Experimental determination of wettability and heterogeneity effect on CO 2 distribution in porous media

Pengfei Lv, Yu Liu, Lanlan Jiang, Yongchen Song, Bohao Wu, Jiafei Zhao and Yi Zhang

Greenhouse Gases: Science and Technology, 2016, vol. 6, issue 3, 401-415

Abstract: : The geological sequestration of carbon dioxide (CO 2 ) is considered a promising technology for CO 2 emissions. However, accurate estimation of the storage capacity for CO 2 remains a challenge owing to the effect of capillary pressure variation. The CO 2 ‐salty aqueous contact angle and sub‐core scale heterogeneity are the major factors that influence capillary pressure. This paper reports the results of CO 2 /brine two‐phase flow experiments in porous media by using an X‐ray computed tomography (CT) technique at 40°C and 8 Mpa and examines the strong influence of wettability and sub‐core scale heterogeneities on the spatial distribution of CO 2 . Gas injection experiments were conducted at flow rates of 0.1 mL/min, 0.2 mL/min, and 0.5 mL/min, and the porous media were packed with feldspar, quartz, or dolomite. This study indicates that at the core scale, the wettability of porous media is a crucial factor in determining CO 2 saturation. Capillary fingering and low CO 2 saturation occurred with high water wettability. Sub‐core scale heterogeneities controlled the CO 2 distribution and saturation variation along the porous media, particular that with small pore sizes. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:6:y:2016:i:3:p:401-415

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