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Previous issue date: 2012-09-03 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / A significant fraction of the hydrocarbon reserves in the world is formed by
heavy oils. From the thermal methods used to recovery these resources, Steamflooding
has been one of the main economically viable alternatives. In Brazil, this technology is
widely used by Petrobras in Northeast fields. Latent heat carried by steam heats the oil
in the reservoir, reducing its viscosity and facilitating the production. In the last years,
an alternative more and more used by the oil industry to increase the efficiency of this
mechanism has been the addition of solvents. When co-injected with steam, the
vaporized solvent condenses in the cooler regions of the reservoir and mixes with the
oil, creating a low viscosity zone between the steam and the heavy oil. The mobility of
the displaced fluid is then improved, resulting in an increase of oil recovery. To better
understand this improved oil recovery method and investigate its applicability in
reservoirs with properties similar to those found in Potiguar Basin, a numerical study
was done to analyze the influence of some operational parameters (steam injection
rate, injected solvent volume and solvent type) on oil recovery. Simulations were
performed in STARS ("Steam, Thermal, and Advanced Processes Reservoir
Simulator"), a CMG ("Computer Modelling Group") program, version 2009.10. It was
found that solvents addition to the injected steam not only anticipated the heated oil
bank arrival to the producer well, but also increased the oil recovery. Lower cold water
equivalent volumes were required to achieve the same oil recoveries from the models
that injected only steam. Furthermore, much of the injected solvent was produced with
the oil from the reservoir / Uma por??o significativa das reservas de hidrocarbonetos atualmente
existentes no mundo ? formada por ?leos pesados. Dentre os m?todos t?rmicos
utilizados para a recupera??o desse tipo de recurso, a Inje??o Cont?nua de Vapor tem
se constitu?do como uma das principais alternativas economicamente vi?veis. No
Brasil, essa tecnologia ? largamente utilizada pela Petrobras em campos localizados na
regi?o Nordeste. O calor latente transportado pelo vapor aquece o ?leo do reservat?rio,
reduzindo sua viscosidade e facilitando a produ??o. Nos ?ltimos anos, uma alternativa
cada vez mais utilizada pela ind?stria para aumentar a efici?ncia desse mecanismo tem
sido a adi??o de solventes. Quando coinjetado com o vapor, o solvente vaporizado se
condensa nas regi?es menos aquecidas do reservat?rio e mistura-se ao ?leo, criando
uma zona de baixa viscosidade entre o vapor e o ?leo pesado. A mobilidade do fluido
deslocado ? ent?o melhorada, implicando num aumento da fra??o recuperada. Para
melhor compreender esse mecanismo de recupera??o avan?ada e investigar a sua
aplicabilidade em reservat?rios com caracter?sticas semelhantes aos encontrados na
Bacia Potiguar, foi realizado um estudo num?rico, onde se verificou a influ?ncia de
alguns par?metros operacionais (vaz?o de inje??o de vapor, volume de solvente
injetado e tipo de solvente) sobre a recupera??o de ?leo. As simula??es foram
realizadas no m?dulo STARS ( Steam, Thermal, and Advanced Processes Reservoir
Simulator ) do programa da CMG ( Computer Modelling Group ), vers?o 2009.10.
Verificou-se que a adi??o de solventes ao vapor injetado n?o s? antecipou a chegada
do banco de ?leo aquecido ao po?o produtor como tamb?m incrementou a recupera??o
de ?leo. Menores volumes de ?gua fria equivalente foram requeridos para se obter as
mesmas fra??es recuperadas dos modelos que s? injetaram vapor. Al?m disso, boa
parte do solvente injetado foi produzido juntamente com o ?leo do reservat?rio
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/13020 |
| Date | 03 September 2012 |
| Creators | Galv?o, Edney Rafael Viana Pinheiro |
| Contributors | CPF:09599576420, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4706483T3, Lins J?nior, Abel Gomes, CPF:14334968449, http://lattes.cnpq.br/1051102659037756, Lima, Ant?nio Gilson Barbosa de, CPF:43667660430, http://lattes.cnpq.br/4527387699298544, Santanna, Vanessa Cristina, CPF:77938780430, http://lattes.cnpq.br/9445575768909084, Dutra J?nior, Tarcilio Viana |
| 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/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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