Corrosion Rules of P110 Casing for Carbon Dioxide Flooding of High Temperature and Salinity Reservoir

A multi-phase flow carbon dioxide corrosion simulation device for production systems was developed. By simulating the multi-phase flow state corrosion environments of injection wells, production wells and ground gathering pipelines, the corrosion assessment and corrosion inhibitor performance evaluation of materials under conditions of various fluid states and different CO₂ partial pressures and temperatures were realized visually. On this basis, the effects of various corrosion factors such as salinity, temperature, CO₂ partial pressure and flow rate on the corrosion of P110 casing in CO₂ flooding production wells were studied. A high CO₂ partial pressure localized corrosion prediction model was established, and a localized corrosion prediction map of the CO₂ flooding well pipe was drawn. The results show that the key anti-corrosion parts of the P110 casing in the CO₂ flooding well were:high CO₂ partial pressure production well, middle and lower parts of the wellbore, and pipe column near the hydrodynamic surface. The field application results show that the prediction board achieves a prediction coincidence rate of 80%, which can quickly and accurately predict the corrosion law and corrosion situation of the wellbore.