Research Article
Real-Time Interpretation Model of Reservoir Characteristics While Underbalanced Drilling Based on UKF
Table 1
Basic parameters for well X.
| Parameters | Value | Parameters | Value |
| Well depth (m) | 3000 | Yield point (Pa) | 3.84 | Casing shoe depth (m) | 2200 | Surface temperature (°C) | 20 | Casing ID (mm) | 228.47 | Geothermal gradient (°C/m) | 0.0266 | Bit diameter (mm) | 215.9 | Casing pressure (MPa) | 1 | Drill pipe OD (mm) | 127 | Gas injection rate (Nm3/s) | 0.5 | Drill pipe ID (mm) | 108.6 | ROP (m/h) | 16 | Bit nozzle area (mm2) | 660 | Oil density (kg/m3) | 850 | Pump rate (L/s) | 30 | Oil viscosity (mPa·s) | 30 | Mud density (kg/m3) | 1180 | Compressibility of liquid (Pa-1) | | Consistency index (Pa·sn) | 0.37 | Reservoir porosity | 0.15 | Flow behavior index | 0.68 | Skin factor | 0.013 |
|
|