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Previous issue date: 2010-03-05 / Petr?leo Brasileiro SA - PETROBRAS / Steam injection is the most used thermal recovery method of oil nowadays because of the high degree of development of the technique that allows high recovery factors. However,
injection of superheated steam into the reservoir affects the entire structure of the well, including the cemented layer that presents a retrogression of compressive strength and increases the permeability due to formation of more crystalline and denser phases at temperatures above 110 ?C. These changes result in failures in the cement that favor the
entrance of formation fluids into the annulus space resulting in unsafe operations and restrictions in the economic life of the well. But the strength retrogression can be prevented
by partial replacement of cement by silica-based materials that reduce the CaO/SiO2 ratio of cement slurries changing the trajectory of the reactions, converting those deleterious phases in phases with satisfactory mechanical strength and permeability. The aim of this study was to evaluate the behavior of a ceramic waste material rich in silica in partial and total substitution of a mineral additive used to fight the strength retrogression of cement slurries subjected to
high temperatures. The evaluation was made by compression, X-ray diffraction (XRD) and thermogravimetry (TG/DTG). The samples were submitted to a cycle of low temperature (38
?C) for 28 days and a cycle of low temperature followed by exposure to 280 ?C and 1000 psi by 3 days. The results showed that slurries with additions of up to 30% of the waste material are not enough to prevent the strength retrogression, while slurries with additions of the waste
material combined with silica flour in various proportions produced hydrated products of low Ca/Si ratios that maintained the compressive strength at satisfactory levels / A inje??o de vapor ? o m?todo t?rmico de recupera??o de ?leo mais utilizado atualmente em virtude do alto grau de desenvolvimento da t?cnica que permite elevados fatores de
recupera??o. No entanto, inje??o de vapor superaquecido no reservat?rio faz com que toda estrutura do po?o seja afetada pela alta temperatura, inclusive a camada cimentada, que
apresenta uma retrogress?o da resist?ncia ? compress?o e um aumento da permeabilidade devido ? forma??o de fases mais cristalinas e mais densas sob temperaturas superiores a 110 ?C. Essas altera??es d?o origem a falhas no cimento que propiciam a entrada de fluidos da forma??o para o espa?o anular, resultando em uma opera??o insegura e limita??es na vida econ?mica do po?o. Por?m, a retrogress?o da resist?ncia pode ser evitada atrav?s da substitui??o parcial do cimento por materiais a base s?lica, os quais reduzem a raz?o CaO/SiO2 das pastas de cimento, modificando, assim, a trajet?ria das rea??es, transformando aquelas fases delet?rias em fases com resist?ncia mec?nica e permeabilidade satisfat?rias. O objetivo desse estudo foi avaliar o comportamento de um res?duo cer?mico rico em s?lica em
substitui??o parcial e total de um aditivo mineral de uso consagrado no combate a retrogress?o da resist?ncia de pastas de cimento submetidos a altas temperaturas. A avalia??o se deu atrav?s de ensaios de resist?ncia ? compress?o, t?cnicas de difra??o de raios X (DRX)
e termogravimetria (TG/DTG) das pastas submetidas a um ciclo de baixa temperatura (38 ?C) por 28 dias e, tamb?m, um ciclo de baixa temperatura seguido de cura a 280 ?C e 1000 psi por 3 dias. Os resultados mostraram que pastas contendo adi??es de at? 30% do res?duo n?o foram suficientes para evitar a retrogress?o da resist?ncia, enquanto pastas contendo adi??es do res?duo de maneira combinada com a s?lica flour formaram produtos hidratados de baixa rela??o Ca/Si que fizeram com que a resist?ncia se mantivesse em n?veis satisfat?rios
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12921 |
| Date | 05 March 2010 |
| Creators | Souza, Pablo Diego Pinheiro de |
| Contributors | CPF:06117988320, http://lattes.cnpq.br/3318871716111536, Melo, Marcus Ant?nio de Freitas, CPF:04514998320, http://lattes.cnpq.br/5840621182000517, Anjos, Marcos Alyssandro Soares dos, CPF:02262184496, http://lattes.cnpq.br/3904325866154130, Melo, Dulce Maria de Ara?jo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia do Petr?leo, UFRN, BR, Pesquisa e Desenvolvimento em Ci?ncia e Engenharia de Petr?leo |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| 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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