According to the statistics, corrosion fatigue break accounted for a large proportion in the drill pipe break of the petroleum drilling accident.

CPS-XY07 chain crawler and phased array C scan technology are adopted to inspect φ110X8mm drill pipe internal corrosion situation.

φ1,φ2,φ3,φ4 and φ5 artificial holes with different depth display various color in the C-scan image. Therefore, uses can identify the drill pipe internal corrosion situation by judging color.