聚合物微球调驱机理研究

Study on Profile-control Flooding Mechanism of Polymer Microsphere

通过室内渗滤评价实验和核磁共振实验,研究了多孔介质不同渗透率条件下聚合物微球调剖效果规律,分析了规律产生的原因。结果表明,多孔介质平均渗透率适当时,聚合物微球可以达到最佳调驱效果,超出这一范围效果将变差。通过岩心驱替核磁共振分析实验进一步揭示其作用机理,即聚合物微球粒径应与孔喉尺寸匹配。聚合物微球粒径过大或过小,都不能达到最佳调驱效果:粒径过大,可注入性变差;粒径过小,则不能有效封堵优势通道。

The regular pattern of profile-control flooding effect of polymer microsphere at different permeability conditions was investigated by percolation experiment and nuclear magnetic resonance( NMR) experiment. And the reasons that the regular pattern happened were also analyzed. The results showed that the best profile-control flooding effect of polymer microsphere could be obtained if the average permeability of porous medium is appropriate scope,otherwise,the effect could be worse if the average permeability is beyond the scope. The mechanism was further reveal by core-flooding experiment and NMR experiment,which means the particle size of polymer microsphere should match the pore size of porous medium. The best profile-control flooding effect could not reach if the particle size of polymer microsphere is too large or too small: the former is difficult to be injected into reservoir,the latter could not effectively plug large pores formed by water flooding in reservoir.