Abstract

This paper presents a technique for pressure transient and its derivative analysis for single porosity reservoirs in a class of geological setting that are not amenable to conventional techniques. The application of a fractal model to analyze unsteady state pressure transient data of Newtonian fluids in a heterogeneous reservoir for heterogeneity characterization is considered. The fractal geometry is a very powerful method to describe most complex phenomenon, especially to scale the nonuniformity and non-sequences of heterogeneous porous media. The pressure transient response is analyzed for flow in a connected fracture network and fracture with matrix participation. With the help of these approaches, single-phase fluid flow in the fractal object is described by appropriate modification in diffusivity equation. The automatic type curve matching technique for both pressure and its derivative are used in evaluating reservoir parameters from pressure buildup/drawdown and falloff test data of heterogeneous reservoir. The goal of the pressure transient data analysis is to establish a reasonable estimate of the reservoir parameters of interest for better understanding of the reservoir behavior. Recent experiences have brought forward more reasonable expectations of geologists, geophysicists and reservoir engineers by sharing their knowledge in integrating various sources of information in finding the reservoir heterogeneity. Thus permeability data estimated from transient well test data are utilized to generate 3-D model by combining it with porosity derived from seismic or well log measured porosity with the help of geostatistical techniques. The timely acquisition of data and their continued evaluation at unknown locations with geo-statistical techniques are foundational to sound the reservoir management to develop the field and implement the various applicable improved oil or enhanced oil recovery (IOR/EOR) schemes