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公开(公告)号：US20210270990A1
公开(公告)日：2021-09-02
申请号：US16638513
申请日：2019-04-12
发明人： Jie Yang , Rebecca Jachmann
摘要： Echo signals are acquired from operation of a nuclear magnetic resonance logging (NMR) tool in a borehole. The acquired echo signals are processed with respect to an inversion of each matrix in a plurality of matrices, wherein each matrix in the plurality of matrices accounts for motion of the NMR tool at a respective rate of penetration (ROP) of the NMR tool in the borehole, to produce respective spectrum coefficients for each ROP. Each spectrum is processed with respect to the respective matrices in the plurality of matrices to produce a test echo signal for each ROP. The acquired echo signals and the test echo signal for each ROP are processed to produce an error for each ROP. The ROP for the minimum of the errors is identified as the ROP of the NMR tool.
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公开(公告)号：US11428842B2
公开(公告)日：2022-08-30
申请号：US16638513
申请日：2019-04-12
发明人： Jie Yang , Rebecca Jachmann
摘要： Echo signals are acquired from operation of a nuclear magnetic resonance logging (NMR) tool in a borehole. The acquired echo signals are processed with respect to an inversion of each matrix in a plurality of matrices, wherein each matrix in the plurality of matrices accounts for motion of the NMR tool at a respective rate of penetration (ROP) of the NMR tool in the borehole, to produce respective spectrum coefficients for each ROP. Each spectrum is processed with respect to the respective matrices in the plurality of matrices to produce a test echo signal for each ROP. The acquired echo signals and the test echo signal for each ROP are processed to produce an error for each ROP. The ROP for the minimum of the errors is identified as the ROP of the NMR tool.
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公开(公告)号：US10359485B2
公开(公告)日：2019-07-23
申请号：US15531608
申请日：2014-12-30
发明人： Rebecca Jachmann , Sunghua Chen
摘要： An example method for generating measurements using a downhole tool may comprise generating a magnetic field using a magnetic field source coupled to a tool body. An electromagnetic signal may be transmitted from an antenna coupled to the tool body and around which at least one radial projection is positioned and tilted with respect to a longitudinal axis of the tool body. The method may also include receiving a response to the transmitted electromagnetic signal.
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公开(公告)号：US11891888B2
公开(公告)日：2024-02-06
申请号：US17475574
申请日：2021-09-15
发明人： Songhua Chen , Rebecca Jachmann
IPC分类号： E21B44/00 , E21B47/085 , E21B49/08 , E21B49/00
CPC分类号： E21B44/00 , E21B47/085 , E21B49/005 , E21B49/0875
摘要： A measurement tool may be positioned downhole in a wellbore for measuring formation properties and drilling mud properties during a drilling operation. The measurement tool may include a body and an antenna. The body may include magnets for generating a magnetic field and a transmitter for transmitting a radiofrequency pulse. The antenna may be positioned proximate to the body to measure properties using nuclear magnetic resonant frequencies. The antenna may measure formation properties in a first volume of a formation using a first frequency. The antenna may measure drilling mud properties in a second volume in a borehole using a second frequency.
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公开(公告)号：US20200064285A1
公开(公告)日：2020-02-27
申请号：US16668771
申请日：2019-10-30
发明人： Lilong Li , Rebecca Jachmann , Arcady Reiderman
摘要： A side-looking Nuclear Magnetic Resonance (“NMR”) logging tool is designed to reduce and/or eliminate a borehole signal. The logging tool includes a magnet assembly having at least two magnets with magnetizations in different directions, thus resulting in a net magnetization that reduces the borehole signal.
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公开(公告)号：US10436860B2
公开(公告)日：2019-10-08
申请号：US15506026
申请日：2014-11-12
发明人： Lilong Li , Rebecca Jachmann , Arcady Reiderman
IPC分类号： G01R33/38 , G01R33/341 , G01R33/383 , G01R33/44 , G01V3/32 , G01N24/08
摘要： A side-looking Nuclear Magnetic Resonance (“NMR”) logging tool is designed to reduce and/or eliminate a borehole signal. The logging tool includes a magnetic assembly and a radio frequency (“RF”) transceiver antenna. The axial extent of the RF transceiver antenna has a length selected to reduce a borehole signal.
