CO

2

flooding has the dual purpose of enhancing oil recovery（EOR） and carbon dioxide storage

and has a large development prospect. In particular

the need of carbon emission reduction gives a large space for the development of large-scale application of this technology. For Sinopec

the development history of CO

2

flooding can be divided into three stages: single well stimulation

pilot test and comprehensive application. After more than 50 years of development

CO

2

flo

oding mechanism and supporting technology have been relatively mature. According to the reservoir characteristics of Sinopec and three types of CO

2

flooding

which are miscible drive

near miscible drive and immiscible drive

the screening standard of CO

2

drive reservoir are established to clarify the mechanism of CO

2

flooding in low permeability reservoir

tight reservoir

medium and high permeability reservoir. Taking three reservoirs of Subei Basin

Fu-3 member of Caoshe Oilfield

Fu-3 member in Hua-26 fault block

and Duo-1 member of Zhoucheng Oilfield

and Gao-89-1 block of Zhengli Zhuanggao Block in Bohai Bay Basin as examples

the actual development effect of typical blocks are summarized

showing that CO

2

flooding is an important way to improve oil recovery efficiency. In order to solve the technical bottleneck of large-scale application of CO

2

flooding in low permeability reservoirs and medium-high permeability reservoirs

the researches on oil displacement mechanism and gas injection effect should be further strengthened to promote the development of CCUS. It is of great significance to achieve “carbon peak” and “carbon neutral” and ensure national energy security.