Patents by Inventor Wen-Ching Hsieh

Wen-Ching Hsieh 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).

  • Process for enhanced oil recovery employing synthetic sulfonates and petroleum sulfonate blends
    Patent number: 4530400
    Abstract: Enhanced oil recovery from a subterranean petroleum reservoir is realized by successively flooding oil-bearing subterranean formations with (1) a micellar displacement fluid comprising (A) a hydrocarbon, (B) optionally a cosurfactant, (C) brine, and (D) a synthetic sulfonate or a synthetic sulfonate in combination with one or more different petroleum sulfonates, (2) a mobility buffer, and (3) an aqueous drive fluid; the oil is recovered from one or more production wells spaced apart from the injection well in the reservoir.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: July 23, 1985
    Assignee: Union Oil Company of California
    Inventors: Wen-Ching Hsieh, Jeffery W. Koepke
  • Process for enhanced oil recovery employing petroleum sulfonate blends
    Patent number: 4446036
    Abstract: Enhanced oil recovery from a subterranean petroleum reservoir is realized by successively flooding oil-bearing subterranean formations with (1) a micellar displacement fluid comprising a hydrocarbon, cosurfactant, brine and two or more different petroleum sulfonates, (2) a mobility buffer, and (3) an aqueous drive fluid; the oil is recovered from one or more production wells spaced apart from the injection well in the reservoir.
    Type: Grant
    Filed: June 9, 1982
    Date of Patent: May 1, 1984
    Assignee: Union Oil Company of California
    Inventors: Wen-Ching Hsieh, June M. Bostich, Jeffery W. Koepke