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公开(公告)号：US11105951B2
公开(公告)日：2021-08-31
申请号：US16811383
申请日：2020-03-06
发明人： Yike Hu , Gordon L Moake , Wei Zhang
摘要： A calibrator is positioned on a logging tool at an angular orientation with respect to the logging tool. The calibrator has a radioactive source of gamma radiation distributed inside the calibrator. A first detector count rate is determined based on a detector in the logging tool detecting gamma radiation. One or more of the calibrator and logging tool is rotated by a first number of degrees. A second detector count rate is determined based on the detector in the logging tool detecting gamma radiation. One or more of the calibrator and logging tool is rotated by second number of degrees. A third detector count rate is determined based on the detector in the logging tool detecting gamma radiation. The first, second, and third detector count rates are averaged to determine a calibration gain factor based on the average detector count rate and a known indication of gamma radiation emitted by the calibrator.
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公开(公告)号：US10281593B2
公开(公告)日：2019-05-07
申请号：US15127754
申请日：2015-06-01
发明人： Yike Hu , Weijun Guo
摘要： In some embodiments, an apparatus and a system, as well as a method, may operate to transform photons received at a scintillator into scintillation energy at a light yield efficiency of at least 30% at temperatures above 150 C. Further activities may include converting the scintillation energy to electron-hole pairs within a pixelated array of a position-sensitive detector having a bandgap of at least 2 eV. Additional apparatus, systems, and methods are described.
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公开(公告)号：US20190010800A1
公开(公告)日：2019-01-10
申请号：US16066502
申请日：2016-03-11
发明人： Yike Hu , Weijun Guo
摘要： Evaluation of borehole annulus cement quality is performed by an artificial neural network configured to estimate one or more cement attributes based on a radiation response of the annulus cement. A plurality of attributes indicative of quality of cement in the annulus can be estimated or derived based on gamma radiation response information (such as a gamma spectrum of the annulus cement). The artificial neural network is trained to perform the estimation by provision to the artificial neural network of training data from multiple example boreholes. The training data can include empirical data and/or simulation data.
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公开(公告)号：US20200326450A1
公开(公告)日：2020-10-15
申请号：US16811383
申请日：2020-03-06
发明人： Yike Hu , Gordon L Moake , Wei Zhang
摘要： A calibrator is positioned on a logging tool at an angular orientation with respect to the logging tool. The calibrator has a radioactive source of gamma radiation distributed inside the calibrator. A first detector count rate is determined based on a detector in the logging tool detecting gamma radiation. One or more of the calibrator and logging tool is rotated by a first number of degrees. A second detector count rate is determined based on the detector in the logging tool detecting gamma radiation. One or more of the calibrator and logging tool is rotated by second number of degrees. A third detector count rate is determined based on the detector in the logging tool detecting gamma radiation. The first, second, and third detector count rates are averaged to determine a calibration gain factor based on the average detector count rate and a known indication of gamma radiation emitted by the calibrator.
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公开(公告)号：US10393917B2
公开(公告)日：2019-08-27
申请号：US15533626
申请日：2015-03-26
发明人： Yike Hu , Weijun Guo
摘要： A tool can include an X-ray tomography device to evaluate cement in a downhole environment. The X-ray tomography device includes an X-ray beam source configured to transmit an X-ray beam at a first predetermined angle. The beam angle may be set by a capillary device coupled to the X-ray beam source. An energy dispersive, multi-pixel photon detector is configured to count detected backscatter photons received at a second predetermined angle and determine an energy spectrum for the detected photons. A density map of the cement may be generated in response to the number of detected photons. Additional apparatus, systems, and methods are disclosed.
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公开(公告)号：US10067261B2
公开(公告)日：2018-09-04
申请号：US15129131
申请日：2015-09-15
发明人： Yike Hu , Weijun Guo
摘要： A photon radiation detection systems utilizes scintillating fibers to detect downhole radioactivity along a wellbore. The system includes a light detection unit, extended light guide, and a scintillating fiber radiation detector extending along a wellbore. The scintillating fiber radiation detector may be a permanent part of the wellbore completion, or may be deployed via a downhole conveyance. The detected light photons may be utilized to evaluate the formation, cement layer or tubular string.
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公开(公告)号：US20180245451A1
公开(公告)日：2018-08-30
申请号：US15757613
申请日：2015-11-19
发明人： Yike Hu , Weijun Guo
摘要： A method for material evaluation may include detecting photons from gamma ray interactions with material in an annular region between a geological formation and a casing. An energy spectrum is generated from the detected photons. A difference between materials may then be detected based on a comparison of the generated energy spectrum with a reference spectrum for a known material (e.g., good cement, known fluid).
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公开(公告)号：US10941653B2
公开(公告)日：2021-03-09
申请号：US16314325
申请日：2018-05-15
发明人： Yike Hu , James E. Galford
IPC分类号： E21B49/00 , E21B47/00 , G01V5/12 , E21B47/002
摘要： A non-rotatable, downhole imaging tool, an imaging system including the non-rotatable imaging tool and methods of determining information about a wellbore employing the non-rotatable imaging tool are provided herein. One example of a non-rotatable imaging tool is disclosed that has a central axis and horizontal planes perpendicular to the central axis, and further includes: (1) a radiation detector positioned proximate the central axis and uniquely on one of the horizontal planes, and (2) a collimator configured to limit exposure of the radiation detector to a single azimuthal area along a circumference of the downhole imaging tool on the one of the horizontal planes.
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公开(公告)号：US10605954B2
公开(公告)日：2020-03-31
申请号：US15517947
申请日：2016-11-16
发明人： Yike Hu , Weijun Guo
IPC分类号： E21B47/005 , G01V5/12 , E21B47/00
摘要： A method may comprise providing a wellbore penetrating a subterranean formation, the wellbore being lined with a pipe and having a cement between the pipe and the wellbore, wherein the cement contains a defect; providing a control spectrum of gamma radiation count rates as a function of energy for a control, wherein the control comprises the cement without the defect; emitting gamma rays into the pipe and the cement having the defect from a source of a nuclear tool disposed in the wellbore; detecting count rates of gamma radiation scattered back from the pipe and the cement having the defect with a detector of the nuclear tool as a function of energy to produce a sample spectrum; and deriving one or more physical attributes related to the defect based on a comparison of the sample spectrum and the control spectrum.
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公开(公告)号：US10551523B2
公开(公告)日：2020-02-04
申请号：US15320908
申请日：2015-08-19
发明人： Yike Hu , Weijun Guo
摘要： Methods including taking a gamma spectrum from a wellbore at a target depth, wherein the wellbore penetrates a subterranean formation and has a completion profile comprising a pipe and an annulus between the pipe and the subterranean formation; determining a cement volumetric void space in the wellbore at the target depth; establishing a cement-void-spatial calibration curve based on obtained gamma spectra representing cement spatial void space locations in the annulus of the completion profile, wherein each cement volumetric void space amount in the wellbore has a characteristic cement-void-spatial calibration curve; comparing the wellbore gamma spectrum and the cement-void-spatial calibration curve; and determining a location of the cement volumetric void space in the wellbore at the target depth.
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