非均质性对超低渗透油藏产水机制影响实验

 针对超低渗透油藏普遍发育微裂缝、导致储层非均质性强的特点，开展了裂缝型岩心的制作和不同组合方式下的超低渗透油藏天然能量开采的物理模拟实验。基质与裂缝型岩心并联水驱油实验模拟不同非均质性储层油藏产水规律。实验结果表明，非均质储层含水上升曲线分为无水采油期、含水上升期和高含水上升期、高含水期4个阶段。含水上升规律主要受储层平均渗透率、渗透率级差、微裂缝发育特征和含水层能量的影响。对于非均质性较强的超低渗透油藏，应重点关注较高渗透率储层、水层和裂缝较发育储层的含水上升变化特征。

Effect of Heterogeneity on Water Producing of Ultra-low Permeability Oil Reservoir：An Experimental Study

Ultra-low permeability reservoirs have the characteristic of generally developed micro-fractures which lead to strong heterogeneity. Fractured rock cores are made to simulate different combination modes of natural depletion of ultra-low permeability reservoir in this paper. An experimental method of making fractured cores and using them to simulate nature depletion is established. It is a new method that simulates the production performance of an inhomogeneous reservoir through the rock cores parallel water flooding experiment. The results show that the water cut rising process of the heterogeneity reservoir can be divided into four stages. They are the free water oil production stage, water cut rising stage, high water saturation rising stage, and high water cut stage. The features of the water cut curve are influenced by the average water permeability, permeability ratio and micro-fracture. The water cut rising changes of high permeability reservoir, water layer and layers with developed micro-fractures should be focused on in oil field production.