Study on Anti-Corrosion Evaluation of Corrosion Inhibitor in Oxygen-Reduced Air Flooding Gathering and Transportation pipeline
Oxygen-reduced air flooding can effectively improve the recovery efficiency of low-permeability reservoirs,but the presence of oxygen will inevitably cause oxygen corrosion and CO2 corrosion of downstream gathering and transportation pipelines,thus limiting the popularization and application of oxygen-reduced air flooding.An anti-corrosion study of corrosion inhibitors was carried out for a domestic application of oxygen-reduced air flooding oilfield gathering and transportation pipelines.Under the condition of simulating the working conditions of on-site gathering and transportation pipelines,using the dynamic weight loss method of hanging pieces,6 kinds of anti-CO2 corrosion inhibitors and 6 kinds of anti-oxidative corrosion inhibitors were selected to evaluate the corrosion inhibition effect of 20 steel.In the experiment,two anti-oxidant corrosion inhibitors KY-12 and KY-17 and one anti-CO2 corrosion inhibitor A were selected,whose release rates reached 83.67％,91.49％and 78.44％,respectively.By comparing the three primary corrosion inhibitors at different temperatures(25 ℃,40 ℃ and 55 ℃)and different concentrations(400 mg/L,500 mg/L,800 mg/L,1000 mg/L and 2000 mg/L),according to the experimental evaluation,the KY-17 corrosion inhibitor with the best stability at different temperatures is selected,and the corrosion inhibition effect is best at different concentrations,and the release rate is up to 92.7％.This conclusion has good reference for the selection and dosage of corrosion inhibitors for downstream gathering and transportation pipelines in oxygen-reduced air flooding oilfields.
oxygen-reduced air floodinggathering pipeline20 steelselection of corrosion inhibitor
万方数据
维普
