基于COMOSOL的顺层钻孔有效抽采半径的数值模拟

Numerical Simulation on Effective Drainage Radius of Drill Hole Along Coal Seam Based on COMSOL

为了能够准确地确定顺层瓦斯抽采钻孔的有效抽采半径,以煤层瓦斯赋存及瓦斯流动理论为基础,根据达西定律和质量守恒定律,以钻孔周围煤体瓦斯流动场为研究对象,建立了顺层瓦斯抽采钻孔的瓦斯流动方程,并以沁新煤矿为例,利用COMOSOL软件对抽采钻孔在不同的抽采负压和抽采时间下的瓦斯流动方程进行了数值模拟,确定出了合理的抽采负压、抽采时间及有效抽采半径。

In order to accurately determine the effective drainage radius of drill hole along coal seam, according to the Darcy~ law and the law of conservation of mass as well as the theory of gas flow and occurrence, the gas flow equation of gas extraction drill hole along coal seam was established to study the flow field of coal seam gas around the drilling. Taking Qinxin mine as an example, the gas flow equation was simulated under different drainage negative - pressure and drainage time by using COMSOL software, and the reasonable drainage negative -pressure, drainage time and the effective drainage radius were determined.