纳米二氧化硅微乳液的制备及其控水性能研究

doi:10.19964/j.issn.1006-4990.2023-0031

Abstract

Abstract:

An oil in water microemulsion with excellent oil-water selectivity was developed by mechanical emulsification method using nano-SiO₂，water-soluble non-ionic surfactant NSW，oil soluble non-ionic surfactant NSO，mineral oil and deionized water as raw materials.The microstructure，texture microemulsion microstructure of nano-SiO₂ were analyzed by scanning electron microscopy，transmission electron microscopy，low temperature liquid nitrogen adsorption-desorption，thermogravimetric differential thermal analysis，laser particle size analysis，cryogenic scanning electron microscopy and contact angle test，and the core displacement plugging performance was evaluated.The results showed that the initial particle size of the micro lotion was D₅₀=3.343 µm and the core permeability reached 4 700 mD，the water phase plugging rate was 88% and oil phase plugging rate was 0.When the core permeability was about 1 200 mD，the water phase plugging rate was as high as 92%，and the oil phase plugging rate was 12%.The microemulsion had a very good selective plugging effect，and could be applied to the field of oil stabilization and water control.

Key words: nano-SiO₂, microemulsion, water shutoff

CLC Number:

TQ127.2

DENG Changhong. Preparation of nano silica microemulsion and its water control performance[J]. Inorganic Chemicals Industry, 2023, 55(5): 71-77.

Figures/Tables 13

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References 21

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元素	w（C）/%	w（O）/%	w（Si）/%
无SiO₂微乳液	71.89	27.72	0.39
含纳米SiO₂微乳液	68.06	22.12	9.82

组别	岩心号	驱替介质	原始渗透率/mD	驱替渗透率/mD	封堵率/%
1	1	地层水	4 700	522	88
1	2	柴油	4 756	4 756	0
2	3	地层水	1 220	98	92
2	4	柴油	1 218	1 069	12

岩心渗透率/ mD	注入速率/ （mL·min^-1）	矿化度/ （mg·L^-1）	材料类型	乳液类型	温度/ ℃	堵水率/ %	选择性	文献
3 847	—	—	SiO₂	W/O	75	96.1	有	^[18]
—	—	—	乳化原油	W/O	45	87.3	有	^[19]
900	—	8 800	石蜡	O/W	50	92.5	有	^[20]
5 000	1	0	液态石蜡	O/W	24	93.0	无	^[21]
1 220	1	40 000	SiO₂	O/W	90	92.0	有	本研究

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Preparation of nano silica microemulsion and its water control performance

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