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Previous issue date: 2014-11-13 / A distribui??o e mobiliza??o ou n?o dos fluidos num meio poroso dependem das for?as
capilar, viscosa e gravitacional. Em campo, os processos de recupera??o avan?ada de ?leo
envolvem a import?ncia e a altera??o destas for?as para incrementar o fator de recupera??o de
?leo. No caso do processo de drenagem gravitacional assistida por g?s (GAGD ? GasAssisted
Gravity Drainage) ? importante entender a f?sica e mecanismos que mobilizam o
?leo atrav?s da intera??o destas for?as. Para isso, v?rios autores desenvolveram modelos
f?sicos em escala de laborat?rio e testemunhos do GAGD para estudar o desempenho destas
for?as atrav?s de grupos adimensionais. Estes modelos apresentaram resultados conclusivos.
Por?m, modelos de simula??o num?rica foram pouco usados. O objetivo deste trabalho ?
estudar a inter-rela??o das for?as capilar, viscosa e gravitacional no GAGD e suas influ?ncias
no fator de recupera??o de ?leo atrav?s de um modelo de simula??o num?rica 2D. Para
analisar cada uma dessas for?as, foram usados os grupos adimensionais reportados na
literatura, N?mero Capilar (Nc), N?mero de Bond (Nb) e N?mero Gravitacional (Ng). Uma
compara??o dos resultados obtidos neste trabalho tamb?m foi realizada com os resultados da
literatura. Os resultados mostraram que antes da erup??o do g?s injetado, quanto menor ? o
Nc e Nb, maior ? a recupera??o de ?leo, e ap?s da erup??o, quanto menor ? o Ng, maior ? a
recupera??o de ?leo no GAGD. Uma boa rela??o foi encontrada entre os resultados deste
trabalho e os resultados publicados na literatura / The distribution and mobilization of fluid in a porous medium depend on the capillary,
gravity, and viscous forces. In oil field, the processes of enhanced oil recovery involve change
and importance of these forces to increase the oil recovery factor. In the case of gas assisted
gravity drainage (GAGD) process is important to understand the physical mechanisms to
mobilize oil through the interaction of these forces. For this reason, several authors have
developed physical models in laboratory and core floods of GAGD to study the performance
of these forces through dimensionless groups. These models showed conclusive results.
However, numerical simulation models have not been used for this type of study. Therefore,
the objective of this work is to study the performance of capillary, viscous and gravity forces
on GAGD process and its influence on the oil recovery factor through a 2D numerical
simulation model. To analyze the interplay of these forces, dimensionless groups reported in
the literature have been used such as Capillary Number (Nc), Bond number (Nb) and Gravity
Number (Ng). This was done to determine the effectiveness of each force related to the other
one. A comparison of the results obtained from the numerical simulation was also carried out
with the results reported in the literature. The results showed that before breakthrough time,
the lower is the injection flow rate, oil recovery is increased by capillary force, and after
breakthrough time, the higher is the injection flow rate, oil recovery is increased by gravity
force. A good relationship was found between the results obtained in this research with those
published in the literature. The simulation results indicated that before the gas breakthrough,
higher oil recoveries were obtained at lower Nc and Nb and, after the gas breakthrough,
higher oil recoveries were obtained at lower Ng. The numerical models are consistent with the
reported results in the literature
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19555 |
| Date | 13 November 2014 |
| Creators | Bautista, Ernesto Vargas |
| Contributors | 09453210404, http://lattes.cnpq.br/0288842238100161, Junior, Abel Gomes Lins, 14334968449, http://lattes.cnpq.br/1051102659037756, Medeiros, Ana Catarina da Rocha, 67215793400, http://lattes.cnpq.br/8013591667991638, Dutra J?nior, Tarc?lio Viana, 09599576420, http://lattes.cnpq.br/8753782475740001, Barillas, Jennys Lourdes Meneses, Mata, Wilson da |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE PETR?LEO, 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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