摘要
基于双重介质煤体中的瓦斯流动机理,考虑瓦斯在煤基质内的解吸、运移、释放及其在裂隙内的流动过程,建立了双重介质煤体钻孔瓦斯双渗流数学模型,并运用有限差分法编制了数值模拟程序.结果表明:煤基质内瓦斯压力呈非均匀分布,且其下降速率远小于裂隙;距钻孔壁的距离不同,煤基质表现出不同的瓦斯解吸特征.通过对比模拟结果与现场实测数据,验证了双重介质煤体钻孔瓦斯双渗流模型的正确性,同时表明该模型较传统的连续介质模型有更好的适用性.
Based on the methane flow mechanism in a dual-porosity coal,and methane desorption,migration and release in the coal matrix and methane flow in the fracture were considered.The mathematical model of borehole methane flow in a dual-porosity,dual-permeability coal seam was proposed.The finite difference method was applied to develop a numerical program to calculate the model.The results show that the distribution of gas pressure in coal matrix is heterogeneity,and the decline rate of gas pressure in coal matrix is much smaller than that in fracture.Because of its distance from the borehole wall,the coal matrix presents various gas desorption characteristics.The dual-porosity,dual-permeability model for simulating borehole methane flow is validated to be correct by comparing the simulation results and the field data,and it also indicates that the proposed model shows better applicability than the traditional continuous medium model.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2016年第6期1111-1117,共7页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划(973)项目(2011CB201202)
中国矿业大学(北京)博士研究生拔尖创新人才培育基金项目
关键词
煤
瓦斯
钻孔
双重介质
双渗流
数值模拟
coal
gas
borehole
dual-porosity
dual-permeability
numerical simulation
作者简介
通信作者：刘鹏（1988-），男，河南省正阳县人，博士研究生，从事矿井瓦斯防治、煤层气模拟等方面的研究．E-mail：liupengfjrstone@163．comTel：18311086718
