Abstract: Aiming at the problem that traditional surfactant flooding couldn't adjust to the fractured reservoir, polymer gel and surfactants combination flooding were proposed. The combination flooding could make use of the high resistance factor of polymer gel after gelation, driving the surfactants into the low permeability area and improving the whole oil recovery. A kind of polymer gel LHGEL with the advantage of slow crosslink and easy injection was developed. The effects of gelling properties of polymer gel and compatibility with surfactant were researched. The EOR capability was evaluated with the fractured core flooding experiments. The results showed that the gelling properties of polymer gel LHGEL were affected mostly by salinity and temperature, where the higher the temperature, the higher the salinity, the shorter gelling time, the greater the gelling strength. Surfactant LHPS and polymer gel LHGEL after gelation had great compatibility. The combination flooding can improve the oil recovery by 22.1% on the basis of water flooding at 50 ℃ with 10 000 mg/L of salinity, and the combination system had promising applications in fractured reservoirs.

Key words: Surfactant,   ,  Fractured reservoir,    , Polymer gel,    ,  Gelling properties,   ,  Compatibility

摘要： 针对表面活性剂驱在裂缝性油藏中驱油效果差的特点, 提出了聚合物凝胶/表面活性剂组合调驱技 术, 该技术可利用聚合物凝胶成胶后的高阻力因子, 使注入的表面活性剂易进入未水洗层段, 提高整体的驱油效率。 本文研制了一种缓交联、 易注入的聚合物凝胶 LHG E L, 评价了其成胶性能的影响因素, 并与矿场用的表面活性剂 LHP S进行了配伍性实验, 最后借助裂缝性岩心驱油实验评价了组合调驱体系的提高采收率能力。结果表明, 聚合 物凝胶LHG E L的成胶性能受矿化度和温度的影响较大, 其中温度越高, 矿化度越高, 聚合物凝胶的成胶时间越短, 成胶强度越大。表面活性剂LHP S和成胶后的聚合物凝胶LHG E L的配伍性好, 在油藏温度5 0℃, 矿化度1 00 0 0 m g / L条件下, 组合调驱体系可大幅度提高裂缝性岩心的采收率, 在水驱基础上提高采收率幅度达2 2. 1%。该驱油 体系在裂缝性油藏具有广泛的应用前景。

关键词: 表面活性剂, 裂缝性油藏,  , 聚合物凝胶,  , 成胶性能, 配伍性