空气泡沫在孔隙介质中的渗流特征研究

Flow Characteristics of Air Foam in Porous Medium

刘 露 李华斌 吴 灿 梁艳萍

LIU Lu LI Huabin WU Can LIANG Yanping

泡沫最佳体系为：0.5%的ZY起泡剂(石油磺酸盐)+空气，气液体积比1.2:1。此时的起泡体积400 mL，泡沫半衰期540 s，泡沫视黏度1210 mPa·s。根据达西定律及质量守恒定律，推导出空气泡沫体系在孔隙介质中渗流时不同测压点的有效黏度μX数学表达式；并根据岩心孔喉直径及泡沫渗流线速度得到泡沫渗流时的剪切速率γ；拟合得到泡沫驱油体系在孔隙介质中渗流时的μX与γ的关系式为μX=Kγn-1，稠度系数K为375.94，幂律指数n为0.33。

The optimum foam system was composed of 0.5% foaming agent ZY (petroleum sulfonate) and air in gas liquid volume ratio1.2:1. The foam’s volume was 400 mL, foam half-life was 540 s and apparent viscosity of foam was 1210 mPa·s. The mathematical expression of effective viscosity μX of air foam penetrating in pour medium at different sites on compacted sand stones spacing normalized from injection was deduced based on the Darcy and quantity balance laws. And the shear rate of γ foam penetrating was deduced according to the core pore throat diameter and the foam seepage velocity. Moreover, it was calculated that the relationship between μX and γ when the foam system was flooding in porous media. And the mathematical expression was μX=Kγn-1 . The consistency factor was 375.94 and the power law index was 0.33.