Patents by Inventor Ralph E. Gilchrist

Ralph E. Gilchrist 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).

  • Water flooding process using multiple fluids
    Patent number: 4291765
    Abstract: A process for the recovery of oil from a subterranean formation containing oil, which is preferably a residium from a prior recovery operation which comprises injecting into said formation a first treatment fluid comprising an aqueous solution of polymer of 50 ppm to 5000 ppm polymer, for example a partially hydrolyzed polyacrylamide, in an amount of from 0.5 to 100% pore volume of the formation and thereafter injecting into said formation a second treatment fluid comprising a mixture of an aqueous solution of polymer and from 0.01 to 3.5 weight percent caustic, for example NaOH, in an amount of from 0.5 to 100% pore volume of the formation and recovering oil from the formation.
    Type: Grant
    Filed: August 2, 1979
    Date of Patent: September 29, 1981
    Assignee: Mitchell Energy Corporation
    Inventors: Ralph E. Gilchrist, George W. Hover, Robert M. Barber