AC-WSCI2 oil&gas well corrosion inhibitor is composed of imidazoline quaternary ammonium salt derivatives, double imidazoline and other components with corrosion inhibition properties. This product has good solubility in water and oil, which can effectively solve the problem of electro-chemical corrosion of the inner wall of the pipeline caused by multiple corrosive media such as CO2 ,H2S and inorganic salts. Moreover,it has good stability and low usage, which can greatly save the operation cost.