极复杂断块油藏交替采油提高采收率的可视化物理模拟

极复杂断块油藏的断层、储层非均质性和边水存在等因素均会影响其最终的采收率。为了弄清各因素之间的影响作用,利用可视化动态仿真驱替装置进行水驱油的物理模拟实验,透过可视化的实验图像可以直观地观察到剩余油的分布规律及流线变化特征。为此共设计了6组不同的实验方案,研究油藏储层非均质性以及边水存在时对水驱油效果的影响。结果表明：模型在一注两采稳定注水开发时会形成井间滞留区,这部分“死油区”可通过交替采油的方式重新动用;同时对三种非均质情况下的渗透率级差组合进行了评价;当存在边水时,流线分布较之前有很大的差异,对比不同的实验方案发现均质边水模型的采出程度更大。通过物理模拟地下流体的流动特征,为极复杂断块油藏剩余油的有效开发提供基础。

Visual Physical Simulation on Enhanced Oil Recovery by Alternating Oil Production in Extremely Complex Fault Block Reservoirs

In extremely complex fault block reservoirs, the parameters such as the fault, reservoir heterogeneity and the existence of side water can influence the final recovery of oil field. In order to explore the effect between various factors, we used the visualized dynamic simulation displacement device to carry out the physical simulation experiment of displacement. The remaining oil distribution and streamline variation can be observed directly through the visualized experimental images. In this paper, six different experimental schemes have been designed to study the effect of reservoir heterogeneity and the existence of edge water on displacement. The results show that the inter-well retention area which called "dead oil area" will be formed during the development of stable water injection in the one injection-two production pattern, and it can be reactivated in regulation of alternative oil production. At the same time, the permeability ratio combinations of three different heterogeneous conditions were evaluated; The distribution of streamlines is quite different from before when the edge water exists in the model. Compared with different experimental schemes, the recovery of the homogeneous model with edge water is greater. The flow characteristics of underground fluid are physically simulated, which provides a basis for the effective development of the remaining oil in the extremely complex fault block reservoirs.