Abstract
Modeling of hydraulic fracturing processes is of great importance in computational geosciences. In this paper, a phase-field model is developed and applied for investigating the hydraulic fracturing propagation in saturated poroelastic rocks with pre-existing fractures. The phase-field model replaces discrete, discontinuous fractures by continuous diffused damage field, and thus is capable of simulating complex cracking phenomena such as crack branching and coalescence. Specifically, hydraulic fracturing propagation in a rock sample of a single pre-existing natural fracture or natural fracture networks is simulated using the proposed model. It is shown that distance between fractures plays a significant role in the determination of propagation direction of hydraulic fracture. While the rock permeability has a limited influence on the final crack topology induced by hydraulic fracturing, it considerably impacts the distribution of the fluid pressure in rocks. The propagation of hydraulic fractures driven by the injected fluid increases the connectivity of the natural fracture networks, which consequently enhances the effective permeability of the rocks.
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This study received support by the Australian Research Council Discovery Project funding scheme (Project Number DP150104257).
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Ni, L., Zhang, X., Zou, L. et al. Phase-field modeling of hydraulic fracture network propagation in poroelastic rocks. Comput Geosci 24, 1767–1782 (2020). https://doi.org/10.1007/s10596-020-09955-4
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DOI: https://doi.org/10.1007/s10596-020-09955-4