基于数值模拟的玉溪煤矿地面预抽瓦斯治理效果预测

Prediction of gas control effect of ground pre-pumping well in Yuxi Coal Mine based on numerical simulation

基于对玉溪煤矿地质特征研究的基础上,选择垂直井和水平井2种方式,在工作面上规模化部署地面预抽井,并采用数值模拟方法分别预测了预抽直井和预抽水平井的产气效果和瓦斯含量变化。研究表明:预抽直井和预抽水平井降低瓦斯含量的效率基本相同,但预抽水平井的产气量远高于预抽直井;预抽直井可用于煤炭准备区,预抽水平井可用于煤炭规划区。瓦斯地面预抽不仅生产收入可观,还能节省井下瓦斯抽放成本,经济效益和安全效益显著。

Based on the research of the geological characteristics of Yuxi Coal Mine,choosing two ways of vertical and horizontal wells,surface pre-extraction well is large scale deployed in mining face,and the well production and the gas content change of vertical and horizontal well were predicted using numerical simulation.The result showed that:the efficiency of gas content reduction of vertical and horizontal pre-extraction well is similar,but the production of horizontal well is far higher than vertical well;vertical pre-pumping well can be used in preparation area,horizontal pre-pumping well can be used in planning area.Gas surface pre-extraction not only has considerable income,but also saves the cost of underground gas drainage,and the economic and safety benefits are remarkable.