油藏流动条件下聚合物溶液老化规律及应用

Polymer aging regulation and its application under reservoir seepage

为研究聚合物溶液运移过程中老化作用对油田采收率的影响,设计了聚合物溶液的动态老化实验,通过不同体积比的聚合物溶液混合过程模拟新老聚合物溶液混合下的动态老化过程。实验结果表明,混合后聚合物溶液的粘度约等于混合前各自溶液粘度以质量为权值的加权和,与实测粘度的最大差值不超过1.0mPa·s;聚合物溶液的混合老化过程与以往的静态老化过程类似,因此传统的静态老化过程可以用于近似聚合物溶液运移过程中的动态老化过程。通过数据分析,提出了混合后聚合物溶液粘度的估算方法。在此基础上,提出了相应的数值模拟思路。计算结果表明,聚合物溶液的老化作用对油田采收率影响较大,在数值模拟中需要考虑老化作用对油田采收率的影响。在油田的实际开发过程中,需要对聚合物溶液的热稳定性进行定量评估。

In order to study the influence of polymer aging effect on oil recover during the transportation, the dynamic aging experiments of polymer are designed herein, and the results indicate that the mixture aging process is very similar to static aging process as usual, so, the traditional static aging process can be used to simulate the mixture aging process. By data analysis, the viscosity estimation of polymer after mixing has been proposed. The maximum difference is under 1 mPa·s comparing with actual measurement. On the basis of that, the corresponding algorithm of numerical simulation has been given. The Calculation results indicate that, the aging effect of polymer solution has great influence on oil recovery. Therefore, the effect is needed to be considered in numerical simulation, and thermal stability is needed to be estimated in reservoir development