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Hydraulic fracturing technology has become indispensable for improving productivity in unconventional reservoirs. This research explores the fracture mechanisms of complex fracture networks (CFN) during the multistage fracturing process within reservoirs containing natural fractures (NFs) for carbonate reservoirs. Employing a two-dimensional plane strain model and numerical simulations, the study investigates various factors influencing CFN, encompassing different hydraulic fracturing scenarios, cluster spacing, strength weakening coefficient, and natural fracture angle. By incorporating global zero-thickness cohesive elements to characterize natural and hydraulic fractures. The simulation results indicate that when the perforation cluster spacing is 40 meters, the strength weakening coefficient is 0.45, and the natural fracture angle is 60°, each of these factors conducive to the uniform propagation of fractures in all clusters. In addition, the injection of temporarily plugging agents on the frature propagation is also studied, indicating the temporarily plugging staged fracturing (TPSF) can effectively reactivate suppression fractures and increase chances of uniform fracture propagation. The findings are beneficial for hydraulic fracture propagation under various conditions in natural fractured carbonates reservoirs and offer recommendations for efficient hydraulic fracturing treatment.

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Numerical Simulation of Hydraulic Fracture Propagation on the Horizontal Well in Fractured Carbonate Reservoirs

  • 会议论文

  • 发表日期：

    2025年

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  • Xiaoxin Ge,
  • Xian Shi,
  • Shu Jiang,
  • Guangyou Zhu,
  • Haijun Mao,
  • Jingshou Liu,
  • Hongjian Ni,
  • Lei Han

摘要

Hydraulic fracturing technology has become indispensable for improving productivity in unconventional reservoirs. This research explores the fracture mechanisms of complex fracture networks (CFN) during the multistage fracturing process within reservoirs containing natural fractures (NFs) for carbonate reservoirs. Employing a two-dimensional plane strain model and numerical simulations, the study investigates various factors influencing CFN, encompassing different hydraulic fracturing scenarios, cluster spacing, strength weakening coefficient, and natural fracture angle. By incorporating global zero-thickness cohesive elements to characterize natural and hydraulic fractures. The simulation results indicate that when the perforation cluster spacing is 40 meters, the strength weakening coefficient is 0.45, and the natural fracture angle is 60°, each of these factors conducive to the uniform propagation of fractures in all clusters. In addition, the injection of temporarily plugging agents on the frature propagation is also studied, indicating the temporarily plugging staged fracturing (TPSF) can effectively reactivate suppression fractures and increase chances of uniform fracture propagation. The findings are beneficial for hydraulic fracture propagation under various conditions in natural fractured carbonates reservoirs and offer recommendations for efficient hydraulic fracturing treatment.