注聚合物井井下温度分布的若干影响因素分析

Analysis on Influence Factors of Temperature Distribution in Polymer Injection Well

温度对聚合物的粘度和稳定性有很大影响。注聚合物井的井下温度分布影响因素分析对改善注聚合物方案和研究注聚合物驱油效果具有重要意义。假定聚合物溶液为非牛顿幂律流体,在柱坐标系中构建了包含井筒、注入层和围岩等3部分介质的二维温度场模型,将模型离散化生成有限差分方程并求解。在对经不同注入时间和停注时间后的二维温度分布模拟计算的基础上,分析了注入聚合物溶液的密度、导热系数、比热容、井筒半径等因素对井下温度分布的影响。分析表明,这些因素对井下温度分布均有不同程度的影响,应注意综合考虑。

Since viscosity and stability of polymer are greatly affected by temperature, it is important to analyze influence factors of temperature distribution in polymer injection wells for improving polymer injection scheme and studying oil displacement effect. Having supposed that polymer solution is a non-Newtonian power-law fluid, a model of 20 temperature field is constructed in a cylinderical coordinates including 3 media of borehole, injection layer and shoulder beds, then the finite difference equation formed by discretization of the model is solved. Based on the simulated calculation of 2D temperature distribution at different times after injection-started and injection-shutdown, analyzed are factors affecting downhole temperature distribution, such as density, thermal conductivity, specific heat of the polymer solution and wellbore radius. The analysis shows that these influence factors affect the downhole temperature distribution with their own degrees, and they should be considered comprehensively.