Injection wells have been used in enhanced oil recovery and carbon dioxide sequestration in petroleum industries for many decades. Pressure and temperature profiles of fluid flow in the injection well are two main parameters of interest for petroleum engineers to determine optimum injection conditions and wellbore completion design especially in thermal injection projects and deep wells. Although some sophisticated software packages are available for such purpose, but they suffer from slow running time, difficulty of model building skills for inexperienced users and assumptions used in those...