Detalhes bibliográficos
| Ano de defesa: |
2016 |
| Autor(a) principal: |
Moraes, Martimiano Krusciel de
 |
| Orientador(a): |
Costa, Eleani Maria da
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| Banca de defesa: |
Não Informado pela instituição |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Pontifícia Universidade Católica do Rio Grande do Sul
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia e Tecnologia de Materiais
|
| Departamento: |
Faculdade de Engenharia
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://tede2.pucrs.br/tede2/handle/tede/7078
|
Resumo: |
Carbon capture and storage in geological formations is a promising technology to mitigate emissions of the main greenhouse gas, CO2. However, its application involves maintaining the integrity of the materials used in the injection wells to prevent leakage of CO2. On the other hand, advances in nanotechnology research have contributed to improve the performance of cementitious materials. In this context, this work investigate the influence of the incorporation of clay (organomodified montmorillonite- OMMT) and silica nanoparticles in the class G cement paste used in the completion and abandonment of oil wells in two reaction media, wet supercritical CO2 and water saturated with CO2, at high pressure (15 MPa) and high temperature (90 °C) for 7, 21 and 56 days. The techniques of field emission gun scanning electron microscopy (FEG/SEM), X ray diffraction (XRD), Vickers hardness and compressive strength were used to evaluate the effect of degradation on the structure and mechanical properties of the cement paste. In general, the inclusion of nanoparticles promoted an increase in chemically altered layer, with the exception of adding 0.5% OMMT, which can be an indication that there is an adequate amount of nanoparticles that can produce an increasing on the resistance to chemical degradation in the presence of CO2. However, in general, the results indicate an improvement on mechanical properties with the addition of nanoparticles, compared with the cement paste without addiction of nanoparticles. Among all types and concentrations of nanoparticles studied, the best results in terms of density and resistance to degradation by CO2 was obtained for the content of 0.5% OMMT. |
