Transient Pressure Analysis and Productivity Index Estimation in Horizontal Wells

Abstract

The Analysis of pressure build-up tests in horizontal wells are known as complicated due to changing of flow regimes, formation thickness, well horizontal length….etc. The main objective of study is presents an interpretation method for horizontal well pressure transient testing that is applied to a buildup test from a horizontal well The use of transient well testing for determining reservoir parameters and productivity of horizontal wells has become common because of the upsurge in horizontal drilling. Initially, horizontal well tests were analyzed with the conventional techniques. During the last decade, analytic solutions have been presented for the pressure behavior of horizontal wells. New flow regimes have been identified, and simple equations and flow regime existence criteria have been presented for them [1]. The flow regimes are now used frequently to estimate horizontal and vertical permeability of the reservoir, wellbore skin, and reservoir pressure. Where result of The Giger-Reiss-Jourdan and Joshi was considered more representative result as compared with actual the productivity index and flow rate for isotropic and anisotropy reservoir. One objective of this work is to recall the proper way to use these formulae and to recall the assumptions made that may limit their use.