Growth of a radial hydraulic fracture accounting for the viscous fluid flow in a rough cohesive zone

We investigate the growth of an axisymmetric hydraulic fracture in an impermeable quasi-brittle material accounting for the presence of a fluid lag. The process zone is simulated using a linear softening cohesive zone model and is characterized by an increased resistance to the fluid flow due to fracture roughness. In the context of a partially-filled cohesive zone, the fracture roughness decreases the tip permeability and further localizes the pressure drop inside the cohesive zone. As a result, a wider fracture opening and higher net pressure are obtained, indicating an increase of the apparent fracture energy. Similar to the linear elastic case, the fracture growth is closely related to a dimensionless parameter ψ which describes the transition nature from the lag-viscosity-toughness regimes. The propagation also depends on the ratio between the in-situ minimum confining stress and the maximum cohesive traction σo/σT and the type of fluid flow deviation in small rough apertures.

Published in:
[Proceedings of the 2019 ARMA-CUPB Geothermal International Conference]
Presented at:
2019 ARMA-CUPB Geothermal International Conference, Beijing, China, August 5-8, 2019

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 Record created 2019-08-19, last modified 2019-12-05

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