论文部分内容阅读
利用室内物理模拟实验方法,采用有效渗透率分别为250×10-3μm2、500×10-3μm2和1000×10-3μm2三管并联岩心模拟非均质油层条件,在聚合物用量相同的情况下,分别采用恒定黏度聚合物和黏度逐渐降低的两种聚合物驱油方案,对比了两种方案提高采收率的效果。同时,利用研制的平面非均质人造可视平板填砂模型,对比了恒定黏度和变黏度聚合物驱油在模型上的波及面积。实验结果表明,在三管并联和填砂模型两种情况下,变黏度聚合物驱效果均好于定黏度聚合物驱,其中三管并联方式聚驱阶段提高采收率幅度增加4.48%,填砂模型波及体积增加了7.7%。结合实验结果,利用五点法平面模型和并联油层模型,探讨了变黏度聚合物驱可以扩大油层纵向和平面上的波及体积,进而提高水驱或聚驱后采收率的原因。分析认为,无论是平面非均质、纵向层内非均质,还是在层间非均质油藏中,变黏度聚合物驱油都可实现不断扩大波及体积的目的。
Using the physical simulation experiment method, the heterogeneous reservoir conditions were simulated with three parallel cores with effective permeability of 250 × 10-3μm2, 500 × 10-3μm2 and 1000 × 10-3μm2, respectively. Under the condition of the same amount of polymer, Two kinds of polymer flooding schemes with constant viscosity polymer and gradually decreasing viscosity were compared respectively to compare the effects of two schemes to enhance oil recovery. At the same time, using the developed plane non-homogeneous artificial sand flat panel model, we compare the area of the model with constant viscosity and variable viscosity polymer flooding. The experimental results show that under both the three-pipe parallel and sand-filled model, the effect of variable viscosity polymer flooding is better than that of polymer flooding. In the three-tube parallel mode, the enhanced oil recovery increases by 4.48% The sand model increases the volume by 7.7%. Based on the experimental results, the five-point planar model and the parallel oil layer model are used to investigate the reasons why the variable viscosity polymer flooding can increase the volume and volume of the oil layer in vertical and horizontal planes and then enhance the recovery ratio after water flooding or flooding. The analysis shows that the variable-viscosity polymer flooding can achieve the goal of expanding the volume and volume continuously, both in plane heterogeneity, longitudinal inhomogeneity and in inter-strata heterogeneous reservoirs.