Patents by Inventor Joseph S. Tang

Joseph S. Tang 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).

  • Method for determining residual oil saturation of a watered-out reservoir
    Patent number: 5256572
    Abstract: A method for determining residual oil saturation of a watered-out reservoir using two water soluble tracers having different partition coefficients in oil. The partitioning tracers are selected from the group consisting of tritiated or carbon 14 tagged alcohols, ketones, aldehydes, water and oil insoluble inorganics and organic radioactive isotopes. The tracers are injected into the formation, and their production curves are analyzed over a period of time to determine chromatographic separation of the tracers.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: October 26, 1993
    Assignee: Exxon Production Research Company
    Inventors: Joseph S. Tang, Kelvin N. Wood, Harold G. Taylor
  • Use of tracers to monitor in situ miscibility of solvent in oil reservoirs during EOR
    Patent number: 5111882
    Abstract: A method for monitoring in situ miscibility of a solvent with reservoir oil by using at least two tracers having different boiling points and being miscible with the solvent. The tracers are mixed with the solvent, injected into a well and produced from another well. Appropriate analysis of the produced tracers will reveal whether the solvent is first contact miscible. The tracers are selected from the group consisting of halocarbons, halo-hydrocarbons, sulfur hexafluoride, tritiated or carbon 14 tagged hydrocarbons, tritium gas and radioactive isotopes of inert gases.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: May 12, 1992
    Assignee: Exxon Production Research Company
    Inventors: Joseph S. Tang, Bradford C. Harker