A unified transient solid-liquid two-phase flow model for cuttings transport- modelling part

The model is validated by conducting a series of experimental tests on a full scale flow loop (0.2 × 0.11 × 25 m). The validation of the transient simulation includes the validation of the transient build-up stage and the validation of the cuttings volumetric concentration at fully developed stage. Results found that increase of the flow rate significantly reduces the build-up time, and effects of pipe rotation vary at different inclined angles. The effect of inclination angle on solids profile build-up is similar to the effects of well inclination angle on steady state cuttings concentration. Below 60°, the build-up time increases significantly as the well inclination angle increases. When the well inclination angle goes to over 60°, the effects of well inclination angle become insignificant.