Patents Assigned to Specialised Petroleum Group Services Limited
  • Circulation tool
    Patent number: 7441607
    Abstract: A downhole tool for circulating fluid in a well bore. The tool includes an axial inlet and outlet with radial second outlets. A sleeve moves over the second outlets to control circulation of fluid. The sleeve can be selectively locked in an opened or closed configuration while the tool is in tension or compression. Variation of fluid pressure in the work string and stroking the tool move the sleeve between the operating positions. Cyclic operation of the tool is also described.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: October 28, 2008
    Assignee: Specialised Petroleum Group Services Limited
    Inventor: George Telfer