期刊
CHEMICAL ENGINEERING SCIENCE
卷 197, 期 -, 页码 204-211出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2018.12.016
关键词
Carbon dioxide; Nitrogen; Molecular dynamics simulation; Slug injection; Nanoslit
资金
- National Natural Science Foundation of China [51874332, U1663206, U1762212, 51622405]
- Fundamental Research Funds for the Central Universities [15CX08003A, YCX2017067, 18CX06006A]
Slug injection of CO2/N-2 has proven to be a promising technology for the enhancement of oil recovery in low/ultra-low permeability reservoirs. In spite of this, the detailed displacement process and interaction mechanisms remain unclear. Adopting molecular dynamic simulations, the displacement behavior of CO2/N-2 flooding was investigated at the molecular and atomic level. It was found that CO2 and N-2 play varying roles: the solubility of CO2 is strong, and the propel effect of N-2 provides an obvious advantage. Furthermore, the synergistic effect of the CO2 slug and N-2 slug was found to be better than single phase injection and even better than mixture gas (flue gas) flooding. Particularly, it shows the best displacement efficiency when CO2 is used as a front slug. This study unveils the underlying mechanism of gas flooding in low permeability reservoirs, and the results may be proved helpfully in providing theoretical support for the optimization of the injection mode. (C) 2018 Elsevier Ltd. All rights reserved.
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