Patents Assigned to Newpark Drilling Fluids, Inc.
  • Apparatus and method for testing lubricity
    Patent number: 5969227
    Abstract: A method and apparatus for determining the lubricity of an oil well drilling fluid, whereby a sample in a cell holder may be subjected to a desired pressure, temperature, kinetic friction, and lubricating fluid to simulate drilling conditions in a well bore, and particularly to simulate the drilling conditions of a non-vertical well bore such as encountered in horizontal drilling which generates sliding non-rotational frictional forces.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: October 19, 1999
    Assignee: Newpark Drilling Fluids, Inc.
    Inventor: Norman P. Kenney
  • Drilling mud additive
    Patent number: 4664818
    Abstract: An additive for drilling in water-sensitive shales comprising a partially hydrolyzed acrylamide-acrylate copolymer, potassium chloride and a polyanionic cellulose.
    Type: Grant
    Filed: July 26, 1985
    Date of Patent: May 12, 1987
    Assignee: Newpark Drilling Fluid Inc.
    Inventors: William S. Halliday, Vincent M. Thielen