A Modified LBM Model for Simulating Gas Seepage in Fissured Coal Considering Klinkenberg Effects and Adsorbability-Desorbability

• Published in: Chinese physics letters 2010, Vol.27 (1), p.174-177
• Main Author: 谭云亮 滕桂荣 张泽
• Format: Article
• Language: English
• Subjects: Coal; Computer simulation; Drainage; Methane; Optimization; Position (location); Seams; Seepage; 吸附性能; 模拟优化; 煤层区; 瓦斯抽放孔; 瓦斯渗流; 裂隙渗流
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/1/014701

A modified Lattice-Boltzmann method is proposed by considering the Klinkenberg effect and adsorbability-desorbability for the purpose of simulating methane gas seepage in fissured coal. The results show that the Klinkenberg effect has a little influence on methane gas seepage in fissured coal, so it can be neglected in engineering computations for simplicity. If both the Klinkenberg effect and the adsorbability-desorbability are considered, the Klinkenberg influence on gas pressure decreases as the Darcy coefficient increases. It is found by gas drainage simulations that near a drainage hole, the effect of adsorption and desorption cannot be neglected, and the location of the drainage hole has a great influence on drainage efficient λ when the hole is just located at the mid-zone of the coal seam, λ is 0.691808; when the hole is excursion down to 1.0m from the mid-zone of coal seam, λ decreases to 0.668631; when the hole is excursion up or down to 2.0m from the mid-zone of coal seam, λ decreases to 0.632917. The simulations supply an effective approach for optimizing the gas drainage hole location.