Abstract: Four imidazoline derivatives are synthesized from oleic acid,multi-amine and modifiers.The corrosion inhibition action to A3 steel of imidazoline corrosion inhibitor is investigated by weight-loss measurement,the corrosion mediums are simulated brine with different salinity,simulated brine being saturated with carbon dioxide and re-injected produced water of oilfield.The results of experiment indicate that the imidazoline inhibitors can inhibit the corrosion of dissolved oxygen and that the inhibition effect to CO₂ corrosion is better than that to dissolved oxygen,the corrosion inhibition rate is 95.36% when the concentration of inhibitor D is 10mg/L.The corrosion inhibition rate changes between 10% to 15% when the mineralization of water changes from 10000mg/L to 70000mg/L.The result of re-injected produced water experiment shows that the imidazoline corrosion inhibitors are suitable for oil field and especially acidity water,the corrosion rate is less 0.076mm/a than the oil field criterion.

Key words: fcorrosion inhibitor, imidazoline, corrosion medium, corrosion inhibition performance, oilfield