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公开(公告)号：US20190004205A1
公开(公告)日：2019-01-03
申请号：US15534402
申请日：2015-03-26
发明人： Dongwon Lee , Weijun Guo
CPC分类号： G01V5/08 , E21B47/0005 , E21B49/08 , G01N23/203 , G01V5/12 , G01V5/125 , G21K1/02
摘要： A downhole tool can include a photon beam source configured to transmit a photon beam into materials lining a wellbore. The materials may comprise fluid, casing, and cement. A photon detector in the tool is configured to count detected photons received at a predetermined angle from the materials. The density of the borehole material may be determined in response to the number of detected photons. Changes in a distribution of a plurality of photon count ratio values may indicate the standoff distance. Additional apparatus, systems, and methods are disclosed.
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公开(公告)号：US20150369927A1
公开(公告)日：2015-12-24
申请号：US14649004
申请日：2013-12-11
发明人： Dongwon Lee , Weijun Guo
CPC分类号： G01T1/2002 , G01T1/2018 , G01V5/06
摘要： Various embodiments can include apparatus or methods to operate and provide detection packages. In various embodiments, detection packages may include an illuminating device, a photodetector, and an optical coupling component disposed between the illuminating device and the photodetector, where the optical coupling component can be structured to enhance the coupling of light from the illuminating device to the photodetector. Additional apparatus, systems, and methods are disclosed.
摘要翻译： 各种实施例可以包括用于操作和提供检测包的装置或方法。 在各种实施例中，检测包可以包括照明装置，光电检测器和设置在照明装置和光电检测器之间的光耦合部件，其中光耦合部件可被构造成增强从照明装置到光电检测器的光耦合 。 公开了附加装置，系统和方法。
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公开(公告)号：US10288749B2
公开(公告)日：2019-05-14
申请号：US15518240
申请日：2015-06-01
发明人： Yike Hu , Dongwon Lee , Weijun Guo
摘要： In some embodiments, an apparatus and a system, as well as a method and an article, may operate to receive photons at inner surfaces of an array of tubes forming a columnar structure, the tubes including a material with substantially high density, wherein longitudinal axes of the tubes are substantially parallel. Further activities include directing the photons within the columnar structure to a position-sensitive detector to measure the photons, wherein the position-sensitive detector is divided into an array of pixels, and wherein individual ones of the tubes in the array of tubes maintain a fixed mechanical arrangement with individual ones of the array of pixels, to provide collimation of the photons from a first end of the tubes to a second end of the tubes coupled to the position-sensitive detector. Additional apparatus, systems, and methods are described.
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公开(公告)号：US10012762B2
公开(公告)日：2018-07-03
申请号：US15113285
申请日：2015-12-03
发明人： Zhijuan Zhang , Weijun Guo , Dongwon Lee
IPC分类号： G01D18/00 , G01V11/00 , E21B47/09 , E21B47/14 , G01V1/48 , G01V5/04 , G01V1/40 , G01V5/12 , E21B49/08 , E21B47/00
CPC分类号： G01V11/002 , E21B47/0005 , E21B47/09 , E21B47/14 , E21B49/08 , G01V1/40 , G01V1/48 , G01V5/04 , G01V5/12 , G01V11/00
摘要： In some embodiments, methods, apparatus, and systems may operate to determine downhole tool standoff using a nuclear tool and photon activity, and to correct acoustic measurements using the standoff. Additional apparatus and systems, as well as methods, are disclosed,
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公开(公告)号：US09690006B2
公开(公告)日：2017-06-27
申请号：US14758700
申请日：2014-01-21
发明人： Dongwon Lee , Weijun Guo
摘要： Embodiments of the invention provide a downhole tool that includes a photon source, a photon detector having a plurality of detector pixels in a cylindrical row and column arrangement, and a radial collimator having at least two concentric frustoconical collimators circumferentially arranged about the photon detector and at least two azimuthal collimating members radially arranged with respect to the photon detector, wherein one of the azimuthal collimating members is on a first side of a detector pixel and a second azimuthal collimator is on a second side of a detector pixel opposite the first side.
