Corrosion inhibitors are widely used for prolonging the lifetime of oil production facilities. In practice, it is important to quickly screen the effectiveness of a certain kind of corrosion inhibitor before its use in a target environment. However, the evaluation is actually quite challenging, which generally needs to be conducted in a simulated complex fluid by the aid of a large-scale multiphase flow loop. In this paper, a method was proposed to acquire electrochemical response from an electrode surface alternately wetted by oil and water. An optimized ODD corrosion inhibitor was evaluated by using this method in a CO2 containing brine solution and crude oil. It was found that the inhibitor behaved much more effectively and reached an extremely high efficiency of 99.9% in the oil/water alternate conditions. The significant retardation of the measured current peak values could be attributed to the enhanced adsorption of crude oil molecules on the electrode surface in the presence of ODD inhibitor. Field experiment also indicated that this ODD inhibitor was effective in preventing pipeline corrosion in an oil-water fluid. The proposed method can rapidly evaluate corrosion inhibitors in oil/water alternating conditions.

Subject
Crude oil inhibition, Steel surfaces, Water, Corrosion currents, Corrosion rate, Wetting, Aqueous solutions, Corrosion inhibitors, Steel, Crude, Cathodic inhibitors, Electrodes, Oil
Keywords:
Corrosion inhibitor, Multiphase flow, Oil-water mixture, Electrochemical test, Corrosion evaluation
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2019
Association for Materials Protection and Performance (AMPP)
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