高温蒸汽氮气泡沫复合驱实验研究（）　　摘要：　　关键词：　　中图分类号：TE357

Laboratory experiments of high-temperature steam and nitrogen foam compound flooding

孙焕泉 王敬 刘慧卿 杨耀忠 彭国红 赖书敏

SUN Huanquan WANG Jing LIU Huiqing YANG Yaozhong PENG Guohong LAI Shumin

中国石化胜利油田分公司，山东东营　257001 中国石油大学石油工程教育部重点实验室，北京　102249

Shengli Oil Field Company, SINOPEC, Dongying 257001, China Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China

为了研究不同因素对泡沫封堵特性和高温蒸汽氮气驱提高采收率效果的影响，开展了发泡剂浓度、温度、气液比、渗透率和含油饱和度对3种发泡剂生成泡沫封堵能力影响规律、发泡剂浓度和蒸汽氮气混注比对蒸汽泡沫复合体系封堵特性影响以及不同发泡剂单管和双管驱油实验。研究结果表明，泡沫阻力因子随发泡剂浓度、气液比、渗透率增加而增大，后期增加速度较缓，最佳质量分数和气液比为0.5%和1∶1；阻力因子随含油饱和度增加而减小，含油饱和度大于0.2时，泡沫基本失去封堵能力；1#、2#发泡剂生成泡沫的阻力因子随温度增加而降低，3#随温度增加而升高；蒸汽氮气泡沫混注时，最佳质量分数和蒸汽氮气混注比为0.6%和3∶2；注2#和3#发泡剂的蒸汽氮气泡沫复合驱提高采收率20.82%和17.05%；2#发泡剂提高波及系数和洗油效率为13%和24.6%，3#发泡剂提高波及系数和洗油效率为9.05%和21.9%，2#发泡剂性能优于3#发泡剂。

In order to study the influences of different factors on plugging property of foams and oil recovery enhance effect of high-temperature steam and nitrogen flooding, the effects of foaming agents concentration, temperature, gas-liquid ratio, permeability and oil saturation on the plugging ability of 3 foaming agents, the effects of foaming agent concentration and the ratio of steam and nitrogen on the plugging poverty of steam - nitrogen foam compound flooding system and the flooding tests of various foaming agents in single pipe and dual-pipe were all studied by experiments. The results indicated that the foam resistance factor increased with the increase of the concentration, gas-liquid ratio and permeability and the trend slowed down in the later period of experiments. The optimal concentration was 0.5% and the optimum gas-liquid ratio was 1:1. On the other hand, the resistance factor reduced with the oil saturation increasing and the foam lost its plugging ability when the oil saturation was greater than 0.2. The resistance factors of 1# and 2# foaming agents dropped with temperature added, but that of 3# increased. The suitable mass fraction was 0.6% and the ratio of steam to nitrogen was 3:2 for steam and nitrogen foam flooding. The oil recovery of 2# and 3# foaming agents increased by 20.82% and 17.05% respectively. In the process of steam and nitrogen foam flooding, the increased sweep efficiency and displacement efficiency of 2# were 13% and 24.6% while those of 3# were only 9.05% and 21.9%; therefore the performance of agent 2# is superior to that of 3#.