不可及孔隙体积对聚合物段塞注入效果影响研究

摘要

The influence of the inaccessible pore volume on the polymer slug is studied through physical simulation and numerical simulation.For different permeability formations,the optimal injection molecular weight increases with increasing of permeability.In this paper,the formation pore is divided into strong water washing pore,the oil-water mixed pore and the non washed pore according to different oil and water existing state in formation pore.Different molecular weight polymers should be used to enhance oil recovery.There is an optimal value of the inaccessible pore volumeand it turnedin different time (the existence of oil and water in the pore is different).The optimum inaccessible pore volume will change,when water cut is 90%, the best inaccessible pore volume is 0.4,while the best inaccessible pore volume becomes 0.3 when the water cut is 30%.%通过室内实验与数值模拟方法研究了不可及孔隙体积对聚合物注入段塞效果影响.研究表明,对于不同渗透率地层,存在最优注入相对分子质量,且随着渗透率增加,最优相对分子质量逐渐增加;在将地层孔隙分为强水洗孔隙,油水混合孔隙与未水洗孔隙的前提下,针对地层孔隙内不同油水存在状态,应使用不同相对分子质量聚合物,以提高采收率;不可及孔隙体积存在最优值,不同时机转聚(孔隙内油水存在状态不同),最优不可及孔隙体积会发生变化,且转聚时间越晚,最优不可及孔隙体积越大,当含水率90%注聚时最优不可及孔隙体积为0.4,而含水率30%转聚时最优不可及孔隙体积为0.3.