Patents Represented by Attorney Raymondm F. Keller

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  • Method and apparatus for testing spotting fluids for releasing stuck drill pipe
    Patent number: 4829816
    Abstract: An apparatus and method for testing the performance of spotting fluids used for freeing drill pipe stuck to drilling mud filter cake in a borehole. A small cylinder simulating the drill pipe is pressed against a filter cake in a vessel. Spotting fluid is applied and the cylinder and cake are pulled apart. The maximum force required to free the cylinder is recorded.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: May 16, 1989
    Assignee: Standard Oil Production Company
    Inventor: Jason C. Hubbard