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

Jianchun GUO,Liang TAO,Fanhui ZENG

Table 1 Parameter values for an ideal refracturing well.

Main criterion level Sub criterion level Distribution range of candidate wells Parameter value of ideal refracturing well Reservoir physical properties Oil-bearing sandstone length/m 240-1 880 1 880 Net pay thickness/m 2.3-6.3 6.3 Porosity/% 8.9-11.6 11.6 Permeability/10-3 μm2 0.44-2.31 2.31 Oil saturation/% 39-56 56 Initial completion efficiency Number of fracturing clusters 12-32 12 Fracture spacing/m 50-98 98 Fracturing fluid volume per cluster/m3 342-980 342 Proppant volume per cluster/m3 11-65 11 Production performance Current formation pressure/MPa 10.8-17.4 17.4