应力作用下煤层气非稳定耦合渗流模型及数值模拟

The Seepage Model and Numerical Simulation of Coalbed Gas Unsteady Coupled under Stress

基于多孔介质渗流力学和流固耦合理论,建立了应力作用下煤储层中煤层气流固耦合数学模型,并根据数学模型的非线性特性,采用多重物理量耦合软件COMSOL Multiphysic进行数值模拟分析,通过模拟结果研究了煤岩体中压力和浓度的分布特性,并且研究了耦合与非耦合情况下压力动态曲线,为模拟煤层气产量预测和预防矿井瓦斯突出提供了理论依据。

The numerical simulation of coalbed gas fluid and solid coupling in coal container rock is set under stress, on the basis of fluid mechanics in porous medium and the theory of fluid and solid coupling. According to the non-linearity characteristic of the numerical simulation, the COMSOL Muhiphysic-the multi-physics coupling software, is used to analyze the numerical simulation. The distributing characteristic of the pressure and density in coal rock mass is also studied, as well as the dynamic curve of pressure under the condition of coupling and non-coupling. It gives the academic basis for simulating the prediction of coalbed gas＂ production and preventing the mine gas extrusion.