Stress interference of multiplied fractures has significant influences on the propagation\nbehavior of hydraulic fractures in roads, bridges, clay formations, and other forms of engineering. This\npaper establishes a crossing criterion and initiation angle model with comprehensive consideration of\nremote stress, stress intensity near the tip of fracture, and stress interference of multiplied fractures.\nCompared with the existing crossing criterion and initiation angle model, the ability to cross natural\nfractures decreases. Furthermore, the secondary initiation angle decreases with consideration of\nmultiplied fracture propagation. The length of hydraulic fractures and natural fractures has little\ninfluence on the secondary initiation angle. With the increase in fracture space, the stress interference\nbetween fractures decreases, and as a result, the initiation angle begins to increase and then decrease.\nDiffering from the propagation behavior of single fracture, the initiation angle basically does not vary\nwith the increasing of net pressure under the high intersection angle between hydraulic fractures and\nnatural fractures. Under a low intersection angle condition, the bigger the net pressure is, the smaller\nthe initiation angle is. These results have great significance when analyzing the propagation behavior\nof multiplied fractures in real-world applications.
Loading....