煤矿安全2024，Vol.55Issue(12)：90-96,7.DOI:10.13347/j.cnki.mkaq.20231197
低温冷冲击饱水对煤体渗流性质的影响及增透试验研究
The Influence of low-temperature cold shock saturated water on the permeability characteristics of coal body and experimental study on permeability enhancement
摘要
Abstract
In the development of coalbed methane(CBM),due to the generally low permeability of coal beds,effective permeability enhancement technology is needed to improve the extraction efficiency of CBM.Among them,low-temperature fracturing and per-meability enhancement technology has been widely studied and applied.In this paper,we simulate the low-temperature environment in actual mining by applying low-temperature cold impact water saturation treatment to the coal body,in order to investigate the mechanical properties and seepage law of the coal body saturated with cold impact water at different temperature conditions.Negat-ive pressure water-saturated device is used to saturate the specimen,after the specimen is completely saturated with water,it is put into the high and low temperature test chamber,and different specimens are impacted at room temperature,0℃,-20℃and-40℃,respectively.After the cold shock treatment of water-saturated specimens was completed,a triaxial percolation meter was used to carry out percolation test and triaxial compression test.The test results show that:cold shock treatment of water-saturated specimens will cause damage to the specimen,the development and expansion of internal cracks in the coal body,the specimen compressive strength decreases,and the permeability increases.And with the decrease of cold impact temperature,the permeability of the speci-men gradually increases.The initial permeability of the specimen impacted at-40℃was the largest,which increased by 202.9%compared with the normal temperature specimen.关键词
煤层气/冷冲击/渗透率/低温致裂/饱水试样/声发射Key words
coalbed methane/cold shock/permeability/low temperature cracking/water-saturated coal sample/acoustic emission分类
矿业与冶金引用本文复制引用
王珂,袁浩,刘红威,戎彦龙..低温冷冲击饱水对煤体渗流性质的影响及增透试验研究[J].煤矿安全,2024,55(12):90-96,7.基金项目
国家自然科学基金资助项目(52304246) （52304246）
山西省基础研究计划(自由探索类)资助项目(20210302124222) （自由探索类）
山西省回国留学人员科研资助项目(2023-057) （2023-057）
