Patents by Inventor Pingjun Guo

Pingjun Guo 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).

  • Patent number: 7282704
    Abstract: Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where invasion is minimal. Using a Monte-Carlo method, a relationship is established between true formation porosity and porosity estimates from density and porosity tools. This relationship is used on real data to get an improved estimate of formation porosity and of gas saturation.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: October 16, 2007
    Assignee: Baker Hughes Incorporated
    Inventor: Pingjun Guo
  • Patent number: 7254486
    Abstract: A relative dip angle of a deviated borehole is determined from natural gamma ray measurements. Dip corrected measurements are processed to determine the thickness of thin beds, and the peak gamma ray response in thin beds.
    Type: Grant
    Filed: April 12, 2005
    Date of Patent: August 7, 2007
    Assignee: Baker Hughes Incorporated
    Inventor: Pingjun Guo
  • Publication number: 20070144740
    Abstract: A C/O ratio is determined using measurements of inelastically scattered gamma rays with a pulsed neutron source. Combined with look-up tables, the C/O measurement is used as an indicator of formation fluid influx into wellbore such as gas kick.
    Type: Application
    Filed: December 14, 2006
    Publication date: June 28, 2007
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Pingjun Guo, Padmakar Deo
  • Patent number: 7205535
    Abstract: Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From the elemental analysis, an estimate of the mineralogy of the formation is made treating the problem as one of Linear Programming (maximizing an objective function subject to equality and/or inequality constraints).
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: April 17, 2007
    Assignee: Baker Hughes Incorporated
    Inventors: William Madigan, Richard Pemper, Pingjun Guo
  • Publication number: 20070023624
    Abstract: A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pressure.
    Type: Application
    Filed: July 26, 2005
    Publication date: February 1, 2007
    Inventors: Darryl Trcka, Steve Riley, Pingjun Guo
  • Publication number: 20070023623
    Abstract: A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pressure.
    Type: Application
    Filed: July 26, 2005
    Publication date: February 1, 2007
    Inventors: Darryl Trcka, Steve Riley, Pingjun Guo
  • Publication number: 20070023625
    Abstract: A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pressure.
    Type: Application
    Filed: July 26, 2005
    Publication date: February 1, 2007
    Inventors: Darryl Trcka, Pingjun Guo, Steve Riley, Joseph Barolak, David Chace
  • Publication number: 20060229815
    Abstract: A relative dip angle of a deviated borehole is determined from natural gamma ray measurements. Dip corrected measurements are processed to determine the thickness of thin beds, and the peak gamma ray response in thin beds.
    Type: Application
    Filed: April 12, 2005
    Publication date: October 12, 2006
    Inventor: Pingjun Guo
  • Publication number: 20060208184
    Abstract: Resolution of thin beds made by a natural gamma ray logging tool is improved using a relation between the width of the response and the bed thickness. The peak gamma ray of the bed is determined using another relation between the measured gamma ray response and the bed thickness.
    Type: Application
    Filed: March 21, 2005
    Publication date: September 21, 2006
    Inventor: Pingjun Guo
  • Publication number: 20060033022
    Abstract: Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From the elemental analysis, an estimate of the mineralogy of the formation is made treating the problem as one of Linear Programming (maximizing an objective function subject to equality and/or inequality constraints).
    Type: Application
    Filed: August 12, 2004
    Publication date: February 16, 2006
    Inventors: William Madigan, Richard Pemper, Pingjun Guo
  • Publication number: 20060033023
    Abstract: Elemental analysis of an earth formation (including Aluminum) is obtained using measurements from a gamma ray logging tool. The inelastic spectrum of Aluminum is determined from measurements made in a water tank. From the elemental analysis, an estimate of the mineralogy of the formation is made treating the problem as one of Linear Programming (maximizing an objective function subject to equality and/or inequality constraints.
    Type: Application
    Filed: September 9, 2005
    Publication date: February 16, 2006
    Inventors: Richard Pemper, Pingjun Guo
  • Publication number: 20050263691
    Abstract: Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where invasion is minimal. Using a Monte-Carlo method, a relationship is established between true formation porosity and porosity estimates from density and porosity tools. This relationship is used on real data to get an improved estimate of formation porosity and of gas saturation.
    Type: Application
    Filed: May 28, 2004
    Publication date: December 1, 2005
    Inventor: Pingjun Guo
  • Publication number: 20040178337
    Abstract: A tool for measuring formation properties in situ. The tool includes a solid state neutron detector and a neutron source disposed on a drill string or wireline. The detector includes a boron carbon surface deposited on a substrate, and the surface can be multi-planar or curved for allowing sensitivity in more than one direction.
    Type: Application
    Filed: March 11, 2003
    Publication date: September 16, 2004
    Applicant: Baker Hughes Incorporated
    Inventors: Philip L. Kurkoski, Volker Krueger, Cornelis Huiszoon, Eric B. Molz, Pingjun Guo