Abstract:A series of column experiments were conducted to investigate the transport characteristics of foam in unsaturated porous media and influences of foam quality, foam injection rate, and media permeability on the injection pressure. The results indicated that the foam front, liquid-wetting front, and foam gas front were separated during the transport in porous media and their relationship of transport rate is foam gas front > liquid-wetting front >foam front. The foam transport had a retardation of 2.0 relative to the gas flow. The pressure primarily occurred and uniformity distributed in the foam-occupied region, and the pressure showed a linear increasing trend over time in a certain location. The calculated effective foam viscosity in 1-1.2 mm porous media was 85.49 mPa s, which was 84.64 times greater than the viscosity of water into the same sediment. Due to the higher effective foam viscosity, the greater injection pressure was needed. The influences of media permeability on foam injection pressure mainly depend on the foam injection rate. Foam injection pressure decreased with increment of media permeability while the foam injection rate was same in per unit area. When the foam quality was 91.4%, the pressure gradient increased from 26.95 psi/m to 30.74 and 46.40 psi/m when the foam injection rate increased from 2.1mL/min to 3.2 and 4.4 mL/min, respectively. When the foam injection rate was 3.2mL/min, the pressure gradient increased from 30.16 psi / m to 30.74 and 34.57 psi/m when the foam quality reduced from 93.5% to 91.4% and 88.2%, respectively. Both foam quality and foam injection rate exert impact on injection pressure, however, foam injection rate has a more profound influence than foam quality on injection pressure.
苏燕, 赵勇胜, 李璐璐, 秦传玉, 王冬梅, 杨帅. 多孔介质中泡沫的迁移特性和影响因素研究[J]. 中国环境科学, 2015, 35(3): 817-824.
SU Yan, ZHAO Yong-Sheng, LI Lu-Lu, QIN Chuan-Yu, WANG Dong-Mei, YANG Shuai. Study on transport characteristics of foams and affecting factors in porous media. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(3): 817-824.