Patents Examined by Dave Carroll
  • Downhole tool and method
    Patent number: 9260941
    Abstract: A cleaning tool (1) for use in cleaning ferrous material from a wellbore has a magnetic cleaning functionality by provision of magnets (5) in an Halbach array on a downhole tool component of a workstring. The Halbach array may be an Halbach cylinder positioned on a mandrel wherein the magnetic field is external to the cylinder with substantially zero magnetic field within the tool.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: February 16, 2016
    Assignee: M-I Drilling Fluids UK Limited
    Inventor: James Linklater