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

2 Citations (Scopus)

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

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

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