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- Title
煤基质变形影响下含瓦斯煤渗透率动态变化规律.
- Authors
李祥春; 黄 涛; 陈小龙; 安振兴; 陆卫东; 陈志峰
- Abstract
Coal permeability not only has a direct effect on the exploitation effect of coalbed methane (commonly called gas), but also is the key parameter in the calculation of gas emission. In order to investigate the variation laws of the permeability of coal-containing gas under different pressures, it is necessary to establish a dynamic evolution model of the permeability of coal-containing gas under different pressures by considering the comprehensive effects of effective stress and gas adsorption/desorption on coal permeability. Then, a permeability measurement experiment under triaxial stress state was carried out on the coal samples taken from Yuecheng Mine Field of Shanxi Jinmei Group. Moreover, the experimental results and model calculation results were compared. Finally, the dynamic variation laws of the permeability of coal-containing gas under different pressures were discussed. And the following research results were obtained. First, the permeability–pressure relationship curve is in an irregular "U" shape. In the phase of lower pressure, as the pressure increases, the amount of the gas adsorbed by the surface of coal matrix increases, the influence of coal rock expansion deformation on the permeability is dominant and the permeability decreases rapidly. As the pressure gradually increases, the gas adsorption capacity gets saturated, the effect of effective stress on permeability gradually dominates and the permeability increases slightly. Second, the experimental results and the model calculation results are basically accordant and their variation trends are also consistent. It is concluded that the proposed dynamic evolution model for the permeability of coal-containing gas is reliable and can provide technical support for the prevention of coal and gas outburst and the effective exploitation of coalbed methane.
- Subjects
GAS absorption &; adsorption; GAS bursts; COALBED methane; COAL gas; ROCK deformation; PERMEABILITY measurement; ADSORPTION capacity; PERMEABILITY
- Publication
Natural Gas Industry, 2020, Vol 40, Issue 1, p83
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2020.01.011