Research Article
DEM-CFD Modeling of Proppant Pillar Deformation and Stability during the Fracturing Fluid Flowback
Table 2
Summary of microscale properties of proppant.
| Proppant size combination | 40/70 | 30/50 | 20/40 |
| Microparameters | Linear contacts | Apparent modulus Ec (MPa) | 100 | Normal stiffness kn (N/m) | 2DEc | Shear stiffness ks (N/m) | k n | Parallel bonds | Apparent modulus Ec (MPa) | 100 | Normal stiffness kn (MPa/m) | E c/D | Shear stiffness ks (MPa/m) | k n | Normal bond strength (Pa) | 3000 | Shear bond strength (Pa) | 3000 | Radius multiplier | 1 | Friction | 0.9 | Density (kg/m3) | 2650 | Particle radius (D/2) (mm) | 0.21–0.42 | 0.3–0.6 | 0.42–0.84 |
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