层间非均质油藏物理模拟结果在流动单元划分中的应用

Physical modeling studies on development performance of interlayer heterogeneous reservoirs

研究了单层均质在实验室条件下采出程度、不同渗透率级差两层非均质和三层非均质储层在合注条件下, 各个小层的采出程度与渗透率级差的关系。研究结果表明对层间非均质储层, 合注条件下高渗透层的采出程度基本不受其他层位的干扰, 中低渗透层的采出程度取决于该层位渗透率和高渗透层之间的渗透率差异。高渗层渗透率与中低渗透层位渗透率比值3是采出程度与渗透率比值关系曲线的拐点, 渗透率比值小于3, 中低渗透层采出程度大幅度增加。该研究结果对于碎屑岩储层流动单元划分具有重要意义, 给出了流动单元划分时渗透率的界限。

In this paper,oil recovery for single homogeneous layer is studied under lab condition. The relation between the recovery and permeability differential is studied for two and three heterogeneous reservoirs under the commingled water injection.Study results show that the recovery of high permeability layer is independent of any other interbeded layers under commingled water injection; oil recovery of medium and low permeability layers depend on their permeability differential with high permeability layers. The ratio (3) of high permeability over low permeability is the inflection point,if the ratio is less than 3,oil recovery of medium-low layers will increase a lot.The result presents the permeability limit of flow unit,it is very important for the classification of flow unit in clastic reservoirs.