The oil exploration industry has been increasing more each year. The trade of fossil fuel-based and derivatives has proved to be a large financial profitability area across the years. Involving great private and state companies acting around the world. For being a process extremely complex, associated to a incontables risks that can foward to immeasurable financial and environment losses, the oil exploration industry has been having your processes studied and improved since your creation. Investments and incentives come from great companies on research centers and universities, looking for development and improvement of new and tradicional methods happen often. Dealing with a high requisition area, this project has the focos on the oil well cementation phase. Specifically, it is being studied a process before the pumping of the cement paste inside the oil well. The objective is analyze the displacement of drilling fluids by the pumping of spacer fluids to prepare the enviroment to receive the cement paste.