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Picture for Fast Evaluation of Corrosion Inhibitors Used in Oil/Water Mixed Fluids
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Fast Evaluation of Corrosion Inhibitors Used in Oil/Water Mixed Fluids

Product Number: 51319-12887-SG
Author: Ziming Wang
Publication Date: 2019
$20.00

Corrosion inhibitors are widely used for prolonging the lifetime of oil production facilities such as pipelines and separators. In practice it is important to quickly screen the effectiveness of a certain kind of corrosion inhibitor before its use in target environments. Since in an oil/water mixed fluid the presence of crude oil may completely change the protectiveness of an inhibitor it is important to evaluate the inhibition efficient directly in the oil/water fluid. 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. It can be employed to measure the potentiostatic polarization curve of an oil/water alternately wetted electrode. An optimized 2-oleyl-1-oleylamidoethyl imidazoline ammonium methyl sulfate (ODD) type corrosion inhibitor was evaluated by using this method in a CO2 containing brine solution. It was found that the inhibitor behaved much more effective and reached extremely high efficiency of 99% in the oil/water condition. The significant retardation of the measured current peak values could be due to the adsorption of crude oil molecules on the electrode surface in the presence of a trace amount of ODD inhibitor. Field experiment was conducted in a water treatment station of Shengli oilfield. It indicated that this ODD inhibitor was effective in preventing the pipeline from corrosion in an oil-contaminated CO2-containing water transportation system. Therefore the proposed test method is simple and cheap compared with the conventional flow loop experiments and can rapidly screen corrosion inhibitors in oil/water mixed fluids in the lab.