Youtube presentation: https://youtu.be/vDCeUQKEmZE

In order to extend the lifecycle of industrial assets and optimize the use of material, energy, economic and human resources, there is a proposal to establish geothermal power plants in abandoned oil wells. In this context, an analysis was made of the deployment of Organic Rankine Cycles (ORC) in four abandoned wells in Brazil. These study cases are located in the states of Mato Grosso, Paraná, Rio Grande do Norte and Santa Catarina and have vertical depths between 4102.8 m and 6053.5 m. The characteristics of the heat source that feeds the power cycle were taken from the results of thermal simulations of these wells available in previous works, which contains estimated data about the rate and conditions of hot fluid extracted from the well over 30 years of activity. The ORC was designed with a single stage turbine and no heat recovery. The ambient conditions were taken as constant and corresponding to the annual averages for the respective localities. This information was inputted to optimize the saturation pressure and temperature in the Evaporator for the design point, which resulted in nameplate electrical power between 10.7 and 13.7 kW. After defining the design point of each power plant, the mass flow of R245fa in the organic cycle was estimated, aiming at the maximum generation of electricity year by year. From this, a nonlinear regression was defined whose function defines the net electric power as a function of time, which obtained coefficients of determination greater than 0.9994. The integration of this generated function over time made it possible to estimate the net electricity produced annually. In addition, other outcomes of the power cycles were evaluated, for example the thermal efficiencies, which range from 3.46% to 5.33% for the nameplate condition.