采动区地面井煤层气产能影响数值模拟研究  

Numerical Simulation Study on Coalbed Methane Productivity Influence of Surface Wells in Mining-stabilized Area

作　　者：唐建平 李日富[1,2] TANG Jianping;LI Rifu

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《中国矿山工程》2023年第2期46-52,共7页China Mine Engineering

基　　金：山西省科技重大专项(20201102001)。

摘　　要：在建立了采动区瓦斯流动模型方程的基础上,以新疆1930煤矿24312工作面为工程背景,在煤层采动期间对抽采井不同井位、钻井直径、钻井深度的瓦斯抽采效果进行了模拟。计算结果表明:不同工况条件下的抽采井内流速、浓度明显不同,以360 d为抽采期限,当地面井距离回风巷侧壁30 m左右、终孔位于煤层中部、钻井直径210 mm的工况,在该条件下取得了最大的瓦斯抽采量。并以此数值模拟结果来指导运用24312工作面地面井施工,地面井经过180 d运行,回风巷瓦斯降至先前浓度的60%,上隅角瓦斯浓度降至52%。两侧瓦斯浓度下降明显,消除了工作面瓦斯超限的威胁。该模拟结果可为类似采动区地面井的布置提供参考。On the basis of establishing the model equation of gas flow in mining area,taking 24312 working face of Xinjiang 1930 Coal mine as the engineering background,the gas extraction effect of three parameters of different well location,drilling diameter and drilling depth during coal mining was simulated.The calculation results show that the flow rate and concentration in the extraction well are obviously different under different working conditions.The maximum gas extraction amount can be achieved under the condition that the extraction period is 360 d,the local well is about 30 m away from the side wall of the return air roadway,the end hole is located in the middle of the coal seam,and the drilling diameter is 210 mm.The numerical simulation results were used to guide the ground well construction of 24312 working face.After 180 days of operation,the gas concentration in the return air roadway decreased to 60%of the previous concentration,and the gas concentration in the upper corner decreased to 52%.The gas concentration on both sides decreased significantly,eliminating the threat of gas overrun on the working face.The simulation results can provide reference for the layout of surface Wells in similar mining areas.

关 键 词：采动区 瓦斯流动 地面井 模拟 瓦斯抽采量 

分 类 号：TD722[矿业工程—矿井通风与安全]