Patents by Inventor Brian Llewellyn

Brian Llewellyn 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).

  • Controlling the pressure within an annular volume of a wellbore
    Publication number: 20070114033
    Abstract: A process is described for replacing at least a portion of the liquid within the annular volume of a casing system within a wellbore with a second liquid. The second liquid is preselected to provide a measure of control of the pressure within the annular volume as the fluid within the volume is being heated.
    Type: Application
    Filed: November 18, 2005
    Publication date: May 24, 2007
    Inventors: Robert Hermes, Manuel Gonzalez, Brian Llewellyn, James Bloys, Don Coates