Corrosion Failure Analysis of L80 Tubing

Tubing was perforated in some well of Xijiang oilfield.According to site conditions,the reason of corrosion failure was analyzed by SEM,EDS,XRD.The result showed that the perform-ances of oil pipe meet the API Spec 5CT standard requirement.Internal wall are damaged by CO2 corrosion,dissolved oxygen corrosion and Cl-,corrosive gas and medium come into the space be-tween casing string and tubing string corrode outer wall of tubing.