Research and Analysis on Corrosion of a Gas Gathering Station in a Gas Field in Northern Shaanxi

Abstract

This study focuses on the current corrosion situation of a gas gathering station in northern Shaanxi. Multiple experimental methods are used to conduct a systematic analysis and evaluation of corrosion coupons, aiming to clarify the corrosion behaviors and laws at different positions of the gas gathering station. By analyzing the main corrosion factors and combining the corrosion characteristics of the system, in-depth investigations of the corrosion details at each stage are carried out with the help of methods such as weight loss, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), line scanning, and pitting degree. The results show that the main elemental compositions of the corrosion products on the surfaces of the coupons in the incoming pipeline, sewage pipeline, and outgoing pipeline are Fe, C, S, O, and elements such as Na, Ba, and Si are also contained. It can be seen that the distribution of deposits on the coupon surfaces is uneven, and the corrosion product films in some areas have fallen off. The main corrosion products on the coupon surfaces are FeCO3 and a small amount of FeS, and the main cause of corrosion is mainly CO2.