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| Titel |
Dynamic aerofracture or hydrofracture of dense granular packing: pressure and viscosity control of the fracture patterns |
| VerfasserIn |
Michael J. Niebling, Renaud Toussaint, Eirik G. Flekkøy, Knut Jørgen Måløy |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084653
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| Zusammenfassung |
| Stress induced by fluid or gases can cause diverse materials to break and fracture. Such
hydraulic fractures are a natural and common phenomenon in the field of volcanism and are
artificially initiated to enhance the recovery of natural gas and mineral oil by fracturing the
reservoir rock with pressurized fluids. A procedure also known as fracking. Recently a new
perspective on hydrofractures was added with the storage of supercritical CO2. In this
respect two scenarios are considered. First it is one option to inject CO2 into existing
hydrofractures, and second the injection of the CO2 can create additional fractures. The
typical components for such fractures are a porous material and a compressible
gas.
The dynamics of such fractures and displacement patterns are simulated and studied in a
rectangular Hele-Shaw cell filled with a dense but permeable two-dimensional granular
layer. The model used, mixing highly deformable solid and fluid components, can
simulate sedimentation problems [1,2], as well as hydrofracture or aerofracture
ones.
The emerging displacement patterns and fractures variate according to the properties of
the injected fluid or gas and the characteristics of the granular phase [3].
The physics behind these variations is discussed and explained. The role of
the fluid viscosity and system size shows to lead to a transition from fracturing to
compaction, depending on the dynamics of convection versus diffusion of overpressure.
The dependence of the obtained patterns on the injection pressure is also explored
[4].
References:
[1] Niebling, M.J., E.G. Flekkøy, K.J. Måløy, R. Toussaint, Sedimentation instabilities:
impact of the fluid compressibility and viscosity, Phys. Rev. E 82, 051302, 2010. doi:
10.1103/PhysRevE.82.051302
[2] Niebling, M.J., E.G. Flekkøy, K.J. Måløy, R. Toussaint, Mixing of a granular layer
falling through a fluid, Phys. Rev. E 82, 011301 (2010) doi: 10.1103/PhysRevE.82.011301
[3] Niebling, M., R. Toussaint, E.G. Flekkøy and K.J. Måløy, Dynamic aerofracture of
dense granular packings, Phys. Rev. E 86, 061315 (2012).
[4] Niebling, M., R. Toussaint, E.G. Flekkøy and K.J. Måløy, Estudios numéricos de
Aerofractures en medios poros / Numerical Studies of Aerofractures in Porous Media,
Revista Cubana de Fisica, 29, 1E, 1E66, 2012. |
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