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41.发明申请公开(公告)号：US20200270987A1
公开(公告)日：2020-08-27
申请号：US15781536
申请日：2017-06-20
摘要： A downhole system includes a first module having a transmitter that transmits at least one sync control signal. The system also includes a second module having a sync module with a direct digital synthesizer (DDS). The sync module analyzes the at least one sync control signal to identify at least one of a sync frequency and a sync phase. The DDS adjusts a local receiver clock based on the identified at least one of a sync frequency and a sync phase.
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公开(公告)号：US10739486B2
公开(公告)日：2020-08-11
申请号：US16146081
申请日：2018-09-28
发明人： Gregory Boris Itskovich , Marina Nikolaevna Nikitenko , Alexander Viktorovich Seryakov , Yinxi Zhang
摘要： Methods and apparatus for determining geo-electrical parameters of an earth formation. Methods include operating a multi-frequency electromagnetic propagation instrument at at least three frequencies; generating synthetic signals of the propagation instrument for a set of models and a set of operating frequencies; perform a 2-dimensional interpolation of the synthetic signals; using first polynomial functions to perform interpolation of the dispersive resistivity; using second polynomial functions to perform interpolation of the dispersive dielectric constant; and performing a multi-parametric scan over the sets of at least 2 resistivity parameters and sets of at least 3 dielectric constant parameters using a multi-dimensional grid of resistivity and dielectric constant values, 2-dimensional interpolation, first polynomial functions, and second polynomial functions to find a combination of first polynomial coefficients and second polynomial coefficients which describe dispersive resistivity and dielectric constant providing a best fit between measured and synthetic data.
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公开(公告)号：US10711602B2
公开(公告)日：2020-07-14
申请号：US15500879
申请日：2015-07-22
IPC分类号： E21B49/00 , E21B47/113 , E21B47/135 , G01V3/28
摘要： A method of monitoring electromagnetic properties of a subsurface formation may include: obtaining a resistivity distribution in the subsurface formation; identifying sensor positions along a borehole; determining an effective resistivity of each region around a sensor position; deriving from the effective resistivities of regions associated with each sensor position an optimum resonance frequency; tuning an array of sensors to provide each sensor with the optimum resonance frequency; deploying the sensor array in the borehole; and collecting electromagnetic field measurements. Each sensor may include: a coil antenna positioned in a subsurface formation having a resistivity, the coil antenna generating a induced voltage signal from an electromagnetic field in the subsurface formation; and a resonant modulation circuit that converts the induced voltage signal into a telemetry signal, the resonant modulation circuit having a resonance frequency optimized for said formation resistivity.
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公开(公告)号：US20200081148A1
公开(公告)日：2020-03-12
申请号：US16453673
申请日：2019-06-26
IPC分类号： G01V3/28 , E21B47/00 , E21B47/024
摘要： A method and system for identifying a deformation. The method may comprise disposing an electromagnetic logging tool in a pipe string, performing a logging operation with the electromagnetic logging tool, transmitting an electromagnetic field from a transmitter, energizing the casing string with the electromagnetic field to produce an eddy current, measuring the eddy current with at least one receiver, processing the measurements of the eddy current to find a point-wise eccentricity between the casing string and the pipe string, identifying a zone with the deformation based at least in part on the point-wise eccentricity, determining at least one characteristic of the deformation, and making a wellbore decision related to an integrity of the casing string based on the at least one characteristic of the deformation or the point-wise eccentricity. The system may comprise an electromagnetic logging tool which may comprise a transmitter and at least one receiver.
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公开(公告)号：US10571596B2
公开(公告)日：2020-02-25
申请号：US15671803
申请日：2017-08-08
发明人： Yijin Zeng , Weining Ni , Xin Li , Wei Zhang , Jintai Mi , Jianhua Liu , Jibo Li , Jinping Wu , Meiling Zhan , Wenli Wang , Sanguo Li , Yiting Zheng
摘要： A resistivity measurement while drilling (MWD) device, including: a transmitting module arranged on an outer surface of a drill collar, for generating an induced current between the drill collar and surrounding formation by inductive coupling; a receiving electrode group including at least two electrodes, for receiving a measured current that reaches the electrode from the induced current through corresponding formation, two electrodes in the receiving electrode group being multiplexing electrodes; a resistivity calculation module configured to be connected to all or a part of the electrodes in the receiving electrode group in a measurement mode of the resistivity MWD device, to calculate the measured current received by a corresponding electrode and obtain resistivity of formation corresponding to the corresponding electrode; and a data transmission module configured to be connected to the multiplexing electrodes in a transmission mode of the resistivity MWD device, for transmitting calculated resistivity to a ground device.
