Summary of Single-Phase Oil Inflow Performance Relationships

The presented three inflow performance equations that can be used to analyze the reservoir behavior for single-phase oil production: steady-state, transient, and pseudosteady-state flows. The production engineer selects the most appropriate of these relationships based on the far-field boundary condition for the well of interest. If the pressure, p_e, at the drainage boundary can be approximated as being constant, the steady-state equation should be used. If there is no effect of a boundary felt at the well, transient flow is occurring. Finally, if the boundary at r_e is a no-flow boundary being felt at the well, the well performance is pseudosteady-state.