稠油热采中THM耦合机制及储层破裂演化研究

项目名称： 稠油热采中THM耦合机制及储层破裂演化研究

项目编号： No.51304230

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 孙峰

作者单位： 中国石油大学（华东）

项目金额： 25万元

中文摘要： 稠油热采高温蒸汽注入过程中的温度-渗流-应力(THM)耦合机制及与储层破裂之间的相互影响是当前热采开发领域中亟待解决的重要基础性课题。本研究旨在综合考虑温度场、渗流场、应力场及储层破裂相互关系的力学框架体系内，通过高温高压岩石力学试验分析岩样的强度损伤本构关系，声发射试验测试破裂事件随温度、压力载荷变化的时序特征；应用损伤力学和THM多场耦合理论，建立温度-渗流-应力-破裂相互耦合作用的系统控制方程；研究耦合模型的有限元数值求解方法，重点解决温度、压力Eulerian坐标与储层变形Lagrangian坐标的统一描述，复杂形状/边界/各向异性油藏热采模拟等问题；研究掌握随蒸汽腔扩展，温度、压力、应力变化与储层破裂之间的动力学响应机制，为稠油热采开发方案优化及热采诱发地质灾害评价预防等研究提供理论基础及技术支持。

中文关键词： 稠油热采；温度-渗流-应力耦合；储层破裂；试验研究；数值模拟

英文摘要： Thermal production is an important heavy oil recovery method , which bothers with the complex problems of Thermo-Hydro-Mechanical(THM) coupling effects and reservoir failure processes due to steam injection. In this research, the rock triaxial test is designed to research the rock strength reduction characteristics under high temperature and pressure, and the acoustic emissions experiment is used to analysis the thermal cracking responds of the rock failure. Based on the damage mechanics and the coupling theory of T-H-M, the fully coupling equations of heat transfer, fluid seepage, geomechanics, and reservoir damage are constructed. Finite element method is used to solve the coupling equations, and the coordination problems of grid and coupling parameters between Eulerian and Lagrangian space coordinates. Upscaling thermal recovery simulation methods of heterogenous reservoirs are also researched. Considering the influence of rock strength failure and reservoir fracturing,the dynamic coupling responses of steam chamber evolution and T-H-M dynamic behaviors in space-time are quantitatively analyzed. This research is of great significance for steam injection parameters optimization,and geologic hazard evalution induced by thermal production.

英文关键词： heavy oil thermal recovery；thermo-hydro-mechanical(THM) coupling；reservoir failure process；experimental research；numerical simulation