CCUS(Carbon capture,Utilization and Storage)technology is of great significance to the green and low-carbon transformation and the realization of the"dual carbon"goal,It includes important strategies like CO2 enhanced oil recovery(EOR)and sequestration.Jiangsu Oilfield has been focusing on CO2 EOR to improve recovery rates in the challenging fault block reservoirs of the Subei Basin.The company has developed four unique CO2 EOR models suitable for these complex reservoirs,featuring techniques like gravity-stable displacement.A notable achievement is the successful pilot of the methods such as"simulated horizontal well"GAGD technology in Hua-26 fault block,which led to the one hundred thousand CCUS project tailored for such reservoirs.According to statistics,Jiangsu Oilfield has injected a total of 30.34×104 t of liquid CO2,with a cumulative oil increase of 9.83×104 t,realizing a better production increase and economic benefits.These technical researches and tests can provide valuable insights for applying CO2 EOR in similar complex reservoirs.
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