Corrosion Mechanism and Protection Technology of Gathering Line in Dina-2 Gas Condensate Field

Some pipelines of the gas gathering and processing in DINA-2 gas condensate field leaked out and burst, some pipe wall thinned, valves and equipment corroded within 3 months after the plant went into operation. such issues seriously affected the safety of gas production, by opening the corrosion site, measuring the thickness, observing the corrosion morphology and making laboratory analysis, sampling of production conditions for laboratory simulation studies, the results showed that the main line extension to the gas caused mutations in the medium flow pattern, the presence of low-speed vortex region near the side branch and branch no corrosion inhibitor in the branch causewd protection film faults, when the medium flowed through the low-speed vortex area, corrosive components and water accumulated, the formation of acidic corrosive environment, coupled with the increase of localized corrosion rate at high temperature and pressure, and joint erosion-corrosion of Cl- and CO2 at high flow rates were the main reasons for gathering pipeline corrosion in Dina 2 blocks. Some corrosion countermeasures were suggested.