Study on Fluid-solid Coupling Mathematical Models and Numerical Simulation of Coal Containing Gas

3rd International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Xu, Gang^1 ; Hao, Meng^1 ; Jin, Hongwei^1

College of Safety Science and Engineering, Xi'An University of Science and Technology, Xi'an, Shaanxi

710054, China^1

关键词: Coal containing gas;    Coal permeabilities;    Critical pressures;    Effective stress;    Elastic mechanics;    Fluid-solid coupling;    Gas pressure gradient;    Residual gas pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/113/1/012138/pdf
DOI  :  10.1088/1755-1315/113/1/012138

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Based on coal seam gas migration theory under multi-physics field coupling effect, fluid-solid coupling model of coal seam gas was build using elastic mechanics, fluid mechanics in porous medium and effective stress principle. Gas seepage behavior under different original gas pressure was simulated. Results indicated that residual gas pressure, gas pressure gradient and gas low were bigger when original gas pressure was higher. Coal permeability distribution decreased exponentially when original gas pressure was lower than critical pressure. Coal permeability decreased rapidly first and then increased slowly when original pressure was higher than critical pressure.