Influence of multi-planes of weakness on unstable zones near wellbore wall in a fractured formation

The non-production time and consumption caused by borehole instability have elicited worldwide concern in the exploration and production of fractured shale formations because of the development of bedding planes and natural fractures. Therefore, the failure zone model is established in which the transversely isotropic stress model and multiple planes of the weakness criterion are incorporated. The collapse pressure and unusable areas under a...