应力敏感条件下的数字岩心微观渗流分析方法研究

项目名称： 应力敏感条件下的数字岩心微观渗流分析方法研究

项目编号： No.51474224

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： 隋微波

作者单位： 中国石油大学（北京）

项目金额： 85万元

中文摘要： 数字岩心技术已成为研究储层微观孔隙结构、渗流特征参数和渗流机理的新手段，但目前数字岩心技术未能考虑储层应力场变化对微观孔隙结构变形和渗流场的影响，建立应力敏感条件下的数字岩心渗流分析方法是石油工程学术界极具迫切性和挑战性的难题。本项目从宏观与微观两种研究角度出发，一方面通过宏观三轴应力应变渗流耦合实验，研究宏观渗流与应力变化响应关系；另一方面将细观力学理论与数字岩心技术相结合，通过应力加载条件下的岩心数字成像研究，探索应力敏感因素以及应力数值、应力路径、应力速率等与微观孔隙变形和流场变化的内在机理，应用辛几何、极分解和同胚映射等现代数学方法描述微观孔隙变形，建立应力、孔隙压力与孔隙变形的数学模型，并将其应用于数字岩心微观渗流模拟中，通过与宏观模型进行对比分析验证，建立考虑应力敏感、孔隙变形条件下的数字岩心渗流分析方法,进一步完善数字岩心研究方法和理论，为其应用于实际油气藏开发提供科学基础。

中文关键词： 油藏工程；数字岩心；微观渗流；应力敏感

英文摘要： In recent years, digital core technology has been used for studying micro pore structure, flow characteristic parameters, and fluid flow mechanisms in reservoirs. However, current digital core technology does not take into account the influences of the in-situ stress field variation on micro pore deformation and the flow field changes. It is a quite urgent and challenging issue to establish the digital core fluid flow analysis approach under the stress-sensitive condition in petroleum academics and industry. This project is going to conduct research from the macroscopic and microscopic points of view simultaneously. On one hand, we shall couple the common core analysis and triaxial stress-strain experiments to study the response relationship between stress and flow field variations. On the other hand, we shall combine the mesomechanics theory and digital core technology to some certain points, and study the internal nature mechanisms among stress value, stress path, stress rate, micro pore deformation and flow field variation by conducting digital rock imaging experiments under stress loading condition. Some modern mathematical theory such as symplectic geometry, polar decomposition and homeomorphism mapping methods will be used for describing micro pore deformations, and establish the stress, pore pressure and deformation model for micro pores, which will be further coupled into the microscale flow simulation in digital cores. By validating the microscale model with macroscopic experiment results and analysis, we could finally establish the digital core flow simulation analysis approach considering the micro pore deformation under stress-sensitive conditions. This research project could complement the digital core technology and provide theoretical basis for applying digital core technology in practical reservoir developments.

英文关键词： reservoir engineering;digital core;microflow;stress sensitive