公开(公告)号：US20170204683A1

公开(公告)日：2017-07-20

申请号：US15398501

申请日：2017-01-04

Applicant: SHELL OIL COMPANY

Inventor： Can ALTUNLU ,  Wissam ASSAAD ,  Djurre Hans ZIJSLING

IPC: E21B17/06 ,  E21B43/10

CPC classification number: E21B17/06 ,  E21B43/105

Abstract: 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.