煤矿安全2017，Vol.48Issue(10)：17-20,4.DOI:10.13347/j.cnki.mkaq.2017.10.005
液态CO2相变致裂增透预抽瓦斯技术试验研究
Experimental Study on Increasing Coal Seam Permeability and Pre-drainage Gas by Liquid CO2 Phase-transforming Fracture
摘要
Abstract
In order to increase coal seam permeability,enhance the gas drainage efficiency,on the basis of the rock fracturing mechanism,mathematical model of crack extension by liquid CO2 blasting was established.Using COMSOL numerical software,transient model of liquid CO2 phase fracturing was established and by analyzing the laws of fractures development around drilling under the action of blasting air pressure;it is concluded that there are three zones of crushing zone,fissure zone and vibrating zone around the drillings.The basic theory,related equipment and construction technology were introduced and the industrial test experiment on liquid CO2 pre-splitting blasting was carried out in 152 belt conveyor diphead in Mabu Mine.The experiment result showed that:the average daily extraction concentration of single pore gas is 1.37 times the size of before blasting,the average daily extraction of single pore gas is 2.95 times the size of before blasting.The attenuation coefficient of gas flow decreased by 82.8％.关键词
液态CO2/相变致裂/增透/瓦斯抽采/巷道掘进/低透气性煤层Key words
liquid CO2/phase transition fracturing/permeability improvement/gas drainage/tunnel excavation/low permeability seam分类
矿业与冶金引用本文复制引用
韩颖,史晓辉,雷云,孙亮,郭杉..液态CO2相变致裂增透预抽瓦斯技术试验研究[J].煤矿安全,2017,48(10):17-20,4.基金项目
大型油气田及煤层气开发国家重大专项资助项目(2016ZX05067) （2016ZX05067）
国家自然科学基金资助项目(51404093) （51404093）
国家安全生产监督管理总局安全生产重大事故防治关键技术科技资助项目(henan-0025-2015AQ,henan-0007-2015AQ) （henan-0025-2015AQ,henan-0007-2015AQ）
