空气泡沫驱油技术在低渗透油藏中的应用研究

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。

Application of Air-Foam Flooding Technology in Low Permeability Reservoir

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.