陆相沉积多层非均质油藏聚合物驱层系组合界限研究

原油黏度高及储层非均质性强是影响海上油田聚合物驱开发效果的重要因素。本文采用双管并联物理模拟实验,研究了多层非均质油藏在不同注聚时机、不同注聚速度下,聚合物溶液在不同渗透率级差岩心中的分配比例,分析了岩心渗透率级差对高、低渗透层和总的采收率的影响。实验结果表明,多层聚合物驱的合理渗透率级差在5~6范围内,聚合物驱改善储层纵向非均质性较理想,能获得较高的采收率。研究结论为确定多层非均质油藏的聚合物驱合理层系组合界限提供了实验和应用依据。图9表3参8

The Study on Strata Combination Limit of Polymer Flooding In Multi-Layer Continental Deposit Heavy Oil Reservoir

The high oil viscosity and heterogeneity of multi-layer reservoir are the key factors influencing the development effects of polymer flooding in offshore heavy oilfield. In this paper, parallel twin-tube physical simulation was used to study the volume ratio entering different permeability tubes on the condition of different polymer injection timing and different polymer injection speed in the multilayer heterogeneous reservoir. Then the effect of permeability differential on the recovery factor of the high and low permeability layers and the total recovery factor was analyzed. Experimental results showed that the reasonable permeability ratio of polymer flooding in multi-layer reservoir was in the range of 5-6. On this condition, polymer flooding could improve reservoir vertical heterogeneity and obtain a higher oil recovery. The conclusion of the study will provide experimental and applied basis for determining reasonable strata combination limit in multi-layer heterogeneity reservoir.