Experimental Study on Evolution of Fracture Network and Permeability Characteristics of Bituminous Coal Under Repeated Mining Effect

2021 ◽  
Author(s):  
Lei Zhang ◽  
Mengqian Huang ◽  
Mingxue Li ◽  
Shuo Lu ◽  
Xiaochuan Yuan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Bituminous Coal ◽  
Fracture Network ◽  
Permeability Characteristics

Effects of acid-based fracturing fluids with variable hydrochloric acid contents on the microstructure of bituminous coal: An experimental study

Energy ◽  
2021 ◽  
pp. 122621
Author(s):  
Wang Zepeng ◽  
Ge Zhaolong ◽  
Li Ruihui ◽  
Liu Xianfeng ◽  
Wang Haoming ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hydrochloric Acid ◽  
Bituminous Coal ◽  
Fracturing Fluids

scholarly journals Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Zhen Liu ◽  
Mingrui Zhang ◽  
Shijian Yu ◽  
Lin Xin ◽  
Gang Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pore Structure ◽  
Coal Gasification ◽  
Thermal Damage ◽  
Fractal Model ◽  
Utilization Efficiency ◽  
Heating Process ◽  
Underground Coal Gasification ◽  
External Temperature ◽  
Permeability Characteristics

Underground coal gasification and exploitation of geothermal mine resources can effectively improve coal conversion and utilization efficiency, and the basic theory of the above technologies generally relies on the change law of the coal pore structure under thermal damage. Therefore, the influence mechanism of the development of the coal pore structure under thermal damage is analyzed by the nuclear magnetic resonance experiment, and the temperature-permeability fractal model is created. The results show that compared with microtransitional pores, the volume of meso-macropores in the coal body is more susceptible to an increase in temperature, which was most obvious at 200-300°C. During the heating process, the measured fractal dimension based on the T2 spectral distribution is between 2 and 3, indicating that the fractal characteristics did not disappear upon a change in external temperature. The temperature has a certain negative correlation with DmNMR, DMNMR, and DNMR, indicating that the complexity of the pore structure of the coal body decreased gradually with the increase of the temperature. Compared with the permeability calculated based on the theoretical permeability fractal model, the permeability obtained from the temperature-permeability fractal model has a similar increasing trend as the permeability measured by the NMR experiment when the temperature increases. The experimental study on pore structure and permeability characteristics of the low metamorphic coal under thermal damage provides a scientific theory for underground coal gasification and geothermal exploitation.

scholarly journals Numerical Simulation and Experimental Study on Blending Lignite from Bituminous Coal Boiler

2019 ◽  
Vol 310 ◽  
pp. 032017
Author(s):  
Qian Wang ◽  
WU Kai ◽  
LIU Zhuan ◽  
XIA Yong-jun ◽  
Xu-guang Zhou
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Bituminous Coal ◽  
Coal Boiler

scholarly journals Experimental study on the seepage characteristics of bituminous coal under the conditions of liquid nitrogen fracturing

2019 ◽  
Vol 7 (5) ◽  
pp. 2138-2154 ◽  
Author(s):  
Shuai Chen ◽  
Lei Zhang ◽  
Cun Zhang ◽  
Mengqian Huang
Keyword(s):  
Experimental Study ◽  
Liquid Nitrogen ◽  
Bituminous Coal ◽  
Seepage Characteristics
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