This review summarises recent advances in corrosion inhibitor research for CO2 enhanced oil recovery,focusing on the heteroatom modification,hydrophobic group optimisation,and synergistic effects of traditional inhibitors such as imidazolines and quaternary ammonium salts.It also explores green innovations and functionalised designs for emerging inhibitors including carbon quantum dots,smart responsive materials,and nanocomposites.The future direction of designing high temperature resistant compound system through‘structure-performance-mechanism’multi-scale correlation,promoting the integration of green synthesis and intelligent protection of nanomaterials,and deepening theoretical calculation to guide molecular directional optimization is prospected,which provides theoretical support and technical path for CO2 flooding corrosion protection.
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