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Mixing and reactions in multiphase flow through porous media

Abstract : The understanding and quantification of flow and transport processes in multiphase systems remains a grand scientific and engineering challenge in natural and industrial systems (e.g., soils and vadose zone, CO2 sequestration, unconventional oil and gas extraction, enhanced oil recovery). Beyond the kinetic of the chemical reactions, mixing processes in porous media play a key role in controlling both fluid-fluid and fluid-solid reactions. However, conventional continuum-scale models and theories oversimplify and/or ignore many important pore-scale processes. Multiphase flows, with the creation of highly heterogeneous fluid velocity fields (i.e., low velocities regions or stagnation zones, and high velocity regions or preferential paths), makes conservative and reactive transport more complex. We present recent multi-scale experimental developments and theoretical approaches to quantify transport, mixing, and reaction and their coupling with multiphase flows. We discuss our main findings: i) the sustained concentration gradients and enhanced reactivity in a two-phase system for a continuous injection, and the comparison with a pulse line injection; ii) the enhanced mixing by a third mobile-immiscible phase; and iii) the role that capillary forces play in the localization of the fluid-solid reactions. These experimental results are for highly-idealized geometries, however, the proposed models are related to basic porous media and unsaturated flow properties, and could be tested on more complex systems.
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Conference papers
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https://hal-insu.archives-ouvertes.fr/insu-01416933
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, December 15, 2016 - 9:57:57 AM
Last modification on : Friday, April 5, 2019 - 8:17:51 PM

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  • HAL Id : insu-01416933, version 1

Citation

Joaquin Jimenez-Martinez, Tanguy Le Borgne, Yves Méheust, Mark Porter, Pietro de Anna, et al.. Mixing and reactions in multiphase flow through porous media . American Geophysical Union Fall Meeting 2016, American Geophysical Union, Dec 2016, San Francisco, United States. pp.H13N-01. ⟨insu-01416933⟩

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