Research On Anti-corrosion Technology Of Injection And Production Wells Of CO₂ Flooding

In the process of oil and gas exploration and transport, CO2 often as natural gas or oil associated gas components present in the oil and gas systems, to all kinds of metal equipment and pipeline poses a serious threat, leading to deterioration of material properties and equipment, shortened life expectancy, causing huge economic losses.The research focuses on the process of CO2 flooding system for flooding pattern analysis and evaluation of corrosion, and corrosion mechanism of the CO2 corrosion types, prediction analysis of different factors on the corrosion law.Of the injection well system, efficient inhibitor, the absolute corrosion rate of less than 0.125mm/a, inhibition efficiency up to 91%-99%, matching a corrosion inhibitor and method of filling technology, the establishment of a residual concentration of testtechnology and methods.Integration of the downhole corrosion monitoring technology, mainly linked to film corrosion monitoring method, the resistance probe method and realized oil well tubing, the annular space set corrosion data collection, to the corrosion risk assessment and early warning purposes, to reduce corrosion damage,prevention of accidents.Combination of CO2 Corrosion of injection wells and bore materials evaluation, application of corrosion inhibitor effectiveness, developed by CO2 injection well bore is made of carbon steel, and with the use of the packer, casing annulus measures to increase corrosion inhibitor; developed a comprehensive anti-corrosion measures for CO2 production wells focus on carbon steel+corrosion inhibitor.CO2 corrosion by law, indoor corrosion test and field test evaluation study, and tools to achieve pipeline material selection and application of CO2 corrosion inhibitor match the best and most economical form the conditions of the CO2 injection system EOR Corrosion Protection Measuresto ensure that underground CO2 injection wells string life.