Dispersion of supercritical CO2 and CH4 in consolidated porous media for enhanced gas recovery simulations

Abdolvahab Honari, Thomas J. Hughes, Einar O. Fridjonsson, Michael L. Johns, Eric F. May

Research output: Contribution to journalArticleResearchpeer-review

32 Citations (Scopus)

Abstract

Enhanced gas recovery (EGR) is a promising technology offering both CO2 sequestration and enhanced recovery of natural gas when CO2 is re-injected into producing natural gas reservoirs. Mixing of CO2 and CH4 is, however, potentially problematic and could lead to asset contamination. Essential for effective assessment of EGR are reservoir simulations that require accurate descriptions of dispersive mixing of the two supercritical fluids. Here we systematically measure this supercritical dispersion data in sandstone rock cores, accounting for erroneous gravitational and entry/exit contributions. Using the measured value of dispersivity (α) as the characteristic length scale for mixing, we are able to reconcile our dispersion data with literature values for unconsolidated media (packed beds). Furthermore, our measurements of supercritical dispersion in consolidated porous media have almost 50 times less scatter than the data available in the literature for packed beds. The consequential dispersion correlation as a function of medium Péclet number captures variations with temperature, pressure and dispersing species.

Original languageEnglish
Pages (from-to)234-242
Number of pages9
JournalInternational Journal of Greenhouse Gas Control
Volume19
DOIs
Publication statusPublished - 1 Nov 2013
Externally publishedYes

Keywords

  • CO
  • Dispersion
  • Enhanced gas recovery
  • Sequestration
  • Supercritical fluids

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