Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling
Acoustic-wave velocities of shale rocks with different coring angles were tested by an acoustic-emission experiment under different confining pressures and soaking time of drilling fluid. Effects of stress and hydration coupling on the acoustic-wave velocities, elastic parameters, and anisotropic da...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-04-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1996-1073/11/4/926 |
| _version_ | 1811184928612679680 |
|---|---|
| author | Junchuan Gui Tianshou Ma Ping Chen Heyi Yuan Zhaoxue Guo |
| author_facet | Junchuan Gui Tianshou Ma Ping Chen Heyi Yuan Zhaoxue Guo |
| author_sort | Junchuan Gui |
| collection | DOAJ |
| description | Acoustic-wave velocities of shale rocks with different coring angles were tested by an acoustic-emission experiment under different confining pressures and soaking time of drilling fluid. Effects of stress and hydration coupling on the acoustic-wave velocities, elastic parameters, and anisotropic damage were analyzed and investigated. The following results were obtained: (1) Acoustic-wave velocities of shale rocks are related to the confining pressure, soaking time, and coring angles. (2) Both Young’s modulus and Poisson’s ratios increase with confining pressure under the same soaking time; under the same confining pressure, the changes of Young’s modulus and Poisson’s ratios with time are not as obvious as the confining pressure, but it shows that the Young’s modulus decreases, while the Poisson’s ratios increase. (3) With increasing confining pressure, the Thomsen coefficient ε showed an increasing trend, whereas the Thomsen coefficient γ exhibited the opposite trend; further, the anisotropy coefficient of P-wave (ε) is larger than the anisotropy coefficient of S-wave (γ). (4) Damage parameters parallel to bedding are greater than those perpendicular to bedding; when the confining pressure increases, the fracture pores gradually close, and both vertical and horizontal damage parameters are reduced. |
| first_indexed | 2024-04-11T13:20:42Z |
| format | Article |
| id | doaj.art-cf73b8e3f01a4e96b7f9ac8676784e31 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:20:42Z |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-cf73b8e3f01a4e96b7f9ac8676784e312022-12-22T04:22:12ZengMDPI AGEnergies1996-10732018-04-0111492610.3390/en11040926en11040926Anisotropic Damage to Hard Brittle Shale with Stress and Hydration CouplingJunchuan Gui0Tianshou Ma1Ping Chen2Heyi Yuan3Zhaoxue Guo4State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaMaintenance Center of Northwest Sichuan Gas Field, Southwest Oil and Gas Field Branch, Jiangyou 621709, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaAcoustic-wave velocities of shale rocks with different coring angles were tested by an acoustic-emission experiment under different confining pressures and soaking time of drilling fluid. Effects of stress and hydration coupling on the acoustic-wave velocities, elastic parameters, and anisotropic damage were analyzed and investigated. The following results were obtained: (1) Acoustic-wave velocities of shale rocks are related to the confining pressure, soaking time, and coring angles. (2) Both Young’s modulus and Poisson’s ratios increase with confining pressure under the same soaking time; under the same confining pressure, the changes of Young’s modulus and Poisson’s ratios with time are not as obvious as the confining pressure, but it shows that the Young’s modulus decreases, while the Poisson’s ratios increase. (3) With increasing confining pressure, the Thomsen coefficient ε showed an increasing trend, whereas the Thomsen coefficient γ exhibited the opposite trend; further, the anisotropy coefficient of P-wave (ε) is larger than the anisotropy coefficient of S-wave (γ). (4) Damage parameters parallel to bedding are greater than those perpendicular to bedding; when the confining pressure increases, the fracture pores gradually close, and both vertical and horizontal damage parameters are reduced.http://www.mdpi.com/1996-1073/11/4/926shale rockstress dependenthydration dependentanisotropydamage parameters |
| spellingShingle | Junchuan Gui Tianshou Ma Ping Chen Heyi Yuan Zhaoxue Guo Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling Energies shale rock stress dependent hydration dependent anisotropy damage parameters |
| title | Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling |
| title_full | Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling |
| title_fullStr | Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling |
| title_full_unstemmed | Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling |
| title_short | Anisotropic Damage to Hard Brittle Shale with Stress and Hydration Coupling |
| title_sort | anisotropic damage to hard brittle shale with stress and hydration coupling |
| topic | shale rock stress dependent hydration dependent anisotropy damage parameters |
| url | http://www.mdpi.com/1996-1073/11/4/926 |
| work_keys_str_mv | AT junchuangui anisotropicdamagetohardbrittleshalewithstressandhydrationcoupling AT tianshouma anisotropicdamagetohardbrittleshalewithstressandhydrationcoupling AT pingchen anisotropicdamagetohardbrittleshalewithstressandhydrationcoupling AT heyiyuan anisotropicdamagetohardbrittleshalewithstressandhydrationcoupling AT zhaoxueguo anisotropicdamagetohardbrittleshalewithstressandhydrationcoupling |