Many potential risks to gas field gathering pipelines stem from CO2 corrosion. This study investigates the impact of CO2 partial pressure, fluid velocity and total pressure on the corrosion rate of carbon steel pipelines. The corresponding corrosion morphology and corrosion product compositions are explored. A grey relational analysis is performed based on the three chosen factors and determined through an orthogonal experiment. The weight of corrosion factors follows the order of CO2 partial pressure > total pressure > liquid velocity. Introducing a multiple linear regression approach, a dedicated model for predicting corrosion rates of gathering pipelines is built based on modified DW 95 model, which prediction accuracy is remarkably improved.
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