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Estimation or determination of fracture geometry has been one of the most difficult technical challenges in hydraulic fracturing treatment. A three-dimensional non-linear fluid–solid coupling finite element model was established based on the finite element software ABAQUS. The staged fracturing process of a horizontal well in Daqing Oilfield, China was simulated with the model, in which perforation, wellbore, cement casing, one pay zone, two barriers, micro-annulus fracture and transverse fracture are included. The field data of Daqing Oilfield were used in numerical computation. Micro-annulus fracture and transverse fracture generate simultaneously and a typical T-shaped fracture occurs at the early stage of treatment history, then the micro-annulus disappears and only the transverse fracture remains and propagates. The pore pressure distribution in the formation and the fracture configuration during the …