Oil well pipe, also known as special oil pipe, is the foundation of the petroleum industry. Casing, tubing and drill string compo
nents (drill pipe, drill collar, kelly, etc.) are collectively referred to as oil well pipe (OCTG)
Oil well pipes are often subjected to the combined action of corrosive media and alternating loads (bending, vibration) under service conditions, and severe corrosion fatigue damage will occur.
