Modification of Vogel's Inflow Performance Relationship (IPR) for Dual Porosity Model

Abstract

The performance of a solution gas-drive reservoir can be predicted using Vogel inflow performance relation (or IPR), which simply relates the deliverability of a well to bottom-hole pressure and average reservoir pressure. While many studies have shown the success of Vogel-type IPR for single porosity reservoirs, the applicability of this method for naturally fractured reservoirs (NFRs), is under question mainly because of the complex flow behavior in matrix and fracture systems. The present study is undertaken to determine if the relation between NFR flowing wellbore pressure and oil production rate could be described by Vogel's IPR. For this purpose, a synthetic dual porosity fractured reservoir with typical rock and fluid properties is considered as a base-case. Identifying important parameters affecting the performance of a naturally fracture reservoir, a total of 22 simulations covering a wide range of reservoir fluid properties, fracture permeabilities, capillary pressure, block height, and recovery factor are made. The results show significant errors between simulation output and Vogel's IPR. A modification is made on Vogel's IPR to use it for performance prediction of dual porosity model.