井筒揭煤区域的地面瓦斯抽采防突技术研究

Study on gas outburst prevention technology with surface gas drainage for seam opening area in mine shaft

为保障新建突出矿井揭煤安全,提高地面瓦斯抽采井的抽采消突效果,对官寨煤矿瓦斯抽采井井型选择、瓦斯抽采工艺和技术、抽采效果预测等方面开展研究。结果表明:在地质构造复杂地区进行地面瓦斯抽采时,由于断层发育、煤层赋存不稳定,不宜施工水平井,采用垂直井和定向井更具有针对性和适用性;对具有突出危险性的煤层20 m范围进行射孔,并采用"泵送桥塞分段压裂"进行水力压裂改造,压裂完成后,对改造煤层进行合层抽采,抽采效果较好。工程实践表明,采用地面瓦斯抽采井进行瓦斯抽采能有效降低煤与瓦斯突出危险性,保障井筒安全施工。

In order to ensure a safety seam opening in a new mine with the coal outburst and to improve the gas drainage and outburst elim- ination effect of the surface gas drainage well, a study was conducted on the selection of the gas drainage well, the gas drainage technique and technology, the gas drainage effect prediction and other aspects in Guanzhai Mine. The results showed that when the surface gas drain- age was conducted in the complicated geological structure area, due to the fault development and the unstable seam deposition, a horizontal gas drainage well was not suitably constructed and a vertical well and directional well would be pertinence and suitability. A perforation should be conducted within 20 m of the seam with outburst danger. A pumping bridge plug sectional fracturing was applied to the hydraulic fracturing reconstruction. When the fracturing completed, seam combined drainage was applied to the reconstructed seam and the drainage effect was excellent. The engineering practices showed that the surface gas drainage well applied to the mine gas drainage could effectively reduce the danger of the coal and gas outburst and could ensure the safety construction in the mine shaft.