Improvements in and relating to centralisers

摘要

A tubular coupling device for fixing together first and second wellbore tubulars e.g. casing joints 16, 18 comprises a collar 28 arranged to secure one end of said first wellbore tubular to an adjacent end of said second wellbore tubular and a centraliser 26 mounted on said collar. The centraliser may be fixed to the coupling device or may be rotatable relative thereto and restrained by stop collars 30 for use in drilling with liner or drilling with casing. The connection may be a threaded 25, welded, shrinkage, hydraulic expansion or hydroform connection and may be used with liner, casing or drillstring tubulars. The outer surface of the collar may comprise a low friction polymer. Mounting the centraliser on the collar alleviates centraliser installation and handling problems