Patents by Inventor Zhijuan Zhang
Zhijuan Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11946166Abstract: The invention relates to a method for preparing an anti-counterfeiting modal fiber, including: mixing a pulp stock solution with a cellulose catalyst, alkalizing, aging, sulfonating, and then dissolving the pulp stock solution in an alkaline solution to obtain a treatment solution; mixing the treatment solution with multiple amino acid-metal chelates, filtering, defoaming and ripening to obtain a spinning stock solution; and mixing the spinning stock solution with a spinning bath additive, and wet spinning, followed by drafting, defoaming, desulfurizing, water washing, and other post-treatments, to obtain an anti-counterfeiting modal fiber, wherein the amino acid metal-chelates account for 0.5%-1.5% by weight of the spinning stock solution. Amino acid-metal chelates are used to anti-counterfeit and encrypt the modal fibers, and the anti-counterfeiting and encrypting is involved in the spinning stock solution of modal fibers.Type: GrantFiled: May 20, 2021Date of Patent: April 2, 2024Assignee: SOOCHOW UNIVERSITYInventors: Yuqing Liu, Qin Li, Xingxing Li, Yeke Zhang, Zhong Wang, Guohe Wang, Zhijuan Pan
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Patent number: 11905816Abstract: The thickness of borehole casing can be determined by ultrasound logging in conjunction with simulations of ultrasonic plane-wave echo waveforms across a range of frequencies for a plurality of casing thicknesses and correlation of synthetic frequency spectra derived from the simulated plane-wave echo waveforms for the various casing thicknesses against the frequency spectrum of a measured pulse-echo waveform. In accordance with various embodiments, a portion of the measured pulse-echo waveform that corresponds to the first reflection off the interface between the borehole casing and the borehole fluid is used as a driving pulse to weight the simulated plane-wave echo waveforms in the synthetic frequency spectrum.Type: GrantFiled: March 3, 2016Date of Patent: February 20, 2024Assignee: Halliburton Energy Services, Inc.Inventors: Zhijuan Zhang, Nazareth Bedrossian
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Patent number: 10884159Abstract: A method and system for evaluating the cement behind casing and fully inverting acoustic properties of the material, including density and the speed of sound. A density map of the cement sheath is determined using a nuclear logging technique. An acoustic impedance value of the cement sheath is provided, either by measurement using an ultrasonic logging technique or simulated using an acoustic model. The acoustic model may assume a vertical incident plane wave and flat plates for casing and the cement sheath. From the density map and the acoustic impedance value, a map of the speed of sound in the cement sheath, or a gap therein, may be determined.Type: GrantFiled: July 31, 2015Date of Patent: January 5, 2021Assignee: Halliburton Energy Services, Inc.Inventors: Zhijuan Zhang, Weijun Guo, Sriram Srinivasan
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Patent number: 10301932Abstract: Systems, methods, and software for determining impedance of a casing-cement bond are described. In some aspects, the bond impedance is determined based on results of comparing a measured waveform and a model waveform. The model waveform corresponds to an estimated impedance of the bond and corresponds to a ray tracing of an acoustic signal that accounts for a radiation pattern of the acoustic transmitter and a curvature of the well casing. The measured waveform and the model waveform are generated based on operating an acoustic transmitter and an acoustic receiver within a wellbore comprising the well casing.Type: GrantFiled: July 15, 2014Date of Patent: May 28, 2019Assignee: Halliburton Energy Services, Inc.Inventors: Tianrun Chen, Yibing Zheng, Tatiana Gilstrap, Arthur Chuen Hon Cheng, Robert Eric Epstein, Zhijuan Zhang
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Patent number: 10222501Abstract: Systems, devices, and methods for evaluating an earth formation intersected by a borehole using signals produced at a plurality of borehole depths by an ultrasonic transducer in the borehole, the signals produced by the transducer including ringdown signals from the ultrasonic transducer and echo signals from a wall of the borehole from a plurality of azimuthal orientations.Type: GrantFiled: January 18, 2017Date of Patent: March 5, 2019Assignee: Baker Hughes, a GE company, LLCInventors: Zhijuan Zhang, Douglas J. Patterson, Roger R. Steinsiek, Wei Han
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Patent number: 10209398Abstract: In some embodiments, an apparatus, system, and method may operate to determine the density of drilling fluid associated with photon activity in the drilling fluid using an array of nuclear detectors. Further activity may include determining acoustic impedance of the drilling fluid as a combination of the density and acoustic velocity. Additional apparatus and systems, as well as methods, are disclosed.Type: GrantFiled: December 3, 2015Date of Patent: February 19, 2019Assignee: Halliburton Energy Services, Inc.Inventors: Zhijuan Zhang, Weijun Guo, Sriram Srinivasan
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Publication number: 20180363446Abstract: The thickness of borehole casing can be determined by ultrasound logging in conjunction with simulations of ultrasonic plane-wave echo waveforms across a range of frequencies for a plurality of casing thicknesses and correlation of synthetic frequency spectra derived from the simulated plane-wave echo waveforms for the various casing thicknesses against the frequency spectrum of a measured pulse-echo waveform. In accordance with various embodiments, a portion of the measured pulse-echo waveform that corresponds to the first reflection off the interface between the borehole casing and the borehole fluid is used as a driving pulse to weight the simulated plane-wave echo waveforms in the synthetic frequency spectrum.Type: ApplicationFiled: March 3, 2016Publication date: December 20, 2018Inventors: Zhijuan Zhang, Nazareth Bedrossian
