Fieldwide Determination of Directional Permeabilities Through Transient Well Testing

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Knowledge of the maximum- and minimum-permeability directions in anisotropic reservoirs helps to optimize injector and producer locations and is important for reservoir management, especially under secondary or enhanced recovery of hydrocarbons. The complete paper describes a method using transient-test data rich with dynamic information aiming to provide fieldwide permeability distribution in well-spacing scale, which is relevant for estimating fluid movement and recovery.

Introduction

The knowledge of flow communication between wells is key information for reservoir management, especially in secondary or tertiary recovery. The surveillance methods to collect dynamic data to gain such knowledge include multiple-well pressure-transient tests and tracer tests. The measurements of tracer agents arriving at producing wells provide direct confirmation of flow communication. Interwell transient tests derive similar information through the measurement of pressure responses (at observation wells) to the production- or injection-rate changes at an active well, and the time required to conduct such tests is much shorter than the time required to conduct tracer tests. For anisotropic reservoirs, such as naturally fractured fields or channel systems, knowing the permeability tensor directions and the ratios of the maximum to the minimum permeability in various locations in the field provides better opportunities to make optimal operational decisions.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 181437, “Fieldwide Determination of Directional Permeabilities Using Transient Well Testing,” by Yan Pan, Medhat Kamal, and Wayne Narr, Chevron, prepared for the 2016 SPE Annual Technical Conference and Exhibition, Dubai, 26–28 September. The paper has not been peer reviewed.
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Fieldwide Determination of Directional Permeabilities Through Transient Well Testing

01 February 2017

Volume: 69 | Issue: 2

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