Abstract
Coiled tubing (CT) is increasingly used in completion and workover applications, especially as a deployment method for acid and other corrosive materials. The occurrence of internal wall loss and external pitting has become more common, especially if proper tubing management is not followed. Not only is there internal wall loss associated from the use of corrosive materials, but also external pitting from severe downhole environments as well as surface environments. The recent industry down turn has reduced the utilization of coiled tubing strings. This sometime causes deterioration of the metal quality through external and/or internal corrosion, particularly when good maintenance procedures are not followed, and strings are not properly protected from the environment. This becomes costly, as strings are unable to be used to their full life potential or when a job failure occurs because of poor string management.
This paper presents case data demonstrating that the use of CT inspection and proper tubing management can avoid or reduce future job problems. The use of the described techniques and good pipe management will in turn reduce safety problems, and lost revenue due to pipe failures and shortened string life.