Patents by Inventor Chaur-Jian Hsu
Chaur-Jian Hsu 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: 10101255Abstract: Methods and apparatus are provided for the measurement of the compressibility of reservoir fluid. A piezoelectric material is coupled to a wall of a fluid chamber. Compressibility is derived from measured pressure changes to the fluid resulting from volumetric changes to the fluid chamber imposed by the mechanical strain of the piezoelectric material resulting from an applied electric field.Type: GrantFiled: September 11, 2015Date of Patent: October 16, 2018Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Yusuf Bilgin Altundas, Chaur-Jian Hsu, Terizhandur S. Ramakrishnan, Quincy K. Elias, Albert Perez, Jr.
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Patent number: 8612154Abstract: A downhole logging tool is equipped with a modified Helmholtz resonator for facilitating acoustic formation evaluation and reservoir characterization. The resonator permits calculation of sound speed and viscosity of the fluid in the resonator cavity. The presence of gas bubbles in the fluid may also be detected. The modified Helmholtz resonator includes at least two openings so that fluid can flow through the resonator cavity. Because fluid can flow through the resonator cavity, local fluid can be measured under local conditions, e.g., downhole temperature, pressure, and gas influx from formations. Further, the modified Helmholtz resonator utilizes an acoustic signal at or near the frequency of interest for at least some acoustic logging tools.Type: GrantFiled: October 23, 2007Date of Patent: December 17, 2013Assignee: Schlumberger Technology CorporationInventor: Chaur-Jian Hsu
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Patent number: 8321133Abstract: A technique for utilizing tube waves to measure sound speed of fluids and other properties in the frequency range of about 5 to 100 kHz. A drill string is equipped with a sensor tube having a cavity filled with a downhole fluid such as borehole mud or formation fluid. An acoustic transmitter and an array of acoustic receivers are mounted on the tube in direct contact with the fluid. Processing circuitry calculates a property, e.g., sound speed, of the fluid based on time-of-flight of an acoustic signal generated by the transmitter and received by the array of receivers. Alternatively change in signal phase as a function of frequency may be employed by the processing circuitry. The technique is particularly suited to measuring the sound speed of borehole mud in situ.Type: GrantFiled: October 23, 2007Date of Patent: November 27, 2012Assignee: Schlumberger Technology CorporationInventors: Chaur-Jian Hsu, Ralph M. D'Angelo
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Patent number: 8102732Abstract: Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the principal shear directions of a formation while drilling or during wireline or other operations.Type: GrantFiled: October 15, 2009Date of Patent: January 24, 2012Assignee: Schlumberger Technology CorporationInventors: Jahir Pabon, Chaur-Jian Hsu, Bikash K. Sinha
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Patent number: 7984771Abstract: Apparatus and methods are described for highly attenuating vibrations of a drillstring assembly while drilling. In one embodiment, vibrations are attenuated by introducing one or more vibration attenuation modules at appropriate assembly locations. For example, vibration attenuation modules may be inserted at locations where vibration energy is expected to be maximal. In one embodiment the vibration attenuation modules include cavities loosely packed with particles of solid material such as sand or metallic powder. In one embodiment, the cavity walls are rough and/or include geometric features that enhance vibration energy transfer to the loosely packed particles in the cavity(ies). The vibration energy is dissipated via friction and inelastic particle-particle and particle-wall collisions that occur as a result of drillstring motion.Type: GrantFiled: September 21, 2010Date of Patent: July 26, 2011Assignee: Schlumberger Technology CorporationInventors: Jahir Pabon, Joachim Sihler, Demosthenis Pafitis, Chaur-Jian Hsu
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Publication number: 20110011644Abstract: Apparatus and methods are described for highly attenuating vibrations of a drillstring assembly while drilling. In one embodiment, vibrations are attenuated by introducing one or more vibration attenuation modules at appropriate assembly locations. For example, vibration attenuation modules may be inserted at locations where vibration energy is expected to be maximal. In one embodiment the vibration attenuation modules include cavities loosely packed with particles of solid material such as sand or metallic powder. In one embodiment, the cavity walls are rough and/or include geometric features that enhance vibration energy transfer to the loosely packed particles in the cavity(ies). The vibration energy is dissipated via friction and inelastic particle-particle and particle-wall collisions that occur as a result of drillstring motion.Type: ApplicationFiled: September 21, 2010Publication date: January 20, 2011Applicant: Schlumberger Technology CorporationInventors: Jahir Alfonso Pabon, Joachim Sihler, Demosthenis Georgeou Pafitis, Chaur-Jian Hsu
