Abstract
Moisture and thermal are the key factors for influencing methane desorption during CBM exploitation. Using high‐pressure water injection technology into coalbed, new fractures and pathways are formed to transport methane. A phenomenon of water‐inhibiting gas flow existed. This study is focused on various water pressures impacted on gas‐adsorbed coal samples, and then the desorption capacity could be revealed under different conditions. And the results are shown that methane desorption capacity was decreased with the increase in water pressure at room temperature and the downtrend would be steady until water pressure was large enough. Heating could promote gas desorption capacity effectively, with the increasing of water injection pressures, and the promotion of thermal on desorption became more obvious. These results are expected to provide a clearer understanding of theoretical efficiency of heat water or steam injection into coalbed, and they can provide some theoretical and experimental guidance on CBM production and methane control.
Highlights
Coalbed methane, CBM, is a significant natural energy resource and plays an important role in the structure of clean and new energy in China
Ground stress, and gas pressure, as well as low gas permeability of coal seams, the gas extraction became difficult before mining [2]. e decrease in gas pressure during gas immigration can lead to gas desorption and cause matrix contraction, leading to fracture extension and further improving the permeability of the coal seam [3]
[5, 8,9,10,11], and they designed the ideal experimental process in which water was injected into the dry coal samples under the equilibrium state of gas absorption. All of these results showed that the maximum desorption quantity decreases gradually with the amount of injected water, but they were not considering different water pressures that impacted on the same or different equilibrium gas adsorption state
Summary
CBM, is a significant natural energy resource and plays an important role in the structure of clean and new energy in China. E decrease in gas pressure during gas immigration can lead to gas desorption and cause matrix contraction, leading to fracture extension and further improving the permeability of the coal seam [3]. Ese methods include ordinary drill, enhanced drills, coalbed water injection, hydraulic punching, hydraulic cutting, and hydraulic fracturing, and they are widely used in modern coal mining to improve coalbed permeability and gas output. All these processes are including high-pressure water. All these processes are including high-pressure water. us, if highpressure water has been injected into coalbed, the desorption capacity of methane would be effected due to moisture [5]
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