Analysis of infl ow performance relationship and reservoir characteristics using Saphir software

Abstract

Petroleum production from the reservoir is initially occurs by the natural energy of the reservoir itself. The reservoir pressure is usually high at the early stage of reservoir life, thus, it pumps crude oil to the surface. However, after some time of production, reservoir pressure starts to decline. In addition, penetration of solid particles into the pores causes plugging and results in formation permeability reduction. Hence, natural production from the reservoir starts to decrease after some time, depending on pressure drop rate and the degree of damage to the formation. Well testing is one of the practical methods for analysing the well. Pressure build up test is one of the most widely used well testing methods for analysing the well. In this study, a pressure build up test was conducted for 24 hours and then the pressure data were analysed using Saphir software. Finally, the well characteristics were used to analyse the inflow performance relationship (IPR) of the well. The well testing results showed that the well suffers from high skin, which hinders the effective production from the reservoir. In addition, IPR analysis using Vogel's and Darcy's method showed that the absolute open flow (AOF) is affected by the skin factor. The resulted AOF was always higher without the effect of skin factor included.