论文部分内容阅读
裂隙储层具有强烈的非均质性及储层渗透性预测难度大的特点,利用逾渗理论来研究裂隙储层深层复杂介质渗透性,是当前研究的热点问题.基于连续逾渗,将裂隙网络模型合理简化.使用排除体积对裂隙密度进行无量纲化,从而使裂隙的渗透性与裂隙的形状无关.首先使用Monte Carlo方法得到裂隙在不同密度时的网络图,而后使用ComsolMultiphysics中的有限元求解器得到流体在裂隙中的速度和压力分布图,数值模拟表明:随着裂隙密度的增加,裂隙的连通性增加,进而流体在裂隙中的渗透性也增加;最后使用有限尺度转换定律和尺度放大思想,通过重复子区域的方法求解每个小区域的渗透性,得到裂隙储层在不同尺度下的渗透性,分析得到储层平均渗透性和无量纲化裂隙密度之间的关系.模拟得到的渗透率值和FRACA软件得到渗透率泊松相关系数为0.885.该规则的发现为逾渗理论从小尺度放大到宏观物理模型即储层尺度提供了一个理论依据.
Fracture reservoirs are characterized by strong heterogeneity and difficulty in predicting reservoir permeability, and the percolation theory of deep percolation in fractured reservoirs is a hot issue in current research.Based on the continuous percolation, The network model is reasonably simplified.Using the exclusion volume, the crack density is dimensionless, so that the permeability of the fracture has nothing to do with the shape of the fracture.Firstly, the Monte Carlo method is used to get the network diagram of fractures at different densities, and then the finite element method of Comsol Multiphysics The solver obtains the velocity and pressure distribution of the fluid in the fracture. The numerical simulation shows that as the fracture density increases, the connectivity of the fracture increases, and the permeability of fluid in the fracture also increases. Finally, the finite scale transformation law and scale The idea is enlarged, the permeability of each small area is solved by repeating the sub-area method, the permeability of fractured reservoirs at different scales is obtained, and the relationship between average permeability of reservoir and non-dimensional fractured density is obtained. Permeability and FRACA software Poisson’s correlation coefficient was 0.885. The rule was found to be percolation theory from Zoom scale to the macroscopic scale physical model of the reservoir that is to provide a theoretical basis.