Abstract: A method and apparatus for disconnecting an end rod from a drill string coupled together by a threaded connection is provided. A rod handling apparatus includes a gripper unit having a floating sled with a sensor unit configured to monitor relative axial position of the sled relative to a frame of the gripper unit to determine a decoupling of the threaded connection and a separation of an end rod from the drill string.
Type:
Grant
Filed:
April 9, 2014
Date of Patent:
January 1, 2019
Assignee:
SANDVIK INTELLECTIAL PROPERTY AB
Inventors:
Johan Jelgert, Lars-Erik Larsson, Per Vilen, Kent Evermark