Effects of Stress and Temperature on the Permeability of Gas-Saturated Wet Coal

Published on Nov 9, 2020in Energy & Fuels3.421
· DOI :10.1021/ACS.ENERGYFUELS.0C02487
Junhui Wang1
Estimated H-index: 1
(CUMT: China University of Mining and Technology),
Yi Wang1
Estimated H-index: 1
(TUT: Taiyuan University of Technology)
+ 3 AuthorsYan Wanzi1
Estimated H-index: 1
(CUMT: China University of Mining and Technology)
Sources
Abstract
Fracturing and heat injection are promising methods for in situ modification of low-permeability reservoirs to enhance coalbed methane (CBM) recovery. The technical processes enable substantial wat...
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Mining industries worldwide have inevitably resorted to exploiting resources from the deep underground. However, traditional mining methods can cause various problems, e.g., considerable mining difficulty, environmental degradations, and frequent disastrous accidents. To exploit deep resources in the future, the concept of mining must be reconsidered and innovative new theories, methods, and technologies must be applied. To effectively acquire coal resources deeper than 2000 m, new theoretical a...
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Abstract In this study, laboratory tests using six-cycles of nitrogen (N2) injection were carried out to investigate nitrogen flushing effect on coal seam gas recovery. In each test, N2 was injected for 200 min into a coal sample saturated with carbon dioxide (CO2), in a triaxial-loaded cell. Nitrogen injection was paused for about 20 h to allow gas desorption from the coal sample before commencing the next cycle. It was observed that CO2 levels of the outlet flow recovered from 3%-7% to 20%–40%...
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Abstract Coal porosity and permeability are highly stress-sensitive. Although the stress-dependent permeability behaviour of coal has been well documented in the literature, few studies are available which directly observe the dependency of fracture aperture, porosity and connectivity on effective stress. In this study, in-situ X-ray tomography was conducted using a novel X-ray transparent tri-axial core holder to provide a detailed characterization of coal fracture network evolution due to incr...
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Abstract Ground temperature rises with the increase of mining depth. In this study, in order to investigate the seepage properties of coal with slippage and temperature effects, a thermo-fluid-solid coupling experiment on the methane-bearing coal was performed via the triaxial servo-controlled seepage equipment. Then, the permeability of coal in the gas loading-unloading processes was measured under different temperatures. Finally, a fractal slippage effect model with the temperature effect was ...
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CO2 storage in deep unrecoverable coal seams has become an effective method to curb greenhouse gas emission, which also contributes to an increase in coalbed methane (CBM) production. Due to high temperature and pressure in deep coal seams, the injected CO2 remains in a supercritical state. However, the influence of injecting supercritical CO2 into coal seams on coal permeability is not particularly clear at present. Therefore, this paper conducted a series of studies through high-pressure triax...
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The present experimental study on permeability characteristics for raw coal under different stress states is implemented by applying the triaxial self-made ‘THM coupled with servo-controlled seepage apparatus for gas-containing coal’; the result indicates that the flow rate of gas in the coal sample gradually decreases with the nonlinear loading of axial pressure and increases with the nonlinear unloading of axial stress and confining pressure. The flow rate, axial stress and confining pressure ...
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