Spelling suggestions: "subject:"cistemas multicomponente"" "subject:"cistemas multicomponent""
1 |
Estudo das for?as capilar, viscosa e gravitacional atrav?s de grupos adimensionais na simula??o da drenagem gravitacional assistida por g?s (GAGD)Bautista, Ernesto Vargas 13 November 2014 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-04T22:04:54Z
No. of bitstreams: 1
ErnestoVargasBautista_TESE.pdf: 4056194 bytes, checksum: 4254be419758b8c4d81ac80a522fc9b3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-07T21:31:17Z (GMT) No. of bitstreams: 1
ErnestoVargasBautista_TESE.pdf: 4056194 bytes, checksum: 4254be419758b8c4d81ac80a522fc9b3 (MD5) / Made available in DSpace on 2016-01-07T21:31:17Z (GMT). No. of bitstreams: 1
ErnestoVargasBautista_TESE.pdf: 4056194 bytes, checksum: 4254be419758b8c4d81ac80a522fc9b3 (MD5)
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
|
2 |
An?lise param?trica da simula??o composicional do processo de Drenagem Gravitacional Assistida por G?s (GAGD)Bautista, Ernesto Vargas 26 February 2010 (has links)
Made available in DSpace on 2014-12-17T14:08:38Z (GMT). No. of bitstreams: 1
Ernesto Vargas Bautista_DISSERT_01_59.pdf: 4396872 bytes, checksum: 70a69eb1e9973135d541fd7ce76f4ed9 (MD5)
Previous issue date: 2010-02-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In Brazil and around the world, oil companies are looking for, and expected development of new technologies and processes that can increase the oil recovery factor in mature reservoirs,
in a simple and inexpensive way. So, the latest research has developed a new process called Gas Assisted Gravity Drainage (GAGD) which was classified as a gas injection IOR. The
process, which is undergoing pilot testing in the field, is being extensively studied through physical scale models and core-floods laboratory, due to high oil recoveries in relation to
other gas injection IOR. This process consists of injecting gas at the top of a reservoir through horizontal or vertical injector wells and displacing the oil, taking advantage of natural gravity
segregation of fluids, to a horizontal producer well placed at the bottom of the reservoir. To study this process it was modeled a homogeneous reservoir and a model of multi-component
fluid with characteristics similar to light oil Brazilian fields through a compositional simulator, to optimize the operational parameters. The model of the process was simulated in
GEM (CMG, 2009.10). The operational parameters studied were the gas injection rate, the type of gas injection, the location of the injector and production well. We also studied the
presence of water drive in the process. The results showed that the maximum vertical spacing between the two wells, caused the maximum recovery of oil in GAGD. Also, it was found that the largest flow injection, it obtained the largest recovery factors. This parameter controls the speed of the front of the gas injected and determined if the gravitational force dominates or not the process in the recovery of oil. Natural gas had better performance than CO2 and that the presence of aquifer in the reservoir was less influential in the process. In economic
analysis found that by injecting natural gas is obtained more economically beneficial than CO2 / No Brasil e no mundo, as empresas de petr?leo est?o ? procura, desenvolvimento e ? espera de novas tecnologias e processos que possam elevar o fator de recupera??o de ?leo em seus
reservat?rios, com um equilibrado custo-benef?cio. Na procura de novas tecnologias foi desenvolvido o processo de drenagem gravitacional assistida por g?s (GAGD Gas Assisted Gravity Drainage) que foi classificado dentro dos m?todos de recupera??o avan?ada de ?leo. O processo GAGD, que se encontra em fase de teste piloto em campo, est? sendo muito
estudado atrav?s de modelos f?sicos em escala de laborat?rio e em testemunhos, isto devido ?s altas recupera??es de ?leo em rela??o aos outros processos de inje??o de g?s. Este m?todo
consiste em injetar g?s no topo de um reservat?rio atrav?s de po?os injetores verticais ou horizontais e deslocar o ?leo, aproveitando a segrega??o gravitacional natural dos fluidos,
para um po?o produtor horizontal colocado na base do reservat?rio. Para estudar este processo foi idealizado um reservat?rio homog?neo e um modelo de fluido multicomponente com caracter?sticas parecidas aos campos de ?leo leve do Brasil para que, atrav?s de um simulador composicional, se analisem os par?metros operacionais. O processo foi simulado no programa comercial GEM da CMG (Computer Modelling Group). Os par?metros operacionais estudados foram a vaz?o de inje??o de g?s, o tipo de g?s injetado (g?s natural e CO2), a
localiza??o do po?o injetor e do po?o produtor. Tamb?m foi estudada a presen?a de aq??fero no processo. Os resultados mostraram que o m?ximo espa?amento vertical entre os dois
po?os, provocou a m?xima recupera??o de ?leo no GAGD. Tamb?m, verificou-se que a maiores vaz?es de inje??o, se obtiveram os maiores fatores de recupera??o. Este par?metro
controlou a velocidade da frente do g?s injetado e determinou se a for?a gravitacional domina ou n?o sobre o processo na recupera??o de ?leo. O g?s natural teve melhor desempenho que o CO2 e que, a presen?a de aq??fero no reservat?rio influenciou pouco no processo. Na an?lise econ?mica verificou-se que a inje??o de g?s natural obteve o melhor beneficio econ?mico que com CO2
|
Page generated in 0.1782 seconds