Papers › Three-dimensional buoyant hydraulic fracture growth: constant release from a point source
Three-dimensional buoyant hydraulic fracture growth: constant release from a point source
A. Möri, B. Lecampion
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Hydraulic fractures propagating at depth are subjected to buoyant forces caused by the density contrast between fluid and solid. This paper is concerned with the analysis of the transition from an initially radial towards an elongated buoyant growth -- a critical topic for understanding the extent of vertical hydraulic fractures in the upper Earth crust. Using fully coupled numerical simulations and scaling arguments, we show that a single dimensionless number governs buoyant hydraulic fracture growth: the dimensionless viscosity of a radial hydraulic fracture at the time when buoyancy becomes of order one. It quantifies if the transition to buoyancy occurs when the growth of the radial hydraulic fracture is either still in the regime dominated by viscous flow dissipation or is already in the regime where fracture energy dissipation dominates. A family of fracture shapes emerge at late time from finger-like (toughness regime) to inverted elongated cudgel-like (viscous regime). 3D toughness dominated buoyant fractures exhibit a finger-like shape with a constant volume toughness dominated head and a viscous tail having a constant uniform horizontal breadth: there is no further horizontal growth past the onset of buoyancy. However, if the transition to buoyancy occurs while in the viscosity dominated regime, both vertical and horizontal growths continue to match scaling arguments. As soon as the fracture toughness is not strictly zero, horizontal growth stops when the dimensionless horizontal toughness becomes of order one. The horizontal breadth follows the predicted scaling.
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