Patents Assigned to Stirling Design International Limited
  • System for controlling the flow of fluid in an oil well
    Patent number: 5673751
    Abstract: A device is provided for controlling fluid flow in oil well casings or drill pipes. The device defines a flowpath for fluid through a casing section or drill pipe with the flowpath including a throttling valve which restricts or prevents the flow of fluid therethrough. This can be used to prevent U-tubing in casings or can be used to locate leaks in drill pipes or can be used to monitor the position of successive fluids of differing viscosities in a casing string.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: October 7, 1997
    Assignee: Stirling Design International Limited
    Inventors: Philip Head, Paul Gullett, Paul Wilmott
  • Device for controlling the flow of fluid in an oil well
    Patent number: 5404945
    Abstract: A device is provided for controlling fluid flow in oil well casings or drill pipes. The device defines a flowpath for fluid through a casing section or drill pipe with the flowpath including a throttling valve which restricts or prevents the flow of fluid therethrough. This can be used to prevent U-tubing in casings or can be used to locate leaks in drill pipes or can be used to monitor the position of successive fluids of differing viscosities in a casing string.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: April 11, 1995
    Assignee: Stirling Design International Limited
    Inventors: Philip Head, Paul Gullett, Paul Wilmott