港西三区聚合物/表活剂二元驱注入方式优化研究

化学剂注入方式对提高油藏采收率幅度有着重大的指导作用。为了确定大港油田港西三区油藏最佳的化学剂注入方式,提高其开发效果。针对均质和非均质多孔介质模型,分别设计了7种注入方式的室内流动实验。结果表明:与聚合物驱、表活剂驱相比聚合物/表活剂二元驱注入方式提高采收率的幅度更大;二元驱在均质模型中,其提高采收率幅度为18.1%,高于其他注入方式;在非均质模型中,为21.93%,高于其他注入方式;其在非均质模型高于非均质模型3.83%,更适合于非均质模型。聚合物、表活剂小断塞交替注入方式能够有效降低注入压力。对于改善港西三区油藏采油效果的调整措施,首选二元驱注入方式,其次采用聚合物、表活剂小断塞交替注入方式。

Optimized Study on the Injection Mode of Polymer/Surfactant Binary Flooding for West Areas Reservoir in Dagang Oilfield

:The injection mode of chemical flooding have a significant role in guiding reservoir to enhance recovery rate. In order to determine the best injection mode of chemical flooding for west areas in dagang oilfield reservoir to improve the development effect, this paper has designed respectively seven kinds of injection modes in indoor flow experiments for homogeneous and heterogeneous porous medium model respectively. The results show that : Compared with polymer flooding and the surface active agent flooding, polymer/surfactant Binary Flooding has more larger role in enhance recovery rate;The enhance recovery rate of polymer/surfactant binary flooding is 18.1% in the homogeneous porous medium model.The enhance recovery rate of polymer/surfactant binary flooding is 21.93% n the heterogeneous porous medium model.The difference between them is 3.83%;Based on homogeneous and heterogeneous porous medium model, polymer/surfactant binary flooding has the largest role in enhance recovery rate; Compared with homogeneous porous medium model, polymer/surfactant binary flooding could play its more effectively role in enhance recovery rate for the heterogeneous porous medium model;Alternating injection mode with small plug polymers and surface active agent could effectively reduce the injection pressure;As adjustment measures to enhance recovery rate for west areas in dagang oilfield reservoir, this paper chose polymer/surfactant binary flooding firstly , then chose the alternating injection mode with small plug polymer and surface active agent secondly .