Optimization and Evaluation of Antioxidant Corrosion Inhibitor for Oxygen-reduced Air Drive Gathering&Transportation Pipelines
Existing antioxidant corrosion inhibitors are scarce in types,underperformed individually,and costly economically.Based on the actual working conditions of an oxygen-reduced air drive gathering&transporta-tion pipeline in China,by analyzing the oxygen corrosion mechanism,three antioxidant corrosion inhibitors EQI,HTT and TCT commonly used in oilfields were selected for dynamic corrosion evaluation experiments and surface morphology analysis.Then,molecular dynamics simulation was conducted on their adsorption on the Fe surface to obtain the adsorption energy of the inhibitor molecules on the Fe matrix surface in water solution environment.Fi-nally,combined with comparative analysis of simulation and experimental results,the inhibitor with the best per-formance was defined.Both experimental and simulation results show that the adsorption energies of molecules of the three inhibitors on the surface of Fe matrix in water solution are TCT>EQI>HTT in turn.The larger the adsorp-tion energy of the inhibitor molecule,the better the mitigation performance is.The conclusions provide theoretical guidance for the corrosion prevention of oxygen-reduced air drive gathering systems.
gathering&transportation pipelineoxygen-reduced air driveantioxidant corrosion inhibitormolecular dynamics simulationinhibition rateoxygen corrosion
万方数据
维普
