Experimental study on the petrophysical variation of different rank coals with microwave treatment

Li, He, Lin, Baiquan, Yang, Wei, Zheng, Chunshan, Hong, Yidu, Gao, Yabin, Liu, Tong and Wu, Shiliang (2016) Experimental study on the petrophysical variation of different rank coals with microwave treatment. International Journal of Coal Geology, 154-155 82-91. doi:10.1016/j.coal.2015.12.010

Author Li, He
Lin, Baiquan
Yang, Wei
Zheng, Chunshan
Hong, Yidu
Gao, Yabin
Liu, Tong
Wu, Shiliang
Title Experimental study on the petrophysical variation of different rank coals with microwave treatment
Journal name International Journal of Coal Geology   Check publisher's open access policy
ISSN 0166-5162
Publication date 2016-01-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.coal.2015.12.010
Open Access Status Not Open Access
Volume 154-155
Start page 82
End page 91
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 2103 Fuel Technology
1907 Geology
1905 Economic Geology
1913 Stratigraphy
Abstract To maximize coalbed methane recovery, the reservoir is often stimulated because of its low permeability. An exploratory study on improving coal porosity and permeability by microwave treatment was proposed. Pore size distribution of four unconstrained coals (lignite, subbituminous, bituminous, and anthracite), before and after microwave treatment, were evaluated using the nuclear magnetic resonance. With continuous exposure to microwaves, the pore size distribution of coals (especially the lignite coal) extends, and the pore volume and connectivity increase. In addition, coal porosity and permeability evaluated based on the Schlumberger Doll Research model increase by 33–72% and 73–181%, respectively. The mechanism was revealed by combining P-wave tests, thermal imaging and X-ray computed tomography scanner. The moisture and minerals bounded in pores are selectively heated and then detached, and, as a result, the pore structure is opened. Continued exposure to microwaves rapidly converts the mobilized moisture into super-heated steam. Under the steam pressure, pores and fractures generally expand. Borrowing from microwave-assist oil recovery, we presented a conceptual design of a CBM extraction borehole with microwave irradiation.
Keyword Coalbed methane
Pore structure
Nuclear magnetic resonance
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
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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