Study on main control factors of surface system corrosion in Yuanba high sulfur gas field

The natural gas in Yuanba gas field contains high H₂S and CO₂. With the increase of water output and the increase of mineralization, the corrosion environment of surface system becomes more and more complex. In order to find out the main control factors that can affect the ground system corrosion of Yuanba gas field, this article establishes a grey correlation analysis method which takes CO₂ partial pressure, H₂S partial pressure, liquid-gas ratio, pH value, salinity, Cl^- concentration, and corrosion inhibitor residual concentration as independent variables, and corrosion rate as dependent variable. The influence degree of various factors on corrosion is analyzed by data. The results show that the main control factors of the ground system corrosion in Yuanba gas field are CO₂ partial pressure, H₂S partial pressure and liquid-gas ratio. Therefore, it is possible to appropriately optimize the corrosion inhibitor addition program, adjust the batch operation cycle, and reasonably reduce the cost of corrosion inhibitor pigging operation. The research results provide a technical basis for the integrity management of the ground system in Yuanba gas field.