Variable Pore Structure and Gas Permeability of Coal Cores after Microwave Irradiation
Yi-du Hong,
Bai-quan Lin,
Hua Xiang,
Chuan-jie Zhu,
Zheng Wang,
Wen Nie
Affiliations
Yi-du Hong
Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Quanzhou, Fujian 362000, China
Bai-quan Lin
School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
Hua Xiang
Department of Offshore Oil and Gas Field Development, Faculty of Oil and Gas Field Development, Gubkin Russian State University of Oil and Gas, Moscow 119991, Russia
Chuan-jie Zhu
School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
Zheng Wang
School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
Wen Nie
Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Quanzhou, Fujian 362000, China
The experimental work in this paper investigated the effect of microwave energy on pore structure and gas permeability of coal cores. Fifteen coal samples were irradiated under the condition of 2.45 GHz with 6 kW. The effect of microwave irradiation on the pore structure of coal samples was evaluated by nuclear magnetic resonance (NMR). The water saturation degree has little influence on transverse relaxation time (T2) distribution before the microwave treatment. By contrast, water saturation degree obviously affects the T2 distribution after the microwave energy treatment. Coal permeability increased after microwave energy treatment. But fractal dimension decreased after microwave energy treatment. The results show that microwave energy has a potential for degassing coal seams.
