The cementing process is an important stage during the drilling process of an oil and gas well. During this process, the flow is displaced through an annular space. Non-uniform liquid displacement may lead to severe problems to the well structure and safety, therefore it is important to study its behavior. The liquids present in this process may be either in laminar or turbulent flow regime. For laminar flow regime, there are several works that study the bahavior of this kind of flow. On the other hand, for turbulent flow behavior there are not enough studies. The present work studied the influence of the turbulent flow in an annular well displacements. The complete solution of the tri-dimensional and transient flow is extremely computational expansive. Hence, the problem was simplified by applying the lubrication theory. In order to analyse the bahavior the cementing process two simulations were done. The first simulation concerns a vertical concentric well whereas the second simulation concerns a vertical excentric well. In both simulations the turbulent regime contributed in a positive way for the displacement. Even in the second simulation, in which is really hard to avoid the formation of the viscous fingering, the turbulent displacement were more stable. Besides, a friction factor for annular flow was defined as it is necessary in turbulent flows. Finally, a mathematical formulation was elaborated in cylindrical coordinates that is able to discribe both regime flows: laminar and turbulent.