Key Factors in development of a CO2/H2S corrosion prediction model for multiphase oil / gas production systems

Significant advances have been made in the study of CO₂/H₂S corrosion prediction and assessment in oil and gas production / transmission systems. A number of corrosion prediction models have been developed to predict corrosion rate in carbon steel. However, there is wide variability in these models. Many have successfully predicted the worst case corrosion rate but have not successfully addressed all the relevant and critical parametric effects.  The aim of this paper is to review the key issues in development of CO₂/H₂S corrosion prediction models in oil and gas systems. The paper will provide a critical evaluation of electrochemistry, water chemistry, flow modeling, temperature, scaling, water/gas/oil ratios, sulfur/aeration and inhibition issues in corrosion prediction and provide an overview of a corrosion prediction model that has been widely used by the industry over the last fifteen years.