"双碳"背景下非常规油气藏CO2提高采收率技术研究现状及展望OA

Under the global carbon neutrality mandate,the integrated innovation of unconventional oil and gas reservoir development with carbon capture,utilization,and storage(CCUS)technology has emerged as a critical pathway to address the dual challenges of energy security and environmental sustainability.This paper aims to systematically review and evaluate the mechanisms,current applications,and technical bottlenecks of CO2-enhanced oil recovery(CO2-EOR)technologies in the development of unconventional oil and gas reservoirs.From the perspective of the full CCUS industrial chain,it proposed breakthrough directions for the future large-scale integration of these technologies and further explored their dual value in enhancing oil and gas recovery and achieving carbon neutrality goals.Unconventional oil and gas reservoirs,characterized by low permeability,complex pore structures,and discontinuous accumulation,present significant economic and technical challenges for conventional extraction methods.Research indicates that,by virtue of its unique supercritical physicochemical properties,CO2 can significantly improve reservoir development performance through a variety of EOR technologies,such as cyclic huff-and-puff,displacement,fracturing,heat exchange,and CO2-assisted imbibition.The interfacial interactions among CO2,crude oil,formation water,and reservoir rocks are the core controlling factors affecting displacement efficiency,which therefore necessitate precise regulation in conjunction with reservoir heterogeneity as well as temperature and pressure conditions.Current implementation of CO2-EOR remains constrained by several factors,including uneven distribution of CO2 sources,high transportation costs,strong reservoir heterogeneity,and underdeveloped CCUS industrial infrastructure.Looking forward from a full industrial chain perspective,advancements are urgently needed in high-efficiency and low-energy CO2 capture technologies,optimization of flooding and storage parameters,and the establishment of carbon market mechanisms complemented by supportive policy frameworks.These steps are essential to realize a closed-loop"capture,flooding,and storage"industrial chain.CO2-EOR technology offers a dual advantage by enabling the efficient development of unconventional oil and gas resources while simultaneously reducing carbon emissions.This integrated approach provides substantial value for the ongoing energy transition and supports the global commitment to achieving carbon neutrality.EOR technology offers a dual advantage by enabling the efficient development of unconventional