Patents by Inventor Steven D. McPherson

Steven D. McPherson 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).

  • Enhanced oil recovery process including the simultaneous injection of a miscible gas and water
    Patent number: 5634520
    Abstract: An enhanced oil recovery process comprises of the at least periodic introduction of (i) a non-condensible gas preferably selected from among carbon dioxide, nitrogen, methane or mixtures thereof, and (ii) an aqueous drive solution, preferably brine, into a reservoir formation. In this process, the half cycle of non-condensible gas injection, prior to aqueous drive fluid injection, measured in hydrocarbon pore volume is less than 0.25%. In this preferred embodiment, the non-condensible gas, e.g., carbon dioxide, and water, are simultaneously injected into the formation.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: June 3, 1997
    Assignee: Chevron U.S.A. Inc.
    Inventors: Chris E. Stevens, Steven D. McPherson, John R. Larson, Donnell R. Robie, Ronald K. Wackowski
  • Enhanced oil recovery process including the simultaneous injection of a miscible gas and water
    Patent number: 5515919
    Abstract: An enhanced oil recovery process comprises of the at least periodic introduction of (i) a non-condensible gas preferably selected from among carbon dioxide, nitrogen, methane or mixtures thereof, and (ii) an aqueous drive solution, preferably brine, into a reservoir formation. In this process, the half cycle of non-condensible gas injection, prior to aqueous drive fluid injection, measured in hydrocarbon pore volume is less than 0.25%. In this preferred embodiment, the non-condensible gas, e.g., carbon dioxide, and water, are simultaneously injected into the formation.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: May 14, 1996
    Assignee: Chevron U.S.A Inc.
    Inventors: Chris E. Stevens, Steven D. McPherson, John R. Larson, Donnell R. Robie, Ronald K. Wackowski