Patents Assigned to M/D Totco
  • Drill string motion detection for bit depth calculation
    Patent number: 5274552
    Abstract: A motion detector is incorporated on a drilling rig for detection of drill string motion. An output of the motion detector provides an enabling signal for conversion of block height data to bit depth drill string velocity or penetration rate without errors associated with block motion during static drill string conditions.
    Type: Grant
    Filed: April 20, 1992
    Date of Patent: December 28, 1993
    Assignee: M/D Totco
    Inventor: John M. Milburn