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Energies 2018, 11(2), 329; https://doi.org/10.3390/en11020329

A Study of Nonlinear Elasticity Effects on Permeability of Stress Sensitive Shale Rocks Using an Improved Coupled Flow and Geomechanics Model: A Case Study of the Longmaxi Shale in China

1
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
2
PetroChina Exploration & Production Company, Beijing 100032, China
3
Natural Gas Division, Tarim Oilfield Company, CNPC, Xinjiang 841000, China
4
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 25 January 2018 / Accepted: 25 January 2018 / Published: 2 February 2018
(This article belongs to the Section Energy Sources)
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Abstract

Gas transport in shale gas reservoirs is largely affected by rock properties such as permeability. These properties are often sensitive to the in-situ stress state changes. Accurate modeling of shale gas transport in shale reservoir rocks considering the stress sensitive effects on rock petrophysical properties is important for successful shale gas extraction. Nonlinear elasticity in stress sensitive reservoir rocks depicts the nonlinear stress-strain relationship, yet it is not thoroughly studied in previous reservoir modeling works. In this study, an improved coupled flow and geomechanics model that considers nonlinear elasticity is proposed. The model is based on finite element methods, and the nonlinear elasticity in the model is validated with experimental data on shale samples selected from the Longmaxi Formation in Sichuan Basin China. Numerical results indicate that, in stress sensitive shale rocks, nonlinear elasticity affects shale permeability, shale porosity, and distributions of effective stress and pore pressure. Elastic modulus change is dependent on not only in-situ stress state but also stress history path. Without considering nonlinear elasticity, the modeling of shale rock permeability in Longmaxi Formation can overestimate permeability values by 1.6 to 53 times. View Full-Text
Keywords: shale gas reservoir; stress sensitive permeability hysteresis; coupled flow and geomechanics modeling; finite element methods; nonlinear elasticity; elastic modulus alteration shale gas reservoir; stress sensitive permeability hysteresis; coupled flow and geomechanics modeling; finite element methods; nonlinear elasticity; elastic modulus alteration
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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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Wei, C.; Wang, L.; Li, B.; Xiong, L.; Liu, S.; Zheng, J.; Hu, S.; Song, H. A Study of Nonlinear Elasticity Effects on Permeability of Stress Sensitive Shale Rocks Using an Improved Coupled Flow and Geomechanics Model: A Case Study of the Longmaxi Shale in China. Energies 2018, 11, 329.

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