Predição da tensão interfacial de misturas através da equação de estado cubic plus association (CPA)
Among the thermophysical properties, the interfacial tension is directly involved in many phenomena and processes in the oil and gas industry, greatly influencing the extraction of these resources. The experimental determination of this property, in wide ranges of temperature and operating pressure,...
| Autor principal: | Bortolotto, Aline Brezolin |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2023
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/32167 |
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| Resumo: |
Among the thermophysical properties, the interfacial tension is directly involved in many phenomena and processes in the oil and gas industry, greatly influencing the extraction of these resources. The experimental determination of this property, in wide ranges of temperature and operating pressure, is complex and time-consuming, making it expensive. For this reason, and given the importance of oil as an energy source and raw material for countless products that are part of our daily life, several studies have been conducted with the objective of developing thermodynamic methodologies capable of determining such property, in order to design strategies for exploration of reservoirs, as well as improving oil recovery techniques. However, this task is not simple, since oil production does not involve only hydrocarbons, but a complex mixture that can contain water, salts and other impurities in its composition. Frequent phase changes caused by constant alterations in temperature and pressure conditions during the extraction process make this work even more difficult. In this context, recent advances have been made in terms of incorporating into the equations of state terms capable of including the contribution of polar (associative) compounds, such as water and alcohols, commonly found in petroleum. This is the case of the Cubic Plus Association – CPA equation of state. Given the above and in order to contribute to this field of study, this work employs the CPA equation of state associated with the modified Butler equation and the Lamperski model in order to determine the interfacial tension of eight binary mixtures formed by components commonly found in oil and gas industry. It was investigated non-associative systems containing in their composition methane, ethane, propane, n-butane, carbon dioxide and nitrogen, for temperature and pressure ranges of, approximately, 95 to 380 K and 0,1 to 8,5 MPa, respectively, and associative systems formed by water, ethanol, methane, hexane and benzene for temperature and pressure ranges of, approximately, 283 to 313 K and 0,1 to 47 MPa, respectively. The results obtained were compared with experimental data and values taken from the commercial software of thermophysical properties REFPROP®. In the end, it was possible to conclude that the implemented models captured the qualitative behavior of the evaluated property for most non-associative systems while its performance was good qualitatively and quantitatively for associative systems. The interfacial tension values of two non-associative mixtures were compared with those of REFPROP® demonstrating that, even with a quantitative deviation, the models generate better results than the software. The absolute mean errors were low for the systems studied, most of them being less than 2 mN/m and some less than 1 mN/m, which validates the proposed methodology and the applicability of CPA to model systems containing polar compounds. Based on the absolute mean errors, among the implemented models, the Lamperski model presented the best results. |
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