Análise de viabilidade de injeção de fluidos alternativos ao vapor em reservatórios de óleo pesado
Many of hydrocarbon reserves existing in the world are formed by heavy oils (°API between 10 and 20). Moreover, several heavy oil fields are mature and, thus, offer great challenges for oil industry. Among the thermal methods used to recover these resources, steamflooding has been the main econom...
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| Formato: | doctoralThesis |
| 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/123456789/13019 |
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| Resumo: | Many of hydrocarbon reserves existing in the world are formed by heavy oils (°API
between 10 and 20). Moreover, several heavy oil fields are mature and, thus, offer great
challenges for oil industry. Among the thermal methods used to recover these resources,
steamflooding has been the main economically viable alternative. Latent heat carried by steam
heats the reservoir, reducing oil viscosity and facilitating the production. This method has many
variations and has been studied both theoretically and experimentally (in pilot projects and in full
field applications). In order to increase oil recovery and reduce steam injection costs, the
injection of alternative fluid has been used on three main ways: alternately, co-injected with
steam and after steam injection interruption. The main objective of these injection systems is to
reduce the amount of heat supplied to the reservoir, using cheaper fluids and maintaining the
same oil production levels. This works discusses the use of carbon dioxide, nitrogen, methane
and water as an alternative fluid to the steam. The analyzed parameters were oil recoveries and
net cumulative oil productions. The reservoir simulation model corresponds to an oil reservoir of
100 m x 100 m x 28 m size, on a Cartesian coordinates system (x, y and z directions). It is a semi
synthetic model with some reservoir data similar to those found in Brazilian Potiguar Basin. All
studied cases were done using the simulator STARS from CMG (Computer Modelling Group,
version 2009.10). It was found that waterflood after steam injection interruption achieved the
highest net cumulative oil compared to other fluids injection. Moreover, it was observed that
steam and alternative fluids, co-injected and alternately, did not present increase on profitability
project compared with steamflooding |
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