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Previous issue date: 2014-02-10 / The gas migration during the cementing of wells is one of the main problems of oil wells
engineering. Its occurrence can cause severe problems since shortly to loss of control of the well after
cementation. Recently, 20/04/2010 In an accident of major proportions in the Gulf of Mexico, among
other factors, faulty cementing operation provided the gas migration, causing the accident, in which 11
people died and 17 were injured occurred. Besides the serious consequences that can be caused by
gas migration, remediation of the problem, which is made by injecting cement in damaged areas,
usually involves additional costs and is not always effective. Therefore, preventing gas migration to be
preferred. Some methods are used to prevent the migration of the pressurized gas as the annular
space, application of pressure pulses, reducing the height of the cement column compressible cement
pastes of low permeability, pastes and to control free filtered water, and binders of thixotropic cement
expandable and flexible. Thus, the cement pastes used to prevent gas migration must meet the
maximum these methods. Thus, this study aimed to formulate a cement paste to prevent gas
migration, using the expanded vermiculite, and evaluate the behavior of the folder trials necessary for
use in oil wells. Free water content, rheological properties, compressive strength, loss of liquid phase
sedimentation of solids, specific weight, thickening time and gas migration: The following tests were
performed. The results show that meets the specifications paste formulated for use in oil wells and the
use of expanded vermiculite contribute to the absorption of free water, thixotropy and low density. The
absorption of free water is proven to result in zero percentage test free water content, thixotropy is
observed with the high value of the initial gel strength (Gi) in testing rheological properties and low
density is proven in test weight specific / A migra??o de g?s durante a cimenta??o de po?os ? um dos principais problemas da
engenharia de po?os de petr?leo. Sua ocorr?ncia pode causar desde problemas pouco severos at? a
perda de controle do po?o ap?s a cimenta??o. Recentemente, Em 20/04/2010 ocorreu um acidente
de grandes propor??es no Golfo do M?xico, que dentre v?rios fatores, a falha na opera??o de
cimenta??o proporcionou a migra??o de g?s, causando o acidente, onde 11 pessoas morreram e 17
ficaram feridas. Al?m das s?rias consequ?ncias que podem ser causadas pela migra??o de g?s, a
remedia??o do problema, que ? feita pela inje??o de cimento nas zonas danificadas, geralmente
envolve custos adicionais e nem sempre ? efetiva. Por isso, a preven??o da migra??o de g?s deve
ser preferida. Alguns m?todos s?o utilizados para evitar a migra??o de g?s como a pressuriza??o do
espa?o anular, aplica??o de pulsos de press?o, redu??o da altura da coluna de cimento, cimento
compress?vel, pastas de baixa permeabilidade, pastas com controle de filtrado e ?gua livre, e pastas
de cimento tixotr?picas, expans?veis e flex?veis. Deste modo, as pastas de cimento utilizadas para
evitar migra??o de g?s devem atender ao m?ximo estes m?todos. Assim, este trabalho teve como
objetivo formular uma pasta de cimento para evitar a migra??o de g?s, utilizando a vermiculita
expandida, e avaliar o comportamento da pasta em ensaios necess?rios ? utiliza??o em po?os
petrol?feros. Foram realizados os seguintes ensaios: teor de ?gua livre, propriedades reol?gicas,
resist?ncia a compress?o, perda da fase liquida, sedimenta??o dos s?lidos, peso especifico, tempo
de espessamento e migra??o de g?s. Os resultados mostram que a pasta formulada atende as
especifica??es para utiliza??o em po?os de petrol?feros e que a utiliza??o da vermiculita expandida
contribuiu para a absor??o da ?gua livre, tixotropia e baixa densidade. A absor??o da ?gua livre ?
comprovada com o resultado de porcentagem zero no ensaio de teor de ?gua livre, a tixotropia ?
verificada com o alto valor da for?a gel inicial (Gi) no ensaio de propriedades reol?gicas e a baixa
densidade ? comprovada no ensaio de peso especifico
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12855 |
| Date | 10 February 2014 |
| Creators | Nunes, Eduardo Raimundo Dias |
| Contributors | CPF:04514998320, http://lattes.cnpq.br/5840621182000517, Barbosa, Carina Gabriela de Melo e Melo, CPF:06575109470, http://lattes.cnpq.br/5498205324577221, Motta, Fabiana Villela da, CPF:24779953839, http://lattes.cnpq.br/9918299069511517, Barros, Joana Maria de Farias, CPF:85239658404, http://lattes.cnpq.br/1016070459137884, Melo, Marcus Ant?nio de Freitas |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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