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为了研究聚合物溶液在多孔介质中流动时衰竭层厚度的变化规律 ,分别采用流变仪和岩心渗流实验测定了聚合物溶液流变性 ,并用双流体模型和线性衰竭层模型计算了衰竭层厚度 .结果表明 :衰竭层厚度与聚合物分子的回旋半径级别相当 ;在聚合物溶液质量分数较低时 ,用双流体模型计算的衰竭层厚度高于线性模型计算的结果 ,但在聚合物质量分数高于缠结质量分数时 ,线性模型计算的厚度较大 ,并且衰竭层厚度随聚合物质量分数升高而减少 ,下降的指数约为 1.1～ 1.3 ;在聚合物溶液的质量分数为 1.5× 10 - 4时 ,衰竭层厚度下降为 0 .1μm左右 ,但表观粘度仍因衰竭层的存在下降了 3 3 .5 %
In order to study the variation law of the thickness of depleted layer when the polymer solution flowed in porous media, the rheology of the polymer solution was measured by rheometer and core seepage experiment respectively. The thickness of the depleted layer was calculated by two-fluid model and linear failure model. The results show that the thickness of depleted layer is equivalent to the radius of gyration of polymer molecules. When the mass fraction of polymer solution is low, the thickness of depleted layer calculated by two-fluid model is higher than that calculated by linear model. However, when the polymer mass fraction is high When the mass fraction is entangled, the thickness calculated by the linear model is larger, and the thickness of the depleted layer decreases with the increase of the polymer mass fraction, the decreasing index is about 1.1 ~ 1.3. When the mass fraction of the polymer solution is 1.5 × 10 - 4, the thickness of the depleted layer decreased to about 0.1μm, but the apparent viscosity was still decreased by the presence of the failed layer by 33.5%