Patents Assigned to PetroQuip Energy Services, LP
  • Formation saver sub and method
    Patent number: 8151891
    Abstract: A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston (or an annulus fluid pressure chamber and a tubular pressure chamber), a sleeve, a spring, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: April 10, 2012
    Assignee: PetroQuip Energy Services, LP
    Inventors: William J. Darnell, Charles D. Wintill, Rodney W. Long
  • Multiple-positioning mechanical shifting system and method
    Patent number: 8141648
    Abstract: A multiple-positioning mechanical shifting system including for used in hydrocarbon wells. The system includes a shifting tool capable of selectively positioning a mechanical sliding sleeve valve in multiple operational positions that varying the flow rate and/or volume of tubing string fluid flowing to the well annulus. The system also includes a multiple position mechanical choke valve. A method of operating the mechanical choke valve using the shifting tool is described.
    Type: Grant
    Filed: May 8, 2009
    Date of Patent: March 27, 2012
    Assignee: Petroquip Energy Services, LP
    Inventors: William John Darnell, Charles David Wintill, Rodney Wayne Long, Todd Ulrich Chretien
  • Formation saver sub and method
    Patent number: 7921922
    Abstract: A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston (or an annulus fluid pressure chamber and a tubular pressure chamber), a sleeve, a spring, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: April 12, 2011
    Assignee: PetroQuip Energy Services, LP
    Inventors: William J. Darnell, Charles D. Wintill, Rodney W. Long