A problem present in the production of oil and natural gas is the formation of gas hydrates, this compound is formed in the presence of water and light hydrocarbons at low temperatures and high pressures. To avoid the formation of hydrates, inhibitors are used, such as monoethylene glycol (MEG), which later needs to be regenerated to be reintroduced into the process. The presence of this inhibitor, in addition to other process factors, causes the precipitation of salts present in the produced water, causing incrustations in the pipes and the interruption of the process. The most common salt in incrustations is calcium carbonate (CaCO3), because this salt has a low solubility in water, its abundant in well conditions and increases their solubility in the presence of carbon dioxide (CO2), which is present in large quantities under well conditions. Another salt, also very present, is sodium chloride (NaCl) which, according to the literature, directly influences the solubility of calcium carbonate, the presence of sodium chloride in a concentration of approximately 2.5 mol/kg increases considerably the solubility of the carbonate. With this in mind, this work aims to study the behavior of the water, calcium carbonate, sodium chloride and monoethylene glycol system in the presence and absence of carbon dioxide, using the modified Othmer ebulliometer. For accomplish this, a study was carried out to define an equation for calculating the solubility of calcium carbonate in water, which was compared to literature data, then an analysis of previously data obtained by the research group of the system H2O+CaCO3+CO2 at 278,15 K, 283,15 K and 298,15 K and the system H2O+CaCO3+CO2+MEG at 298,15 K, was carried out, both varying the CO2 pressure, and in the second varying the mass percentage of monoethylene glycol. Before starting the experiments, the equipment was calibrated and adjusted. Equilibrium tests were carried out to determine solubility data in the modified Othmer ebulliometer for the H2O+NaCl, H2O+CO2 and H2O+CaCO3+CO2 systems, for the first system, tests were carried out at different pressures and concentrations until salt saturation , for the second system the test was carried out at pressure close to atmospheric with constant flow of CO2, and finally, for the third system the test was also carried out at pressure close to atmospheric, under saturation of salt and with constant flow of CO2. Although adjustments are still necessary, the defined equation showed agreement with literature data, requiring the development of the average ionic activity coefficient for a better adjustment. In relation to the data previously obtained by the research group, they are in agreement with the literature and with the expected behavior for the systems studied. The calibration brought the validation of the methodologies used, and the adjustment of the equipment. The equilibrium tests of the H2O+NaCl system showed agreement with the literature, in addition to determining that the data taken as equilibrium are those of the liquid phase. Finally, the equilibrium tests of the H2O+CO2 and H2O+CaCO3+CO2 systems are not yet conclusive as to the percentage of dissolved CO2, but it was seen that the gas dissolves better in the vapor phase, as it has a lower temperature, and that in the saturated system of CaCO3, solubilities of 58.60 ppm and 71.50 ppm were obtained, respectively for ebulliometers 1 and 2.