Research Article
Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
Table 1
Fluid and structure parameters.
| | | Parameter names | Value |
| | Structure parameter | Density (kg/m3) | 7850 | | Length (m) | 9 | | Outer diameter (mm) | 115 | | Wall thickness (mm) | 8 | | Elastic modulus (GPa) | 210 | | Poisson’s ratio | 0.3 |
| | Fluid parameter | Drilling fluid density (kg/m3) | 1200 | | Drilling fluid viscosity (Pa·s) | 0.001 | | Natural gas density (kg/m3) | 0.75 | | Natural gas viscosity (Pa·s) | 1.15 × 10−5 |
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