Patents Represented by Attorney, Agent or Law Firm William Schull
  • Pack-off bushing
    Patent number: 6330912
    Abstract: A pack-off bushing for placement inside an outer conduit while a fluid is passed through an inner conduit positioned within the outer conduit. The bushing includes a mandrel having a mandrel passage extending axially therethrough, a housing carried on the mandrel and capable of axial movement relative to the mandrel and a balancing system associated with the mandrel and the housing for applying a balancing force to the mandrel to oppose an axial mandrel force applied to the mandrel.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: December 18, 2001
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Ian Gillis, Craig Knull