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Measurements of the capillary trapping of super‐critical carbon dioxide in Berea sandstone

Measurements of the capillary trapping of super‐critical carbon dioxide in Berea sandstone We measure primary drainage capillary pressure and the relationship between initial and residual non‐wetting phase saturation for a supercritical carbon dioxide (CO2)‐brine system in Berea sandstone. We use the semi‐permeable disk (porous‐plate) coreflood method. Brine and CO2 were equilibrated prior to injection to ensure immiscible displacement. A maximum CO2 saturation of 85% was measured for an applied capillary pressure of 296 kPa. After injection of brine the CO2 saturation dropped to 35%; this is less than the maximum trapped saturation of 48% measured in an equivalent n‐decane (oil)‐brine experiment. The dimensionless capillary pressure is the same to within experimental error for supercritical CO2‐brine, n‐decane‐brine and a mercury‐air system. CO2 is the non‐wetting phase and significant quantities can be trapped by capillary forces. We discuss the implications for CO2 storage. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Measurements of the capillary trapping of super‐critical carbon dioxide in Berea sandstone

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References (55)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/2011GL046683
Publisher site
See Article on Publisher Site

Abstract

We measure primary drainage capillary pressure and the relationship between initial and residual non‐wetting phase saturation for a supercritical carbon dioxide (CO2)‐brine system in Berea sandstone. We use the semi‐permeable disk (porous‐plate) coreflood method. Brine and CO2 were equilibrated prior to injection to ensure immiscible displacement. A maximum CO2 saturation of 85% was measured for an applied capillary pressure of 296 kPa. After injection of brine the CO2 saturation dropped to 35%; this is less than the maximum trapped saturation of 48% measured in an equivalent n‐decane (oil)‐brine experiment. The dimensionless capillary pressure is the same to within experimental error for supercritical CO2‐brine, n‐decane‐brine and a mercury‐air system. CO2 is the non‐wetting phase and significant quantities can be trapped by capillary forces. We discuss the implications for CO2 storage.

Journal

Geophysical Research Letters – Wiley

Published: Mar 1, 2011

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