DefinePK

Abstract

Beyond doubt, the productivity index is one of the most important key parameters in reservoir evaluation and characterization. It is a screening guide to establish the reservoir size, the presence on an aquifer and the connectivity degree. Thereby, its accurate determination is a challenge for engineers. This paper presents a productivity equation of a horizontal well in pseudo-steady state in a closed anisotropic box-shaped reservoir, using a uniform line sink model. A new equation for calculating pseudo skin factor due to partial penetration is also proposed. Compared with the equations for horizontal wells in pseudo-steady state in the literature, the new equations are more practical and easy to use in the field practice.