基于瓦斯储量法测定钻孔有效抽采半径

Determination of Drilling Effective Drainage Radius Based on Gas Reserves Method

为高效抽采某矿3号煤层瓦斯,需要依据有效抽采半径合理布置抽采钻孔。本文通过比较分析瓦斯压力降低法、示踪气体法、数值模拟法和瓦斯储量法的优缺点,确立了基于瓦斯储量法测定钻孔有效抽采半径,并采用COMSOL Multiphysics对有效抽采半径进行了模拟,结果表明:两种方法测定结果基本相同。采用瓦斯储量法测定的结果:预抽60 d,有效抽采半径为1.95 m;预抽90 d,有效抽采半径为2.37 m;预抽180 d,有效抽采半径为2.80 m.

In order to extract the gas in No. 3 coal seam , it is necessary to arrange the drilling hole reasonably according to the effective extraction radius. By comparing the advantages and disadvantages of the gas pressure reduc- tion method, the tracer gas method, the numerical simulation method and the gas reserve method, the effective extrac- tion radius of the borehole is determined based on the gas reserve method, and the effective extraction radius is calcu- lated by COMSOL Multiphysics. The results show that the two results are almost the same, the effective extraction ra- dius is 1.95 m after pre-pumping for 60 days, 2 37 m for 90 days, 2.80 m for 180 days.