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公开(公告)号：US11630231B2
公开(公告)日：2023-04-18
申请号：US17464386
申请日：2021-09-01
摘要： A downhole tool includes a receive antenna configured to receive a signal from a surrounding formation, and a receive amplifier proximate to and coupled to the receive antenna. The receive amplifier is configured to provide an amplified signal responsive to the signal received by the receive antenna. The downhole tool also includes an electronics carrier, including receive circuitry, coupled to the receive amplifier by a conductor. The electronics carrier is positioned axially away from the receive antenna and the receive amplifier, and the receive circuitry is configured to receive and process the amplified signal.
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公开(公告)号：US20230069300A1
公开(公告)日：2023-03-02
申请号：US17464386
申请日：2021-09-01
摘要： A downhole tool includes a receive antenna configured to receive a signal from a surrounding formation, and a receive amplifier proximate to and coupled to the receive antenna. The receive amplifier is configured to provide an amplified signal responsive to the signal received by the receive antenna. The downhole tool also includes an electronics carrier, including receive circuitry, coupled to the receive amplifier by a conductor. The electronics carrier is positioned axially away from the receive antenna and the receive amplifier, and the receive circuitry is configured to receive and process the amplified signal.
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公开(公告)号：US20230042141A1
公开(公告)日：2023-02-09
申请号：US17394045
申请日：2021-08-04
摘要： An imaging device included in an assembly located in a wellbore during drilling operations may include a cylindrical housing that extends along a central axis thereof. The imaging device may include at least one gradient coil configured to produce a unique magnetic field weaker than a main magnetic field. The at least one gradient coil may create a variable field that is increased or decreased by changing a direction of the unique magnetic field with respect to a direction of the main magnetic field to allow a specific part of a rock formation to be scanned by altering and adjusting the main magnetic field. The imaging device may include at least one radio frequency coil configured to transmit radio frequency waves into the rock formation. The imaging device may include at least one magnet disposed in the cylindrical housing that resonates against the unique magnetic field.
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公开(公告)号：US20230037403A1
公开(公告)日：2023-02-09
申请号：US17392851
申请日：2021-08-03
摘要： A resistivity imaging device and a method of operating the resistivity imaging device in a wellbore. The resistivity imaging device includes a first electrode, a second electrode, and a circuit electrically coupled to the first electrode and the second electrode. An impedance is measured of a formation surrounding the wellbore. Based on the impedance, the circuit is configured into one of a first circuit configuration for operating the resistivity imaging device in a first mode and a second circuit configuration for operating the resistivity imaging device in a second mode. The resistivity imaging device is operated using the circuit in the one of the first circuit configuration and the second circuit configuration.
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公开(公告)号：US20220397695A1
公开(公告)日：2022-12-15
申请号：US17806643
申请日：2022-06-13
发明人： Jin Ma , Clint Lozinsky , Hsu-Hsiang Wu , Yi Jing Fan
摘要： A system and a method for evaluating a subterranean earth formation include a logging tool locatable in a wellbore dispose in the formation. The logging tool may include a transmitter antenna and a single receiver antenna. The transmitter antenna is configured to transmit a first electromagnetic signal into the subterranean earth formation. The system further includes a processor and a non-transitory memory device. The memory device includes instructions that cause the processor to control a current and a voltage sourced to the transmitter antenna, receive, via the single receiver antenna, a second electromagnetic signal emitted by the subterranean earth formation in response to receiving the first electromagnetic signal, and determine a resistivity of the subterranean earth formation based on the second electromagnetic signal.
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公开(公告)号：US11480705B2
公开(公告)日：2022-10-25
申请号：US14061566
申请日：2013-10-23
发明人： Jian Yang
IPC分类号： G01V3/28
摘要： The present disclosure describes various antenna assemblies, each antenna coil being disposed about a tool body section in an antenna pathway. The antenna pathway passes through alternating grooves and lands. In each embodiment, at least one of the grooves is disposed in the tool body section at a non-axial direction relative to the longitudinal axis of the tool body section. In an embodiment, the antenna coil is an axial coil or a tilted coil. Additional grooves oriented at axial direction may be disposed on the tool body section. Each of the antenna assemblies disclosed may be employed in an electromagnetic logging tool for providing directional measurements while drilling.
