剩余油的数量、分布情况受油层沉积韵律类型、重力作用、毛管力作用、油层渗透率、水驱强度等多种因素的制约。
The quantity and distribution of remaining oil are dominated by the type of deposit rhythm, gravity and capillarity force, permeability and water flooding degree.
周期注水技术主要是通过油水交渗效应、毛管压力作用，增加注水波及体积，从而提高水驱采收率的技术。
The result shows that cyclic water injection may be more effective if increasing oil-water percolation rate, standup pressure time and water holdup coefficient.
一般认为，聚丙烯酰胺起到调解注入水的流变性、增加驱动液粘度、改善水驱波及效率等作用。
Generally speaking, HPAM can adjust the injected water's rheology properties and improve the viscosity of driven solution, make better the efficiency of spread etc.
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