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公开(公告)号：US10240451B2
公开(公告)日：2019-03-26
申请号：US15502534
申请日：2014-10-02
发明人： Dongwon Lee , Weijun Guo , Sriram Srinivasan
摘要： A tomographic imaging apparatus utilizes Compton backscattering to evaluate cement behind the casing. The imaging apparatus includes a slant-hole or pin-hole collimator coupled to a series of detectors in order to count the number of photons that backscatter off from the cement. The number of backscattered photons is proportional to the density of the cement behind the casing. Using the photon count, an image processing unit of the imaging apparatus generates a 2D or 3D tomographic image of the borehole.
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公开(公告)号：US20180292204A1
公开(公告)日：2018-10-11
申请号：US15755967
申请日：2015-10-08
发明人： Dongwon Lee , Weijun Guo
CPC分类号： G01B15/02 , E21B17/1078 , E21B47/00 , E21B47/082 , G01V5/125
摘要： A method for monitoring tubing wall thickness includes conveying a tool through a tubular string in a borehole, the tool including a photon source that directs a photon beam along a radial path toward a wall of the borehole, the tool further including an array of collimated detectors that measure Compton backscattering rates at respective distance bins along the radial path. The method further includes calculating a sequence of ratios between measurements from neighboring detectors. The method further includes identifying one or more local extrema in the sequence, each extremum representing a boundary between different materials. The method further includes determining a wall thickness of the tubular string from absolute or relative positions of the one or more extrema. The method further includes displaying a representation of the wall thickness.
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公开(公告)号：US09759834B2
公开(公告)日：2017-09-12
申请号：US14758695
申请日：2013-12-30
发明人： Dongwon Lee , Weijun Guo
IPC分类号： G01V5/08 , G01V5/12 , E21B47/00 , G01T1/20 , G01N23/203
CPC分类号： G01V5/08 , E21B47/0005 , G01N23/203 , G01T1/2018 , G01V5/125
摘要： Method and apparatus for downhole photon imaging. The downhole photon imaging apparatus includes a photon source that emits photons; a scintillation device that generates a light signal in response to received photons; a light sensing device coupled with the scintillation device for generating an electronic signal in response to a received light signal; and a collimator coupled with the scintillation device which has a design that allows photons with single Compton backscattering and backscattered at a pre-determined backscattering angle to be detected by the scintillation device.
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公开(公告)号：US20170218749A1
公开(公告)日：2017-08-03
申请号：US15502534
申请日：2014-10-02
发明人： Dongwon Lee , Weijun Guo , Sriram Srinivasan
CPC分类号： E21B47/0005 , E21B33/14 , E21B47/0002 , E21B47/0006 , G01V5/101 , G21K1/02
摘要： A tomographic imaging apparatus utilizes Compton backscattering to evaluate cement behind the casing. The imaging apparatus includes a slant-hole or pin-hole collimator coupled to a series of detectors in order to count the number of photons that backscatter off from the cement. The number of backscattered photons is proportional to the density of the cement behind the casing. Using the photon count, an image processing unit of the imaging apparatus generates a 2D or 3D tomographic image of the borehole.
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公开(公告)号：US10895661B2
公开(公告)日：2021-01-19
申请号：US15747578
申请日：2016-08-24
发明人： Qingzhen Guo , Dongwon Lee , Weijun Guo , Daniel F. Dorffer
IPC分类号： G01V5/04 , G01V5/06 , E21B47/085 , E21B49/08 , G01N9/24
摘要： Various apparatus or methods are arranged to operate a tool downhole in a well, where the tool has a detection package operable to detect gamma rays. Deviation of energy spectra of detected gamma rays in each selected energy window of a set of selected energy windows with respect to reference energy spectra of the respective selected energy window can be detected. One or more properties of one or more regions around the tool can be determined from the deviations, the regions being between the tool and a source of the detected gamma rays in a formation around the well. Additional apparatus, systems, and methods having a gamma ray detection package can operate in a variety of applications.
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