Corrosion Evaluation and Mechanical Life Prediction of J55 Tubing Steel under Air-Foam Flooding Oil Well Conditions

Air-foam flooding technology is widely used for enhanced oil recovery. However, the resulting corrosive environment accelerates the mechanical failure of the tubing. Therefore, it is necessary to predict the service life of the tubing with corroded defects. Here, the finite element analysis combined with the experimental analysis is used to evaluate the compressive strength, collapse strength and tensile load of J55 tubing under simulated oilfield conditions. The results indicate that compared with the strength under the uniform corrosion with a corrosion depth of 1 mm, the mechanical strength of J55 tubing with the same depth caused by local corrosion is reduced by 17.8-27.1%. A widespread corrosion inhibitor, amide inhibitor HSJ-B2, with 95% inhibition efficiency was used to decrease the corrosion rate. Based on the established model *MAT PLASTIC KINEMATIC in LS-DYNA software, by using finite element method, it is predicted that the service life of J55 tubing under the air-foam flooding condition could be extended to ten years with the corrosion inhibitor.