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公开(公告)号：US12105245B1
公开(公告)日：2024-10-01
申请号：US18410865
申请日：2024-01-11
发明人： Qihui Zhen , Qingyun Di , Yuliang Wang , Quanmin Yang
摘要： A ground receiving front-end compensation system for intelligent guide drilling borehole-ground electromagnetic transmission is provided, and includes a ground sensing module located below the underground wellhead, a ground system located between the underground wellhead and the measuring electrode, a measuring electrode and a compensation electrode; the ground system, the measuring electrode and the compensation electrode are located at the same side of the underground wellhead, a measuring electrode spacing (a first preset distance) is a distance from the underground wellhead to the measuring electrode; a compensation electrode spacing (a second preset distance) is a distance from the underground wellhead to the compensation electrode, the second preset distance is greater than the first preset distance; an induction signal of the ground sensing module enters the ground system, and the ground system outputs compensation current based on the induction signal, and compensates the measuring signal based on the compensation current.
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公开(公告)号：US20240219600A1
公开(公告)日：2024-07-04
申请号：US18397859
申请日：2023-12-27
发明人： Hsu-Hsiang Wu , Jin Ma , Yi Jing Fan
摘要： A method and/or system comprising: disposing a bottom hole assembly into a wellbore, wherein the bottom hole assembly comprises: a transmitter sub comprising a transmitter coil; a first receiver sub comprising a first receiver coil; transmitting an electromagnetic wave into a subterranean formation with the transmitter coil; receiving a plurality of response signals with the first receiver coil, wherein the plurality of response signals are from two or more depths and are formed from the electromagnetic wave interacting with the subterranean formation. Additionally, the method and/or system may be configured to analyze a gradient of the response signals to determine if the gradient exceeds a threshold, wherein the threshold indicates a presence of a fracture or fault.
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3.发明公开公开(公告)号：US20240061140A1
公开(公告)日：2024-02-22
申请号：US18494292
申请日：2023-10-25
IPC分类号： G01V3/28 , E21B47/113 , E21B47/06 , E21B49/08 , G01V3/30
CPC分类号： G01V3/28 , E21B47/113 , E21B47/06 , E21B49/08 , G01V3/30 , E21B49/008
摘要： The present device and technique relates to measuring geological formation permeability, such as by injection/withdrawal of conductivity-permeability doped fluid and measuring the magnetic permeability and/or conductivity of the surrounding formation. Before, during and/or after injection or withdrawal, pluralities of electromagnetic measurements of the radial distribution of magnetic permeability and/or conductivity of the surrounding formation may be made. The rate of change of the radial distribution of magnetic permeability and/or conductivity of the formation is generally directly proportional to the permeability of the surrounding formation. In implementations, magnetic permeability and electrical conductivity can be measured independently in time domain or frequency domain, such that the magnetic permeability mapping is not disturbed by other confounding electromagnetic parameters.
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公开(公告)号：US20240027644A1
公开(公告)日：2024-01-25
申请号：US18114093
申请日：2023-02-24
摘要： A method and system for azimuthal direction detection of a cable. The method may comprise disposing an electromagnetic logging tool into a wellbore, transmitting a primary electromagnetic field from the one or more transmitters, recording one or more secondary electromagnetic fields at the one or more receivers, and identifying a direction to the cable from the one or more secondary electromagnetic fields. The system may comprise one or more transmitters disposed on the electromagnetic logging tool and configured to transmit a primary electromagnetic field. The system may further comprise one or more receivers disposed on the electromagnetic logging tool and configured to record one or more secondary electromagnetic fields. Additionally, the system may further comprise an information handling system configured to identify a direction to an azimuthally localized reduction in metal of the conductor or increase in the metal of the conductor from the secondary electromagnetic fields.
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5.发明授权公开(公告)号：US11835675B2
公开(公告)日：2023-12-05
申请号：US16988434
申请日：2020-08-07
CPC分类号： G01V3/28 , E21B47/06 , E21B47/113 , E21B49/08 , G01V3/30 , E21B49/008
摘要： The present device and technique relates to measuring geological formation permeability, such as by injection/withdrawal of conductivity-permeability doped fluid and measuring the magnetic permeability and/or conductivity of the surrounding formation. Before, during and/or after injection or withdrawal, pluralities of electromagnetic measurements of the radial distribution of magnetic permeability and/or conductivity of the surrounding formation may be made. The rate of change of the radial distribution of magnetic permeability and/or conductivity of the formation is generally directly proportional to the permeability of the surrounding formation. In implementations, magnetic permeability and electrical conductivity can be measured independently in time domain or frequency domain, such that the magnetic permeability mapping is not disturbed by other confounding electromagnetic parameters.
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公开(公告)号：US11814945B2
公开(公告)日：2023-11-14
申请号：US17530556
申请日：2021-11-19
发明人： Ahmed Fouda , Junwen Dai
CPC分类号： E21B47/00 , F16L55/28 , G01V3/28 , G01V3/38 , E21B2200/20
摘要： Electromagnetic logging tools to inspect nested pipes using hybrid frequency- and time-domain logging techniques are disclosed. The disclosed logging system and processing workflows combine frequency-domain and time-domain techniques to overcome the disadvantages of using frequency-domain or time domain tools in isolation.
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公开(公告)号：US20230305181A1
公开(公告)日：2023-09-28
申请号：US17851348
申请日：2022-06-28
发明人： Guoyun GUAN , Min MENG , Jun HU , Zaiping NIE
摘要： A method of reducing or rejecting common mode interference and a circuit for electromagnetic induction logging with improved common mode interference reduction or rejection are disclosed, which are useful in the field of electromagnetic induction logging technology. Accurate formation signals are calculated based on phases and amplitudes of common mode signals, which do not change with the coil access mode, and phases of differential signals, which are reversed with amplitudes unaltered when the coil is connected reversely. This provides a mechanism to effectively eliminate the influence of common mode interference even when the common mode interference is greater in amplitude than the signals from a geological formation.
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公开(公告)号：US11692437B2
公开(公告)日：2023-07-04
申请号：US16961885
申请日：2019-01-31
发明人： Matthew Chase Griffing , Jin Ma , Michael Bittar
CPC分类号： E21B47/12 , G01V3/28 , G01V11/002
摘要： A method of fabricating a ferrite for use in a resistivity logging tool includes providing an uncured ferrite material, and pressing the uncured ferrite material into a channel to form the ferrite. The channel is defined on a surface of a bobbin associated with the resistivity logging tool, and the channel can be arcuate and extend at an angle offset from a central axis of the bobbin. The uncured ferrite material is then cured in place within the channels on the bobbin.
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公开(公告)号：US20230184991A1
公开(公告)日：2023-06-15
申请号：US17999067
申请日：2021-06-21
发明人： Kong Hauw Sarwa Bakti Tan , Qingyan He , Qing Zhang , Desheng Zhang , Kent Harms , Daniel Fernandez
摘要： A method for calibrating an electromagnetic measurement tool includes deploying a test loop about a first antenna in the electromagnetic measurement tool and electromagnetically coupling the test loop and the first antenna and measuring a first voltage. The test loop is then deploying about a second antenna in the electromagnetic measurement tool and electromagnetic ally coupling the test loop and the second antenna and measuring a second voltage. A ratio of the first voltage to the second voltages is computed that can be used to calibrate the first antenna with respect to the second antenna.
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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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