胶态微泡沫用于冲洗含水层的迁移分布特征

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Abstract At present, the migration and distribution characteristics of colloidal gas aphrons (CGAs) during the flushing of aquifers are not clear. In this study, the effects of injection rate, surfactant concentration and media conditions on the spatial and temporal variation characteristics of the migration and distribution of CGAs were investigated in detail using two-dimensional simulation experiments. The results showed that under single-point and single-side injection conditions, the shape of the sweeping area of CGAs was approximately semi-circular, and the migration front was relatively regular. Besides, the foam liquid generated by the bursting of CGAs was distributed around its migration front, and the foam gas migrated upward due to the influence of groundwater buoyancy, resulting in the "drift up" phenomenon that the upward migration distance in the vertical direction was greater than the downward migration distance. As for surfactant concentration, it had little effect on the migration and distribution of CGAs. When the injection velocity was low or the permeability of the media was poor, CGAs appeared an obvious "drift up" phenomenon in the later stage of migration, at the same time, the shape of the sweeping area gradually tended to be semi-elliptical. There was a maximum sweeping area in the aquifer when CGAs were injected at a constant flow. In all, compared with traditional liquid flushing fluids, the migration and distribution of CGAs in the heterogeneous aquifer was relatively uniform and less affected by the heterogeneity of the media.

Key words： colloidal gas aphrons (CGAs) aquifer migration and distribution affecting factors

Received: 22 June 2020

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X523

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	Articles by authors
	HE Yu
	GUO Chao
	FU Yu-feng
	ZHANG Cheng-wu
	ZHANG Jing-yi
	QIN Chuan-yu

Cite this article:

HE Yu,GUO Chao,FU Yu-feng等. The migration and distribution characteristics of colloidal gas aphrons during its flushing of aquifer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 720-726.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/720

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