Interaction behavior between hydraulic fractures and interface in coal-rock complex rock layer: Experimental study and application exploration
Bo Li,
Zhen Shi,
Junxiang Zhang
et al.
Abstract:To achieve long-term and efficient gas extraction in soft, low-permeability coal seams, this study conducted hydraulic fracturing experiments on coal-rock complexes under true triaxial conditions. The pattern of hydraulic fractures (HFs) was reconstructed based on the fractal dimension concept. The results indicate that the tendency of the complex rock layers to initiate fractures toward the coal weakens the trend of increasing fracture initiation pressure with rising geostress. When HFs interact with the inte… Show more
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