Influence of Ratio of Ca²⁺/HCO^-₃ on CO₂ Corrosion

The CO2 corrosion behaviors of 20# steel half-immersed in simulated oilfield produced waters were studied. The waters with two K values (K is ratio of Ca2+/HCO3-) were aerated with 0.1 MPa CO2 gas at 65 ℃. The results showed that the average corrosion rate of the samples with K=193 was lower than that with K=87, but the localized corrosion rate of the samples with K=193 was higher than that with K=87, indicating that the K value is one of the key parameters infuencing the CO2 corrosion.