摘要
聚合物配注系统中过滤器和管线内壁存在黏性胶状物，它是注入水中微生物在系统内大量繁殖的产物，它不仅会对井筒附近区域储层孔隙造成堵塞，与聚合物溶液接触后还会引起聚合物溶液性质变化，甚至会影响聚合物驱开发效果。采集杏树岗油田聚合物配注系统内滋生胶状物，经剪切后与聚合物溶液混合，形成含胶状物聚合物溶液。利用物理模拟方法，开展了胶状物对聚合物溶液性能以及聚合物驱开发效果影响实验研究。结果表明，“胶状物”加入聚合物溶液后，导致聚合物分子聚集态网络结构出现缺陷、部分分子链发生断裂，进而引起聚合物溶液黏度降低、黏弹性变差。与“高分”聚合物溶液相比较，含“胶状物”聚合物溶液在多孔介质内渗流阻力较大，传输运移能力较差。随胶状物注入量增加，聚合物驱采收率增幅呈“先增后减”变化趋势。由此可见，胶状物存在对聚合物驱开发效果存在影响，少量胶状物进入油藏有利于改善聚合物驱开发效果。随油藏非均质性加剧、平均渗透率增加，胶状物对聚驱开发效果影响程度降低。
Abstract
The viscous jelly ,which exist in the filter and pipe wall of polymer injection allocation system, is the product of microbial populations of the Injection water in the system. It will not only clog up the near wellbore area reservoir pore ,but also change polymer solution properties after contacting with the polymer solution,even will affect the development effect of polymer flooding. The Xingshugang oil field polymer injection allocation system spawned jelly was collected, sheared and combined with polymer solution. The research on jelly’s impact on properties of the polymer solution and polymer flooding development effect was carried out by physical simulation method. The results showed that, after being added to the polymer solution ,the jelly resulted in the defect of the reticular polymer molecule aggregation and the part of the molecular chain breaking, thereby caused the decrease of polymer solution viscosity and poor viscoelasticity. Compared with the high molecular weight polymer solution, the flow resistance of the polymer solution with jelly was large and transmission and migration ability was poor in the porous medium. With the injection volume of the jelly increasing, the polymer flooding recovery first inceased then decreased. Therefore, the jelly had an influence on polymer flooding development effect, and a small amount of jelly would help to improve polymer flooding effect. With heterogeneity of the reservoir and the average penetration rate increaseing, the influence of jelly on polymer flooding development effect dereased.
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