低渗透性煤层群卸压开采地面钻井抽采瓦斯技术  

Surface well drilling extracting gas technology in low permeability coal seams depressurized mining

作　　者：涂敏[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001

出　　处：《采矿与安全工程学报》2013年第5期766-772,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51074004);安徽省自然科学基金项目(11040606M102)

摘　　要：基于淮南矿区高瓦斯低渗透性煤层群赋存条件,通过试验模型分析了卸压开采后的覆岩移动破坏、卸压煤层移动变形、采动裂隙垂向分带和卸压煤层应力分带特征,得出了首采层采空侧顶板至上覆卸压煤层顶板中存在环形裂隙区、竖向裂隙区、远程卸压煤层裂隙区,根据采动裂隙区发育特征,提出了卸压瓦斯抽采地面钻井的部署方法。在顾桥矿1117(1)工作面切眼外侧、风巷内侧和工作面前方分别布置有""、"│"型和"L"型地面钻井,实现了长时间、大范围、较高的卸压瓦斯抽采率。总结了地面钻井位置、钻井型式、钻井稳定性与卸压瓦斯抽采效果之间的关系。Based on depositing conditions of high gas and low permeability of coal seam group in Huainan mining area, this article analyzes the movement and failure characteristics of overlying strata, the movement and deformation characteristics of relief seam, the vertical zoning characteristics of mining fractures and stress zoning characteristics of relief seam through the analogue test. Conclusion is drawn that there are annular fracture area, vertical fracture area, and the remote relief seam fracture area from the roof of goaf in the first mining layer. According to the developing characteristics of the mining fracture areas, this article puts forward the deployment method of surface drilling in the drainage of pressure relief gas. The ＂~＂-type, ＂｜＂-type and ＂L＂-type ground drilling are respectively put outside the starting cutting hole 1117（1） work face, inside the wind tunnel, and in front of the work face in Guqiao Coalmine. The relationship among the ground drilling locations, drilling type, drilling stability and relief gas drainage effect is probed into and found.

关 键 词：低渗透性 煤层群 采动裂隙垂向分带 卸压瓦斯抽采 地面钻井部署 

分 类 号：TD325[矿业工程—矿井建设]