Foam has shown promising characteristics for soil remediation, especially as a blocking agent. In very permeable porous media, high groundwater velocity reduces the efficiency of in situ remediation by decreasing the contact time with contaminants. To use foam to reduce water velocity, this paper investigates its properties in very permeable porous media (> 4.10−10 m2). Alpha olefin sulfonate foam injection experiments were conducted in columns containing glass beads or sand, with varying permeabilities and injection techniques. Pressure and mass balance data were acquired to measure foam resistance factor and liquid saturation. The results show that foam pregeneration is mandatory for generating a highly viscous foam in highly permeable porous media. However, the permeability of the foam generator does not affect the results within the range studied. Pregeneration generated highly viscous foam, even in very high permeable porous media (> 10−9 m2). The influence of permeability on the apparent viscosity of foam in porous media was related to the shear-thinning foam behavior. These experimental results show that foam injection is a relevant method for water blocking and mobility control in highly permeable porous media.

中文翻译：

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泡沫在高渗透多孔介质中流动修复土壤的实验研究

泡沫已显示出用于土壤修复的有希望的特性，尤其是作为封闭剂。在渗透性非常强的多孔介质中，高地下水流速会减少与污染物的接触时间，从而降低原位修复的效率。为了使用泡沫来降低水流速度，本文研究了其在渗透性非常强的多孔介质 (> 4.10−10 m2) 中的特性。α 烯烃磺酸盐泡沫注射实验在含有玻璃珠或沙子的柱子中进行，具有不同的渗透率和注射技术。获取压力和质量平衡数据以测量泡沫阻力系数和液体饱和度。结果表明，要在高渗透性多孔介质中生成高粘性泡沫，必须进行泡沫预生成。然而，泡沫发生器的渗透性不会影响研究范围内的结果。即使在渗透性非常高的多孔介质 (> 10−9 m2) 中，预生成也会产生高粘性泡沫。渗透率对多孔介质中泡沫表观粘度的影响与泡沫剪切稀化行为有关。这些实验结果表明，泡沫注入是一种在高渗透性多孔介质中进行阻水和流度控制的相关方法。