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The deflation of a hydraulic fracture subject to fluid withdrawal through a narrow conduit: the influence of material toughness
Published online by Cambridge University Press: 18 March 2025
Abstract
We study the dynamic deflation of a hydraulic fracture subject to fluid withdrawal through a narrow conduit located at the centre of the fracture. Recent work revealed a self-similar dipole-flow regime, when the influence of material toughness is negligibly small. The focus of the current work is on the influence of material toughness, which leads to an additional self-similar regime of fracture deflation with fixed frontal locations in the toughness-dominated regime. The two limiting regimes can be distinguished by a dimensionless material toughness $\Pi _k$, defined based on a comparison with the influence of the viscous thin film flow within the fracture:
$\Pi _k \to 0$ indicates the dipole-flow regime, while
$\Pi _k \to \infty$ indicates the fixed-length regime. For intermediate
$\Pi _k$, the fracture’s front continues to propagate during an initial period of deflation before it remains pinned at a fixed location thereafter. A regime diagram is then derived, with key scaling behaviours for the frontal dynamics, pressure and volume evolution summarised in a table for the self-similar stage. A comparison is also attempted between theoretical predictions and available experimental observations of viscous backflows from transparent solid gelatins.
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- © The Author(s), 2025. Published by Cambridge University Press