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Patent number: 7828082Abstract: Apparatus and methods are described for highly attenuating vibrations of a drillstring assembly while drilling. In one embodiment, vibrations are attenuated by introducing one or more vibration attenuation modules at appropriate assembly locations. For example, vibration attenuation modules may be inserted at locations where vibration energy is expected to be maximal. In one embodiment the vibration attenuation modules include cavities loosely packed with particles of solid material such as sand or metallic powder. In one embodiment, the cavity walls are rough and/or include geometric features that enhance vibration energy transfer to the loosely packed particles in the cavity(ies). The vibration energy is dissipated via friction and inelastic particle-particle and particle-wall collisions that occur as a result of drillstring motion.Type: GrantFiled: September 20, 2006Date of Patent: November 9, 2010Assignee: Schlumberger Technology CorporationInventors: Jahir Alfonso Pabon, Joachim Sihler, Demosthenis Georgeou Pafitis, Chaur-Jian Hsu
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Publication number: 20100034052Abstract: Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the principal shear directions of a formation while drilling or during wireline or other operations.Type: ApplicationFiled: October 15, 2009Publication date: February 11, 2010Applicant: Schlumberger Technology CorporationInventors: Jahir Pabon, Chaur-Jian Hsu, Bikash K. Sinha
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Patent number: 7623412Abstract: Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the principal shear directions of a formation while drilling or during wireline or other operations.Type: GrantFiled: March 7, 2006Date of Patent: November 24, 2009Assignee: Schlumberger Technology CorporationInventors: Jahir Pabon, Chaur-Jian Hsu, Bikash K. Sinha
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Publication number: 20090105957Abstract: A technique for utilizing tube waves to measure sound speed of fluids and other properties in the frequency range of about 5 to 100 kHz. A drill string is equipped with a sensor tube having a cavity filled with a downhole fluid such as borehole mud or formation fluid. An acoustic transmitter and an array of acoustic receivers are mounted on the tube in direct contact with the fluid. Processing circuitry calculates a property, e.g., sound speed, of the fluid based on time-of-flight of an acoustic signal generated by the transmitter and received by the array of receivers. Alternatively change in signal phase as a function of frequency may be employed by the processing circuitry. The technique is particularly suited to measuring the sound speed of borehole mud in situ.Type: ApplicationFiled: October 23, 2007Publication date: April 23, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Chaur-Jian Hsu, Ralph M. D'Angelo
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Publication number: 20090101432Abstract: A downhole logging tool is equipped with a modified Helmholtz resonator for facilitating acoustic formation evaluation and reservoir characterization. The resonator permits calculation of sound speed and viscosity of the fluid in the resonator cavity. The presence of gas bubbles in the fluid may also be detected. The modified Helmholtz resonator includes at least two openings so that fluid can flow through the resonator cavity. Because fluid can flow through the resonator cavity, local fluid can be measured under local conditions, e.g., downhole temperature, pressure, and gas influx from formations. Further, the modified Helmholtz resonator utilizes an acoustic signal at or near the frequency of interest for at least some acoustic logging tools.Type: ApplicationFiled: October 23, 2007Publication date: April 23, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventor: Chaur-Jian Hsu
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Publication number: 20080066965Abstract: Apparatus and methods are described for highly attenuating vibrations of a drillstring assembly while drilling. In one embodiment, vibrations are attenuated by introducing one or more vibration attenuation modules at appropriate assembly locations. For example, vibration attenuation modules may be inserted at locations where vibration energy is expected to be maximal. In one embodiment the vibration attenuation modules include cavities loosely packed with particles of solid material such as sand or metallic powder. In one embodiment, the cavity walls are rough and/or include geometric features that enhance vibration energy transfer to the loosely packed particles in the cavity(ies). The vibration energy is dissipated via friction and inelastic particle-particle and particle-wall collisions that occur as a result of drillstring motion.Type: ApplicationFiled: September 20, 2006Publication date: March 20, 2008Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION, Incorporated in the State of TexasInventors: Jahir Alfonso Pabon, Joachim Sihler, Demosthenis Georgeou Pafitis, Chaur-Jian Hsu
