Análise numérica da dissipação de calor do motor elétrico do sistema BCSS em skid
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Data
2018-03-08
Autores
Martins, Jonathan Ribeiro
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Universidade Federal do Espírito Santo
Resumo
The recent development of ESP in the Skid, installed in the seabed downstream of the wellhead in a marine oil production system, is an alternative to the conventional system with the set installed at the bottom of the producing well, facilitating interventions in case of failure. The pump is driven by an electric motor whose cooling must be efficient to ensure the continuity of its operation. The heat withdrawal is performed by the fluid produced. The purpose of this dissertation is to understand the process of electric motor cooling to the single-phase and turbulent flow with convection heat transfer in an annular geometry, which represents the space formed between a capsule and the ESP in the Skid system motor. With this objective is used the Computational Fluid Dynamics (CFD) to solve this single-phase flow, using the kappa-epsilon standard with improved wall function (Enhanced Wall Treatment). Four flow rates are considered, three fluids with different Prandtl numbers, three configurations of different annular geometries, one concentric and two eccentric, together with the condition of the constant temperature on the motor surface. The simulations are validated by comparing the Nusselt number in the developed region with the Gnielinski correlation. It is observed that the simulation of this problem has geometric dependence, being necessary the use of a 3D geometry to correctly represent the phenomenon. If the constant heat flux condition were used, the motor temperature would have lower intensities at the beginning and larger at the end of the geometry. Therefore, the higher the Nusselt number, the greater the heat transfer, thus intensifying the cooling of the electric motor. In the eccentric geometry a momentum transfer from the lower to the upper annular region is observed, causing the Nusselt number present an angular variation. In eccentric geometries the flow develops in greater lengths, observing that the greater the eccentricity, the greater this length. Finally, for the ESP in the Skid system the use of an eccentric geometry is not adequate.
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Palavras-chave
ESP in the Skid , Engine cooling , Annular eccentricity , Nusselt number , Resfriamento de motor , Excentricidade anular , Número de Nusselt , CFD , S-BCSS , Motores elétricos - Resfriamento
Citação
MARTINS, Jonathan Ribeiro. Análise numérica da dissipação de calor do motor elétrico do sistema BCSS em skid. 2018. 144 f. Dissertação (Mestrado em Energia) - Programa de Pós-Graduação em Energia, Universidade Federal do Espírito Santo, São Mateus, 2018.