EVALUATION OF DOWNHOLE ELECTRICAL HEATING IN HEAVY OIL OF THE ORINOCO BELT, VENEZUELA. 

S.MARFISSI, F. CAMPOS, C. OSUNA, J. BROWN PDVSA E&P 

Abstract 

The study was based on the assessment through simulations of the effect of downhole electric heating in heavy oil wells, including numerical simulation and the possible increase of temperature in the reservoir. Concerning the selected equipment, several commercial offers were analyzed where the heating cable was chosen. The main component of that equipment is a conductor wire that is placed opposite to the producing zone. The increase in temperature causes reduction in oil viscosity and drop of frictional losses between the production zone and the pump intake. 

The study was divided into two stages. Firstly, the nodal analysis simulation was carried out and where the performance of the well was evaluated with the use of this downhole heating system, obtaining an oil production rise of 25%, that is, 56 BOPD on the well under study. Secondly, a CFD (Computational Fluid Dynamics) was performed to predict the heating impact on the reservoir. As the well is producing, it was determined that heating does not reach the pay sand. However, when the well was shut down for seven days, an increase in the reservoir temperature was observed, rising the productivity index from 0.81 to 1.04. It is important to point out that both models were entirely developed by PDVSA. According to this study, a pilot test will be conducted in Morichal District, where 6 wells were chosen with an associated oil production of 865 BOPD, and with the application of this system oil production rate can be increased by 62 %.

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