Abstract
In this paper we study the influence of the insitu pore pressure on rock deformation and its implications on propagation pressures and fracture dimensions in hydraulic fracturing. The fracture propagation is performed for plain strain and mode-I loading conditions. The fracture is driven by an incompressible Newtonian viscous fl uid and leak-off is modeled to account for diffusion effects. The cohesive zone model (CZM) is used as the propagation criterion. The Mohr-Coulomb yield criterion is utilized for describing the deformation of the medium. From the analyses performed for fractures driven in formations with elevated pore pressure fi elds we found increased plastic yielding, high propagation pressures and wider fracture profi les. These results can explain partially the differences between fi eld measurements and conventional model predictions.
Original language | English |
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Title of host publication | Computer Methods for Geomechanics |
Subtitle of host publication | Frontiers and New Applications |
Pages | 684-689 |
Number of pages | 6 |
Volume | 2 |
Publication status | Published - 2011 |
Event | 13th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2011 - Melbourne, VIC, Australia Duration: 9 May 2011 → 11 May 2011 |
Other
Other | 13th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2011 |
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Country/Territory | Australia |
City | Melbourne, VIC |
Period | 9/05/11 → 11/05/11 |