Research Article
Flow Field and Pressure Loss Characteristics at Rotary Drillstring Joints
Table 1
The main CFD model parameters.
| | Parameters | Value | Parameters | Value |
| | Mixture type | Fluid-solid mixture | Solid content (%) | 15 | | Fluid density (g/cm3) | 1.5 | Fluid viscosity (mPa·s) | 25 | | Inner diameter of casing/borehole (mm) | 215.9 | Joint lower length (mm) | 500 | | Outer diameter of the joint (mm) | 146.1 | Inlet mean velocity (m/s) | 0.5, 1.0, 1.5, 2.0 | | Outer diameter of the drillstring (mm) | 101.6114.3127.0
139.7
168.3 | Drillstring eccentricity | 0 ~ 0.8 | | Joint upper length (mm) | 500 | Rotational rate (RPM) | 0, 30, 60, 90, 120 |
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