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公开(公告)号：US20230084875A1
公开(公告)日：2023-03-16
申请号：US17475574
申请日：2021-09-15
发明人： Songhua Chen , Rebecca Jachmann
IPC分类号： E21B44/00 , E21B49/00 , E21B49/08 , E21B47/085
摘要： A measurement tool may be positioned downhole in a wellbore for measuring formation properties and drilling mud properties during a drilling operation. The measurement tool may include a body and an antenna. The body may include magnets for generating a magnetic field and a transmitter for transmitting a radiofrequency pulse. The antenna may be positioned proximate to the body to measure properties using nuclear magnetic resonant frequencies. The antenna may measure formation properties in a first volume of a formation using a first frequency. The antenna may measure drilling mud properties in a second volume in a borehole using a second frequency.
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公开(公告)号：US20200241092A1
公开(公告)日：2020-07-30
申请号：US16652930
申请日：2017-12-29
发明人： Rebecca Jachmann , Arcady Reiderman
IPC分类号： G01R33/38 , G01N24/08 , G01R33/383 , G01R33/3873 , G01V3/32
摘要： Magnetic assemblies for downhole nuclear magnetic resonance tools are provided. A magnetic assembly includes one or more permanent magnets and one or more magnetically permeable structures. The magnetically permeable structures generate an induced magnetic field responsive to the magnetic field of the permanent magnets. The induced magnetic field corrects axial asymmetries in the magnetic field of the permanent magnets. The one or more permanent magnets may be interleaved, in the magnet assembly, with the one or more permanent magnets.
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公开(公告)号：US20170269243A1
公开(公告)日：2017-09-21
申请号：US15319974
申请日：2016-08-11
CPC分类号： G01V1/282 , E21B47/101 , E21B47/14 , G01V1/288 , G01V1/308 , G01V1/40 , G01V1/42 , G01V1/50 , G01V2200/16 , G01V2210/123 , G01V2210/1234 , G01V2210/1299 , G01V2210/1429 , G01V2210/55 , G01V2210/614 , G01V2210/644 , G01V2210/673
摘要： A method including selecting a forward model based on a modeled well structure and including a single modeled acoustic source located in a modeled wellbore and a plurality of modeled acoustic sensors located in a modeled source area, simulating an acoustic signal generated by the single modeled acoustic source and received by each modeled acoustic sensor, calculating phases of the simulated acoustic signals received at each modeled acoustic sensor, obtaining with a principle of reciprocity a plurality of modeled acoustic sources in the modeled source area and a single modeled acoustic sensor in the modeled wellbore, calculating phase delays of the simulated acoustic signals between each modeled acoustic source and the single modeled acoustic sensor, detecting acoustic signals generated by a flow of fluid using acoustic sensors in a wellbore, and processing the acoustic signals using the phase delays to generate a flow likelihood map.
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10.发明申请公开(公告)号：US20160170070A1
公开(公告)日：2016-06-16
申请号：US14436857
申请日：2014-05-06
CPC分类号： G01V3/32 , E21B47/00 , E21B47/122 , G01R33/341 , G01R33/3808
摘要： The magnet and antenna assemblies of a logging tool can be arranged according to geometries optimal for concentric or eccentric well logging operations. In an example configuration, a logging tool can include a magnet, a magnetic core made of a magnetically permeable material, and an antenna. The outward path of the antenna can be positioned along a surface of the magnetically permeable magnetic core that faces away from the magnet, and the return path of the antenna can also be positioned along a surface that faces away from the magnet.
摘要翻译： 测井工具的磁体和天线组件可以根据最适合同心或偏心测井操作的几何形状进行布置。 在示例性配置中，测井工具可以包括磁体，由导磁材料制成的磁芯和天线。 天线的向外的路径可以沿着远离磁体的导磁磁芯的表面定位，并且天线的返回路径也可以沿着远离磁体的表面定位。
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