利用岩电参数计算聚合物驱相对渗透率

常用的聚合物驱相渗曲线测试方法稳态法以及非稳态法都须精确确定聚合物黏度,而聚合物溶液具有明显的非牛顿流体特征,表现为其黏度随剪切速率变化而变化。针对现有的聚合物黏度修正模型计算结果差异较大、缺乏普适性的问题,提出一种从电阻率数据中计算聚合物驱相对渗透率的新方法,并通过相对渗透率-电阻率联测试验对该方法进行验证,与传统方法以及黏度修正法进行对比分析。结果表明,通过新方法计算得到的聚合物相相对渗透率数据较为准确、合理,可以解决传统方法计算得到的聚合物相相对渗透率值偏大的问题。

A new method for calculating relative permeability of polymer flooding based on core-electrical parameters

The precision of relative permeability data is crucial for the study of polymer flooding process. The steady-state and unsteady-state method are mostly used methods for measuring the relative permeability during polymer flooding, in which the viscosity of polymer solutions should be known. For most polymer solutions, their viscosity will vary with the shear rate or flow rate during the flooding process. Many polymer viscosity models have been proposed to correct the viscosity effect in the determination of the relative permeability, while different models can lead to different results and have limitations for field application. In this study, a new method for determining the relative permeability of polymer flooding was introduced based on the resistivity data of rocks saturated with polymer solutions. The new method was verified by the experimental data, and was compared with the traditional methods and the correction methods. The results show that the relative permeability of the polymer phase obtained by the new method is precise and reasonable, which can avoid the problem that the relative permeability might be over-estimated when using the traditional methods.