Analysis of physical property fitting and variation law of associated gas containing light hydrocarbon in CO2 flooding

Chun-wei Zhang; Xiao Sun; Tao Wang; Bao Wen; He Li; Zhao-feng Yang; Ting-ting Liu

doi:10.1117/12.2619868

9 December 2021 Analysis of physical property fitting and variation law of associated gas containing light hydrocarbon in CO₂ flooding

Chun-wei Zhang, Xiao Sun, Tao Wang, Bao Wen, He Li, Zhao-feng Yang, Ting-ting Liu

Author Affiliations +

Proceedings Volume 12030, Third International Conference on Optoelectronic Science and Materials (ICOSM 2021); 120301V (2021) https://doi.org/10.1117/12.2619868
Event: Third International Conference on Optoelectronic Science and Materials (ICOSM 2021), 2021, Hefei, China

Abstract

Capturing carbon dioxide produced by chemical plants and storing it in the oil reservoir can not only supplement the formation energy of the oil reservoir, but also improve the recovery rate. Based on the actual situation of the associated gas in the CO₂ injection area of an oilfield, this paper summarizes the influence of each main component on the two phase points of the associated gas through simulation calculations, and provides a theoretical basis for the setting of boundary conditions when the associated gas containing hydrocarbon impurities is reinjected. Studies have shown that as the content of light or heavy hydrocarbons increases, a two-phase zone will gradually appear. As the methane content increases, the temperature of the two-phase point gradually decreases, while propane, butane, pentane and hexane are the opposite. Compared with the pure carbon dioxide phase diagram, the two-phase point of the mixed gas containing methane enters the liquid phase region of carbon dioxide. The two phase points containing propane, butane, pentane and hexane move in the gas phase region of carbon dioxide. In particular, ethane has a small effect on the physical properties of associated gas, and when only ethane and carbon dioxide are contained, the two-phase point of the mixed gas has a low temperature and low pressure abnormal point. If the associated gas is directly reinjected, the pressure needs to be greater than 9.5 MPa to ensure that CO₂is pressurized to a supercritical state.

Citation Download Citation

Chun-wei Zhang, Xiao Sun, Tao Wang, Bao Wen, He Li, Zhao-feng Yang, and Ting-ting Liu "Analysis of physical property fitting and variation law of associated gas containing light hydrocarbon in CO₂ flooding", Proc. SPIE 12030, Third International Conference on Optoelectronic Science and Materials (ICOSM 2021), 120301V (9 December 2021); https://doi.org/10.1117/12.2619868

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KEYWORDS

Carbon monoxide

Carbon dioxide

Temperature metrology

Liquids

Methane

Carbon

Protactinium

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