《Table 2.Basic parameters of the reservoir model.》

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《"Optimization of refracturing timing for horizontal wells in tight oil reservoirs: A case study of Cretaceous Qingshankou Formation, Songliao Basin, NE China"》

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After the well with the highest refracturing potential was selected，a numerical model of reservoir considering the stress sensitive effect was established by using the ECLIPSE simulator.The model was 1 800 m×1 000 m×3.5 m in size and had18 000 grids with grid spacing of 10 m×10 m×3.5 m.Table 2shows the basic parameters of the model.The fracture parameters were obtained through inversion using the net pressure fitting method and then input to the numerical model using the local grid refinement method.Among these parameters，the fracture half-length was 100-354 m and the conductivity of the primary fractures was 18.6-35.4μm2?cm，which vary greatly across all fracturing intervals.In the initial fracturing，the designed fracture half-length and conductivity of initial fracturing were 300 m and 30μm2?cm respectively，suggesting that some hydraulic fractures failed to effectively communicate the reservoir to provide flow pathways，which significantly affected the actual productivity.