Patents by Inventor Derrel Gurley

Derrel Gurley 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).

  • Gravel packer and service tool
    Patent number: 5069280
    Abstract: A gravel packer and service tool combination for use in subterranean wells operates sequentially to lock and seal the packer in the well at a producing formation, release a mechanical connection between the packer and service tool, and open a passage through which gravel packing can be performed. Each operational step can be performed in primary and secondary fluid pressure-responsive modes of operation. The secondary mode of operation can be employed in the event the primary mode of operation fails.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: December 3, 1991
    Assignee: Dowell Schlumberger Incorporated
    Inventors: L. Michael McKee, Joseph D. Scranton, Robert L. Brookey, Derrel Gurley, Ernie Sodich