Multiple failure state triaxial testing of the Montney Formation

Elastic behaviour controls hydraulic fracture propagation and ultimately, the productivity of unconventional reservoirs. Various index tests and single stage triaxial tests are used to characterize elastic moduli but it can be difficult to obtain enough samples and sufficient information. This is partly due to the fissile nature of shales, which results in a paucity of representative core plugs. It is also partially due to the complex and heterogeneous nature of unconventional reservoir's geomechanical behaviour. The failure mechanics of unconventional rocks are poorly understood and seldom incorporated in hydraulic fracturing or geomechanical models. Yet, failure is major influence on fracture complexity and reservoir drainage volumes.