Overview of Nondestructive Inspection Methods for the Drilling Pipe Thread

The fatigue crack of drilling pipe thread root is one of the most common defects in the drilling service, and it is one important cause to induce the rupture of drilling pipes. Several nondestructive testing methods to inspect the drilling pipe domestic and overseas are introduced; their principle, inspecting techniques, advantages and disadvantages are explained and analyzed. Finally, the conclusion is given about all the inspection methods.