Patents by Inventor Dan Schofield

Dan Schofield 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).

  • Dual-stage valve straddle packer for selective stimulation of wells
    Patent number: 7789163
    Abstract: A straddle packer which, when in place during a fracing or well stimulation service, isolates the fracing zone from zones in the wellbore above and below the fracing zone, and which when run into the wellbore provides an open passageway from below the packer to the tubing string, relieving built up fluid pressure below the tool and permitting insertion at relatively high speeds.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: September 7, 2010
    Assignee: Extreme Energy Solutions, Inc.
    Inventors: Robert Kratochvil, Scott Kirk, Dan Schofield, Darko Smolcic
  • Dual-stage valve straddle packer for selective stimulation of wells
    Publication number: 20090159299
    Abstract: A straddle packer which, when in place during a fracing or well stimulation service, isolates the fracing zone from zones in the wellbore above and below the fracing zone, and which when run into the wellbore provides an open passageway from below the packer to the tubing string, relieving built up fluid pressure below the tool and permitting insertion at relatively high speeds.
    Type: Application
    Filed: December 21, 2007
    Publication date: June 25, 2009
    Inventors: Robert Kratochvil, Scott Kirk, Dan Schofield, Darko Smolcic