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<p>Previous studies on hydraulic fracturing focused on single-hole fracture propagation, limiting the understanding of multi-fracture interactions in multi-hole directional fracturing. Herein, we report a simplified perforation design to perform two-hole hydraulic fracturing tests on sandstone under various stress and hole angle conditions. The examined propagation process and interaction mechanism of fractures revealed four fracture propagation modes. (1) An angle of &lt; 30° between the two holes and the maximum principal stress exhibited the mode of one main fracture connecting two holes mode. (2) The one main fracture from a single-hole mode was formed when the hole angle was 60°, indicating it as the critical angle for transitioning from a two-hole connection to a single-hole propagation. (3) A hole angle of 90° converted the fracture mode from multiple fractures from two holes to the one transverse fracture from the bottom mode as the boundary maximum principal stress increased from 3 to 10 MPa. The stress condition and relative position of the two holes affected the coupling effect of the boundary and interference stress between holes, which ultimately dominated fracture formation. A hole angle of &lt; 60° indicated that the induced stress between the holes exhibited an attractive effect, and the fractures between holes showed a tendency to deflect to the adjacent holes. The boundary stress control effect is stronger at hole angle of 90°, fractures propagate more easily along the maximum principal stress direction, the induced stress between holes has a repulsive effect, and fractures between holes tend to propagate away from adjacent holes. When the formation stress difference was low, arranging multiple holes perpendicular to the maximum principal stress yielded optimal fracturing results.</p>

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Dynamic Stress Interference During the Propagation of Hydraulic Fractures Simultaneously Stimulated from Two Holes

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Luchao Wang,
  • Kang Duan,
  • Qifang Liu,
  • Qiangyong Zhang,
  • Rihua Jiang,
  • Xuejian Li

摘要

Previous studies on hydraulic fracturing focused on single-hole fracture propagation, limiting the understanding of multi-fracture interactions in multi-hole directional fracturing. Herein, we report a simplified perforation design to perform two-hole hydraulic fracturing tests on sandstone under various stress and hole angle conditions. The examined propagation process and interaction mechanism of fractures revealed four fracture propagation modes. (1) An angle of < 30° between the two holes and the maximum principal stress exhibited the mode of one main fracture connecting two holes mode. (2) The one main fracture from a single-hole mode was formed when the hole angle was 60°, indicating it as the critical angle for transitioning from a two-hole connection to a single-hole propagation. (3) A hole angle of 90° converted the fracture mode from multiple fractures from two holes to the one transverse fracture from the bottom mode as the boundary maximum principal stress increased from 3 to 10 MPa. The stress condition and relative position of the two holes affected the coupling effect of the boundary and interference stress between holes, which ultimately dominated fracture formation. A hole angle of < 60° indicated that the induced stress between the holes exhibited an attractive effect, and the fractures between holes showed a tendency to deflect to the adjacent holes. The boundary stress control effect is stronger at hole angle of 90°, fractures propagate more easily along the maximum principal stress direction, the induced stress between holes has a repulsive effect, and fractures between holes tend to propagate away from adjacent holes. When the formation stress difference was low, arranging multiple holes perpendicular to the maximum principal stress yielded optimal fracturing results.