Patents by Inventor Robert L. Harrigal

Robert L. Harrigal 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).

  • Recovering oil by injecting hot CO.sub.2 into a reservoir containing swelling clay
    Patent number: 4615392
    Abstract: In a heavy oil reservoir containing water-sensitive clay which impedes injections of either steam or cold CO.sub.2, oil is produced by injecting CO.sub.2 vapor at more than about 130.degree. F. at a pressure below the critical pressure for the CO.sub.2 or fracturing pressure for the reservoir.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: October 7, 1986
    Assignee: Shell California Production Inc.
    Inventor: Robert L. Harrigal