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Publication number: 20070268782Abstract: Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the principal shear directions of a formation while drilling or during wireline or other operations.Type: ApplicationFiled: March 7, 2006Publication date: November 22, 2007Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION, Incorporated in the State of TexasInventors: Jahir Pabon, Chaur-Jian Hsu, Bikash Sinha
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Patent number: 7257489Abstract: A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter. A method determines shear wave slowness of the formation. The method includes propagating quadrupole wave energy into the formation and detecting quadrupole dispersive waveform received at a second location. Formation shear wave slowness is calculated using dispersive slowness time coherence processing.Type: GrantFiled: September 9, 2002Date of Patent: August 14, 2007Assignee: Schlumberger Technology CorporationInventors: Chaur-Jian Hsu, Jahir A. Pabon, Bikash K. Sinha, Sergey Asvadurov
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Publication number: 20050000688Abstract: A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter. A method determines shear wave slowness of the formation. The method includes propagating quadrupole wave energy into the formation and detecting quadrupole dispersive waveform received at a second location. Formation shear wave slowness is calculated using dispersive slowness time coherence processing.Type: ApplicationFiled: September 9, 2002Publication date: January 6, 2005Inventors: Chaur-Jian Hsu, Jahir Pabon, Bikash Sinha, Sergey Asvadurov
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Patent number: 6643221Abstract: In one aspect, the invention involves an acoustic logging tool for performing acoustic investigations of subsurface geological formations. In one embodiment, the tool comprises a generally longitudinally extending tool body adapted for positioning in a borehole. At least one transmitter is mounted on the tool body to emit acoustic energy. At least one receiver is also mounted on the tool body at a location axially displaced from the at least one transmitter. The receiver is adapted to receive acoustic energy. An attenuator is also positioned along the body and includes at least one cavity having a plurality of particles disposed therein. The attenuator as disclosed herein may be applied to other logging tools for protecting tool components and enhancing measurement quality. Methods for attenuating acoustic energy transmitted through the body of an acoustic logging tool or other logging tools are also disclosed.Type: GrantFiled: November 6, 2001Date of Patent: November 4, 2003Assignee: Schlumberger Technology CorporationInventors: Chaur-Jian Hsu, Jahir A. Pabon, Richard D. Joyce, Ralph M. D'Angelo, Jeffrey B. Aron, Pierre Campanac, Lennox Reid, H. Charles Straub, Cengiz Esmersoy, Darryl Grigor
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Patent number: 6631327Abstract: A tool generates signals indicative of shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter. A method determines shear wave slowness of the formation. The method includes propagating quadrupole wave energy into the formation and detecting quadrupole dispersive waveforms received at a second location.Type: GrantFiled: September 21, 2001Date of Patent: October 7, 2003Assignee: Schlumberger Technology CorporationInventors: Chaur-Jian Hsu, Jahir A. Pabon, Bikash A. Sinha
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Publication number: 20030058739Abstract: A tool generates signals indicative of shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter.Type: ApplicationFiled: September 21, 2001Publication date: March 27, 2003Inventors: Chaur-Jian Hsu, Jahir A. Pabon, Bikash A. Sinha
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Patent number: 5331604Abstract: The present invention offers methods and apparatus for low-frequency sonic borehole logging with tube waves using discrete frequency measurements. A source transducer emits sonic energy at a location in a borehole of at least one discrete frequency which induces propagation of tube waves in the borehole; sonic energy of the tube waves is received at multiple receiver locations in the borehole, the multiple receiver locations being spaced apart from one another and from the source transducer location; and at each said receiver location, the complex pressure response (amplitude and phase, or real and imaginary parts) of a receiver to the received sonic energy of the tube waves is detected relative to a phase reference.Type: GrantFiled: November 24, 1992Date of Patent: July 19, 1994Assignee: Schlumberger Technology CorporationInventors: Shu-Kong Chang, Chaur-Jian Hsu