The Effect of Pore Structure on CO2 Relative Permeability

In this study, the authors use measured CO2/brine relative permeability data available in the literature to study the behavior of the data obtained for various rocks. These measured CO2 relative permeabilities show large variations in the values of relative permeability and also in the trend of the relative permeability curves. The results of this study will allow identification of rocks that would be more suitable for CO2 injection on the basis of the pore structure and the distribution of the pores inside the rock.

Introduction

In much of the literature, the relative permeability of CO2 has been studied for each formation separately and the main factors considered to affect CO2relative permeability include fluid saturation, hysteresis, and interfacial tension (IFT). As for a group of formations with different rock types, the difference in CO2 relative permeability curves is mainly attributed to rock-type parameters. However, it has been found that even in a set of samples extracted from different formations in the same rock type or from a single formation, there is diversity in CO2 relative permeability curves. Pore structure or quality has been assumed to be responsible for the observed disparity, but no detailed explanation has been offered as to how it could result in different CO2 relative permeability curves for a set of formations in the same rock type. In this work, the authors introduce an improved concept of pore and throat distribution that will be used to interpret the observed differences in CO2 relative permeabilities.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 18125, “The Impact of Rock Pore Structure on CO2 Relative Permeability,” by Adel Traki and Mehran Sohrabi, SPE, Heriot-Watt University, prepared for the 2014 International Petroleum Technology Conference, Kuala Lumpur, 10–12 December. The paper has not been peer reviewed. Copyright 2014 International Petroleum Technology Conference. Reproduced by permission.
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The Effect of Pore Structure on CO2 Relative Permeability

01 July 2015

Volume: 67 | Issue: 7

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