Studies of Hydraulic Fracture-Propagation Behavior in Presence of Natural Fractures: Fully Coupled Fractured-Reservoir Modeling in Poroelastic Environments
Publication: International Journal of Geomechanics
Volume 13, Issue 6
Abstract
In this paper, the propagation behavior of an induced hydraulic fracture in the presence of a natural fracture is described. A complex meshing and finite-element technique are employed to couple a poroelastic formation, a hydraulic fracture, and an arbitrarily oriented natural fracture. Possibilities of fracture deviation, arrest, and crossing for various angles of approach are investigated under different scenarios of in situ stress contrast, rock strength, and natural fracture geometry (length). Results of this study show that orientation of natural fracture and its length have a profound effect on induced hydraulic fracture propagation. It has been observed that, in most cases, the induced hydraulic fracture crosses short natural fractures (). As the induced hydraulic fracture approaches the natural fracture, fluid leak off increases, and consequently, the width of the induced fracture at the wellbore (fracture mouth) decreases. Once the induced hydraulic fracture breaks out of the natural fracture, the fluid leak off decreases, thus increasing the width of the induced fracture. It has been also observed that propagation of induced fracture is blocked or diverted by the presence of a long natural fracture (). With an increase in the injection rate, however, the induced fracture is likely to cross a long natural fracture (). The new understandings derived from the fully coupled poroelastic model have many beneficial applications, including design and optimization of hydraulic fracture treatments in naturally fractured reservoirs (tight gas and shale gas reservoirs) and permeability enhancement by fluid-induced shear displacement of fracture surfaces [enhanced geothermal systems (EGS)].
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Acknowledgments
The financial support from the Faculty of Engineering, University of New South Wales is highly appreciated. The writers also thank the technical editors for their valuable comments.
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Published In
International Journal of Geomechanics
Volume 13 • Issue 6 • December 2013
Pages: 809 - 826
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 10, 2012
Accepted: Nov 29, 2012
Published online: Nov 15, 2013
Published in print: Dec 1, 2013
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