Abstract: 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.