强碱三元复合驱储层物性变化特征研究

三元复合驱技术是油田高含水后期进一步提高采收率的重要手段，但是强碱三元复合驱后对于的储层的伤害是不容忽视的，为了更好的研究微观孔隙变化情况我们通过微观孔隙实验利用原子力显微镜和OCA接触角测定仪对于空隙结构变化以及接触角进行了检测和详细分析。结果表明：三元复合驱后，储层岩石向中性润湿变化，Ca2+与阴离子活性剂间的结合作用有可能使硅石表面从水湿向油湿转化，表面活性剂对油藏岩石的润湿作用受地层水中无机离子协同作用的影响。

Research on Reservoir Physical Property Changes of Strong Alkaline ASP Flooding

ASP flooding is an important approach to further increase recovery of a late stage high water cut oil field, but the damage to reservoir after ASP flooding cannot be neglected. In order to better investigate micropore changes, we have detected and analyzed in detail the pore structure changes and contact angle utilizing AFM (atomic force microscope) and optical contact angle meter through the micro pore experiment. The results show that: the wettability of reservoir rock turn to neutral wetting after the asp flooding, the combination of Ca2 +and anionic surfactant may make silica surface water to wet from oil wet transformation. Surfactant on the reservoir rock wetting role by stratigraphic water inorganic ions synergy effect.