Permeability upscaling using cubic law based on the analysis of multi-resolution micro-CT images of intermediate rank coal

Alexandra Roslin, Dubravka Pokrajac, Yingfang Zhou (Corresponding Author)

Research output: Contribution to journalArticle

Abstract

This paper presents a method for upscaling permeability of fractured coal using the cubic law to quantify permeability of the fracture system. The version of the cubic law that incorporates the length/tortuosity effect available in the literature was modified by including a connectivity parameter. All parameters of the modified cubic law (fracture aperture, porosity, length, and connectivity) were estimated for a set of coal samples using quantitative methods available in the literature. The geometry of the fracture system within the coal samples was determined from micro computed tomography scans. Parameters of the modified cubic law estimated from the scans were validated by comparison of the resulting permeability to the numerical simulation of single-phase fluid flow in fractures, which was developed at the previous stage of this study. The modified cubic law was then used for upscaling of permeability from the millimeter scale to the centimeter scale. It produced the results that match the literature data for the coal from the same region as well as the experimental data for the studied area.
Original languageEnglish
Pages (from-to)8215-8221
Number of pages7
JournalEnergy & Fuels
Volume33
Issue number9
Early online date14 Aug 2019
DOIs
Publication statusPublished - 19 Sep 2019

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Coal
Tomography
Flow of fluids
Porosity
Geometry
Computer simulation

Keywords

  • permeability
  • flow simulation
  • upscaling
  • cubic law
  • coal fractures
  • FRACTURE
  • METHANE
  • FLUID-FLOW
  • CONNECTIVITY
  • SCALE
  • VALIDITY

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Chemical Engineering(all)
  • Fuel Technology

Cite this

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title = "Permeability upscaling using cubic law based on the analysis of multi-resolution micro-CT images of intermediate rank coal",
abstract = "This paper presents a method for upscaling permeability of fractured coal using the cubic law to quantify permeability of the fracture system. The version of the cubic law that incorporates the length/tortuosity effect available in the literature was modified by including a connectivity parameter. All parameters of the modified cubic law (fracture aperture, porosity, length, and connectivity) were estimated for a set of coal samples using quantitative methods available in the literature. The geometry of the fracture system within the coal samples was determined from micro computed tomography scans. Parameters of the modified cubic law estimated from the scans were validated by comparison of the resulting permeability to the numerical simulation of single-phase fluid flow in fractures, which was developed at the previous stage of this study. The modified cubic law was then used for upscaling of permeability from the millimeter scale to the centimeter scale. It produced the results that match the literature data for the coal from the same region as well as the experimental data for the studied area.",
keywords = "permeability, flow simulation, upscaling, cubic law, coal fractures, FRACTURE, METHANE, FLUID-FLOW, CONNECTIVITY, SCALE, VALIDITY",
author = "Alexandra Roslin and Dubravka Pokrajac and Yingfang Zhou",
note = "Acknowledgements This paper used opportunistic coal samples and characterization data as a part of a study into multiphase flow in coal for the Southern Qinshui coal basin. The measurement of this work was supported by the Royal Society through the National Natural Science Foundation of China (NSFC) Cost Share Project, and Alexandra Roslin thanks the Ministry of Education of Russia to support her Ph.D. work at the University of Aberdeen. The University of Aberdeen School of Engineering and School of Geosciences are thanked for their support. The authors also thank John Still from the University of Aberdeen School of Geosciences for his support regarding SEM data analysis.",
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doi = "10.1021/acs.energyfuels.9b01625",
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N1 - Acknowledgements This paper used opportunistic coal samples and characterization data as a part of a study into multiphase flow in coal for the Southern Qinshui coal basin. The measurement of this work was supported by the Royal Society through the National Natural Science Foundation of China (NSFC) Cost Share Project, and Alexandra Roslin thanks the Ministry of Education of Russia to support her Ph.D. work at the University of Aberdeen. The University of Aberdeen School of Engineering and School of Geosciences are thanked for their support. The authors also thank John Still from the University of Aberdeen School of Geosciences for his support regarding SEM data analysis.

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Y1 - 2019/9/19

N2 - This paper presents a method for upscaling permeability of fractured coal using the cubic law to quantify permeability of the fracture system. The version of the cubic law that incorporates the length/tortuosity effect available in the literature was modified by including a connectivity parameter. All parameters of the modified cubic law (fracture aperture, porosity, length, and connectivity) were estimated for a set of coal samples using quantitative methods available in the literature. The geometry of the fracture system within the coal samples was determined from micro computed tomography scans. Parameters of the modified cubic law estimated from the scans were validated by comparison of the resulting permeability to the numerical simulation of single-phase fluid flow in fractures, which was developed at the previous stage of this study. The modified cubic law was then used for upscaling of permeability from the millimeter scale to the centimeter scale. It produced the results that match the literature data for the coal from the same region as well as the experimental data for the studied area.

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