Research Article
Numerical Simulation of Barite Sag in Pipe and Annular Flow
Table 2
Input for the simulation – 3D CFD model; dispersed phase modelled as Lagrangian phase.
| | Parameter | Variable | Value | Units |
| | Drill string length | | 1.8288 () | m (ft.) | | Pipe diameter | | 0.0508 () | m (inch) | | Hole diameter | | 0.1016 () | m (inch) | | Angle of inclination | θ | 0–90 | ° (degrees) | | Fluid inlet velocity | | 0.1524 ()–0.762 () | m/s (ft./min) | | Dynamic viscosity | | | | | Density of liquid | | 958.61 () | kg/m3 (ppg) | | Fluid behaviour index | | 0.44 | — | | Consistency index | | 0.63 (1.316) | Pa·s (lbfs/100 ft2) | | Drill pipe rotation speed | | 0–100 | rpm | | Eccentricity ratio | | 0, 1 | — | | Shape of particles | | spherical | | | Particle diameter | | 0.0000249 () | m (microns) | | Particle density (dry density) | | 4193.92 (35.0) | kg/m3 (ppg) | | Coefficient of restitution | | 1.0 | — | | Number of CFD cells | | 84,102 | | | CFD time-step | | 0.01 | s | | Physical time simulated | | 36 | s |
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