Improving oil recovery in the CO2 flooding process by utilizing nonpolar chemical modifiers

doi:10.1016/j.cjche.2015.12.002

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (5): 646-650.DOI: 10.1016/j.cjche.2015.12.002

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Improving oil recovery in the CO₂ flooding process by utilizing nonpolar chemical modifiers

Yong Yang¹, Xiangliang Li¹, Ping Guo¹, Yayun Zhuo², Yong Sha²

1 Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China;
2 College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361000, China

Received:2015-05-05 Revised:2015-06-14 Online:2016-06-14 Published:2016-05-28
Contact: Yong Sha
Supported by:
Supported by the National Science & Technology Pillar Program (2012BAC24B03).

Improving oil recovery in the CO₂ flooding process by utilizing nonpolar chemical modifiers

Yong Yang¹, Xiangliang Li¹, Ping Guo¹, Yayun Zhuo², Yong Sha²

1 Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China;
2 College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361000, China

通讯作者: Yong Sha
基金资助:
Supported by the National Science & Technology Pillar Program (2012BAC24B03).

Abstract

Abstract: By means of experiments of CO₂ miscibility with crude oil, four nonpolar chemicals were evaluated in order to enhance the miscibility of CO₂ with crude oil. Through pre-slug injection and joint injection of toluene in CO₂, crude oil displacement experiments in the slim-tube were conducted to investigate effects of the tolueneenhanced CO₂ flooding under simulated subterranean reservoir conditions. Experimental results showed that toluene can enhance extraction of oil into CO₂ and dissolution of CO₂ into oil with the increment of 251% and 64% respectively. Addition of toluene can obviously improve the oil recovery in either pre-slug injection or joint injection, and the crude oil recovery increasedwith the increase of the toluene concentration. The oil recovery can increase by 22.5% in pre-slug injectionwith the high toluene concentration. Pre-slug injectionwas recommended because it can consume less toluene than joint injection. This work could be useful to development and application of the CO₂ flooding in the oil recovery as well as CO₂ emission reduction.

Key words: Carbon dioxide, Petroleum, Vapor liquid equilibria, Enhanced oil recovery, CO₂ flooding, CO₂ emission reduction

摘要： By means of experiments of CO₂ miscibility with crude oil, four nonpolar chemicals were evaluated in order to enhance the miscibility of CO₂ with crude oil. Through pre-slug injection and joint injection of toluene in CO₂, crude oil displacement experiments in the slim-tube were conducted to investigate effects of the tolueneenhanced CO₂ flooding under simulated subterranean reservoir conditions. Experimental results showed that toluene can enhance extraction of oil into CO₂ and dissolution of CO₂ into oil with the increment of 251% and 64% respectively. Addition of toluene can obviously improve the oil recovery in either pre-slug injection or joint injection, and the crude oil recovery increasedwith the increase of the toluene concentration. The oil recovery can increase by 22.5% in pre-slug injectionwith the high toluene concentration. Pre-slug injectionwas recommended because it can consume less toluene than joint injection. This work could be useful to development and application of the CO₂ flooding in the oil recovery as well as CO₂ emission reduction.

关键词: Carbon dioxide, Petroleum, Vapor liquid equilibria, Enhanced oil recovery, CO₂ flooding, CO₂ emission reduction

Yong Yang, Xiangliang Li, Ping Guo, Yayun Zhuo, Yong Sha. Improving oil recovery in the CO₂ flooding process by utilizing nonpolar chemical modifiers[J]. Chin.J.Chem.Eng., 2016, 24(5): 646-650.

Yong Yang, Xiangliang Li, Ping Guo, Yayun Zhuo, Yong Sha. Improving oil recovery in the CO₂ flooding process by utilizing nonpolar chemical modifiers[J]. Chinese Journal of Chemical Engineering, 2016, 24(5): 646-650.

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Improving oil recovery in the CO₂ flooding process by utilizing nonpolar chemical modifiers

Improving oil recovery in the CO₂ flooding process by utilizing nonpolar chemical modifiers

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