HYDRAULIC FRACTURING—1: Natural fractures influence shear stimulation direction

Hydraulic fracturing in the presence of natural fractures causes a complex network of fractures to form because of shear and tensile failure.During hydraulical fracturing, shear failure in a reservoir appears pervasive where natural fractures occur.Hydraulic fracturing treatments induce a network of shear and tensile fractures in a reservoir and enhance the virgin permeability in a large volume around a well.In the Barnett shale, for example, microseismic bursts, which are shear-induced, are numerous, and extensive. Systematic shear failure appears to occur over a large region. Other gas fields in North America display similar complex attributes.There are four keys for understanding, mode...

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