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公开(公告)号：US11372128B2
公开(公告)日：2022-06-28
申请号：US15931984
申请日：2020-05-14
发明人： Jun Han , Sheng Zhan , Fengtao Hu , Jinhai Zhao
IPC分类号： G01V3/38 , E21B47/0228 , E21B47/07 , E21B47/13 , G01P15/18 , G01V3/28 , G01V7/06 , E21B47/26
摘要： A method and a system implementing the method, are disclosed for computing magnetic interferences in measurement while drilling operations, using the retrieved lateral, and axial magnetic interferences of the measurement while drilling downhole tool system. With the disclosed method and system of implementing the method, it can be determined whether the source of the magnetic interference is from the measurement while drilling downhole tool system lateral direction or its axial direction. When magnetic field strength is abnormal, the lateral and axial magnetic interferences are monitored, and then compared against their values before the abnormal magnetic field strength. This way the direction of the magnetic interference is analyzed to eliminate or judge the cause of the interference, and properly guide the measurement while drilling downhole tool system towards its reservoir or well location.
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公开(公告)号：US11340375B2
公开(公告)日：2022-05-24
申请号：US16120843
申请日：2018-09-04
发明人： Dean M. Homan , John Rasmus , Siddharth Misra
摘要： An electromagnetic measurement tool for making multi-frequency, full tensor, complex, electromagnetic measurements includes a triaxial transmitter and a triaxial receiver deployed on a tubular member. An electronic module is configured to obtain electromagnetic measurements at four or more distinct frequencies. The measurement tool may be used for various applications including obtaining a resistivity of sand layers in an alternating shale-sand formation; computing a dielectric permittivity, a conductivity anisotropy, and/or a permittivity anisotropy of a formation sample; and/or identifying formation mineralization including discriminating between pyrite and graphite inclusions and/or computing weight percent graphite and/or pyrite in the formation sample.
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公开(公告)号：US11320559B2
公开(公告)日：2022-05-03
申请号：US16462162
申请日：2017-01-10
发明人： Michael Bittar , Jin Ma , Hsu-Hsiang Wu
IPC分类号： G01V3/28 , G01V3/10 , H01Q1/04 , H01Q7/08 , H01Q1/46 , G01V3/08 , G01V3/26 , H01Q7/06 , H01Q1/44 , E21B47/00
摘要： An antenna assembly includes a tool mandrel having a tool axis, and a coil including a plurality of windings wrapped about the tool mandrel at a winding angle offset from the tool axis. A soft magnetic band radially interposes the coil and the tool mandrel and extends about a circumference of the tool mandrel at a band angle parallel to the winding angle. The soft magnetic band includes a plurality of stacked inserts extending perpendicular to the coil about the circumference of the tool mandrel and each stacked insert includes a plurality of rods positioned end-to-end.
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公开(公告)号：US11299979B2
公开(公告)日：2022-04-12
申请号：US16815495
申请日：2020-03-11
申请人： Vector Magnetics LLC
发明人： Arthur F. Kuckes , Rahn Pitzer , David Mohler , Mariano S Garcia
IPC分类号： G01V3/00 , E21B47/0228 , G01R33/02 , G01V3/18 , G01V3/26 , G01V3/28 , G01V3/30 , E21B47/022 , E21B47/092 , E21B49/00
摘要： Determining distance and direction from a first borehole to a second borehole including generating a time-varying magnetic field by axially reciprocating magnets of opposed polarity, at a first location in a second borehole, and detectable in the region of the first borehole. First and second sensors positioned at an observation point in the first borehole measure the amplitude and relative phase of components of the magnetic field. From these measurements, the direction, relative to the sensors, from an observation point to the first location is determined. The distance between these points is determined by measuring amplitude variations with depth of the magnetic field at observation points in the first borehole and computing theoretical variations in the amplitude for different assumed distances between the observation points and the location of the magnetic field source which are compared with theoretical variations to determine the distance between the first and second boreholes.
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