부산대학교 도서관

Tight sandstone gas reservoirs are unconventional oil and gas resources with significant exploration and development potential. Hydraulic fracturing in horizontal wells is an effective method to enhance the productivity of these reservoirs. Multi-stage hydraulic fracturing in horizontal wells can create a stable network of primary fractures and fracture systems in low-permeability and homogeneous tight rock formations, successfully addressing issues such as low oil and gas production in tight reservoirs. However, in practical engineering, many of the perforations and fracture extensions in horizontal wells are ineffective, with some fractures deviating or even changing direction from their intended path. This study utilizes a finite element numerical simulation approach to investigate the fracture propagation behavior under different geological parameter conditions in this area. The results indicate that with a Poisson's ratio of 0.25 and an elastic modulus of 15 GPa, lower fracturing pressures and wider hydraulic fracture apertures are generated, which are beneficial for improving the effectiveness of hydraulic fracturing. The findings of this study will provide a scientific basis for the development of tight sandstone gas reservoirs in the Ordos Basin.