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

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