Hadi Ghasemi - Mechanical engineering, Head of Technical Inspection - Oil Exploration Operations Company,
Reza Azari - Electrical engineering, Ferdowsi University of Mashhad,

In Oil Exploration Operation s Company some New Grippers for injector of coiled tubing were built, but in during the operation on well Tube slipping and gliding were seen. Some tests were defined and after checking it was found the reason Lack of surface hardness . After heat treatment problem was solved.

Coiled tubing, Injector head, Gripper, Hardness