NDLI: Injection, Flow, and Mixing of CO$_{2}$ in Porous Media with Residual Gas

Content Provider	Springer Nature Link
Author	Oldenburg, C. M. Doughty, Christine
Copyright Year	2010
Abstract	Geologic structures associated with depleted natural gas reservoirs are desirable targets for geologic carbon sequestration (GCS) as evidenced by numerous pilot and industrial-scale GCS projects in these environments world-wide. One feature of these GCS targets that may affect injection is the presence of residual CH$_{4}$. It is well known that CH$_{4}$ drastically alters supercritical CO$_{2}$ density and viscosity. Furthermore, residual gas of any kind affects the relative permeability of the liquid and gas phases, with relative permeability of the gas phase strongly dependent on the time-history of imbibition or drainage, i.e., dependent on hysteretic relative permeability. In this study, the effects of residual CH$_{4}$ on supercritical CO$_{2}$ injection were investigated by numerical simulation in an idealized one-dimensional system under three scenarios: (1) with no residual gas; (2) with residual supercritical CO$_{2}$; and (3) with residual CH$_{4}$. We further compare results of simulations that use non-hysteretic and hysteretic relative permeability functions. The primary effect of residual gas is to decrease injectivity by decreasing liquid-phase relative permeability. Secondary effects arise from injected gas effectively incorporating residual gas and thereby extending the mobile-gas plume relative to cases with no residual gas. Third-order effects arise from gas mixing and associated compositional effects on density that effectively create a larger plume per unit mass. Non-hysteretic models of relative permeability can be used to approximate some parts of the behavior of the system, but fully hysteretic formulations are needed to accurately model the entire system.
Starting Page	201
Ending Page	218
Page Count	18
File Format	PDF
ISSN	01693913
Journal	Transport in Porous Media
Volume Number	90
Issue Number	1
e-ISSN	15731634
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-09-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geologic carbon sequestration Depleted gas reservoir Enhanced gas recovery Residual gas Hysteretic relative permeability Civil Engineering Hydrogeology Industrial Chemistry/Chemical Engineering Classical Continuum Physics Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Catalysis

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