Patents by Inventor Ernest Len Grebe

Ernest Len Grebe 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).

  • Inhibitive water-based drilling fluid system and method for drilling sands and other water-sensitive formations
    Patent number: 7439210
    Abstract: An inhibitive water-based polymer mud system and method for using the system in drilling and in stabilizing wellbores is disclosed for use in water sensitive formations as an alternative to oil-based muds. The system comprises a non-ionic low molecular weight polyacrylamide in combination with a non-ionic high molecular weight polyacrylamide, preferably long chain alcohol and poly anionic cellulose.
    Type: Grant
    Filed: April 24, 2004
    Date of Patent: October 21, 2008
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Gary C. West, Ernest Len Grebe, David Carbajal