基于离散缝洞网络模型的缝洞型油藏混合模型

发布时间：2018-05-09 04:17

本文选题：缝洞型油藏 + 离散缝洞网络模型　；参考：《中南大学学报(自然科学版)》2017年09期

【摘要】：针对存在大尺度导流裂缝的复杂缝洞型油藏,为了克服目前常用数学模型不能准确高效对其进行流动模拟的缺陷,提出一种新的混合模型。首先根据缝洞的结构特征划分合适的正交网格,在每个网格单元内建立离散缝洞网络模型(DFVN),基于超样本技术和体积平均方法求得网格单元的等效渗透率张量,对小尺度的缝洞结构进行等效处理;以形成的正交网格为基础建立嵌入式离散裂缝模型,对大尺度导流裂缝进行显示处理,并基于模拟有限差分方法建立能准确处理全张量形式渗透率的数值计算格式;最后通过单相稳定渗流数值算例验证本文方法的正确性和优越性。研究结果表明:对于缝洞结构易发生变化的油藏,只需根据变化后的缝洞结构进行局部的参数修正,避免了类似于离散缝洞网络模型的整体网格重构,有效提高了计算效率。
[Abstract]:In order to overcome the shortcomings of the current mathematical models which can not be accurately and efficiently simulated, a new hybrid model is proposed for the complex fracture-type reservoirs with large scale diversion fractures. First of all, according to the structural characteristics of the cracks and cavities, the appropriate orthogonal grids are divided, and the discrete fracture hole network model is established in each mesh cell. The equivalent permeability Zhang Liang of the mesh element is obtained based on the super-sample technique and the volume average method. On the basis of the formation of orthogonal mesh, the embedded discrete fracture model is established, and the large scale diversion crack is displayed and processed. Based on the simulated finite difference method, a numerical calculation scheme which can accurately deal with the permeability of all Zhang Liang form is established. Finally, the correctness and superiority of this method are verified by a numerical example of single-phase steady seepage flow. The results show that for reservoirs where the structure of fractures and cavities are easy to change, only the local parameters are modified according to the changed structure of fractures and cavities, and the global mesh reconstruction similar to the discrete fracture and cavity network model is avoided, and the computational efficiency is improved effectively.
【作者单位】：中国石油大学(华东)石油工程学院;中国石化油田勘探开发事业部;
【基金】：国家自然科学基金资助项目(51404292,51234007,51504277) 山东省自然科学基金资助项目(ZR2014EEQ010) 中央高校基本科研业务费专项资金资助项目(15CX05037A,14CX06091A) 中国石油大学(华东)研究生创新工程资助项目(YCXJ2016015)~~
【分类号】：P618.13

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