Patents by Inventor Duane Grubert

Duane Grubert 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).

  • Patent number: 5027899
    Abstract: A well, penetrating a subterranean fluid-producing formation, is effectively gravel packed by a method comprising two sequential steps. In the first step, a slurry of gravel and carrier fluid is introduced into the formation at a pressure substantially in excess of the formation fracture pressure. In the second step, a slurry of gravel and carrier fluid is introduced into the formation at a pressure below the formation fracture pressure. Wells so treated exhibit enchanced rates of production for longer periods of time than would be obtained with conventional gravel packing.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: July 2, 1991
    Assignee: Union Oil Company of California
    Inventor: Duane Grubert