聚合物驱对储层及其自身性质影响实验研究

The Experimental study on the affection on property of reservoir and polymer by polymer flooding

目前聚合物驱油技术已成为各大油田提高采收率的主要手段。聚合物溶液在多孔介质中流动过程中,由于其吸附、滞留特性对油层的渗透率、孔隙结构、油水流动特性有一定的影响,聚合物溶液的粘度也会发生变化。通过实验研究,聚合物驱后储层渗透率降低,储层粒度越小渗透率下降程度越大,孔隙度没有明显的变化,聚合物的吸附降低了水溶液和油溶液的渗透率。在高渗的储层中,聚合物吸附对油溶液流动几乎没有影响。储层粒度越小,渗透率越小,聚合物粘度降低的程度越大。

At the moment, polymer flooding becomes the main measure to enhance the oil recovery. When the polymer solution flows in the porons medium, the permeability, the pore structure and the flow behavior of oil and water are affected by the adherence and detention, at the same time the viscosity of polymer solution will change. Through the experimental study, the permeability of reservoir decrease after the polymer flooding; the grain grade is less, the permeability plugging is bigger; the porosity didn＇t change apparently; the permeability of aqueous solution and oil decrease because of the adherence of polymer. In the high permeability reservoir, the polymer adherence nearly has no effect on the oil flowing; the grain grade of reservoir is less; the permeability is less, the viscosity of polymer decrease greater.