安全、健康和环境2026，Vol.26Issue(1)：40-49,10.DOI:10.3969/j.issn.1672-7932.2026.01.008
CO2驱井下缓蚀剂的优选与缓蚀机理研究
Optimization and Corrosion Inhibition Mechanism Research of Downhole Corrosion Inhibitors for CO2 Flooding
摘要
Abstract
In response to the severe downhole CO2 corrosion issue associated with high water content during the large-scale exploitation of CO2 flooding in Shengli Oilfield,a novel high-temperature resistant and anti-CO2 corrosion inhibitor was compounded and selected using monomeric corrosion inhibitors,including imidazoline,quaternary ammonium salt,thiourea,alkanolamine,and fatty alcohol.Through testing,the optimal corrosion inhibitor formulation consists primarily of 20%imidazoline+10%quaternary ammonium salt+4%thiourea+10%alcoholamine.Experiments demonstrated that at dosing concentrations above 200 mg/L,corrosion inhibition rates consistently achieved 85%and above,with applicability across varying temperatures,flow rates,and CO2 pressures.Research on the corrosion inhibition mechanism indicated that the adsorption process follows the Langmuir adsorption model,which increases the charge transfer resistance on the metal surface and suppresses the anodic corrosion process,thereby significantly reducing corrosion on the steel surface.Field tests demonstra-ted that at a dosage concentration of 200 mg/L,the downhole corrosion rate can be controlled below 0.076 mm/a,meeting the protection requirements.关键词
油气田/CO2驱/井下/高温高压/CO2缓蚀剂/缓蚀率/缓蚀机理Key words
oil and gas field/CO2 flooding/downhole/high temperature and pressure/CO2 corrosion in-hibitor/corrosion inhibition rate/corrosion inhibition mechanism分类
资源环境引用本文复制引用
李俊仪,魏旭,李山川,龙媛媛,董晓通,董浩文..CO2驱井下缓蚀剂的优选与缓蚀机理研究[J].安全、健康和环境,2026,26(1):40-49,10.基金项目
中国石化集团公司科技项目(P23043),CO2驱注采输系统腐蚀与安全风险防控关键技术. （P23043）
