煤层气储层流固耦合数学模型  

Mathematical Model of Fluid-Solid Coupling Seepage in CBM Production

作　　者：邓广弘[1] 罗克勇[1] 马东民[2] 雷学武[1] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]西安科技大学地质与环境学院,陕西西安710054

出　　处：《天然气地球科学》2011年第4期723-727,共5页Natural Gas Geoscience

基　　金：国家科技重大专项"深部煤层气开采运移规律及数值模拟研究"(编号:2008ZX050)资助

摘　　要：基于多孔介质及Terzaghi有效应力原理,建立煤层气开采中煤岩骨架本构模型,分析煤岩骨架的应力形变;同时,建立了孔隙度与渗透率的动态模型,分析煤层气排采过程中煤层物性的变化;依据流体力学连续性方程,建立煤层流体的渗流场方程。结合模型的辅助方程及定解条件,给出了单相(多相)煤岩流固耦合渗流的数学模型。Based on porous media and Terzaghi effective stress principle, we build the model of coal constitutive framework in the coal bed methane （CBM） production and interpret the stress deformation of coal matrix. We setup the dynamic model of the porosity and permeability so as to get the changes of the physical properties of coal seams during CBM production. The seeping equation of coal fluid is obtained based on hydromechanics continuity equation. Finally we present the mathematical model of single phase and muhiphase fluicl solid coupling seepage in the CBM production by means of auxiliary equation and formed conditions.

关 键 词：煤层气 流固耦合 有效应力原理 应力场 渗流场 

分 类 号：TE312[石油与天然气工程—油气田开发工程]