沥青质、胶质和石油酸对乳状液相变与界面性质的影响研究

doi:10.3969/j.issn.2097-2806.2025.09.006

Abstract

Abstract:

The effects of asphaltene （AS）, resin （RE） and petroleum acid （PA） in crude oil on the interfacial behavior of emulsions were investigated. The interfacial tension, dilational modulus, phase transition points and droplet size distribution were analyzed. The results showed that, among the components studied, AS exhibited the highest interfacial tension （25.1 mN/m）, followed by RE （23.7 mN/m）, while PA exhibited the lowest interfacial tension （4.8 mN/m）. The fast adsorption kinetics of PA at the oil-water interface significantly decreased the interfacial tension, highlighting its strong surface activity. AS exhibited the highest dilational modulus （38.7 mN/m）, which strengthened the elasticity of the oil-water interfacial film and postponed the phase transition point. In contrast, PA, with a low dilational modulus of 6.1 mN/m, reduced the emulsion stability by decreasing interfacial elasticity and promoting droplet coalescence, leading to an earlier phase transition at water content of 60%. The synergism between RE and AS significantly increased the viscosity and stability of the emulsion, whose water content at the phase transition point was between 70% and 80%. This work might provide theoretical basis for improving oil recovery efficiency and modulating emulsion stability in oilfield applications.

Key words: emulsion, interfacial tension, dilational modulus, phase transition point, emulsion droplet size

CLC Number:

TE39

Chao Tang, Jiaojiao Guan, Shouping Zhang, Wenliang Cai, Yulian Lin, Shuixiang Xie, Yunfei Xiang. Effects of asphaltene, resin, and petroleum acid on the phase transition and interfacial properties of emulsions[J].China Surfactant Detergent & Cosmetics, 2025, 55(9): 1129-1136.

Figures/Tables 9

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References 27

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组分	平均粒径/μm
组分	40%	50%	60%	70%	80%
AS	6.3	7.2	8.2	7.8	8.0
RE	5.4	7.2	8.4	8.3	8.3
PA	4.5	5.6	5.2	4.8	4.2
m（AS） ∶m（RE）=1∶1	7.4	8.2	8.1	6.9	6.9
m（AS） ∶m（PA）=1∶1	4.9	4.9	4.7	7.6	6.4
m（AS） ∶m（RE） ∶m（PA）= 1∶1∶1	4.4	5.4	5.6	5.4	5.1
m（AS） ∶m（RE） ∶m（PA）= 1∶5∶1	5.6	5.1	4.4	4.7	4.3

Effects of asphaltene, resin, and petroleum acid on the phase transition and interfacial properties of emulsions

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实验编号	w（AS）/%	w（RE）/%	w（PA）/%	w（模拟油）/%	相变点含水率/%	界面张力/（mN/m）
1	30	0	0	70	70	25.1
2	0	30	0	70	70	23.7
3	0	0	30	70	60	4.8
4	15	15	0	70	75	23.1
5	7.5	22.5	0	70	80	18.6
6	5	25	0	70	70	22.5
7	15	0	15	70	60	7.2
8	7.5	0	22.5	70	60	5.6
9	5	0	25	70	60	5.4
10	10	10	10	70	60	10.2

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