Abstract
Compared with CO2 miscible flooding, near miscible flooding reduces the requirements of crude oil quality and reservoir pressure, CO2 source purity, and reduces the operation cost, which attracts more and more attention. High content CO2 (24%–90%) gas reservoir was found in an offshore x oilfield. It is difficult to realize miscible flooding by reinjection gas of high CO2 content, so it is necessary to evaluate the feasibility of near miscible flooding. This paper summarizes the main displacement mechanism of CO2 flooding, analyzes the main controlling factors of miscibility degree, and establishes an empirical formula suitable for impure CO2 near miscible displacement pressure, which can quickly evaluate the feasibility of pure/impure CO2 near miscible displacement for low permeability reservoirs. The results show that the purity of CO2 near miscible flooding is more than 64%, and the feasibility is very high by near miscible flooding. The research results provide technical basis for the feasibility and rapid evaluation of low permeability reservoir.
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References
Shyeh-Yung, J.J.: Effect of injectant composition and pressure on displacement of oil by enriched hydrocarbon gases. SPE Reserv. Eng. 10(2), 109–115 (1995)
Grigg, R.B., Gregory, M.D., Purkaple, J.D.: The effect of pressure on improved oilflood recovery from tertiary gas injection. SPE Reserv. Eng. 12(3), 179–188 (1997)
Schechter, D.S., Grigg, R., Guo, B., et al.: Wellman unit CO2 flood: Reservoir pressure reduction and flooding the water/oil. In: Proceedings of the SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers (1998)
Dong, M., Huang, S., Srivastava, R.: Effect of solution gas in oil on CO2 minimum miscibility pressure. J. Can. Pet. Technol. 39(11), 87–91 (2000)
Li, Y.: Technical advancement and prospect for CO2 flooding enhanced oil recovery in low permeability reservoirs. Pet. Geol. Recovery Effi. 29(1), 1–10 (2020)
Yuan, H., Johns, R.T., Egwuenu, A.M., et al.: Improved MMP correlations for CO2 floods using analytical gas flooding theory. SPE Reservoir Eval. Eng. 8(5), 6–18 (2004)
Rathmell, J.J., Stalkup, F.I., Hassinger, R.C.: A laboratory investigation of miscible displacement by carbon dioxide. Fall Meeting of the Society of Petroleum Engineers of AIME. Society of Petroleum Engineers (1971)
Alston, R.B., Kokolis, G.P., James, C.F.: CO2 minimum miscibility pressures: A correlation for impure CO2 streams and live oil systems. SPE J. (4), 268–274 (1985). SPE-11959-PA
Yellig, W.F., Metcalfe, R.S.: Determination and prediction of CO2 minimum miscibility pressures. J. Petrol. Technol. 32(01), 160–168 (1980)
Dong, M., Huang, S.S., Srivastava, R.: A laboratory study on near-miscible CO2 injection in steelman reservoir. J. Can. Pet. Technol. 40(2), 53–60 (2001)
Bon, J., Sarma, H.K.: Investigation of the effect of injection gas composition on CO2-rich flooding and its implications in an onshore Australia oilfield. Can. Int. Pet. Conf. Petroleum Society of Canada (2009)
Glaso, O.: Generalized minimum miscibility pressure correlation. SPE J. 25(6), 927–934 (1985)
Yellig, W.F., Metcalf, R.S.: Determination and prediction of CO2 minimum miscibility pressures. J. Pet. Tech. 32(1), 160–168 (1980)
Zhang, X., Chen, H., Li, B.: Discussion on controlling conditions of optimal near miscible flooding by impure CO2 in low permeability reservoir. China Offshore Oil and Gas 29(6), 75–77 (2017)
Acknowledgments
The research was financially supported by Open Foundation of State Key Laboratory of Offshore Oil Exploitation 2015-YXKJ-001).
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Zhang, Xs., Li, Bz. (2022). Influencing Factors of Impure CO2 Near Miscible Flooding and Its Feasibility Evaluation. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2021. IFEDC 2021. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-2149-0_99
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