Study on electrochemical corrosion of P110 tubing during air injection oil flooding

This article addresses the corrosion problem of P110 tubing during the process of enhancing oil recovery by injecting air. The effects of changes in oxygen content and tensile stress on the corrosion of P110 tubing were studied using electrochemical testing methods. The results show that with an increase in oxygen content (0, 10000 ppm, 20000 ppm, 30000 ppm, 40000 ppm), the product film on the surface of P110 tubing is loose and porous, the film resistance and charge transfer resistance decrease, the self-corrosion current density increases, and the corrosion intensifies. With an increase in tensile stress (0, 20%Ϭs, 50%Ϭs, 70%Ϭs, 100%Ϭs), the corrosion tendency of P110 tubing increases,the stability and protection of the product film are destroyed, the film resistance and charge transfer resistance decrease, the electrochemical activity of the steel surface increases, the self-corrosion current density increases, and the corrosion intensifies.Based on this, considering the effects of oxygen content and tensile stress on the corrosion of P110 tubing, anti-corrosion suggestions are given to provide a reference basis for corrosion control of air-injected tubular columns.