RESUMO -A injeção cíclica de vapor é um método especial de recuperação de petróleo caracterizado pela redução da viscosidade do óleo após injeção de vapor no poço. Porém, como qualquer método térmico, há uma grande preocupação em relação ao excesso de calor que chega ao revestimento, sendo ele suscetível a um estresse térmico e danos ao reservatório. Com o intuito de solucionar este problema, a empresa ENGEPET desenvolveu o sistema ICVPA(Injeção Cíclica de Vapor com Produção Alternada) para controle da temperatura no revestimento dos poços. O objetivo do atual trabalho é, através do software ANSYS CFX, simular o sistema ICVPA, a fim de analisar o comportamento fluidodinâmico das correntes de água e vapor para futuro estudo de controle de temperatura na parede do revestimento. Foram utilizadas três diferentes vazões de água e analisado o perfil de temperatura, pressão e coeficiente de transferência de calor por convecção ao longo de 15 metros de comprimento de poço. Os resultados encontrados estão de acordo com a literatura e podem contribuir positivamente ao estudo do método ICVPA e seu controle de temperatura no revestimento de poços de petróleo.
Cyclic steam injection is an enhanced oil recovery (EOR) process which is characterized by oil viscosity reduction after the injection of steam into the well. However, like any thermal method, there is great concern regarding the excess of heat coming into the oil well casing, which is susceptible to thermal stress and may damage the reservoir. In order to solve this problem, the company ENGEPET developed the Cyclical Steam Injection and Pneumatic Artificial Lift with water seal (CSI/PAL/WS) system for temperature control in oil well casings. This work proposes a model for predicting the thermal exchange between the water and steam inside the CSI/PAL/WS system using Computational Fluid Dynamics (CFD). A simplified model was proposed and results show that it has great potential to contribute to the study of the CSI/PAL/WS system, as well as to predict operating conditions that may prevent the temperature of well casings to exceed safety limits.
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