Abstract:

To determine the location of fracture rupture point for horizontal wells and to guide the choice of preferred perforation location，a horizontal well fracturing stress field model has been established，which takes induced stress interference caused by open cracks and fitting the actual characteristics of horizontal well fracturing into account. On this basis，a rupture point optimization methods has be established combined with rock fracture criterion from an angle of lowering fracture pressure. The results show that the induced stress interference caused by cracks makes stress field around the horizontal wellbore more complex，so studying on the problem of fracture initiation this factor must be considered. This method was applied to staged fracturing for horizontal wells in western Sichuan. According to the result，the actual fracture gradient is lower than those of adjacent wells，which greatly reduced the construction risk. The breaking point optimization method has some guiding significance for the design of horizontal well fracturing.

Key words: perforated horizontal well, staged fracturing, induced stress field, rupture point optimization, field application