摘要
为了研究CO_2致裂增透技术对贵州低渗透煤层瓦斯抽采的影响,以贵州宏发煤矿1903工作面回风巷为研究对象,进行CO_2致裂增透试验研究。研究表明:煤层致裂后,其透气性系数平均为原始煤层的3.05倍,煤层的透气性显著提高;煤层瓦斯平均抽采浓度增大了4.19倍,平均抽采纯量为原始煤层的3.99倍;在钻孔瓦斯抽采率方面,单孔的瓦斯抽采效果提高了2.58~3.92倍;钻孔工作量降低了4倍,抽采达标时间缩短了55d,瓦斯涌出量降低了40%,煤层瓦斯抽采效益显著。CO_2致裂增透技术为解决贵州矿区低透煤层的瓦斯抽采技术难题提供了参考和借鉴。
In order to study the effect of CO2 fracturing anti-reflection technology on Guizhou low permeability coal seams,this paper took Guizhou Hongfa coal mine 1903 tailentry as study object, the CO2 cracker fracturing experiment was studied. The results show： after fracturing anti-reflection, the average permeability coefficient is 3.05 times of that of original coal seams, the permeability of coal seam has been improved remarkably;the average concentration of coal seam gas extraction is 4. 19 times and the average pumping capacity is 3.99 times of the area of no fracturing;in the borehole gas drainage rate,the single hole gas extraction effect in CO2 fracture enhanced permeability area has been increased by 2.58 ~ 3.92 times than the area borehole gas extraction without fracturing. The amount of drilling work in the fracturing enhanced permeability zone is 4 times lower than that without fracturing. The extraction time of the mining face is shortened by 55 days, the gas emission rate of the working face is reduced by 40%, and the gas extraction efficiency of the coal seam has been improved remarkably. The CO2 fracturing and permeability enhancement technology provides a reference for solving the problem of gas extraction in low permeable seams in GuiZhou mining area.
出处
《中国矿业》
北大核心
2018年第2期112-116,共5页
China Mining Magazine
基金
贵州大学引进人才科研项目资助(编号:贵大人基合字[2016]59号)
贵州省科技计划项目资助(编号:黔科合支撑[2017]2815)
贵州省科学技术基金项目资助(编号:黔科合J字[2015]2049号)
贵州大学研究生创新基金资助(编号:研理工2017087)
关键词
低渗透煤层
CO2致裂
增透技术
瓦斯抽采
low permeability coal seam
CO2 fracturing
anti-reflection technology
gas extraction
