Patents Represented by Attorney, Agent or Law Firm RatnerdPrestia
  • Apparatus and method for cleaning well risers
    Patent number: 6454009
    Abstract: The present invention is directed to a method of cleaning a well riser. In particular, the method comprises the steps of suspending in a drill pipe from the surface a circulating tool in the well riser, and causing the circulating tool to axially collapse so as to open one or more radial outlets in the tool and allow cleaning fluid to be expelled out of the tool and impact on the inside of the well riser.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: September 24, 2002
    Inventors: Mark Carmichael, Paul David Howlett