高温油藏改性纳米SiO2增效体系的制备及驱油效果研究

doi:10.3969/j.issn.2097-2806.2026.01.006

Abstract

Abstract:

To meet the needs for nano-oil displacement agents in the development of high-temperature reservoirs, in this work, nano-SiO₂ was modified with silane coupling agent dodecyltriethoxysilane. The temperature-resistant modified nano-SiO₂ was optimized by using the reduction of interfacial tension as evaluation index. The modified nanomaterial was analyzed by infrared spectroscopy, and the microstructure and particle size thereof were characterized by transmission electron microscopy and dynamic light scattering, respectively. Then, a surfactant with good compatibility with modified nano-SiO₂ was selected among several surfactants of different types by dispersion to construct a synergistic system. The interfacial tension and wetting ability of the constructed synergistic system were evaluated on an interfacial tensimeter and a contact angle meter. Finally, the microscopic oil displacement experiment was carried out by means of microscopic visualized displacement model. The results showed that when the reaction time was 40 h, the reaction temperature was 60 °C, and the amount of the modifier was 16%, the oil-water interfacial tension of the modified nano-SiO₂ reached 6.081 7 mN/m, and the particle size of the modified nano-SiO₂ was 122 nm. According to dispersibility, the surfactants HN and allyloxy polyethyleneglycol （APEG） with good compatibility with modified nano-SiO₂ were selected. The test results of interfacial tension and wetting ability showed that the modified nano-SiO₂/HN composite system had better performance. The modified nano-SiO₂/HN system had good abilities to reduce the interfacial tension and change the water-phase contact angle under the conditions of reservoir temperature of 160 °C and salinity of 35 000 mg/L. The results of microscopic displacement experiments showed that the oil recovery of modified nano-SiO₂/HN system was 21.1% higher than that of water flooding. This research could provide scientific support and theoretical basis for the application of this kind of synergistic system.

Key words: modified nano-SiO₂, surfactant, interface tension, wetting ability, oil displacement effect

CLC Number:

TQ423

Li Wang, Yanan Hou, Bumin Guo, Jian Zhao, Wenhui Bao, Jinwei Shen. Preparation of a synergistic system with modified nano-SiO₂ for high-temperature oil reservoirs and its oil displacement effect[J].China Surfactant Detergent & Cosmetics, 2026, 56(1): 48-54.

Figures/Tables 7

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References 22

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表面活性剂	w/%
表面活性剂	0.1	0.2	0.3
十二烷基三甲基溴化铵	浑浊	浑浊	浑浊
十二烷基磺酸钠	浑浊	浑浊	浑浊
石油磺酸盐	浑浊	浑浊	浑浊
N,N-二甲基十六烷基胺	浑浊	浑浊	浑浊
HN	澄清	澄清	澄清
烯丙氧基聚氧乙烯醚（APEG）	澄清	澄清	澄清
司班20	浑浊	浑浊	浑浊

Preparation of a synergistic system with modified nano-SiO₂ for high-temperature oil reservoirs and its oil displacement effect

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Preparation of a synergistic system with modified nano-SiO2 for high-temperature oil reservoirs and its oil displacement effect

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Preparation of a synergistic system with modified nano-SiO₂ for high-temperature oil reservoirs and its oil displacement effect