Inflow Performance Relationships, IPR, are quantitative estimates of the productive potential of a well-reservoir system. Through this relationship, engineers determine basic elements such as the optimum production scheme and artificial lift design and operation. Several authors studied IPR in vertical and deviated wells considering two and three-phase flow in light oils. Other studies have also estimated productivity index for horizontal and slanted wells but only based on single-phase flow. All of them have not explicitly included how the oil API gravity affects the performance. Since a large amount of the world oil reserves are heavy oils, the goal of this research is to generate a general Vogel type correlation valid not only for light oil reservoirs but also for heavy oils. The experimental study, performed with numerical reservoir simulation, was run over variables such as: permeability; relative permeability curves; reservoir pressure, degree of depletion, and PVT fluids properties. Due to the huge advantage of horizontal and deviated wells for producing heavy oil, vertical to horizontal permeability ratios was also analyzed within different angles of inclination. Furthermore, different water cuts were generated for vertical wells using reservoir water saturation in order to evaluate the effect of this variable over the IPR. A general correlation for the V coefficient of Vogel's equation was generated that depends on the angle of inclination of the well, and several reservoir and fluids characteristic. Additionally, reservoir depletion was addressed through the reservoir pressure ratio with respect to the bubble point pressure. The application of the relationship described in this study is simple and only requires common known parameters of the field.
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