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公开(公告)号：US20220035064A1
公开(公告)日：2022-02-03
申请号：US17443619
申请日：2021-07-27
摘要： A system for looking ahead of a drill bit includes a plane wave generator (PWG) tool deployed downhole inside a wellbore for formation evaluation and generation of reflection data, a power source providing electric power to the PWG tool for the formation evaluation and the generation of the reflection data, a surface control system receiving the reflection data from the PWG tool and generating image data of a subsurface rock formation based on the received reflection data, and a wireline that electrically couples the PWG tool to the power source and communicatively couples the PWG tool to the surface control system. The PWG tool includes a beam forming network (BFN) architecture and a plurality of antenna elements mounted to a base of the PWG tool to transmit and receive electromagnetic signals.
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公开(公告)号：US20220025763A1
公开(公告)日：2022-01-27
申请号：US17497457
申请日：2021-10-08
发明人： Michael S. Bittar , Hsu-Hsiang Wu
摘要： A system and a method for a look-ahead drill bit. The system may comprise an ultra-deep transmitter operable to transmit a low frequency signal into a formation, a shallow tool operable to transmit a high frequency signal into the formation, at least one ultra-deep receiver operable to record a reflected low frequency signal, and at least one pair of collocated receivers, wherein the at least one pair of collocated receivers are operable to record a reflected high frequency signal. A method may comprise transmitting a high frequency signal from the shallow tool into the formation, transmitting a low frequency signal from the ultra-deep transmitter into the formation, evaluating the reflected high frequency signal and the reflected low frequency signal on an information handling system with a look-ahead inversion, and steering the bottom hole assembly in the formation based on the subterranean formation property.
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公开(公告)号：US11204438B2
公开(公告)日：2021-12-21
申请号：US16663988
申请日：2019-10-25
发明人： Gong Li Wang , Koji Ito , Xiao Bo Hong
摘要： Properties of a geological formation, such as vertical resistivity values, horizontal resistivity values, dip, and azimuth may be determined by inverting electromagnetic (EM) well log data based at least in part on an anisotropic formation model and a cost function. The cost function may include a data misfit term, a smoothness term, and an entropy term. In some embodiments, one or more of the data misfit term, the smoothness term, and the entropy term may be represented as functions of vertical conductivity and horizontal conductivity. The cost function may include one or more regularization parameters that are based at least in part on the data misfit term. Further, the cost function may include one or more relaxation factors that are based at least in part on a ratio of the Hessians of the smoothness term and the data misfit term.
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公开(公告)号：US11194072B2
公开(公告)日：2021-12-07
申请号：US15771801
申请日：2016-02-16
发明人： Glenn A. Wilson , Burkay Donderici
摘要： A logging system includes an electromagnetic logging tool that collects at least one measurement of a subterranean formation at a borehole. The logging system also includes a processing system that generates a plurality of earth models of the subterranean formation based on the at least one measurement of the subterranean formation. The processing system projects at least one second earth model upon a well path of the borehole, and selects a model of the plurality of models based on a spatial correlation between at least one parameter of the selected model and a corresponding at least one parameter of the at least one second earth model.
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公开(公告)号：US20210349230A1
公开(公告)日：2021-11-11
申请号：US16867053
申请日：2020-05-05
IPC分类号： G01V3/30 , G01V3/34 , G01V3/12 , G01V3/08 , E21B47/0228
摘要： A method for mapping underground sensors onto a network map may include obtaining a plurality of magnetic measurements from a plurality of sensors. The method may include using the plurality of magnetic measurements for determining a plurality of sensor locations in an initial network map. The method may include generating updated network maps from the perspective of each localized sensor. The method may include merging the updated network maps into a final network map, the final network map comprising a most accurate location for each sensor. The method may include determining inner localized sensors out of the plurality of sensors in the final network map. The method may include identifying the inner localized sensors as new base station anchors. The method may include mapping the inner localized sensors onto the final network map as new base station anchors.
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公开(公告)号：US11150377B2
公开(公告)日：2021-10-19
申请号：US16516016
申请日：2019-07-18
摘要： A method is described for subsurface hydrocarbon reservoir characterization including receiving a time-lapse electromagnetic (EM) dataset and a flow dataset; inverting the time-lapse EM dataset using a parametric inversion that models steel well casings to determine a volume of fluid-changed reservoir; inverting the time-lapse EM dataset and the flow dataset using a joint inversion that honors the volume of the fluid-changed reservoir to determine relative permeability and capillary pressure; and characterizing flow characteristics in the volume of the fluid-changed reservoir. The method may be executed by a computer system.
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公开(公告)号：US11149537B2
公开(公告)日：2021-10-19
申请号：US15545246
申请日：2016-09-27
发明人： Baris Guner , Burkay Donderici
IPC分类号： E21B47/0228 , G01V13/00 , G01V3/30 , E21B47/0232 , E21B49/00 , G01V3/20 , G01V3/28 , E21B7/04 , E21B43/24
摘要： A method and electromagnetic ranging system for determining the location of a target well. A method may comprise taking a first measurement with an electromagnetic ranging tool at a first position and calculating a first modeled signal. Additionally, calculating a calibration for the electromagnetic ranging tool from at least the first measurement and the first modeled signal, taking a second measurement with the electromagnetic ranging tool at a second position, and calculating a calibrated measurement. The method may comprise determining a distance, direction, and/or orientation to a target wellbore using at least the calibrated measurement. An electromagnetic ranging system may comprise an electromagnetic ranging tool and an information handling system coupled to the electromagnetic ranging tool. The information handling system may be operable to calibrate the electromagnetic ranging tool, calculate a gain of the electromagnetic ranging tool, and apply the gain to a measured signal from the electromagnetic ranging tool.
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公开(公告)号：US11137515B2
公开(公告)日：2021-10-05
申请号：US16464664
申请日：2016-12-30
摘要： Described are tools, systems, and methods for dielectric logging using transient waveforms. In some embodiments, one or more microstrip antennas are employed for the measurements. In various embodiments, the waveforms are processed in the time-domain to determine the dielectric properties of a formation, from which geophysical formation properties can then be derived. Further embodiments are disclosed.
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公开(公告)号：US11125076B1
公开(公告)日：2021-09-21
申请号：US16934585
申请日：2020-07-21
IPC分类号： E21B47/092 , G01P15/105 , G01V3/30
摘要： A method for locating a casing collar in a well is disclosed. The method includes lowering an accelerometer into the well to slide along a casing wall of the well, generating a data log by measuring an accelerometer signal from the accelerometer as the accelerometer slides along the casing wall, analyzing, by a computer processor, the data log with respect to a predetermined data feature to detect an accelerometer signal event, and determining, by the computer processor and based on the accelerometer signal event, a location of the casing collar in the well.
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公开(公告)号：US11119241B2
公开(公告)日：2021-09-14
申请号：US16303206
申请日：2017-06-15
申请人： Well ID AS
发明人： Lars Øy
摘要： A downhole calliper tool is for measuring distance between the calliper tool and an interface in a well, such as a petroleum well or a geothermal well. The downhole calliper tool has an impulse radar system (of the CTBV-type) with at least one impulse radar unit configured for: a) transmitting electromagnetic pulses with the impulse radar unit in a direction away from the downhole calliper tool, and for b) receiving reflections of said electromagnetic pulses with the impulse radar unit, and for c) analyzing said reflections to determine the distance between the impulse system and the interface. The impulse radar system is designed for carrying out at least one distance determination per second, but preferably at least ten distance determinations per second.
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