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Patent number: 10012762Abstract: 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.Type: GrantFiled: December 3, 2015Date of Patent: July 3, 2018Assignee: Halliburton Energy Services, Inc.Inventors: Zhijuan Zhang, Weijun Guo, Dongwon Lee
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Publication number: 20180180763Abstract: A method and system for evaluating the cement behind casing and fully inverting acoustic properties of the material, including density and the speed of sound. A density map of the cement sheath is determined using a nuclear logging technique. An acoustic impedance value of the cement sheath is provided, either by measurement using an ultrasonic logging technique or simulated using an acoustic model. The acoustic model may assume a vertical incident plane wave and flat plates for casing and the cement sheath. From the density map and the acoustic impedance value, a map of the speed of sound in the cement sheath, or a gap therein, may be determined.Type: ApplicationFiled: July 31, 2015Publication date: June 28, 2018Inventors: Zhijuan Zhang, Weijun Guo, Sriram Srinivasan
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Publication number: 20170284193Abstract: In some embodiments, a method acquires acoustic data with a receiver. The acoustic data is provided by a down hole tool, comprising the receiver, that can move within a borehole in a geological formation. Quality control workflow charts, representing selected acoustic data related to the down hole tool, the geological formation, and/or the borehole can be displayed, transformation controlled, and analyzed on a monitor. The quality control workflow charts comprise the selected acoustic data and/or transformed versions of signal waveforms of the selected acoustic data.Type: ApplicationFiled: November 11, 2014Publication date: October 5, 2017Inventors: Zhijuan Zhang, Rong Shu, Xiaobin Song, Arthur Cheng
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Publication number: 20170212263Abstract: Systems, devices, and methods for evaluating an earth formation intersected by a borehole using signals produced at a plurality of borehole depths by an ultrasonic transducer in the borehole, the signals produced by the transducer including ringdown signals from the ultrasonic transducer and echo signals from a wall of the borehole from a plurality of azimuthal orientations.Type: ApplicationFiled: January 18, 2017Publication date: July 27, 2017Applicant: BAKER HUGHES INCORPORATEDInventors: ZHIJUAN ZHANG, DOUGLAS J. PATTERSON, ROGER R. STEINSIEK, WEI HAN
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Publication number: 20170052280Abstract: In some embodiments, an apparatus, system, and method may operate to determine the density of drilling fluid associated with photon activity in the drilling fluid using an array of nuclear detectors. Further activity may include determining acoustic impedance of the drilling fluid as a combination of the density and acoustic velocity. Additional apparatus and systems, as well as methods, are disclosed.Type: ApplicationFiled: December 3, 2015Publication date: February 23, 2017Applicant: Halliburton Energy Services, Inc.Inventors: Zhijuan Zhang, Weijun Guo, Sriram Srinivasan
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Publication number: 20170045640Abstract: 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.Type: ApplicationFiled: December 3, 2015Publication date: February 16, 2017Inventors: Zhijuan Zhang, Weijun Guo, Dongwon Lee
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Publication number: 20160265348Abstract: Systems, methods, and software for determining impedance of a casing-cement bond are described. In some aspects, the bond impedance is determined based on results of comparing a measured waveform and a model waveform. The model waveform corresponds to an estimated impedance of the bond and corresponds to a ray tracing of an acoustic signal that accounts for a radiation pattern of the acoustic transmitter and a curvature of the well casing. The measured waveform and the model waveform are generated based on operating an acoustic transmitter and an acoustic receiver within a wellbore comprising the well casing.Type: ApplicationFiled: July 15, 2014Publication date: September 15, 2016Inventors: Tianrun Chen, Yibing Zheng, Tatiana Gilstrap, Arthur Chuen Hon Cheng, Robert Eric Epstein, Zhijuan Zhang
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Patent number: 9322807Abstract: In some embodiments, methods, apparatus, and systems may operate to launch acoustic waves along a first acoustic path length from an acoustic transducer. The apparatus receives a reflected signal in response to each acoustic wave, each reflected signal including at least one echo. The reflected signal is decomposed, using a time-frequency decomposition method with basis functions, into a wavelet associated with each echo. Parameters describing each associated wavelet are determined and a borehole evaluation or pipeline inspection is performed based on the parameters.Type: GrantFiled: April 16, 2014Date of Patent: April 26, 2016Assignee: Halliburton Energy Services, Inc.Inventors: Yinghui Lu, Arthur Cheng, Zhijuan Zhang, Tatiana Gilstrap, Rob Epstein
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Publication number: 20160010448Abstract: Systems, methods, and software for determining a thickness of a well casing are described. In some aspects, the thickness of the well casing is determined based on results of comparing a measured waveform and model waveforms. The measured waveform and model waveforms are generated based on operating an acoustic transmitter and an acoustic receiver within a wellbore comprising the well casing.Type: ApplicationFiled: July 15, 2014Publication date: January 14, 2016Applicant: Halliburton Energy Services, Inc.Inventors: Tianrun Chen, Yibing Zheng, Tatiana Gilstrap, Arthur Chuen Hon Cheng, Robert Eric Epstein, Zhijuan Zhang