In this work an analysis is conducted based on the fluid dynamics effects caused by flows over different types of geometries inside a pipe for application in a robotic vehicle. Conical, elliptical and parabolic profiles are considered in the simulations performed in Ansys Fluent. The analysis verifies the feasibility of installing a variable geometry system in an autonomous robot for oil and shale gas well inspection. The turbulence model k-e with standard wall functions is validated for the dynamics of the problem through simulations based on reproduction of parameters used in a similar experiment. The results are compared based on available empirical data, as well as on results obtained by a mathematical model. Simulations are performed for two-dimensional and three-dimensional axisymmetric flows under steady state condition to obtain the solutions related to the variable geometry system. Also, a mesh independece test is conducted to validate the range of y(plus) values obtained through simulations for different meshes and Reynolds numbers. Based on the results, a prototype of the variable geometry system is designed in Solidworks. It is verified that the installation of the proposed system reduces the robot s energy consumption.