多孔介质剪切作用对聚合物溶液有效黏度的影响

The Influence of Shearing of Porous Media on the Polymer Solution's Effective Viscosity

聚合物溶液在驱油过程中的黏性损失直接影响其波及效果,模拟研究聚合物溶液在岩心中黏度损失具有重要意义。使用特定聚合物HPAM溶液在不同尺度岩心中渗流达到稳定,采用面积积分法,建立剪切作用对黏度损失贡献率的变化规律曲线。结果表明,HPAM溶液在近井地带高速流动时,剪切作用在黏度损失中的贡献率可达到100%,而对聚合物溶液渗流前缘影响较小,前缘黏度损失主要受滞留和水稀释作用的影响。质量浓度为1.5 gL的HPAM溶液与1.8 gL的相比,剪切作用易达到稳定,对黏度损失贡献率较小。

In the process of flooding,the loss of polymer solution＇ s effective viscosity had a direct impact on the sweep efficiency,so it＇s of great importance to study the viscosity loss of polymer flooding in cores. HPAM solution was used to flow through the cores of different length to achieve stability. The relationship between viscosity loss and shearing rate was established with integral method. The results showed that when HPAM solution flowed with a high shearing rate near the wellbore,the contribution of shearing to viscosity loss could reach 1. 0,while having little effect on the front of polymer solution. The viscosity of front was affected mainly by retention and water dilution.Compared with the concentration of 1. 8 gL HPAM solution,the shearing to the concentration of 1. 5 gL HPAM solution was more likely to achieve stability,and the contribution to viscosity loss was smaller.