Patents by Inventor Christopher Duncan Leith

Christopher Duncan Leith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for reducing sag in drilling, completion and workover fluids
    Patent number: 6989353
    Abstract: A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in significantly increased viscosity of the fluid.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: January 24, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Colin Temple, Andrew Forbes Paterson, Christopher Duncan Leith
  • Method for reducing sag in drilling, completion and workover fluids
    Patent number: 6861393
    Abstract: A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in increased viscosity of the fluid.
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: March 1, 2005
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Colin Temple, Andrew Forbes Paterson, Christopher Duncan Leith
  • Method for reducing sag in drilling, completion and workover fluids
    Publication number: 20040002426
    Abstract: A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in increased viscosity of the fluid.
    Type: Application
    Filed: June 19, 2002
    Publication date: January 1, 2004
    Inventors: Colin Temple, Andrew Forbes Paterson, Christopher Duncan Leith
  • Method for reducing sag in drilling, completion and workover fluids
    Publication number: 20030236172
    Abstract: A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in significantly increased viscosity of the fluid.
    Type: Application
    Filed: June 18, 2003
    Publication date: December 25, 2003
    Inventors: Colin Temple, Andrew Forbes Paterson, Christopher Duncan Leith