Structural characterization and rheological properties of modified nano-SiO<sub>2</sub> oil repellents

化学工业与工程

Chemcial Industry and Engineering

2023, Vol. 40

Issue (5) :76-82 DOI: 10.13353/j.issn.1004.9533.20210850

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Structural characterization and rheological properties of modified nano-SiO₂ oil repellents

LU Xiaobing^1,2, ZHENG Lijun², CHEN Jianuo³, ZHANG Man³, QU Jin⁴, LIU Xiaofei⁴, TANG Zhongli³

1. School of Chemical and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023, China;
2. Oil and Gas Process Research Institute of Changqing Oilfield Branch, Xi'an 710018, China;
3. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
4. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China

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Abstract To improve oil recovery significantly in low permeability reservoirs, nanofluids are favored by researchers for mobility control, wettability modification properties, as well as good temperature, salt, and shear resistance compared to conventional polymer drives. The structure and properties of modified silica (SiO₂) were characterized and the apparent viscosity of its nanofluid was measured under different conditions through a series of experiments, and the effects of temperature, nanoparticle concentration and mineralization on the rheological properties of modified SiO₂ nanofluid were investigated. Experiments showed that the modified nano-SiO₂ had excellent stability and small average particle size of 22.92 nm, as well as a certain cross-linked structure. The apparent viscosity decreased with increasing temperature; moreover, with the increase of nanoparticle concentration, the apparent viscosity of first increasing and then decreasing, and the solution with the concentration of 0.5% showed the greatest viscosity at high shear rate, with a maximum of 1.833 mPa·s; as salinity increased, the apparent viscosity of the solution decreased. Through the study of modified SiO₂ nanoparticles, they had favorable properties of temperature resistance, salt resistance, shear resistance and control the fluidity of the injected fluid, which has a certain positive significance for enhancing oil recovery.

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	LU Xiaobing
	ZHENG Lijun
	CHEN Jianuo
	ZHANG Man
	QU Jin
	LIU Xiaofei
	TANG Zhongli

Keywords： modified SiO₂ nanoparticles rheological properties apparent viscosity

Received 2021-11-26;

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LU Xiaobing, ZHENG Lijun, CHEN Jianuo, ZHANG Man, QU Jin, LIU Xiaofei, TANG Zhongli.Structural characterization and rheological properties of modified nano-SiO₂ oil repellents[J] Chemcial Industry and Engineering, 2023,V40(5): 76-82

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