinations of each selected frequency and each selected spacing, the transmitter is operated so as to induce a magnetic field of the selected frequency in said earth layers, which magnetic field induces a corresponding response magnetic field near the tool. The receiver is operated at the selected spacing from the transmitter so as to provide a signal representing the response magnetic field. 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 and the electric conductivity of an earth layer adjacent the selected layer.
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，由此包含井筒流体的井筒延伸穿过所述地层。该方法包括将感应测井工具降低到井眼中至由选定的一个地球层包围的位置，该工具包括适于在所述地层中诱导不同频率的磁场的磁场发射器，以及适于接收与发射机不同间隔的响应磁场，并提供表示每个响应磁场的信号。选择不同频率和至少两个不同间隔中的至少两个，并且对于每个选择的频率和每个选择的间隔的不同组合，操作发射机以便在所述地层中引起所选频率的磁场，该磁场在工具附近引起相应的响应磁场。接收机以与发射机的选定间隔操作，以便提供表示响应磁场的信号。以这样的方式组合信号，以便产生对井眼区域中的电导率的依赖性降低以及邻近选定层的地球层的电导率的组合信号。

2. 发明授权

US06449561B1 Induction logging 有权
标题翻译：感应测井
公开(公告)号：US06449561B1
公开(公告)日：2002-09-10
申请号：US09532673
申请日：2000-03-21
申请人： Richard Gerrit Hakvoort , Melis van der Horst
发明人： Richard Gerrit Hakvoort , Melis van der Horst
IPC分类号： G01V318
CPC分类号： G01V3/28 , G01V3/38
摘要： A method of providing a computed induction log of an induction logging tool run through an interval of a wellbore that extends through a layered formation invaded by wellbore fluid. The method comprises computing a first response of the induction logging tool by solving for each formation layer the Maxwell equations for the electromagnetic field using a one-dimensional concentric cylinder model not taking into account the effects of formation layering and of the orientation of the logging tool with respect to the formation layering, and determining for each formation layer an equivalent resistivity that gives for a homogeneous environment a response of the induction logging tool that equals the first response; and solving for a number of logging points the Maxwell equations using a one-dimensional layered model using the equivalent resistivities as computed in step wherein the effects of the formation layering and of the orientation of the logging tool with respect to the formation layering are taken into account, to provide the computed induction log of the induction logging tool.
摘要翻译：提供感应测井工具的计算感应对流的方法，该感应测井工具穿过穿过由井眼流体侵入的分层地层的井眼的间隔。该方法包括通过使用不考虑地层分层的影响和测井工具的取向的一维同心圆筒模型，求解每个地层，求解电磁场的麦克斯韦方程，来计算感应测井工具的第一响应并且为每个形成层确定等效电阻率，其给出均匀环境下的感应测井工具的响应等于第一响应; 并且使用如下步骤中计算的等效电阻率使用一维分层模型求解多个测井点的麦克斯韦方程，其中将地层分层和测井工具相对于地层分层的取向的影响置于帐户，以提供感应测井工具的计算感应日志。

3. 发明授权

US6147496A Determining electrical conductivity of a laminated earth formation using induction logging 失效
标题翻译：使用感应测井确定层压地层的导电性
公开(公告)号：US6147496A
公开(公告)日：2000-11-14
申请号：US886725
申请日：1997-07-01
申请人： Kurt-Martin Strack , Leonty Abraham Tabarovsky , David Ronald Bear , Melis van der Horst
发明人： Kurt-Martin Strack , Leonty Abraham Tabarovsky , David Ronald Bear , Melis van der Horst
IPC分类号： G01V3/28 , G01V3/10 , G01V3/18 , G06F19/00
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。

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