Causes of Corrosion and Perforation of J55 Tubing in a Production Well in an Oilfield

The causes of J55 tubing corrosion perforation in a production well in an oilfield were analyzed by means of macro-morphology observation, chemical composition analysis, water quality analysis, corrosion product analysis and simulated corrosion test. The results showed that there was CO₂ corrosion in the production well, and the perforation of the tubing originated from the pitting pit induced by the non-metallic inclusions on the outer wall of the tubing. The high concentration Cl^- environment in the well further promoted the growth of pitting corrosion, and finally caused the pitting perforation of the tubing.