低渗透油藏泡沫驱影响因素分析

Influential Factors Analysis of Foam Looding in Low Permeability Reservoirs

根据低渗透油藏的开发特征,对比分析了各种改善低渗透油藏开发效果的提高采收率方法优缺点,得出泡沫驱能提高波及效率和洗油效率,是一种较好的改善低渗透油藏开发效果的开采方法;采用正交试验分析法,在L9(34)正交表中设计了9种方案,进行了某低渗透油藏泡沫驱提高采收率数值模拟研究,分析了注入方式、段塞大小、表面活性剂质量浓度和气液比等因素对原油采收率的影响,优选出泡沫驱油的最优开发方案。与水驱开发方式相比,泡沫驱最优方案能提高原油采收率7.32%。

Low permeability reservoirs are widely distributed in China, and these kinds of reservoirs generallyhave the characteristics of low porosity, low permeability and low recovery. According to development characteris-tics of low permeability reservoirs, the merits and demerits of different kinds of enhancing oil recovery methods wereanalyzed for improving the development effects in low permeability reservoirs. Foam flooding is one better way toimprove the development effects of low permeability reservoirs, which can increase sweeping efficiency and oil dis-placement efficiency. Finally, the orthogonal experiment design was adopted, and 9 cases were designed in L9 （34）orthogonal table, so foam flooding to enhance oil recovery was studied in one low permeability reservoirs. Theeffects of injection mode, slug size, surfactant concentration and gas-liquid ratio on the oil recovery were analyzed,and the optimal development program of foam flooding was optimized. Comparing with water flooding program, theoptimed foam flooding could enchance oil recovery by 7. 32%.