Mechanism of enhancing oil displacement efficiency by viscoelastic polymer solution
Mechanism of enhancing oil displacement efficiency by viscoelastic polymer solution
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发表时间：
2007
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通讯作者：
Liu Chun-ze
中科院分区：
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作者：
Liu Chun-ze
为了研究粘弹性聚合物溶液对多孔介质剩余油的作用机理，描述了以聚合物溶液第一正应力为表征的聚合物溶液在储层条件下的流变性能。采用油藏工程方法分析了粘弹性聚合物溶液在波动管模型中的流动和驱油机理。从力学角度分析了聚合物溶液提高驱油效率的机理。结果表明，粘弹性聚合物溶液对油膜的第一法向应力和剪切应力的拖拽力大于牛顿流体；粘弹性越强，第一法向应力和油膜上的拖拽力越大，提高采收率越高。孔隙介质越不规则，第一正应力越大，粘弹性越强。
In order to research the action mechanism of viscoelastic polymer solution on residual oil in porous medium,the rheological properties of polymer solution characterized by first normal stress of polymer solution under reservoir conditions were described.The flowing and oil displacement mechanism of viscoelastic polymer solution in undulating tube model conducted by upper-convected Maxwell model were analyzed by reservoir engineering method.The mechanism of enhanced oil displacement efficiency of polymer solution was presented from mechanics angle.The results show that the dragging force on oil film of first normal stress and shear stress from viscoelastic polymer solution is larger than that of Newtonian fluid.The stronger the viscoelastisity is,the larger the first normal stress and the dragging force on oil film are,and the higher the enhanced oil recovery is.The more irregular the pore media is,the larger the first normal stress is and the stronger the viscoelastisity is.