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• W4220678093 abstract "Injecting CO 2 into deep reservoirs with high temperature and pressure (HTHP) is a promising method for enhancing oil recovery (EOR) and CO 2 utilization and storage (CUS). It is, however, challenging to quantitatively unravel the initiation mechanisms of micro-remaining oil and formation damage using microfluidic technology at 115 °C and 55 MPa. In this study, water/gas flooding experiments in the micromodel has carried out on the HPHT microfluidic experimental platform. The results reveal that 35.41% of the micro-remaining oil is recovered by scCO 2 extraction on the funnel-shaped interface, and 11.21% by carbonated water swelling. When water is injected into heterogeneous reservoirs, the oil-water displacement front in the high-permeability zone is less stable than that in the low-permeability zone. Subsequent scCO 2 injection resulted in asphaltene deposits (approximately 10.49% of pore volume), including low-velocity deposition, corner deposition and trap deposition, which reduced reservoir permeability. Moreover, compared with continuous CO 2 injection, the asphaltene deposition is reduced by 4.25% of CO 2 injection after waterflooding, including 2.64% in the high-permeability zone and 1.61% in the low-permeability zone. These observations provide important theoretical support for the application of CO 2 -EOR technology and carbon storage in deep reservoirs. • Microfluidic platform is built to simulate a deep reservoir at 55 MPa and 115 °C. • CO 2 enhances oil recovery by carbonated water swelling or funnel-shaped extraction. • Oil-water displacement front in high-permeability zone is more unstable. • Asphaltene deposition patterns include low-velocity, corner and trap deposition. • CO 2 injection after waterflooding can effectively reduce asphaltene deposition." @default.
• W4220678093 created "2022-04-03" @default.
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• W4220678093 date "2022-06-01" @default.
• W4220678093 modified "2023-10-10" @default.
• W4220678093 title "Microscopic remaining oil initiation mechanism and formation damage of CO2 injection after waterflooding in deep reservoirs" @default.
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• W4220678093 doi "https://doi.org/10.1016/j.energy.2022.123649" @default.
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