Open AccessExperimental investigations of CO2 seepage behaviorin naturally fractured coal under hydro-thermal-mechanical conditions
Author(s) -
Teng Teng,
Xiaotian Zhu,
Yuming Wang,
Chao-Yang Ren
Publication year - 2021
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci2106651t
Subject(s) - coal , permeability (electromagnetism) , overburden pressure , thermal , petroleum engineering , carbon dioxide , coal mining , geology , methane , materials science , geotechnical engineering , environmental science , waste management , thermodynamics , chemistry , biochemistry , physics , organic chemistry , membrane , engineering
Gas-flow in coal or rock is hypersensitive to the changes of temperature, confin?ing 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.