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Previous issue date: 2013-07-29 / Nearly 3 x 1011 m3 of medium and light oils will remain in reservoirs worldwide after
conventional recovery methods have been exhausted and much of this volume would be
recovered by Enhanced Oil Recovery (EOR) methods. The in-situ combustion (ISC) is an
EOR method in which an oxygen-containing gas is injected into a reservoir where it reacts
with the crude oil to create a high-temperature combustion front that is propagated through
the reservoir. The High Pressure Air Injection (HPAI) method is a particular denomination of
the air injection process applied in light oil reservoirs, for which the combustion reactions are
dominant between 150 and 300?C and the generation of flue gas is the main factor to the oil
displacement. A simulation model of a homogeneous reservoir was built to study, which was
initially undergone to primary production, for 3 years, next by a waterflooding process for 21
more years. At this point, with the mature condition established into the reservoir, three
variations of this model were selected, according to the recovery factors (RF) reached, for
study the in-situ combustion (HPAI) technique. Next to this, a sensitivity analysis on the RF
of characteristic operational parameters of the method was carried out: air injection rate per
well, oxygen concentration into the injected gas, patterns of air injection and wells
perforations configuration. This analysis, for 10 more years of production time, was
performed with assistance of the central composite design. The reservoir behavior and the
impacts of chemical reactions parameters and of reservoir particularities on the RF were also
evaluated. An economic analysis and a study to maximize the RF of the process were also
carried out. The simulation runs were performed in the simulator of thermal processes in
reservoirs STARS (Steam, Thermal, and Advanced Processes Reservoir Simulator) from
CMG (Computer Modelling Group). The results showed the incremental RF were small and
the net present value (NPV) is affected by high initial investments to compress the air. It was
noticed that the adoption of high oxygen concentration into the injected gas and of the five
spot pattern tends to improve the RF, and the wells perforations configuration has more
influence with the increase of the oil thickness. Simulated cases relating to the reservoir
particularities showed that smaller residual oil saturations to gas lead to greater RF and the
presence of heterogeneities results in important variations on the RF and on the production
curves / Aproximadamente 3 x 1011 m3 de ?leos m?dios e leves restar?o nos reservat?rios ao redor do
mundo ap?s a aplica??o dos m?todos convencionais de recupera??o e grande parte desse
volume seria recuper?vel com o uso de m?todos especiais. A combust?o in-situ (CIS) ? um
m?todo de recupera??o avan?ada de petr?leo no qual um g?s que cont?m oxig?nio ? injetado
no reservat?rio onde reage com o ?leo cru para criar uma frente de combust?o de alta
temperatura que se propaga pelo reservat?rio. O m?todo HPAI (High Pressure Air Injection)
? uma denomina??o particular do processo de inje??o de ar aplicado em reservat?rios de ?leos
leves, onde as rea??es de combust?o s?o dominantes entre 150 e 300?C e a gera??o de flue
gas ? o principal fator de deslocamento do ?leo. Um modelo de simula??o de fluxo de um
reservat?rio homog?neo foi constru?do para o estudo, o qual foi inicialmente submetido ?
produ??o prim?ria, por 3 anos, e em seguida, ao processo de inje??o de ?gua por mais 21
anos. Nesse ponto, com a condi??o madura estabelecida no reservat?rio, foram selecionadas
tr?s varia??es desse modelo, de acordo com o fator de recupera??o (FR) obtido, para o estudo
da t?cnica de combust?o in-situ (HPAI). Em seguida realizou-se uma an?lise de sensibilidade
sobre o FR de par?metros operacionais pr?prios do m?todo: vaz?o de inje??o de ar por po?o,
concentra??o de oxig?nio no g?s injetado, esquema de inje??o de ar e configura??o dos
canhoneados dos po?os. Essa an?lise, para um per?odo adicional de at? 10 anos produ??o, foi
efetuada com o aux?lio da t?cnica de planejamento composto central. O comportamento do
reservat?rio e os impactos de par?metros envolvendo as rea??es qu?micas e de
particularidades de reservat?rio sobre o FR tamb?m foram avaliados. Adicionalmente foram
elaborados uma an?lise econ?mica e um estudo de maximiza??o do FR do processo. As
simula??es foram realizadas com o simulador de processos t?rmicos em reservat?rios STARS
(Steam, Thermal and Advanced Process Reservoir Simulation) da CMG (Computer Modelling
Group). Os resultados mostraram que os FR incrementais foram baixos e que o valor presente
l?quido (VPL) ? impactado negativamente pelos elevados investimentos iniciais para
compress?o do ar. Observou-se que a ado??o de maiores concentra??es de oxig?nio no g?s
injetado e do esquema de inje??o de ar tipo five spot tende a favorecer o FR, e que a
configura??o dos canhoneados dos po?os apresenta influ?ncia crescente com o aumento da
espessura porosa com ?leo do reservat?rio. Casos simulados referentes ?s particularidades de
reservat?rio indicaram que menores satura??es residuais de ?leo ao g?s levam a FR maiores e
que a exist?ncia de heterogeneidades resulta em varia??es consider?veis nos FR e nas curvas
de produ??o
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12989 |
| Date | 29 July 2013 |
| Creators | Catonho, Humberto Sampaio |
| Contributors | CPF:09599576420, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4706483T3, Lins J?nior, Abel Gomes, CPF:14334968449, http://lattes.cnpq.br/1051102659037756, Barillas, Jennys Lourdes Meneses, CPF:00946709947, http://lattes.cnpq.br/4637897380055777, Rodrigues, Marcos Allyson Felipe, CPF:04575614408, http://lattes.cnpq.br/5453593230706116, 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/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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