西安科技大学学报2018，Vol.38Issue(1)：59-64,6.DOI:10.13800/j.cnki.xakjdxxb.2018.0109
低透煤层CO2相变致裂增透解吸技术的应用
Application of CO2phase transformation fracturing enhanced desorption technology in low permeability coal seam
摘要
Abstract
In order to improve the gas extraction effect of soft and low permeability coal seam in karst geological condition of Guizhou Province,the CO2phase transformation fracturing enhanced desorption technology was applied to improve the permeability of coal seams,gas drainage quantity and drainage efficiency. The effect of CO2transformation fracturing enhanced desorption technology and deep hole pre-cracking on the pressure relief was applied in Lv tang coal mine working face relieving stress,and improved permeability effect was compared with deep hole pre-cracking. It is pointed that the effect of CO2transformation in this region is obvious,and the permeability coefficient of the former coal seam is about 1.9 times higher than that of the deep hole pre-cracking. CO2attenuation coefficient after fractu-ring is about 20% lower than the deep hole pre splitting,CO2average drainage concentration is about 70%.The results indicate that based on the CO2phase transformation fracturing enhanced desorption technology,the overall coal mine drainage efficiency is increased by about 6 times,greatly shorten the period of extraction standards,provide a reference for the similar coal mine gas control.关键词
瓦斯/CO2相变/深孔预裂/增透/低透Key words
gas/CO2phase transformation/deep borehole pre-cracking/permeability improvement/low permeability分类
资源环境引用本文复制引用
罗朝义,江泽标,郑昌盛,田世祥,韦善阳,张海清..低透煤层CO2相变致裂增透解吸技术的应用[J].西安科技大学学报,2018,38(1):59-64,6.基金项目
贵州省科技计划(黔科合支撑[2017]2815) （黔科合支撑[2017]2815）
贵州省科学技术基金(黔科合J字[2015]2049号) （黔科合J字[2015]2049号）
贵州大学研究生创新基金(研理工2017087) （研理工2017087）
