Inhibition of Imidazolines on CO2 Induced Corrosion of Carbon Steel in Oil and Water Alternatively Wetting Conditions
Corrosion inhibitor is the most commonly used for corrosion control in oil production,but the relevant inhibition mechanism in complex CO2 containing multiphase flow environment is still unclear.The effect of two typical oil-soluble and water-soluble imidazoline inhibitors on CO2 induced corrosion of carbon steel in oil and water alternatively wetting conditions was investigated.It was found that the corro-sion inhibition effect of the water-soluble imidazoline was better than that of the oil-soluble imidazoline,and the difference was mainly attributed to the performance of interface oil/water.The oil-soluble imidazo-line molecules can improve the inhibition effect by enhancing the self-repair on the oil phase side,while the water-soluble imidazoline molecules can effectively inhibit the generation and growth of water drop-lets at the interface oil/water,weaken the rupture of CO2 to the oil layer,and enhance the corrosion inhibi-tion in dynamic wetting conditions.
CO2 corrosionimidazoline inhibitoroil-water alternate wetting
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