Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene

doi:10.1016/j.cjche.2021.03.019

中国化学工程学报 ›› 2022, Vol. 45 ›› Issue (5): 211-218.DOI: 10.1016/j.cjche.2021.03.019

Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene

Guangchun Song^1,2, Yuanxing Ning^1,2, Yuxing Li^1,2, Wuchang Wang^1,2

1 Shandong Key Laboratory of Oil-Gas Storage and Transportation Safety, College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;
2 State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China

收稿日期:2021-01-12 修回日期:2021-03-30 出版日期:2022-05-28 发布日期:2022-06-22
通讯作者: Guangchun Song,E-mail:upcngh_sgc@163.com;Yuxing Li,E-mail:lyxupc@163.com
基金资助:
This work was supported by National Natural Science Foundation of China (U19B2012, 51974349, 51991363), Fundamental Research Funds for the Central Universities (20CX06098A), and State Key Laboratory of Natural Gas Hydrates (CCL2020RCPS0225ZQN), which are gratefully acknowledged.

Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene

Guangchun Song^1,2, Yuanxing Ning^1,2, Yuxing Li^1,2, Wuchang Wang^1,2

1 Shandong Key Laboratory of Oil-Gas Storage and Transportation Safety, College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;
2 State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China

Received:2021-01-12 Revised:2021-03-30 Online:2022-05-28 Published:2022-06-22
Contact: Guangchun Song,E-mail:upcngh_sgc@163.com;Yuxing Li,E-mail:lyxupc@163.com
Supported by:
This work was supported by National Natural Science Foundation of China (U19B2012, 51974349, 51991363), Fundamental Research Funds for the Central Universities (20CX06098A), and State Key Laboratory of Natural Gas Hydrates (CCL2020RCPS0225ZQN), which are gratefully acknowledged.

摘要/Abstract

摘要： Natural gas hydrates can readily form in deep-water oil production processes and pose a great threat to the oil industry. Moreover, the coexistence of hydrate and asphaltene can result in more severe challenges to subsea flow assurance. In order to study the effects of asphaltene on hydrate growth at the oil–water interface, a series of micro-experiments were conducted in a self-made reactor, where hydrates nucleated and grew on the surface of a water droplet immersed in asphaltene-containing oil. Based on the micro-observations, the shape and growth rate of the hydrate shell formed at the oil–water interface were mainly investigated and the effects of asphaltene on hydrate growth were analyzed. According to the experimental results, the shape of the water droplet and the interfacial area changed significantly after the formation of the hydrate shell when the asphaltene concentration was higher than a certain value. A mechanism related to the reduction of the interfacial tension caused by the absorption of asphaltenes on the interface was proposed for illustration. Moreover, the growth rate of the hydrate shell decreased significantly with the increasing asphaltene concentration under experimental conditions. The conclusions of this paper could provide preliminary insight how asphaltene affect hydrate growth at the oil–water interface.

关键词: Hydrate, Asphaltene, Interface, Growth, Shape

Abstract: Natural gas hydrates can readily form in deep-water oil production processes and pose a great threat to the oil industry. Moreover, the coexistence of hydrate and asphaltene can result in more severe challenges to subsea flow assurance. In order to study the effects of asphaltene on hydrate growth at the oil–water interface, a series of micro-experiments were conducted in a self-made reactor, where hydrates nucleated and grew on the surface of a water droplet immersed in asphaltene-containing oil. Based on the micro-observations, the shape and growth rate of the hydrate shell formed at the oil–water interface were mainly investigated and the effects of asphaltene on hydrate growth were analyzed. According to the experimental results, the shape of the water droplet and the interfacial area changed significantly after the formation of the hydrate shell when the asphaltene concentration was higher than a certain value. A mechanism related to the reduction of the interfacial tension caused by the absorption of asphaltenes on the interface was proposed for illustration. Moreover, the growth rate of the hydrate shell decreased significantly with the increasing asphaltene concentration under experimental conditions. The conclusions of this paper could provide preliminary insight how asphaltene affect hydrate growth at the oil–water interface.

Key words: Hydrate, Asphaltene, Interface, Growth, Shape

Guangchun Song, Yuanxing Ning, Yuxing Li, Wuchang Wang. Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene[J]. 中国化学工程学报, 2022, 45(5): 211-218.

Guangchun Song, Yuanxing Ning, Yuxing Li, Wuchang Wang. Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene[J]. Chinese Journal of Chemical Engineering, 2022, 45(5): 211-218.

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Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene

Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene

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