重庆大学学报2018，Vol.41Issue(2)：96-102,7.DOI:10.11835/j.issn.1000-582X.2018.02.012
不同注源气体置换-驱替煤层甲烷突破时间的差异性分析
Analysis on the difference of breakthrough time for different injection gases to replace-displace methane in coal seams
摘要
Abstract
Coal gas injection is an intensive extraction technology which is gradually developed in recent years,and the breakthrough time of gas injection is one of the important parameters of the technology.The breakthrough time is the required time of injection gas goes from one end of the coal seam to the other end, and it is closely related to the adsorption and the permeability of the source gas.In order to study the laws of permeability and adsorption on the breakthrough time,the laboratory simulation experiment is carried out with injecting He,N2 and CO 2 in coal seams to replace-displace CH 4 .The results show that the breakthrough time on pure seepage of N2 and CO 2 is very short,only 5.93％ and 0.28％ of the total breakthrough time,which indicates that gas adsorption performance is the main factor that causes the difference of breakthrough time.The breakthrough time increases as the gas adsorption performace of injection gas increases,and the breakthrough time of He,N2 and CO 2 is 0.92 min,14 min and 246 min, respectively.According to the laboratory experiment and theoretical model analysis,it can be concluded that the stronger the adsorption performance of injection gas is,the longer the breakthrough time and the more obvious the replacement effect in the initial stage of gas injection is,but the displacement effect gradually increases as the adsorption of the injection gas tends to be saturated.关键词
煤层注气/注源气体/置换-驱替效应/突破时间/差异性分析Key words
gas injection into coal seam/injection gas/replacement-displacement effect/breakthrough time/difference analysis分类
矿业与冶金引用本文复制引用
杨宏民,鲁小凯,陈立伟..不同注源气体置换-驱替煤层甲烷突破时间的差异性分析[J].重庆大学学报,2018,41(2):96-102,7.基金项目
国家自然科学基金资助项目(51174081) （51174081）
河南省高校科技创新团队支持计划资助项目(17IRTSTHN030).Supported by National Natural Science Foundation of China(51174081)and Program for Innovative Research Team (in Science and Technology)in Universit iesof Heaan （17IRTSTHN030）
