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Imbibition forcée en milieu poreux

Abstract : Understanding two-phase flow in heterogeneous media is of great importance for a number of industrial processes. One of the most prominent examples is enhanced oil recovery which has driven fundamental and applied research in this fieldfor decades. However our understanding has remained extremely unbalanced. The case of spontaneous imbibition of a fluid in a porous medium is fairly well understood,whereas quantitative descriptions of forced imbibition in the presence of anunfavorable viscosity ratio is still lacking. Combining large-scale observations and confocal imaging of microfluidic experiments, we studied the morphology and dynamicsof forced imbibition in homogeneous porous media. We identify four classesof three-dimensional patterns resulting from different dynamics at the pore-scale, and having a clear signature on the macroscopic observables. By means of confocalmicroscopy allowing us to visualize three dimensional features of the local dynamics,we show that the transitions between the four imbibition scenarios result from two dynamical wetting transitions and one interfacial instability. In addition,unlike previous studies, we investigate the evolution of those patterns undercontinuous injection over long time scales. We evidence their aging according to acapillary-coarsening process.
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Submitted on : Monday, December 11, 2017 - 11:59:56 PM
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  • HAL Id : tel-01661429, version 1

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Céleste Odier. Imbibition forcée en milieu poreux. Matière Molle [cond-mat.soft]. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSEN056⟩. ⟨tel-01661429⟩

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