钻孔CF新型密封材料的孔隙结构特性研究

1.西安科技大学 能源学院,陕西 西安710054; 2.教育部 西部矿井开采及灾害防治重点实验室,陕西 西安 710054

孔隙结构特性; 密封性能; 普通水泥密封材料; 新型密封材料

Pore structure characteristics of CFnew type of sealing material for borehole
ZHANG Chao1,2,LI Shu-gang1,2,ZHANG Tian-jun1,2,LIN Hai-fei1,2,YANG Hui-jun1,2

(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploration and Hazard Prevention,Ministry of Education,Xi'an 710054,China)

pore structure characteristics; sealing performance; ordinary cement; new type of sealing material

DOI: 10.13800/j.cnki.xakjdxxb.2016.0112

备注

为了改善瓦斯抽采钻孔的封孔效果,研究了瓦斯抽采钻孔普通水泥密封材料、CF新型密封材料的孔隙结构特性。实验模拟了煤矿井下钻孔封孔过程,综合采用压汞法和二氧化碳气体吸附法对普通水泥注浆后的煤样和CF新型密封材料注浆后的煤样孔隙结构进行对比分析。结果 表明:CF新型密封材料相比普通水泥材料有着较好的渗透力,可以有效的消除钻孔封孔段周围微观裂隙和孔洞,提高封孔段的稳定性; 经过注浆之后,普通水泥材料注浆的煤样和CF新型密封材料注浆的煤样平均孔径分别为9,8.6 nm,孔隙率分别为4.428 1%,3.775 6%.

To improve the sealing effects on horizontal gas drainage borehole,the pore structure characteristics of ordinary cement and CF new type of sealing material for borehole are studied.Based on sealing process in the underground coal mine simulated by experiment,the pore structure of coal samples after grouting for ordinary cement and CF new type of sealing material are compared by means of mercury intrusion method and CO2 gas adsorption method.The results show that the CF new type of sealing material has a better permeability than ordinary cement,which can effectively eliminate fractures around boreholes and improve the stability of sealing segment.After grouting,the average pore diameter of coal samples for ordinary cement and CF new type of sealing material are 9 and 8.6 nm,respectively,and the porosity of the two are 4.428 1% and 3.775 6%,respectively.