Patents by Inventor Guoyu (David) Hu
Guoyu (David) Hu 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: 9157315Abstract: Disclosed herein are electromagnetic resistivity logging systems and methods that employ an antenna configuration having at most two transmitter or receiver antenna orientations that rotate relative to the borehole. The measurements made by this reduced-complexity antenna configuration enable the determination of at least seven components of a coupling matrix, which may be determined using a linear system of equations that express the azimuthal dependence of the measurements. For increased reliability, measurement averaging may be performed in azimuthally spaced bins. The coupling matrix components can then be used as the basis for determining logs of various formation parameters, including vertical resistivity and anisotropy.Type: GrantFiled: August 17, 2012Date of Patent: October 13, 2015Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Michael S. Bittar, Guoyu (David) Hu
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Patent number: 8030937Abstract: Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image.Type: GrantFiled: December 11, 2006Date of Patent: October 4, 2011Assignee: Halliburton Energy Services, Inc.Inventors: Guoyu (David) Hu, Michael S. Bittar, William J. Schaecher
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Patent number: 7746078Abstract: Calculating resistivity of an earth formation. At least some of the illustrative embodiments are systems including: a first current source current return (CSCR) pair, said first CSCR pair comprises a first current source and a first current return, the first current return receives current from the first current source; a second CSCR pair, the second CSCR pair disposed along a longitudinal axis of said apparatus from the first CSCR pair, the second CSCR pair comprises a second current source and a second current return, and the second current return receives current from the second current source; and a monitor electrode disposed between the first CSCR pair and the second CSCR pair, a distance between the first current source and the monitor electrode is substantially equal to the distance between the second current source and the monitor electrode, and the monitor electrode monitors a first voltage and a second voltage.Type: GrantFiled: August 29, 2008Date of Patent: June 29, 2010Assignee: Halliburton Energy Services, Inc.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Publication number: 20080315884Abstract: A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source-a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source-current return pair. Where more than one current source-current return pair is included, the tool is capable of multiple depths of investigation into surrounding formation. This data can be used as a gauge to establish the reliability of the data and to determine the resistance of the invaded zone around the borehole, as well as standoff distance of the tool from the borehole wall.Type: ApplicationFiled: August 29, 2008Publication date: December 25, 2008Applicant: HALLIBURTON ENERGY SERVICES, INC.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Publication number: 20080252296Abstract: Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image.Type: ApplicationFiled: December 11, 2006Publication date: October 16, 2008Applicant: Halliburton Energy Services, Inc.Inventors: Guoyu (David) Hu, Michael S. Bittar, William J. Schaecher
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Patent number: 7427863Abstract: Method and system for calculating resistivity of an earth formation. At least some of the illustrative embodiments are methods comprising transmitting a current from a first current source, receiving at least part of the current at a first current return, said first current disposed remotely from the first current source, and measuring a first voltage at a monitor electrode, said monitor electrode disposed more remotely from below the first current source than said first current return.Type: GrantFiled: July 13, 2006Date of Patent: September 23, 2008Assignee: Halliburton Energy Services, Inc.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Publication number: 20060255811Abstract: A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source—current return pair. Where more than one current source—current return pair is included, the tool is capable of multiple depths of investigation into surrounding formation. This data can be used as a gauge to establish the reliability of the data and to determine the resistance of the invaded zone around the borehole, as well as standoff distance of the tool from the borehole wall.Type: ApplicationFiled: July 13, 2006Publication date: November 16, 2006Applicant: Halliburton Energy Services, Inc.Inventors: Michael Bittar, Guoyu (David) Hu, James Buchanan
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Patent number: 7098664Abstract: A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source-current return pair. Where more than one current source-current return pair is included, the tool is capable of multiple depths of investigation into surrounding formation. This data can be used as a gauge to establish the reliability of the data and to determine the resistance of the invaded zone around the borehole, as well as standoff distance of the tool from the borehole wall.Type: GrantFiled: December 22, 2003Date of Patent: August 29, 2006Assignee: Halliburton Energy Services, Inc.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Patent number: 7046010Abstract: A multi-mode resistivity tool measures at multiple depths into the near-borehole formation. By use of a four mode tool, measuring to four depths at the formation, a more accurate invasion zone resistivity measurement may be made than previously known. The tool itself is shown as including six concentric electrodes, although not every electrode is necessary for every mode.Type: GrantFiled: December 22, 2003Date of Patent: May 16, 2006Assignee: Halliburton Energy Services, Inc.Inventors: Guoyu (David) Hu, Michael S. Bittar
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Publication number: 20050134280Abstract: A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source—current return pair. Where more than one current source—current return pair is included, the tool is capable of multiple depths of investigation into surrounding formation. This data can be used as a gauge to establish the reliability of the data and to determine the resistance of the invaded zone around the borehole, as well as standoff distance of the tool from the borehole wall.Type: ApplicationFiled: December 22, 2003Publication date: June 23, 2005Applicant: Halliburton Energy Services, Inc.Inventors: Michael Bittar, Guoyu (David) Hu, James Buchanan
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Publication number: 20050134279Abstract: A multi-mode resistivity tool measures at multiple depths into the near-borehole formation. By use of a four mode tool, measuring to four depths at the formation, a more accurate invasion zone resistivity measurement may be made than previously known. The tool itself is shown as including six concentric electrodes, although not every electrode is necessary for every mode.Type: ApplicationFiled: December 22, 2003Publication date: June 23, 2005Applicant: Halliburton Energy Services, Inc.Inventors: Guoyu (David) Hu, Michael Bittar