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| Titel |
Viscous fingering and dynamic saturation-pressure curves in two-dimensional porous media |
| VerfasserIn |
Grunde Løvoll, Mihailo Jankov, Knut Måløy, Renaud Toussaint, Jean Schmittbuhl, Gerhard Schäfer, Yves Meheust |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250057606
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| Zusammenfassung |
| We present results from primary drainage experiments in quasi-twodimensional porous
models. We study the unstable displacement of a viscous liquid by air in transparent models
that allow the displacement process and structure to be monitored in space and
time. Primary drainage experiments are carried out under various displacement
velocities.
By combining detailed information on the displacement structure with global
measurements of pressure, saturation and the capillary number Ca, we obtain a scaling
relation that relates pressure, saturation, system size, and capillary number. This
scaling relation allows pressure–saturation curves for a wide range of capillary
numbers to be collapsed on the same master curve. We also show that in the case of
primary drainage, the dynamic effects in the capillary pressure–saturation relationship
commonly observed on partially water-saturated soil samples can be explained by the
combined effect of capillary pressure along the invasion front of the gaseous phase,
and pressure changes resulting from viscous forces in the displaced wetting liquid
phase.
Reference:
G. Løvoll et al., Trans. Porous Med., in press (2010) |
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