In the oriented perforation fracturing

current predicting initiation pressure just considers the naked borehole and neglects the effect of casing

which will lead to the greater errors in the engineering applications. Considering the effect of casing

wellbore stress models of directional well are obtained. According to tensile failure criteria

fracturing initiation pressure and angle models of oriented perforation well are presented. A software is developed

which includes the initiation prediction and perforation optimization of oriented perforation well. The software can predict the initiation pressure and initiation angle of oriented perforation fracturing considering the effect of casing

and optimize the perforation angle and length. Comparing to the actual initiation pressures

the maximum error of the prediction initiation pressures in the software is 4.33% and the predicting initiation angles are consistent with actual initiation angles

so as to prove the accuracy of fracturing initiation pressure and angle models. The models and software can offer instructions to the field fracturing and perforation optimization.