A New Top-of-the-Line Corrosion Inhibitor to Mitigate Carbon Dioxide Corrosion in Wet Gas Systems

Abstract

Abstract Top-of-the-Line (TOL) corrosion in wet gas subsea production or gathering lines is often prevented by using corrosion-resistant alloys or batch corrosion inhibition programs. Both options are expensive or marginally effective. Using a Quartz Crystal Microbalance (QCM)-based laboratory methodology, a new effective TOL corrosion inhibitor has been developed. The product provides corrosion inhibition in wet gas systems, has a good environmental profile, and excellent compatibility with various materials. The paper describes laboratory QCM test results of various volatile amines, i.e., Volatile Corrosion Inhibitors (VCI), against TOL and its mitigation under simulated field conditions. In addition, standard laboratory corrosion test results together with the toxicity, biodegradation and compatibility of the product with metals, plastics and elastomers are reported. The new TLC corrosion inhibitor can be injected continuously as a replacement to the batch chemical treatment program and continuous volatile amine corrosion inhibitor products. The product enables gas producers to mitigate the impact of the TOL on pipeline integrity.