An Improved Gas Permeability Evolution Model of Coal Containing Gas with Klinkenberg Effect

2016 ◽  
Vol 35 (1) ◽  
pp. 433-443 ◽  
Author(s):  
Jiajia Liu ◽  
Kai Wang ◽  
Liang Wang ◽  
Aitao Zhou
Keyword(s):  
Gas Permeability ◽  
Evolution Model ◽  
Permeability Evolution ◽  
Klinkenberg Effect

scholarly journals Coupled Effects of Stress, Moisture Content and Gas Pressure on the Permeability Evolution of Coal Samples: A Case Study of the Coking Coal Resourced from Tunlan Coalmine

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1653
Author(s):  
Guofu Li ◽  
Yi Wang ◽  
Junhui Wang ◽  
Hongwei Zhang ◽  
Wenbin Shen ◽  
...  
Keyword(s):  
Moisture Content ◽  
Coalbed Methane ◽  
Gas Permeability ◽  
Axial Stress ◽  
Gas Pressure ◽  
Pressure Curve ◽  
Permeability Evolution ◽  
Confining Stress ◽  
Qinshui Basin ◽  
Gas Seepage

Deep coalbed methane (CBM) is widely distributed in China and is mainly commercially exploited in the Qinshui basin. The in situ stress and moisture content are key factors affecting the permeability of CH4-containing coal samples. Therefore, considering the coupled effects of compressing and infiltrating on the gas permeability of coal could be more accurate to reveal the CH4 gas seepage characteristics in CBM reservoirs. In this study, coal samples sourced from Tunlan coalmine were employed to conduct the triaxial loading and gas seepage tests. Several findings were concluded: (1) In this triaxial test, the effect of confining stress on the permeability of gas-containing coal samples is greater than that of axial stress. (2) The permeability versus gas pressure curve of coal presents a ‘V’ shape evolution trend, in which the minimum gas permeability was obtained at a gas pressure of 1.1MPa. (3) The gas permeability of coal samples decreased exponentially with increasing moisture content. Specifically, as the moisture content increasing from 0.18% to 3.15%, the gas permeability decreased by about 70%. These results are expected to provide a foundation for the efficient exploitation of CBM in Qinshui basin.

Mining‐disturbed coal damage and permeability evolution: Model and validation

2021 ◽  
Author(s):  
Chao Xu ◽  
Mingyue Cao ◽  
Kai Wang ◽  
Qiang Fu ◽  
Liangliang Qin
Keyword(s):  
Evolution Model ◽  
Permeability Evolution ◽  
Coal Damage

scholarly journals A permeability evolution model of coal particle from the perspective of adsorption deformation

2021 ◽  
Vol 9 (4) ◽  
pp. 577-587
Author(s):  
Wei Liu ◽  
Deyao Wu ◽  
Hao Xu ◽  
Xiangyu Chu ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Coal Particle ◽  
Evolution Model ◽  
Permeability Evolution ◽  
Adsorption Deformation

Gas permeability evolution characteristics of limestone under different stress conditions

2022 ◽  
Vol 29 (1) ◽  
pp. 12
Author(s):  
Yin Zeng ◽  
Lu Wang ◽  
Chaofu Deng ◽  
Qiangxing Zhang ◽  
Zhide Wu ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Stress Conditions ◽  
Permeability Evolution ◽  
Evolution Characteristics

scholarly journals The Porosity Dynamic Model of the Compacted Broken Coal

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Xuefeng Han ◽  
Tingxiang Chu ◽  
Minggao Yu ◽  
Jiangkun Chao ◽  
Zhihui Ma ◽  
...  
Keyword(s):  
Spontaneous Combustion ◽  
Axial Stress ◽  
Fractal Theory ◽  
Dynamic Change ◽  
Strain Curve ◽  
Fractal Model ◽  
Evolution Model ◽  
Dynamic Evolution ◽  
Permeability Evolution ◽  
Loading Test

In order to study the dynamic change law of the porosity of the compacted broken coal under different axial stress loading, based on the environment of the broken and compacted coal in the gob, aiming at the influence of the porosity on the spontaneous combustion of the coal, combined with the fractal theory, the fractal model of the porosity of the broken coal is established. A self-designed “testing device for permeability evolution and spontaneous combustion characteristics of crushed coal under pressure” is used to carry out axial loading test on selected coal samples in the gob. By comparing and analyzing the calculated results of void dynamic evolution model and experimental data, it is found that the relative error of void dynamic evolution model is between 2.8% and 6.2%, which meets the engineering needs. According to the stress-strain curve, initial accumulation state parameters, fractal dimension of initial crushing, and particle size distribution, the change of porosity under different compacted conditions can be predicted by the model, which has certain significance for identifying the change of compacted broken coal porosity and analyzing the process of coal spontaneous combustion and oxidation.

Gas permeability evolution mechanism during creep of a low permeable claystone

2016 ◽  
Vol 129 ◽  
pp. 47-53 ◽  
Author(s):  
Z.B. Liu ◽  
J.F. Shao ◽  
T.G. Liu ◽  
S.Y. Xie ◽  
N. Conil
Keyword(s):  
Gas Permeability ◽  
Permeability Evolution ◽  
Evolution Mechanism

Experimental Study on Microscopic Structure and Permeability of Tectonic Soft Coal

2013 ◽  
Vol 734-737 ◽  
pp. 241-245
Author(s):  
Kui Gao ◽  
Wei Yi Xue
Keyword(s):  
Gas Permeability ◽  
Great Influence ◽  
Confining Pressure ◽  
Gas Pressure ◽  
Microscopic Structure ◽  
Klinkenberg Effect ◽  
Coal Permeability ◽  
Typical Sample ◽  
Soft Coal ◽  
Soft Coal Seam

To analyze the mining effect to gas permeability of tectonic soft coal seam, we choose typical sample from tectonic soft coal, study the gas permeability and microstructure. The results suggest that tectonic soft coal has been badly destroyed, and its micro fracture pore develops. Confining pressure has a great influence on the permeability of tectonic soft coal. When gas pressure remains constant, with the increase of confining pressure of tectonic soft coal permeability began to decrease very fast. But when decreasing to a certain degree, it changes slowly; when confining pressure remains constant, with the increase of gas pressure, permeability of tectonic soft coal first decreases and then increases. Under the condition of low gas pressure, tectonic soft coal permeability shows a significant Klinkenberg effect.

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