Patents by Inventor John E. Fontenot, Jr.

John E. Fontenot, Jr. 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 optimizing the tripping velocity of a drill string
    Patent number: 4566318
    Abstract: The present invention is directed to a method for optimizing the tripping velocity of a drill string. The method of the present invention comprises determining the hydraulic fluid pressure in the borehole in a plurality of intervals as the drill string is pulled out of or run into the borehole. These actual pressures are compared against a predetermined acceptable pressure range for each interval. The limits for this acceptable pressure range are set by the maximum acceptable surge pressures and the minimum acceptable swab pressures established for the interval. The velocity of the drill string in each such interval is then adjusted in order to maximize the tripping velocity while maintaining the hydraulic fluid pressure within the acceptable range for each interval.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: January 28, 1986
    Assignee: NL Industries, Inc.
    Inventors: M. Vikram Rao, John E. Fontenot, Jr.