Research Article
Simulation of Wellbore Stability during Underbalanced Drilling Operation
Table 2
Case study input data.
| Mechanical parameters | |
| Poisson ratio () | 0.2 | Bulk Young’s modulus () | 4.4 GPa | Maximum horizontal stress ( | 16.8 MPa (2436 psi) | Minimum horizontal stress | 14 MPa (2030 psi) | Wellbore pressure () | 6.89 MPa (1000 psi) | Hydraulic parameters | | Initial reservoir pressure () | 11.1 MPa (1610 psi) | Fluid bulk module () | 0.45 GPa | Fluid compressibility | 1.0 × 10−5 Pa−1 | Biot’s coefficient | 1.0 | Physical parameters | | Fluid viscosity | 3 × 10−4 Pa⋅s | Fluid density | 1111 kg/m3 | Matrix permeability | 9.869 × 10−18 m2 (0.01 md) | Porosity () | 0.1 | Wellbore radius | 0.15 m | Reservoir outer radius | 1000 m | Formation temperature | 375 | Drilling mud temperature ( | 330 | Thermal osmosis coefficient | 1 × 10−11 m2/s K | Thermal expansion coefficient of fluid | 3 × 10−4 1/K | Thermal diffusivity | 1.1 × 10−6 m2/s | Thermal expansion coefficient of solid | 1.8 × 10−5 1/K |
|
|