Chemical flooding，gas injection，and heavy oil thermal recovery are the three important technologies of enhanced oil recovery（EOR）in China. In this paper，the application progress of gas injection，and heavy oil thermal recovery were expounded， including CCUS，N2 injection，hydrocarbon injection，and air injection in gas injection technologies，and steam flooding，steam stimulation，SAGD，thermochemistry assisted steam stimulation，in-situ combustion in heavy oil thermal recovery technologies.
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李广超.国内油田三次采油提高采收率主体技术进展（下）[J].油田化学,2023,40(1):175-181. LI Guangchao. Progress of Main Enhanced Oil Recovery Technologies for Oilfields in China（Ⅱ）[J]. OILFIELD CHEMISTRY,2023,40(1):175-181.
