摘要
为了解决抽放钻孔施工过程中垮孔及瓦斯预抽困难的问题,以石壕煤矿为工程背景,采用现场实测、数值模拟、现场应用等手段,对水力压裂技术进行扩展应用,对于揭煤局部范围采取井组压裂技术,对于瓦斯重灾区采取拦截降压压裂技术。通过数值模拟不同水压下钻孔渗透率变化,确定井组压裂与拦截降压压裂施工参数,进行工程应用。研究结果表明,通过实施井组压裂技术,煤层渗透性增加,在抽采负压相同的情况下,单孔瓦斯浓度均较高,与未实施井组压裂的地点相比,压裂钻孔单孔初抽浓度高、瓦斯量多。通过实施拦截降压压裂技术,使压裂区域的瓦斯压力得到释放,垮孔现象降低,解决了喷孔造成瓦斯高浓度超限问题,该研究为深部矿井开采瓦斯防治提供了新途径。
In order to solve the problems of caving holes and difficult gas pre-extraction in the process of extraction drilling,taking Shihao Coal Mine as the engineering background,the hydraulic fracturing technology is extended and applied by means of field measurement,numerical simulation and field effect analysis.The well group fracturing technology can be adopted for the local range of uncovering coal,and the interception and decompression fracturing technology can be adopted for the gas disaster area.Through numerical simulation of the change of borehole permeability under different water pressures,the construction parameters of well group fracturing and interception and decompression fracturing are determined,and then the engineering application is carried out.The results show that through the implementation of well group fracturing technology,the permeability of coal seam increases.Under the condition that the negative pressure of extraction is basically the same,the gas concentration of single hole is higher.Compared with the location without well group fracturing,the initial concentration of single hole in fracturing borehole is higher and the gas volume is more.Through the implementation of interception and depressurization fracturing technology,the gas pressure in the fracturing area is released,the phenomenon of hole collapse is reduced,and the problem of high gas concentration exceeding the limit caused by nozzle hole is solved.This study provides a new way for gas prevention and control in deep mine mining.
作者
张国江
ZHANG Guojiang(Guizhou Branch of Shijiazhuang Design and Research Institute of Coal Industry)
出处
《现代矿业》
CAS
2023年第7期81-84,89,共5页
Modern Mining
关键词
深部矿井
水力压裂
井组压裂
拦截降压压裂
deep mine
hydraulic fracturing
well group fracturing
the interception and decompression fracturing
作者简介
张国江(1983-),男,工程师,550000贵州省贵阳市。
