COUPLING FOR INTERCONNECTING PIPE SECTIONS AND PIPE SECTION FOR WELL DRILLING OPERATIONS

摘要

COUPLING FOR INTERCONNECTING PIPE SECTIONS, AND PIPE SECTION FOR WELL DRILLING OPERATIONS Screw thread couplings for pipe sections in well drilling operations are provided with locking shoulders for locking the couplings against loosening due to impacts exerted thereon. The shoulders co-operate with means for guiding the locking shoulders to their locking position at the end of the coupling operation.