Insights on the gas permeability change in porous shale

Junqian Li; Tao Yu; Xu Liang; Pengfei Zhang; Chen Chen; Jie Zhang

doi:10.26804/ager.2017.02.01

Advances in Geo-Energy Research 2017, 1(2): 69-73 https://doi.org/10.26804/ager.2017.02.01

Invited Review |

Open Access | Issue | Published: 25 September 2017

Insights on the gas permeability change in porous shale

Show Author's Information Hide Author's Information Junqian Li^¹(

), Tao Yu^¹, Xu Liang^², Pengfei Zhang^¹, Chen Chen^¹, Jie Zhang^¹

1Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum (East China), Qingdao 266580, P. R. China

2CNOOC Research Institute, Beijing 100028, P. R. China

Keywords:

permeability, Shale gas, effective stress, matrix shrinkage, gas slippage, Knudsen diffusion.

Cite this article:

Li J, Yu T, Liang X, et al. Insights on the gas permeability change in porous shale. Advances in Geo-Energy Research, 2017, 1(2): 69-73. https://doi.org/10.26804/ager.2017.02.01

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Abstract

Due to abundant nanoscale pores developed in shale, gas flow in shale presents a complex dynamic process. This paper summarized the effects from effective stress increase, shale matrix shrinkage, gas slippage and Knudsen diffusion on the gas permeability change in shale during shale gas recovery. With the reduce in gas pressure, effective stress increase leads to the decline of the permeability in an exponential form; the permeability increases due to the shale matrix shrinkage induced by gas desorption; appearances of gas slippage and Knudsen diffusion cause an additional increase in the gas permeability particularly in small pores at low pressures. In addition, some reported models evaluating the shale permeability were reviewed preliminarily. Models considering these four effects may be potentially effective to evaluate the gas permeability change in shale.

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Insights on the gas permeability change in porous shale

Show Author's information Hide Author's Information Junqian Li^¹(

), Tao Yu^¹, Xu Liang^², Pengfei Zhang^¹, Chen Chen^¹, Jie Zhang^¹

1Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum (East China), Qingdao 266580, P. R. China

2CNOOC Research Institute, Beijing 100028, P. R. China

Abstract

Keywords: permeability, Shale gas, effective stress, matrix shrinkage, gas slippage, Knudsen diffusion.

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Publication history

Received: 06 June 2017

Revised: 28 June 2017

Accepted: 02 July 2017

Published: 25 September 2017

Issue date: September 2017

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Acknowledgements

This study was supported by the National Natural Science Foundation (41602131), and the Fundamental Research Funds for the Central Universities (17CX02074 and 17CX06036).

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Published with open access at Ausasia Science and Technology Press on behalf of the Division of Porous Flow, Hubei Province Society of Rock Mechanics and Engineering.

This article is distributed under the terms and conditions of the Creative Commons Attribution (CC BY-NC-ND) license (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.