Model “TBQ” Casing Compensator works as a connector when an old damaged casing needs to be replaced and removed out from down_hole, while a new casing needs to be put down. Patch are particularly well suited to service in wells which contain fluids and gases which are harmful to synthetic rubber packers. It’s designed to from a permanent sealed connection between two strings of tubing or casing and cement them together in a single run. The seals used are compression type,multiple lead rings, These casing patches are very simple to operate.