Transverse hydraulic fracturing along the horizontal well segment is the key technology for developing the low permeability shale reservoir, and the efficiency of the horizontal drilling and completion is growing. While concurrent with advancing D&C technologies, the well bore integrity, particularly on production casing deformation is worthy of study. To reveal the casing deforming mechanism, a 2D finite element model of injection-induced deformation under hydraulic fracturing is established in this study. The poro-elastic constitutive relation is employed to analyze the changes of stress and flow fields during hydraulic fracturing. The cohesive zone model is adopted to simulate fracture growth. Results indicate that hydraulic fracturing would cause formation deformation and natural fracture slippage. The casing failure mechanism is identified as shear deformation induced by the slippage of shear fractures during hydraulic fracturing. This study supplies an easy method to forecast formation/wellbore response and casing deformation under hydraulic fracturing.
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