利用三维网络模型研究滞留聚合物微观分布规律

再利用地下滞留聚合物是聚合物驱之后进一步提高原油采收率的新途径。基于油水两相流网络模拟模型,综合考虑聚合物渗流机理建立起聚合物驱微观模拟模型。用微观数值模拟手段研究了地下滞留聚合物分布规律及影响因素,为有效地开采聚合物驱后剩余油、合理利用滞留地下聚合物提供必要的依据。模拟结果表明,由于吸附和捕集作用将引起大量聚合物滞留在孔喉中,滞留聚合物占注入聚合物的61.7%。总体上看,大孔喉中聚合物滞留量较大,但滞留聚合物浓度较小。孔喉半径和形状因子为聚合物滞留的主要影响因素,孔喉滞留聚合物浓度与孔喉半径和形状因子平方根的乘积成反比。

Research on retained polymer distribution laws by three-dimension network model

Re-use of retained polymer underground is a new method of enhanced oil recovery(EOR) after polymer flooding.Based on oil-water two phases network simulation model,the microscopic simulation model for polymer flooding was provided together with polymer seepage mechanism.Laws of retained polymer distribution and its influence factors were studied by microscopic numerical simulation,which can provide necessary information for EOR after polymer and proper re-use of retained polymer underground.Simulation results indicate that retained polymer occupies 61.7% of injected polymer because of polymer retention in pore/throat due to absorption and(or) entrapment.The amount of retained polymer in larger pores is larger while with smaller polymer concentration.Pore/throat radius and shape factor are main factors that can influence polymer's retention.The concentration of retained polymer located in pore /throat presents inverse ratio to the product of pore/throat radius and shape factor's square root.