THERMAL SCIENCE
International Scientific Journal
EXPERIMENTAL INVESTIGATIONS OF CO2 SEEPAGE BEHAVIORIN NATURALLY FRACTURED COAL UNDER HYDRO-THERMAL-MECHANICAL CONDITIONS
ABSTRACT
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.
KEYWORDS
PAPER SUBMITTED: 2020-06-01
PAPER REVISED: 2020-07-10
PAPER ACCEPTED: 2020-07-29
PUBLISHED ONLINE: 2021-12-24
THERMAL SCIENCE YEAR
2021, VOLUME
25, ISSUE
Issue 6, PAGES [4651 - 4658]
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