Abstract: The airfoam flooding technology has been applied well in middlehigh permeability reservoirs, however, it is less applied in low permeability reservoirs. The airfoam flooding mechanism and injection mode of low permeability reservoirs were studied throw literature research and the feasibility of airfoam flooding in low permeability reservoir was proceeded by indoor simulation experiment and field test. The results showed that when the residual oil saturation was lower than 20% in the high permeability layer, the foam fluid system can play a very good role and block the high permeability layer. A large number of crude oil in the low permeability layers was displaced during the airfoam flooding stage and the oil displacement efficiency rised from 8.33% to 50.55%. The water content of the field test well group decreased from 98% to 54%, the daily fluid production rate dropped from 3.5 m3 to 1 m3, and the daily oil production increased from 0.07 m3 to 0.46 m3. The airfoam flooding technology has tremendous potential in the development of low permeability reservoirs and has a certain reference function of stabilizing oil output and controlling water content for the similar reservoirs.

Key words: Low permeability reservoir,     ,  Airfoam flooding,     ,  Mechanism of EOR,   ,  Oil displacement efficiency

摘要： 空气泡沫驱油技术在中高渗透油藏中取得了很好的应用效果, 但在低渗透油藏中的应用较少, 通过 文献调研对低渗透油藏空气泡沫驱增油机理和注入方式进行总结, 并结合室内实验以及现场试验对空气泡沫驱技 术在低渗透油藏中进行可行性分析。结果表明, 空气泡沫驱在高渗层的剩余油饱和度低于2 0%时, 泡沫液体系能够 很好地发挥作用, 封堵高渗层, 空气泡沫驱阶段驱替出大量低渗透层中的原油, 驱油效率由水驱阶段的8. 3 3% 升高 至5 0. 5 5%; 矿场井组含水率由9 8%下降至5 4%, 日产液量由3. 5m3 下降至1m3, 日产油量由0. 0 7m3 升高至0. 4 6 m3。空气泡沫驱在低渗透油藏开发中具有巨大潜力, 对同类油藏的增油控水具有一定的借鉴作用。

关键词: 低渗透油藏, 空气泡沫驱,  , 增油机理, 驱油效率