顺煤层顶板长钻孔压裂增透技术应用

Application of Long Borehole along Roof Fracturing

通过对新元煤矿矿井地质条件、煤层、瓦斯赋存条件的分析,采用千米定向钻机沿煤层顶板施工岩石顺层水力压裂长钻孔,将煤层顶部和压裂钻孔的距离控制在0.8m至1.2m之间,还增强了压裂效果,并预防软煤顺层因钻孔导致坍塌,进一步达成位于顶板顺层水力抽采的效率提升和工作稳定。在新元煤矿31009工作面回风巷3号突出煤层增透工程中进行了现场应用,实现了单孔抽采的纯量始终不低于每天700m^3,有效实现质地松软煤层区的通透性和抽采,具有广泛推广应用前景,为类似工程提供了参考依据和经验指导。

By analyzing the geological conditions of the mine, coal seam gas conditions, one thousand meters directional drilling is used to constructing long hydraulic fracturing drilling along seam, which can control the distance of roof and fracturing hole between 0.8 m to 1.2 m,enhances the fracturing effect, prevents soft bedding coal collapsing, and achieves the aim of improvement and stability for drainage. The field application is carried out in the No.3 outburst coal seam enhancement project in the 31009 working face of the Xinyuan Coal Mine, it is realized that the amount of pure single-hole drainage is no less than 700 m^3 per day, which enhances the permeability and drainage effect of soft coal seam zone. According to which, it has broad application prospects,and provides a reference guide for similar projects.