Research Article
Cutting Migration and Core Disturbance Caused by the Hydraulic Structure of Pressure- and Gas-Maintaining Coring Bits
Table 1
Numerical simulation calculation parameters.
| | Numerical simulation conditions | Model | Parameter |
| | Turbulence model | Eulerian | / | | Maximum number of particle tracking steps | / | 50000 | | Residual | / | 1-5 | | DPM physical models | Saffman force, virtual mass force, pressure gradient force | | | Flow field outlet conditions | Pressure-outlet | 3.5 Mpa | | Bit speed | SRF | 120 r/min | | Inlet conditions of flow field | Mass-flow-inlet | 5 L/s | | Drilling fluid density | / | 1300 kg/m3 | | Viscosity of drilling fluid | / | 0.03 kg/m-s | | Debris particles | DDPM | Diameter: 0.6 mm
Density: 1400 kg/m3 |
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