Research Article
Study on Wellbore Stability and Failure Regions of Shale considering the Anisotropy of Wellbore Seepage
Table 2
Mechanical parameters of stratigraphic foundation of the Longmaxi formation.
| | Parameters | Value | Parameters | Value |
| | Depth (m) | 2450 | Cohesion of rock matrix (MPa) | 7.77 | | Vertical stress gradient (g/cm3) | 2.61 | Friction angle of rock matrix (Deg) | 46.7 | | Pore formation stress gradient (g/cm3) | 1.15 | Cohesion of shale bedding (MPa) | 4.7 | | Biot’s coefficient | 0.45 | Friction angle of shale bedding (Deg) | 26.9 | | Elastic modulus (GPa) | 22.0 | Poisson’s ratio | 0.21 |
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