Cargando…
Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity
Porous structures of shales are reconstructed using the markov chain monte carlo (MCMC) method based on scanning electron microscopy (SEM) images of shale samples from Sichuan Basin, China. Characterization analysis of the reconstructed shales is performed, including porosity, pore size distribution...
Autores principales: | , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4308705/ https://www.ncbi.nlm.nih.gov/pubmed/25627247 http://dx.doi.org/10.1038/srep08089 |
_version_ | 1782354569378922496 |
---|---|
author | Chen, Li Zhang, Lei Kang, Qinjun Viswanathan, Hari S. Yao, Jun Tao, Wenquan |
author_facet | Chen, Li Zhang, Lei Kang, Qinjun Viswanathan, Hari S. Yao, Jun Tao, Wenquan |
author_sort | Chen, Li |
collection | PubMed |
description | Porous structures of shales are reconstructed using the markov chain monte carlo (MCMC) method based on scanning electron microscopy (SEM) images of shale samples from Sichuan Basin, China. Characterization analysis of the reconstructed shales is performed, including porosity, pore size distribution, specific surface area and pore connectivity. The lattice Boltzmann method (LBM) is adopted to simulate fluid flow and Knudsen diffusion within the reconstructed shales. Simulation results reveal that the tortuosity of the shales is much higher than that commonly employed in the Bruggeman equation, and such high tortuosity leads to extremely low intrinsic permeability. Correction of the intrinsic permeability is performed based on the dusty gas model (DGM) by considering the contribution of Knudsen diffusion to the total flow flux, resulting in apparent permeability. The correction factor over a range of Knudsen number and pressure is estimated and compared with empirical correlations in the literature. For the wide pressure range investigated, the correction factor is always greater than 1, indicating Knudsen diffusion always plays a role on shale gas transport mechanisms in the reconstructed shales. Specifically, we found that most of the values of correction factor fall in the slip and transition regime, with no Darcy flow regime observed. |
format | Online Article Text |
id | pubmed-4308705 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-43087052015-02-09 Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity Chen, Li Zhang, Lei Kang, Qinjun Viswanathan, Hari S. Yao, Jun Tao, Wenquan Sci Rep Article Porous structures of shales are reconstructed using the markov chain monte carlo (MCMC) method based on scanning electron microscopy (SEM) images of shale samples from Sichuan Basin, China. Characterization analysis of the reconstructed shales is performed, including porosity, pore size distribution, specific surface area and pore connectivity. The lattice Boltzmann method (LBM) is adopted to simulate fluid flow and Knudsen diffusion within the reconstructed shales. Simulation results reveal that the tortuosity of the shales is much higher than that commonly employed in the Bruggeman equation, and such high tortuosity leads to extremely low intrinsic permeability. Correction of the intrinsic permeability is performed based on the dusty gas model (DGM) by considering the contribution of Knudsen diffusion to the total flow flux, resulting in apparent permeability. The correction factor over a range of Knudsen number and pressure is estimated and compared with empirical correlations in the literature. For the wide pressure range investigated, the correction factor is always greater than 1, indicating Knudsen diffusion always plays a role on shale gas transport mechanisms in the reconstructed shales. Specifically, we found that most of the values of correction factor fall in the slip and transition regime, with no Darcy flow regime observed. Nature Publishing Group 2015-01-28 /pmc/articles/PMC4308705/ /pubmed/25627247 http://dx.doi.org/10.1038/srep08089 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/ |
spellingShingle | Article Chen, Li Zhang, Lei Kang, Qinjun Viswanathan, Hari S. Yao, Jun Tao, Wenquan Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity |
title | Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity |
title_full | Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity |
title_fullStr | Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity |
title_full_unstemmed | Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity |
title_short | Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity |
title_sort | nanoscale simulation of shale transport properties using the lattice boltzmann method: permeability and diffusivity |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4308705/ https://www.ncbi.nlm.nih.gov/pubmed/25627247 http://dx.doi.org/10.1038/srep08089 |
work_keys_str_mv | AT chenli nanoscalesimulationofshaletransportpropertiesusingthelatticeboltzmannmethodpermeabilityanddiffusivity AT zhanglei nanoscalesimulationofshaletransportpropertiesusingthelatticeboltzmannmethodpermeabilityanddiffusivity AT kangqinjun nanoscalesimulationofshaletransportpropertiesusingthelatticeboltzmannmethodpermeabilityanddiffusivity AT viswanathanharis nanoscalesimulationofshaletransportpropertiesusingthelatticeboltzmannmethodpermeabilityanddiffusivity AT yaojun nanoscalesimulationofshaletransportpropertiesusingthelatticeboltzmannmethodpermeabilityanddiffusivity AT taowenquan nanoscalesimulationofshaletransportpropertiesusingthelatticeboltzmannmethodpermeabilityanddiffusivity |