TY - JOUR
TI - Experimental investigations of CO2 seepage behaviorin naturally fractured coal under hydro-thermal-mechanical conditions
AU - Teng Teng
AU - Zhu Xiaoyan
AU - Wang Yu-Ming
AU - Ren Chao-Yang
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4651
EP - 4658
PT - Article
AB - Gas-flow in coal or rock is hypersensitive to the changes of temperature,  confin­ing pressure and gas pressure. This paper implemented a series of  experiments to observe the seepage behavior, especially the permeability  evolution of CO2 in naturally fractured coal sample under coupled  hydro-thermal-mechanical conditions. The experimental results show that coal  permeability increases exponentially with the increasing gas pressure, and  tends to be linear when the confining pressure is high. Coal permeability  decreases exponentially with the increasing confining pressure. Coal  permeability decreases with the increasing temperature generally, but it  may bounce up when the temperature rises to high. The results provide  reference for the projects of coal gas extraction and carbon dioxide  geological sequestration.