裂缝性碳酸盐岩酸化模拟新方法

A new simulation method for fractured carbonate acidizing

在以往裂缝性碳酸盐岩酸化模拟的研究中,一般假设裂缝与基质均匀切割且将求解域离散为规则网格的形式,处理复杂形态的裂缝时会有较大困难。为了更加真实地模拟裂缝性碳酸盐岩的酸液流动过程,采用有限元网格对其求解域进行精细网格划分,使求解域更好地逼近各种复杂的裂缝形态,并且使用有限单元法进行模拟计算,实现对线性流和径向流酸化的模拟仿真,很好地解决了网格取向问题。结果表明,将有限单元法用以酸化模拟是可行的,为多孔介质内的精细酸化模拟提供了新方法。

In the previous research on simulation of fractured carbonate acidizing, it is generally assumed that the fractures cut thematrix uniformly and that the solution domain is dispersed into regular mesh pattern, which may find it very difficult to process fractureswith complex shapes. In order to simulate the acid flow response process of fractured carbonate more realistically, this paper uses finiteelement mesh to carry out fine mesh division to its solution domain, so that the solution domain can better approach the various complexfracture shapes. In addition, finite element method is used to perform simulation, which realizes analog simulation of linear flow andradial flow acidization, favorably addressing the problem of mesh orientation. The results show that it is workable that finite elementmethod is used for acid simulation, providing a new technique for fine acid simulation inside porous media.