Efeito da perda de carga e calor no poço injetor no processo de drenagem gravitacional assistido com vapor e solvente
Nowadays, most of the hydrocarbon reserves in the world are in the form of heavy oil, ultra - heavy or bitumen. For the extraction and production of this resource is required to implement new technologies. One of the promising processes for the recovery of this oil is the Expanding Solvent Stea...
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Formato: | Dissertação |
Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/12991 |
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Resumo: | Nowadays, most of the hydrocarbon reserves in the world are in the form of heavy oil,
ultra - heavy or bitumen. For the extraction and production of this resource is required to
implement new technologies. One of the promising processes for the recovery of this oil is the
Expanding Solvent Steam Assisted Gravity Drainage (ES-SAGD) which uses two parallel
horizontal wells, where the injection well is situated vertically above the production well. The
completion of the process occurs upon injection of a hydrocarbon additive at low
concentration in conjunction with steam. The steam adds heat to reduce the viscosity of the oil
and solvent aids in reducing the interfacial tension between oil/ solvent. The main force acting
in this process is the gravitational and the heat transfer takes place by conduction, convection
and latent heat of steam. In this study was used the discretized wellbore model, where the well
is discretized in the same way that the reservoir and each section of the well treated as a block
of grid, with interblock connection with the reservoir. This study aims to analyze the
influence of the pressure drop and heat along the injection well in the ES-SAGD process. The
model used for the study is a homogeneous reservoir, semi synthetic with characteristics of
the Brazilian Northeast and numerical simulations were performed using the STARS thermal
simulator from CMG (Computer Modelling Group). The operational parameters analyzed
were: percentage of solvent injected, the flow of steam injection, vertical distance between the
wells and steam quality. All of them were significant in oil recovery factor positively
influencing this. The results showed that, for all cases analyzed, the model considers the
pressure drop has cumulative production of oil below its respective model that disregards such
loss. This difference is more pronounced the lower the value of the flow of steam injection |
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