Analysis on Inner Corrosion of Gathering Pipelines in Gas Condensate Field

Gas gathering pipeline systems in Yakela and Dalaoba Condensate Field were seriously corroded only after two-year's operation.In the light of this issue, corrosion environment over the Condensate Fields are investigated, and influence of sour gas, concentrated water, flow patterns and weld seam on gas gathering pipelines in the field is analyzed.Resultsdisplay that erosion corrosion is a primary corrosion type of single-well pipeline of Yakela Condensate Field, flow patterns and CO₂ content are main factor in affecting corrosion rate; groovingcorrosion and helcoid corrosion at pipe bottom are common features of gas gathering pipelines in the two field.In allusion to the corrosion features of the pipelines, anti-corrosion measures in strengthening corrosion detection, displacing or repairing corroded pipes and utilizing erosion resistance internal coating or inhibiter are presented.