Preparation And Inspection Of Casing Before Running

A. Inspection New casing is delivered free of injurious defects as defined in API Spec. 5D and within the practical limits of the inspection procedures therein prescribed. Some users have found that, for a limited number of critical well applica- tions, these procedures do not result in casing sufficiently free of defects to meet their needs for such critical applications. Various nondestructive inspection services have been employed by users to assure that the desired quality of casing is being run. In view of this practice, it is suggested that the individual user:
1. Familiarize himself with inspection practices specified in the standards and employed by the respective mills, and with the definition of "defect" contained in the standards.
2. Thoroughly evaluate any nondestructive inspection to be used by him on API tubular goods to assure himself that the inspection does in fact correctly locate and differentiate injurious defects from other variables which can be and frequently are sources of misleading "defect" signals with such inspection methods.

B. Thread Protectors All casing, whether new, used, or reconditioned, should always be handled with thread protectors in place. Casing should be handled at all times on racks or on wooden or metal surfaces free of rocks, sand, or dirt other than normal drilling mud. When lengths of casing are inadvertently dragged in the dirt, the threads should be recleaned and serviced again