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Previous issue date: 2015-10-19 / A recupera??o avan?ada de petr?leo tem sido foco de in?meras pesquisas buscando o melhoramento da recupera??o do ?leo in place dos reservat?rios, isto porque os reservat?rios maduros e/ou aqueles que possuem ?leos muito viscosos precisam de meios que auxiliem no escoamento e conseq?ente produ??o. Diante disto, foram estudadas as propriedades f?sico-qu?micas, entre estas propriedades verificaram-se o comportamento reol?gico e a tens?o superficial dos pol?meros, variando a concentra??o e a temperatura. Ap?s a obten??o da concentra??o de overlep, foi analisada a tens?o interfacial da solu??o de petr?leo/poliacrilamidas e, estas em presen?a de tensoativo e EDTA. Tamb?m, observou-se a permeabilidade destas solu??es, modificando a concentra??o. Com isso, o objetivo desta caracteriza??o foi observar a viabilidade destas solu??es nos processos de deslocamento de petr?leo em meio poroso. Os resultados obtidos mostraram que o aumento da ionicidade das poliacrilamidas promove um aumento da viscosidade no meio. No caso da temperatura seu aumento reduz a viscosidade para as poliacrilamidas de baixa ionicidade, a aumenta a viscosidade das poliacrilamidadas de alta ionicidade. Quanto a permeabilidade, verificou-se que os pol?meros ani?nicos apresentaram press?es mais elevadas em compara??o aos pol?meros de baixa ionicidade, e acredita-se que esse comportamento esteja relacionado ?s viscosidades destes pol?meros, que s?o mais altas. Na tens?o superficial observou-se a regi?o da concentra??o de overlep de cada pol?mero, consequentemente foi observado que as cargas i?nicas n?o influenciaram consideravelmente na redu??o das tens?es interfaciais entre o ?leo e as poliacrilamidas e constataram-se redu??es das IFT de todas as solu??es estudadas quando comparada ao caso ?gua/petr?leo. Tal resultado ? um bom ind?cio para seu uso no processo de recupera??o avan?ada de petr?leo. Finalmente, ao injetar as solu??es estudadas no meio poroso, verificou-se que as solu??es de pol?meros com maior ionicidade em presen?a de tensoativo e EDTA promoveram uma sinergia na recupera??o avan?ada de petr?leo, quando comparadas ?s solu??es contendo apenas pol?meros. / Enhanced oil recovery has been the focus of countless research projects
aiming for the improvement of the in place oil recovery from the reservoirs, especially
because mature fields and/or fields containing heavy oil require further assistance to
ensure oil flow and consequent production. Having that in mind, physical and chemical
properties such as the rheological behaviour and the superficial tension of polymers, for
different concentrations and temperatures, were studied. After obtaining the polymers
critical aggregation concentration (c.a.c.), the interfacial tension (IFT) between the
polyacrylamide/oil solutions was evaluated, as well as for the solutions containing
surfactant (SB) and EDTA. The permeability and the application of those solutions in
enhanced oil recovery of those solutions was also observed using the Botucatu arenite.
The results obtained demonstrated that the increase in the polymers ionicity promotes an
increase in the solution viscosity. An increase in temperature reduced the viscosity for the
low ionicity polyacrylamides, but caused an increase in the viscosity for some of the high
ionicity ones. Concerning permeability, the anionic polymers presented higher injection
pressure values when compared to the lower ionicity ones, and that behaviour is believed
to be related to the viscosities of those polymers, which are higher. Regarding superficial
tension, the c.a.c. region for each polymer was observed, and the conclusion was that the
ionic charges had little or no influence in the reduction of interfacial tensions between the
oil and the polymers, while the decrease in IFT for all solutions was observed when
compared to the system formed by water and oil. The aforementioned results are a good
indicator that the polymers studied are suitable for the enhanced oil recovery process. By
injecting the solutions into the porous media, it was observed that the solutions formed by
SB associated to EDTA improved the flow inside the porous media. The results indicated
that the enhanced oil recovery using the polymer/ surfactant/ EDTA solutions reached a
recovery factor of 18 % of the original oil. In addition, it could be observed that polymers
presenting the higher ionicity, associated to surfactant and EDTA, promoted a synergy in
the enhanced oil recovery when compared to the solutions containing only polymers.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20567 |
| Date | 19 October 2015 |
| Creators | Santos, Joselisse Soares de Carvalho |
| Contributors | 11721456368, http://lattes.cnpq.br/6784689928387553, Curbelo, Fabiola Dias da Silva, 87599651420, http://lattes.cnpq.br/6991333478380004, Santos, Francisco Klebson Gomes dos, 00779263405, http://lattes.cnpq.br/0273000754120553, Oliveira, Humberto Neves Maia de, 22179763468, http://lattes.cnpq.br/7302633941782540, Melo, Ricardo Paulo Fonseca, 00000000000, http://lattes.cnpq.br/2188795979320167, Barros Neto, Eduardo Lins de, Duarte, M?rcia Maria Lima |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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