LOW BREAK OUT SAFETY JOINT AND METHOD FOR RELEASABLY CONNECTING A TUBING EXPANSION ASSEMBLY TO A DRILL STRING

摘要

A low break out screw threaded safety joint for releasably connecting a Bottom Hole Assembly (BHA) of a well tubular expansion assembly to a drill string comprises a pair of intermeshing TOothed Mate (TOMA)rings (24) with intermeshing sawtooth profiles (25,26) teethed profiles that have a low break out performance upon reverse rotation of the drill string relative to the BHA, which may be stuck within the wellbore.