Patents by Inventor Roy W. Benefield

Roy W. Benefield 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).

  • Wellhead isolation tool
    Patent number: 6557629
    Abstract: A wellhead isolation tool for use with a wellhead assembly from which a tubing string is suspended comprises a tubular mandrel which includes an axial passage that extends therethrough and lower end that is adapted to engage the tubing string, a pumping head which is connected over the wellhead assembly and which includes an internal chamber that is in fluid communication with the axial passage and a port that extends through the pumping head to the chamber, and an actuator which is connected over the pumping head for moving the mandrel axially through the pumping head and into engagement with the tubing string. When the mandrel is engaged with the tubing string, fluid may be communicated through the port, the chamber and the mandrel and into the tubing string.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: May 6, 2003
    Assignee: FMC Technologies, Inc.
    Inventors: Henry Wong, Roy W. Benefield, George E. Guthrie, Christopher P. Egan
  • Wellhead lsolation tool
    Publication number: 20020117298
    Abstract: A wellhead insolation tool for use with a wellhead assembly from which a tubing string is suspended comprises a tubular mandrel which includes an axial passage that extends therethrough and lower end that is adapted to engage the tubing string, a pumping head which is connected over the wellhead assembly and which includes an internal chamber that is in fluid communication with the axial passage and a port that extends through the pumping head to the chamber, and an actuator which is connected over the pumping head for moving the mandrel axially through the pumping head and into engagement with the tubing string. When the mandrel is engaged with the tubing string, fluid may be communicated through the port, the chamber and the mandrel and into the tubing string.
    Type: Application
    Filed: September 28, 2001
    Publication date: August 29, 2002
    Inventors: Henry Wong, Roy W. Benefield, George E. Guthrie, Christopher P. Egan
  • Pressure energized/pressure intensified casing seal
    Patent number: 4848777
    Abstract: A casing seal for use with a source of high pressure fluids with apparatus for preventing shredding of the seal with variations in fluid pressure. A T-shaped annular metal ring provides a multiplication of fluid pressure so pressure exerted on an elastomeric sealing ring is greater than the fluid pressure. This multiplication prevents gases from entering the elastomer and prevents shredding of the elastomer when pressure is released. The multiplication of pressure also forces the elastomer firmly against a casing and a casing head to provide a fluid-tight seal.
    Type: Grant
    Filed: September 18, 1987
    Date of Patent: July 18, 1989
    Assignee: FMC Corporation
    Inventors: David A. Zollo, Roy W. Benefield, David E. Cain, Phillip F. Huang, Brenda K. Montemayor, Ray Myers, Stephen L. Neeld, John C. Vicic, Don B. Wafer