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Influence of Temperature on the Adsorption and Diffusion of Heavy Oil in Quartz Nanopore: A Molecular Dynamics Study

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  • Dongsheng Chen

    (State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China
    Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

  • Wei Zheng

    (State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China
    CNOOC Research Institute Ltd., Beijing 100028, China)

  • Taichao Wang

    (State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China
    CNOOC Research Institute Ltd., Beijing 100028, China)

  • Fan Liu

    (State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China
    CNOOC Research Institute Ltd., Beijing 100028, China)

  • Tong Cheng

    (Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

  • Hengyuan Chen

    (Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

  • Tingting Miao

    (Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

Abstract

The desorption of heavy oil is one of the important indicators affecting the development efficiency of the remaining oil in nanopores. However, the study of the adsorption and diffusion mechanisms of heavy oil molecules in nanopores remains scarce. In this work, the influences of temperature on the adsorption and diffusion properties of the heavy oil four-fractions in quartz nanopore have been investigated via molecular dynamics simulations. Our results show that the heavy oil molecules will form a denser multilayer adsorption oil layer on the nanopore surface, and high temperature can alter the adsorption behaviors of the heavy oil four-fractions. As the temperature increases, the saturate molecules are desorbed from the nanopore surfaces, but the aromatic, resin, and asphaltene molecules maintain a tendency to aggregate towards the nanopore surface. In particular, the agglomeration behaviors of most saturate, aromatic and asphaltene molecules in nanopore can be suppressed by the confined space compared with the heavy oil molecules in oil droplet. In addition, the influence of temperature on the movement of heavy oil molecules in nanopore decreases compared with the oil molecules in a heavy oil droplet due to the confined space and adsorption effect. Interestingly, there is a competition phenomenon between the adsorption and diffusion of aromatic, resin, and asphaltene molecules in the nanopore, resulting in different adsorption behaviors with the increase in temperature. The results obtained in this paper will provide molecular-level theoretical guidance for understanding the adsorption and desorption mechanisms of heavy oil in nanopores.

Suggested Citation

  • Dongsheng Chen & Wei Zheng & Taichao Wang & Fan Liu & Tong Cheng & Hengyuan Chen & Tingting Miao, 2022. "Influence of Temperature on the Adsorption and Diffusion of Heavy Oil in Quartz Nanopore: A Molecular Dynamics Study," Energies, MDPI, vol. 15(16), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5870-:d:887174
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    References listed on IDEAS

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    1. Li, Songyan & Han, Rui & Wang, Peng & Cao, Zijian & Li, Zhaomin & Ren, Guangwei, 2022. "Experimental investigation of innovative superheated vapor extraction technique in heavy oil reservoirs: A two-dimensional visual analysis," Energy, Elsevier, vol. 238(PC).
    2. Zhong, Jie & Wang, Pan & Zhang, Yang & Yan, Youguo & Hu, Songqing & Zhang, Jun, 2013. "Adsorption mechanism of oil components on water-wet mineral surface: A molecular dynamics simulation study," Energy, Elsevier, vol. 59(C), pages 295-300.
    3. Ahmadi, Mohammadali & Chen, Zhangxin, 2022. "Molecular dynamics simulation of oil detachment from hydrophobic quartz surfaces during steam-surfactant Co-injection," Energy, Elsevier, vol. 254(PC).
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