支化预交联凝胶颗粒驱油机理可视化实验研究

Visualization experimental study on oil-displacement mechanism of B-PPG system

通过可视化非均质模型驱油实验,对比研究了黏弹性支化预交联凝胶颗粒(B-PPG)和聚合物2种体系的流动规律和驱油效果,分析了B-PPG的质量浓度和注入速度对体系驱油效果的影响。结果表明:与聚合物相比,B-PPG具有更大的波及系数和更好的驱油效果;B-PPG既能通过提高溶液黏度进行流度控制,其中的黏弹性颗粒又能在孔隙中以流动—堵塞—变形通过的运移方式使液流不断转向,动态改善了模型的非均质性,提高了波及面积;B-PPG体系的质量浓度越大,流速越低,驱油效果越好。

Through the visualization experiment of oil displacement by heterogeneous model, this paper compared the flow pattern and oil-displacement effect of B-PPG （branched-preformed particle gel） and polymer, analyzed the influence of mass concentration and injection rate on the oil-displacement effect of B-PPG system. Results show that compared with the polymer, B-PPG has high sweep efficiency and good oil-displacement effect. B-PPG can control the mobility through improving solution viscosity and the viscoelastic particles can make the liquid flow constantly divert in the pore through the migration mode of flowing-plugging- deforming, dynamically improving the heterogeneity of model and enlarging the sweep area. In addition, the higher the mass concentration of B-PPG system is and the lower the flow velocity is, the better the oil-displacement effect is.