Evolution of coal petrophysical properties under microwave irradiation stimulation for different water saturation conditions

Li, He, Lin, Baiquan, Chen, Zhongwei, Hong, Yidu and Zheng, Chunshan (2017) Evolution of coal petrophysical properties under microwave irradiation stimulation for different water saturation conditions. Energy and Fuels, . doi:10.1021/acs.energyfuels.7b00553

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Author Li, He
Lin, Baiquan
Chen, Zhongwei
Hong, Yidu
Zheng, Chunshan
Title Evolution of coal petrophysical properties under microwave irradiation stimulation for different water saturation conditions
Journal name Energy and Fuels   Check publisher's open access policy
ISSN 0887-0624
1520-5029
Publication date 2017-08-02
Sub-type Article (original research)
DOI 10.1021/acs.energyfuels.7b00553
Open Access Status File (Author Post-print)
Total pages 27
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Coalbed methane (CBM) reservoirs generally have very low permeability and requires stimulation to make gas extraction economical. Hydraulic fracturing has been widely applied to enhance CBM productivity, but this technology has a number of key limitations, including fractures only propagate along existing joints, large amount of water usage, and potential environmental impact. Microwave irradiation technology can likely overcome the above limitations. In this study, the effect of microwave irradiation on the petrophysical properties of an unconstrained bituminous coal was comprehensively investigated through a suite of integrated diagnostic techniques including Nuclear Magnetic Resonance and X-ray Computed Tomography. A series of experiments were conducted both on centrifuged samples and on samples with different water contents ranging from 1 to 15%. The mineral removal and moisture evaporation due to the microwave selective heating lead to the enlargement, opening, and interconnection of coal pores. The NMR-determined porosity increases linearly with the microwave power while grows exponentially with respect to water contents. When the water content is above 6%, the porosity increases by around 98~211%. The fracture volume and coal permeability increase while the P-wave velocity decreases with increasing water contents. Microwave irradiation is effective in enlarging mesopores and macropores and in enhancing the pore connectivity. The significant enhancement of coal permeability and pore fracture structure indicates that the microwave irradiation is effective in improving gas productivity thus has the potential to become a new CBM reservoir simulation technology.
Keyword Reservoir stimulation
Microwave irradiation
Coal permeability
Nuclear Magnetic Resonance
Water content
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Created: Mon, 07 Aug 2017, 14:39:19 EST by Zhongwei Chen on behalf of School of Mechanical and Mining Engineering