Research On The Rule Of Gas Flow In The Coal Seam Microchannel Based On The Boltzmann Method

Coalbed methane belongs to unconventional hydrocarbon resources, is a kind of high quality clean energy. However, the frequent occurrence of coal mine accidents has Produced a serious threat to the safety of coal production, and it has become the most harmful accidents in coal enterprises. As the representatives of a double porosity medium structure, coal and rock has many complex structure and random distribution of microscopic poricidal unit. The pore fracture surface is rough, and the interior flooded with gas molecules. Coalbed methane showed thin and compressibility effects when flows in microscopic pores, the flow law does not meet Darcy’s law.This article has do a research on poricidal internal surface roughness by Scanning electron microscopy, and established the Calculation Model. And use lattice Boltzmann method to solve the gas flow problem in microscopic poricidal percolation system. Reveal the gas flow pattern in the coal and rock matrix from the point of microscopic view, provided a strong theoretical guidance and technical support to further improve coalbed methane’s production, has important academic value and practical significance.