“…These ideas include carbon dioxide injection, , nitrogen injection, water injection, and water-based solutions injection . Burrows et al discussed in detail the mechanism of enhanced oil recovery by high pressure carbon dioxide, natural gas, ethane, nitrogen, and water-based solutions. , The results show that carbon dioxide and rich natural gas have the most potential to enhance oil recovery. , Based on the characteristics of nanoscale pore sizes, low porosity, and low pore connectivity in tight oil reservoirs, huff-n-puff injection is the most successful and widely applied implementation strategy. , Therefore, EOR technology that combines horizontal well volume fracturing and carbon dioxide huff-n-puff has received more attention. , Bai proposed an enhanced oil recovery technology by the combination of horizontal well volume fracturing and CO 2 huff-n-puff, which was successfully applied to six fractured horizontal wells and achieved good oil increase effect . Pu conducted hydraulic fracturing and carbon dioxide huff-n-puff experiments using a true triaxial stress core fracturing and displacement system .…”