publication . Article . 2009

Comparative Study of CO2 and N2 Foams in Porous Media at Low and High Pressure−Temperatures

Rouhi Farajzadeh;
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  • Published: 06 May 2009 Journal: Industrial & Engineering Chemistry Research, volume 48, pages 4,542-4,552 (issn: 0888-5885, eissn: 1520-5045, Copyright policy)
  • Publisher: American Chemical Society (ACS)
Abstract
We report an experimental study of the behavior of CO2 and N2 foams in granular porous media using X-ray computed tomography. In the experiments either CO2 or N2 gas is forced through natural porous media initially saturated with a surfactant solution, a process known as surfactant-alternating-gas or SAG. The CO2 was either under sub- or supercritical conditions, whereas N2 remained under subcritical conditions at all experimental conditions. We found that CO2 injection following a slug of surfactant can considerably reduce its mobility and promote higher liquid recovery at the experimental conditions investigated. Foaming of CO2 builds-up a lower pressure drop ...
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