低渗透油藏活性水驱油物理模拟实验研究

The Laboratory Study on Oil Displacement with Activated Water in Low Permeability Reservoirs

针对低渗透油藏的孔隙细小、结构复杂、注水压力高、采收率低、开发效果差的特点,采用低界面张力的活性水进行驱油。以活性水与原油间的界面张力为评价手段,选用了7种不同类型的表面活性剂进行初步筛选。以驱油含水率、注入压力及最终采收率作为评价手段,进行室内物理模拟驱油实验。结果表明,在相同的实验条件下,选用十二烷基苯磺酸钠做活性剂,其水溶液与原油形成的界面张力较低,当活性水浓度为0.3%,注入量为0.3PV,活性水注入时机选择含水率达到51%后注入活性水,活性水驱油效果较好。

Based on the problems of low porosity factor,complexstructure,high water pressure,poor oil recovery and unsatisfactory development results in low-permeability reservoirs,the activated water with low interfaeial tension was applied in the reservoirs.The interfacial lension between the activated water and crude oil was acted as evaluation scale,7 different types of surface active agents screened initially.The oil moisture content,injection pressure and ultimate recovery were made as evaluation criterions for the simulation flooding experiments.The results showed that interfacial tension between the water solution of sodium dodecylbenzene sulfonate and the oil was lower.In order to get desired flooding effect the activated water content was in 0.3%,the injection volume in 0.3 PV,the opportune moment for injecting in the moisture content under 51%.