Patents by Inventor John E. Walraven

John E. Walraven 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).

  • Preventing buckling in drill string
    Patent number: 4384483
    Abstract: In the drilling of a well, buckling of a drill string is prevented by determining the buoyed weight, sliding friction, and external forces applied to the segments of a drill string and comparing the resultant axial force on each segment with a buckling threshold to indicate when the resultant axial force exceeds the threshold. The azimuth and inclination of segments of the drill string are measured. The forces on the drill string are resolved into the axial and normal components applied to the next shallower segment. From these, the forces applied to each segment are determined.
    Type: Grant
    Filed: August 11, 1981
    Date of Patent: May 24, 1983
    Assignee: Mobil Oil Corporation
    Inventors: Thomas B. Dellinger, Wilton Gravley, John E. Walraven