CO2对长庆采出油水物性影响及乳状液稳定机理

doi:10.3969/j.issn.2097-2806.2023.06.002

Abstract

Abstract:

Carbon dioxide （CO₂） flooding has become an important means to improve the recovery efficiency of low-permeability oil fields, with the advantages including wide range of application, low production cost and high oil-washing efficiency. However, due to the special physical and chemical properties of CO₂, the stability of corresponding produced liquid is significantly enhanced compared with that of conventional water flooding, which brings many difficulties to the treatment of produced liquid. By means of optical microscope, dynamic light scattering, rheology and other methods, the effects of CO₂ treatment on the physical properties of Changqing crude oil and produced water under different pressures and the stability of the water-in-oil （W/O） emulsion were studied, and the factors affecting the emulsification and stability of the produced liquid from CO₂ flooding were studied. The results showed that, with the increase of CO₂ pressure, the mass concentrations of Ca²⁺and Mg²⁺ ions in produced water for CO₂ flooding were decreased, while the overall content of CO₃^2- and HCO₃^- ions was increased, and the pH value of the water phase was slightly decreased, changing from weak alkalinity to weak acidity. CO₂ treatment led to the decrease of light components and the increase of heavy components （such as resins and asphaltenes） in crude oil, and the enhancement of crude oil polarity. The abnormal temperature and wax precipitation point of the crude oil after CO₂ treatment were both increased, and the viscosity of the crude oil was increased. After CO₂ treatment, the droplet size of W/O emulsion became smaller, and its homogeneity was enhanced. The particle size changed from 2.14 μm to 0.61 μm. As the viscosity of the emulsion was increased and the resins, asphaltenes and the particles in water adsorbed on the oil-water interface to form a film, the strength of the interfacial film was improved and the stability of the emulsion was thus enhanced. The clarification of emulsion stabilization mechanism could provide theoretical guidance and technical support for treatment process to the produced liquid from CO₂ flooding.

Key words: CO₂ flooding, emulsion, stability, physical properties of crude oil, rheology

CLC Number:

O648.23

Wang Huazheng, Zhang Liang, Kang Xin, Kang Wanli, Li Zhe, Yang Hongbin. Effect of CO₂ on physical properties of produced oil and water in Changqing and emulsion stabilization mechanism[J].China Surfactant Detergent & Cosmetics, 2023, 53(6): 617-624.

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压力/MPa	阳离子含量/（mg/L）			阴离子含量/（mg/L）			pH值	电导率/（μS/cm）
压力/MPa	Ca²⁺	Mg²⁺	Na⁺	Cl^-	CO₃^2-	HCO₃^-	pH值	电导率/（μS/cm）
0	1 505.71	1 761.22	26 597.77	49 594.84	421.84	1 129.27	7.25	16.62
2	1 483.62	1 698.74	25 948.47	48 348.71	363.45	1 247.56	6.99	13.42
10	1 355.14	1 514.65	24 735.86	45 627.25	189.62	1 806.83	5.81	7.81

样品	w（饱和烃）/%	w（芳香烃）/%	w（胶质）/%	w（沥青质）/%	w（胶质+沥青质）/%
CO₂处理前	74.5	18.8	6.1	0.6	6.7
CO₂处理后	71.7	19.6	7.5	1.2	8.7

Effect of CO₂ on physical properties of produced oil and water in Changqing and emulsion stabilization mechanism

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Effect of CO2 on physical properties of produced oil and water in Changqing and emulsion stabilization mechanism

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Effect of CO₂ on physical properties of produced oil and water in Changqing and emulsion stabilization mechanism