TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn a drilling operation hole cleaning plays an important role. Improper hole cleaning can lead to problems like reduced penetration rate, torque and drag increase, and increase in pipe sticking potential. Cutting transport in a wellbore is a complex problem affected by several parameters such as mud density, cutting size and density, rate of penetration and mud circulation rate. Researchers conducted experiments with different setups representing annulus flow in a limited number of hole sizes to investigate the contribution of several physical and operating conditions. Due to time and cost involved in the construction and conduction of the experiments all reported studies are limited to physical model dimensions and operating parameters.