中文摘要：

采用真三轴实验架，对岩样施加三轴应力，通过改变岩样中的射孔深度、射孔直径、射孔轴线和最大水平应力之间的夹角α等参数，考察了不同射孔参数条件下的起裂压力变化规律。结果表明，起裂压力随射孔深度和直径的增加而降低，随夹角α的增加而增加。实验结果可为水力射孔及压裂的现场施工提供参考。

英文摘要：

By using the real triaxial stress frame, the initial pressure changing laws were tested through exerting triaxial stress on the cement samples under different perforation parameters including perforation depth, perforation diameter and the angle of a between the hole axis and the maximum horizontal in-situ stress. The results show that the initial pressure decreases with the perforation depth and diameter increasing, while increases with the angle of α increasing. The conclusions can provide references for the field performance of hydrau-perforating and fracturing.