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Energies 2017, 10(9), 1350; doi:10.3390/en10091350

Permeability Change Caused by Stress Damage of Gas Shale

1
State Key Laboratory of Offshore Oil Exploitation, CNOOC Research Institute, Beijing 100028, China
2
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
3
School of Mechanical Engineering, Yangtze University, Wuhan 430100, China
*
Authors to whom correspondence should be addressed.
Received: 30 July 2017 / Revised: 23 August 2017 / Accepted: 31 August 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Oil and Gas Engineering)
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Abstract

Stress damage of shale during the uniaxial loading process will cause the change of permeability. The study of stress sensitivity of shale has focused on the influence of confining pressure on shale permeability and the change of shale permeability during the loading process of axial stress is lacking. The permeability of gas shale during loading process was tested. The results show that shale damage macroscopically reflects the process of axial micro-cracks generation and expansion, and the axial micro-cracks will cause permeability change during the loading process. There is a good corresponding relationship between damage development and micro-crack expansion during the process of shale loading. The damage factor will increase in the linear elastic stage and enlarge rapidly after entering the stage of unstable micro-crack expansion, and the permeability of shale increases with the increasing of shale damage. The research results provide a reliable test basis for further analysis of the borehole instability and hydraulic fracture mechanisms in shale gas reservoirs. View Full-Text
Keywords: shale gas; stress damage; micro-crack; permeability shale gas; stress damage; micro-crack; permeability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yan, C.; Cheng, Y.; Deng, F.; Tian, J. Permeability Change Caused by Stress Damage of Gas Shale. Energies 2017, 10, 1350.

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