Corrosion Behavior of TP140 in Simulated Oilfield Fresh Acid and Spent Acid Environments

SEM, EDS, XPS and confocal laser testing were used to study the corrosion behavior of casing pipe steel TP140 in the simulated oilfield fresh acid and residual (spent) acid environments. The results showed that the uniform corrosion rates of TP140 in both 120 ℃ fresh acid and 170 ℃ spent acid environments were within the range of the first grade of standard. The acidizing corrosion inhibitor was adsorbed on the specimens to form films which largely reduced the uniform corrosion rates of TP140 in fresh acid and spent acid environments. If adsorbed films were imperfect during the acidification, it would result in more serious localized corrosion.