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 |
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