Patents by Inventor Randy D. Humphrey

Randy D. Humphrey 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).

  • Reverse circulation cementing process
    Patent number: 7013971
    Abstract: A method of cementing a casing in a wellbore with a tool having a plurality of holes therethrough connected at a lower end of the casing. The total cross-sectional area of the holes is preferably greater than the cross-sectional area of the inside of the casing. A plurality of stoppers are pumped in a leading edge of a cement slurry down an annulus between the casing and the wellbore to the tool where the stoppers engage the holes to hold the cement slurry in the annulus until the cement slurry hardens.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: March 21, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventors: James E. Griffith, Timothy W. Marriott, Edgar J. Liegis, Randy D. Humphrey, John L. Dennis, Jr.
  • Reverse circulation cementing process
    Publication number: 20040231846
    Abstract: A method of cementing a casing in a wellbore with a tool having a plurality of holes therethrough connected at a lower end of the casing. The total cross-sectional area of the holes is preferably greater than the cross-sectional area of the inside of the casing. A plurality of stoppers are pumped in a leading edge of a cement slurry down an annulus between the casing and the wellbore to the tool where the stoppers engage the holes to hold the cement slurry in the annulus until the cement slurry hardens.
    Type: Application
    Filed: May 21, 2003
    Publication date: November 25, 2004
    Inventors: James E. Griffith, Timothy W. Marriott, Edgar J. Liegis, Randy D. Humphrey, John L. Dennis