Patents by Inventor Michael John Shepherd

Michael John Shepherd 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).

  • Apparatus for eliminating net drill bit torque and controlling drill bit walk
    Patent number: 7610970
    Abstract: A drilling apparatus controls or eliminates reaction torque from drill bits thereby preventing loss of penetration due to undesired rotation of the drilling apparatus or controls drilling direction by intentionally manipulating reaction torque thereby inducing desired drill bit walk. The drilling apparatus has a concentrically divided drill bit in which an inner drill bit rotates simultaneously in the opposite direction from an outer drill bit. The inner drill bit can be moved axially forward from or back toward the outer drill bit. Forces produced by the inner and outer drill bits are controlled to eliminate or adjust reaction torque.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: November 3, 2009
    Assignee: Schlumberger Technology Corporation
    Inventors: Joachim Sihler, Michael John Shepherd
  • APPARATUS FOR ELIIMINATING NET DRILL BIT TORQUE AND CONTROLLING DRILL BIT WALK
    Publication number: 20080135292
    Abstract: A drilling apparatus controls or eliminates reaction torque from drill bits thereby preventing loss of penetration due to undesired rotation of the drilling apparatus or controls drilling direction by intentionally manipulating reaction torque thereby inducing desired drill bit walk. The drilling apparatus has a concentrically divided drill bit in which an inner drill bit rotates simultaneously in the opposite direction from an outer drill bit. The inner drill bit can be moved axially forward from or back toward the outer drill bit. Forces produced by the inner and outer drill bits are controlled to eliminate or adjust reaction torque.
    Type: Application
    Filed: December 7, 2006
    Publication date: June 12, 2008
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Joachim Sihler, Michael John Shepherd