1) The document presents a hole cleaning optimisation model that can be used from the well design stage through drilling operations to prevent hole problems caused by poor hole cleaning. 2) The model estimates optimum parameters like inclination angle, drill string rotation, mud rheology, and flow rate to ensure cuttings are continuously transported with the drilling fluid. 3) The model also estimates the time required to circulate cuttings to the surface after reaching total depth based on material balance, annular pressure loss, and friction in the annulus. Further field testing is still needed to prove the model's utility.