基于非结构六面体网格模型和并行计算的裂缝性油藏数值模拟研究

项目名称： 基于非结构六面体网格模型和并行计算的裂缝性油藏数值模拟研究

项目编号： No.51474179

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 杜志敏

作者单位： 西南石油大学

项目金额： 86万元

中文摘要： 裂缝性油藏模拟的技术难点是大裂缝处理和大量不同尺度裂缝的处理，目前常采用的双重介质模型由于对大裂缝的粗化模拟处理，导致计算误差较大，而基于结构性规则网格的离散裂缝模型，网格数量巨大，致使计算效率降低。本项目拟建立双重介质-离散裂缝混合数学模型，在数值模型求解上采用非结构性六面体网格，研究解决网格剖分算法；引入并行计算技术，利用高性能并行计算机集群（已具备）实施裂缝性油藏数值模拟并提高计算效率。项目技术关键是数学模型的大裂缝描述和处理、数值模型消除极小化网格的网格剖分以及并行计算技术的应用。研究成果有望为解决天然裂缝性油藏、人工压裂措施后裂缝油藏及页岩气开发数值模拟提供有效途径。

中文关键词： 裂缝性油藏；数值模拟；并行计算；非结构六面体网格；离散裂缝模型

英文摘要： How to process the fractures with various scales, including extend fractures, is one of the most challenging technologies in the fracture reservoir simulation. Currently, one method adopts the dual porous media model, which results in a relative large calculation error; another method is the discrete fracture model, which is based on the normal structural mesh system and owns low calculation efficiency. In this research, firstly a compound mathematical model of dual porous media and discrete fracture is planned to be established. Secondly, to improve the numerical simulation efficiency, unstructured hexahedron mesh will be utilized in the solution of the numerical model. Thirdly, the mesh generation algorithm will be researched and parallel computing technique will be introduced based on the high performance parallel computer cluster (which has already been equipped).The key technologies to the research are the description and processing of the extend fractures, the elimination of the minimal cells in the numerical model, the mesh generation technology and the application of parallel computing technology. This research will provide an efficient and powerful tool to solve the problems about fluid flow in the natural fracture reservoir, the hydraulic fracturing reservoir and shale gas reservoir simulation.

英文关键词： Fractured Reservoir;Reservoir numerical simulation;Parallel computing;Unstructured Hexahedral Mesh;Discrete Fracture Model(DFM)