Pressure Data Analysis in Two Phase Naturally Fractured Reservoirs With a Pseudo Steady State Flow Regime Using the TDS Technique

Abstract

The matrix-to-fracture interporosity parameter (λ), and fracture storativity (ω) are subject to changes during the life of an oil field. This depends entirely on the nature of saturation condition both in fractures and matrix blocks. Failure to consider two-phase flow parameters will result in inaccurate estimation of reservoir parameters. Because of the high amount of this type of behavior in many reservoirs worldwide, developing appropriate method is very important. A new procedure is presented for analyzing transient test in naturally fractured reservoirs with pseudo steady state two-phase (oil and water) flow using direct synthesis technique (TDS) to determining reservoir parameters. TDS is a modern technique that utilizes the characteristic lines and points found on the pressure and pressure derivative log-log plot. These points and lines are then used with appropriate equations to solve directly for desired reservoir parameters. The proposed methodology is successfully verified by its application to field simulated pressure data and a step-by-step procedure for calculating these parameters is included.