DW油藏表面活性剂聚合物驱先导试验评价

Evaluation on Surfactant Polymer Flooding Pilot in DW Reservoir

DW油藏是一个以中高孔中高渗储层为主的浅层复杂断块油藏,其地层水矿化度高,地层温度低。该油藏目前水驱采收率油低,化学驱提高该油藏采收率潜力大。本文开展了表面活性剂聚合物二元驱先导试验评价,室内实验筛选了适合DW油藏地层水矿化度高特点的表面活性剂和聚合物,测试了表面活性剂和聚合物的性能参数,优化了注入质量浓度、注入段塞尺寸等。对表面活性剂聚合物二元驱筛选出的现场先导试验井组105-8X,建立了该井组地质模型及油藏模拟模型,并对其生产历史进行了模拟拟合,得到了较好拟合结果。用拟合好的模型以及优选出的表面活性剂和聚合物体系的物理参数,对该井组进行了化学驱模拟计算。结果表明:在试验井组105-8X使用该体系驱油可提高采收率4.0%。

DW reservoir is a shallow complex reservoir with middle and high permeability and high salinity of formation water,low formation temperature.The current oil recovery rate of this reservoir by waterflooding is low,but the potential of chemical flooding to increase the recovery rate of this reservoir is large.In this paper,the evaluation on pilot test of surfactant polymer flooding was carried out.The polymers and surfactants were screened and their performance parameters were tested in lab experiments,and the injection concentration,injection slug size of the pilot were optimized.A geological model and reservoir simulation model of the selected field pilot test well group 105-8 X,were established,and its production history was fitted,and good fitting results were obtained.The chemical flooding simulation of the well group was performed by using the fitting model and the physical parameters of selected polymer and surfactant system.The evaluation showed that the incremental oil recovery in the pilot well group could be 4.0%.