Solubilidade de carbonato de ferro em misturas aquosas contendo monoetilenoglicol e cloreto de sódio a 25 e 50 °C
In the production of gas and oil, the appearance of gas hydrate, which is formed at low temperatures and high pressures, is capable of interrupting the flow in the pipelines, affecting the safety and production of the operations. Therefore, thermodynamic inhibitors such as monoethylene glycol (MEG)...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/50483 |
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| Resumo: | In the production of gas and oil, the appearance of gas hydrate, which is formed at low temperatures and high pressures, is capable of interrupting the flow in the pipelines, affecting the safety and production of the operations. Therefore, thermodynamic inhibitors such as monoethylene glycol (MEG) are used, inserted in the head of the wells in order to ensure the economy and operational viability of the system. However, monoethylene glycol can cause a decrease in salt solubility and lead to encrustation in the pipe when it comes into contact with ions in the formation water. Losses associated with crust events run into billions of dollars annually in the oil industry, so research on conditions favorable to precipitation and techniques to inhibit the formation of these deposits is a priority for oil and gas production. Thus, the objective of this work is to investigate the solubility conditions of iron carbonate (FeCO3) in an aqueous system with monoethylene glycol in the absence of carbon dioxide (CO2), containing sodium chloride (NaCl) in the mixture. Regarding the methodology, experiments were carried out using the analytical method to determine iron carbonate solubility data, varying the concentration of MEG from 0 to 100 %, the temperatures from 25 to 50 ºC, and the amount of sodium chloride from 0 to 100 %. 1 %. With that, it was notorious to observe that the increase of the amount of MEG in the system, leads to a decrease in the solubility of the iron carbonate, as well as the temperature variation, the higher, the less soluble the carbonate salt in the system. This scenario describes favorable conditions for crust deposition and therefore should not be favoured. However, when sodium chloride is added to the studied solution, it is noticed that there is a significant increase in solubility or a reduction in the amount of precipitation. Additionally, density was studied as a means to determine the amount of MEG in the system. The results collected in this work can be used to meet the needs of the oil and gas industry, acting in the suppression of incrustation formation and its consequences. |
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