Abstract
The CO2-assisted fracturing fluid displacement technology is of great significance for enhancing oil recovery (EOR) of tight reservoirs, while the characteristics and mechanism of microscopic production for CO2-assisted fracturing fluid are still unclear. In this study, the displacement experiments of fracturing fluid and CO2-assisted fracturing fluid were launched with two various methods, the nuclear magnetic resonance technology (NMR) and high-temperature and -pressure visualization system respectively. The experimental results show that crude oil in mesopores and macropores is mainly displaced by fracturing fluids, and the residual oil is mainly retained in micropores and small pores. CO2-assisted fracturing fluid improved the oil recovery of tight reservoirs, with more crude oil recovered from small pores, mesopores and macropores, and less residual oil content in the form of flake and droplet. This study provides a prospective EOR technology for the efficient development of tight reservoirs.
Published Version
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