Research Article
Modelling of Formation Pore Pressure Inversion during Tight Reservoir Drilling
Table 1
Major parameter values used for simulation.
| | Items | Value | Items | Value |
| | Well depth (m) | 3000 | Displacement (m3/s) | 0.015 | | Open hole length (m) | 800 | Reservoir gas density (kg/m3) | 200 | | Bit diameter (in) | 8-1/2 | Reservoir gas viscosity (μPa∙s) | 26 | | Outer diameter of drill pipe (in) | 5 | Total compression factor (1/MPa) | 1.5 × 10-4 | | Initial underbalance pressure p0 (MPa) | 1.5 | Density of drilling fluid (kg/m3) | 1500 | | Permeability (md) | 100 | Surface tension (N/m) | 0.0173 | | ROP (m/h) | 10.8 | Roughness (m) | 0.0008 |
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