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公开(公告)号：US10557966B2
公开(公告)日：2020-02-11
申请号：US15740493
申请日：2015-07-22
摘要： A system, in some embodiments, comprises: a fiber optic cable; first and second sensors to control a length of said cable; and first and second receiver coils that control the first and second sensors, respectively, wherein the first and second sensors maintain said length when the first and second receiver coils receive only a direct signal from a transmitter, wherein the first and second sensors modify said length when the first and second receiver coils receive a scattered signal from a formation.
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公开(公告)号：US10539706B2
公开(公告)日：2020-01-21
申请号：US15700547
申请日：2017-09-11
发明人： Paul F. Rodney
摘要： A ranging signal and a reference signal are generated. The reference signal has a lower frequency than the ranging signal. The reference signal is transmitted through a geological formation to be received by a ranging tool in a ranging well while the ranging signal is launched down a target well. The reference signal is reconstructed in the ranging well and a signal that is a combination of the ranging signal launched from the target well and noise are received in the ranging well. The received signal may be in the form of magnetic or electric field values or changes in these fields. The reconstructed reference signal, in combination with the received signal, is used to produce a filtered ranging signal. A relative location of the target well can then be determined in relation to the ranging well based on the filtered ranging signal. The location information can be used to direct drilling operations.
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公开(公告)号：US10527753B2
公开(公告)日：2020-01-07
申请号：US15026533
申请日：2014-10-03
摘要： Systems, methods, and apparatuses to generate a formation model are described. In one aspect, a logging system includes a transmitter to produce an electromagnetic field in a borehole, a receiver in the borehole to detect a first field signal induced by the electromagnetic field at a first depth of investigation and a second field signal induced by the electromagnetic field at a second depth of investigation, and a modeling unit to perform a first one-dimensional inversion on the first field signal and a second one-dimensional inversion on the second field signal, build a two-dimensional model from the first one-dimensional inversion and the second one-dimensional inversion, and perform a two-dimensional inversion on the two-dimensional model to generate a two-dimensional formation model.
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公开(公告)号：US10520634B2
公开(公告)日：2019-12-31
申请号：US15027521
申请日：2014-10-07
发明人： Oliver Clay , Iain Maxted , Jonathan Gore , Alexander Grigorov , Paul Moss
IPC分类号： G01V3/28 , E21B47/09 , G01N27/90 , E21B43/116
摘要： The present invention concerns a downhole cable or control line detection tool. More particularly, but not exclusively, this invention concerns a method and apparatus for the downhole detection of a cable or control line associated with the external wall of a well casing. A downhole tool for the detection of downhole cable or control lines is provided. The downhole tool comprises an eddy current sensor, the eddy current sensor being arranged to be proximate to the internal wall of a well casing. The eddy current sensor is arranged for pulsed operation. The downhole tool further comprises a mechanism for rotating the eddy current sensor, with an axis of rotation parallel with the longitudinal axis of a well casing.
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公开(公告)号：US20190353819A1
公开(公告)日：2019-11-21
申请号：US16396324
申请日：2019-04-26
发明人： Gong Li Wang , John Rasmus , Dean Homan
IPC分类号： G01V3/28
摘要： The highly valuable properties of resistivity and dielectric constant of a geological formation may be determined using an induction measurement, even for a geological formation with bed boundary or dipping effects, using a one-dimensional (1D) formation model. Induction measurements may be obtained in a wellbore through the geological formation using one or more downhole tools. One or more processors may be used to perform an inversion to estimate resistivity and dielectric constant values of the geological formation. The inversion may be performed using the induction measurements and a one-dimensional model that includes a number of geological layers.
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