期刊
POWDER TECHNOLOGY
卷 346, 期 -, 页码 97-108出版社
ELSEVIER
DOI: 10.1016/j.powtec.2019.02.009
关键词
Microwave heating; Dielectric property; Nuclear magnetic resonance; Pore structure; Multifractal analysis
资金
- National Natural Science Foundation of China [51774135, 51704111, 51604110, 51504093, 51474211, 51374003]
- Scientific Research Foundation for Doctor of Hunan University of Science and Technology [E51882]
As a clean energy resource, coalbed methane (CBM) has drawn worldwide attention. However, the CBM reservoir has strong adsorption capacity and low permeability and thus requires stimulation. Realized by the conversion of the electromagnetic energy into the thermal energy, microwave heating may be a sound stimulation method. In this study, the effect of microwave heating on the petrophysical characteristics of coal was investigated by combining modelling, experiment and analysis. The numerical model coupled the electromagnetic and heat transfer physics by the thermal-dependent coal permittivity. The results indicate that the increase in the microwave power contributes not only to rapid heating but also to thermal heterogeneity. The Nuclear Magnetic Resonance (NMR) tests show that microwave heating can induce the enlargement, opening and interconnection of pores and fractures in coal. Furthermore, the NMR multifractal theory was proposed for quantitative pore structure characterization. The calculated adsorption fractal dimension increases with the temperature, while the seepage fractal dimension shows a positive linear correlation with the thermal heterogeneity. Outcomes of this study provide valuable insight into microwave-assisted CBM recovery. (C) 2019 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据