ZY空气泡沫的性能及流速对渗流特性的影响

Characteristics of ZY Air Foam and the Influence of Flow on Seepage

吴 灿 李华斌 牛忠晓 黄 浩 霍隆军 孙 千 陈 健 梁艳萍

WU Can LI Hua-Bin NIU Zhong-Xiao HUANG Hao HUO Long-Jun SUN Qian CHEN Jian LIANG Yan-Ping

中原油田采油工程技术研究院提供的阴离子型起泡剂ZY，有效物含量30%，其最佳加量为0.5%，此时的发泡体积为400 mL，泡沫半衰期为540 s，泡沫综合指数为216 L·s，泡沫视黏度为1210 mPa·s。通过岩心驱替实验研究了渗流速率对ZY空气泡沫在孔隙介质中渗流特性的影响。结果表明，ZY空气泡沫在孔隙介质中渗流时产生泡沫的临界起泡线速度为0.3 m/d。当渗流线速度从0.3增至1 m/d时，泡沫的平均阻力系数（整支填砂管）由14增至64；渗流速度大于1 m/d后，平均阻力系数约为70，泡沫的封堵能力受渗流速率的影响较小；填砂管前端泡沫的封堵能力大于后端泡沫，泡沫在孔隙介质运移过程中不断的生成和破灭，起泡速度总是小于消泡速度，直至泡沫完全消失。

The anionic foaming agent ZY with 30% effective content was provided by production engineering and technology institute in Zhongyuan oilfield. When the best dosage of ZY was 0.5%, the foam volume was 400 mL, foam half-life was 540 s, foam composite index was 216 L·s, and the viscosity of foam was 1210 mPa·s. The core flooding experiment result showed that the seepage rate had an important influence on the characteristics of ZY in porous media. The smallest line speed to make ZY foam in porous media was 0.3 m/d. When the line speed increased from 0.3 to 1 m/d, the resistance coefficient in average (the whole sand filling tube) of foam system increased from 14 to 64. The average resistance coefficient was about 70 when the line speed was above 1 m/d which indicated that the seepage rate had less effect to foam plugging capacity. The plugging capacity of foam in front-end of filling sand tube was bigger than that in back-end. Foam continuously generated and decay when it transported in porous media, and the blistering speed was always less than defoaming speed until the foam completely disappeared.