Corrosion Prediction and Protection of Sour Gas Gathering Pipeline

The gas, water and corrosion products in a sour gas field were analyzed. The results showed that the corrosion in the gas field gathering pipeline was mainly caused by CO2 corrosion. By the analysis of corrosion mechanism, on the basis of Shell 95 model, the influences of temperature and pH value on corrosion rate were studied. CO2 corrosion prediction model was built, and the reliability of the prediction model was verified by coupon weight loss experiments. In addition, corrosion inhibition of corrosion inhibitors ZD1-1 and HJF-B which are commonly used in field was evaluated under normal pressure and high pressure. The results can provide some basis of anti-corrosion for sour wet gas gathering pipelines.