To better evaluate the spatial steering effect of directional perforation hydraulic fractures, evaluation indexes for the spatial steering effect are first proposed in this paper. Then, these indexes are used to quantitatively evaluate existing physical experimental results. Finally, with the help of RFPA^2D-Flow software, the influence of perforation length and azimuth on the spatial steering process of hydraulic fracture are quantitatively analysed using four evaluation indexes. It is shown by the results that the spatial deflection trajectory, deflection distance, deflection angle and initiation pressure of hydraulic fractures can be used as quantitative evaluation indexes for the spatial steering effect of hydraulic fractures. The deflection paths of directional perforation hydraulic fractures are basically the same. They all gradually deflect to the maximum horizontal principal stress direction from the perforation hole and finally represent a double-wing bending fracture. The deflection distance, deflection angle and initiation pressure of hydraulic fractures increase gradually with increasing perforation azimuth, and the sensitivity of the deflection angle to the perforation azimuth of hydraulic fractures also increases. With increasing perforation length, the deflection distance of hydraulic fractures increases gradually. However, the deflection angle and initiation pressure decrease gradually, as does the sensitivity.

为了更好地评价定向射孔水力压裂裂缝的空间导向效果，本文首次提出了空间导向效果评价指标。然后，这些指标用于定量评估现有的物理实验结果。最后，借助RFPA ^2D-Flow软件，使用四个评估指标定量分析了射孔长度和方位角对水力压裂空间转向过程的影响。结果表明，水力裂缝的空间偏转轨迹，偏转距离，偏转角和初始压力可以作为水力裂缝空间转向效果的定量评价指标。定向射孔水力压裂的偏转路径基本相同。它们都从穿孔逐渐向最大水平主应力方向偏转，最终呈现出双翼弯曲断裂。水力压裂裂缝的偏转距离，偏转角和初始压力随着射孔方位角的增加而逐渐增大，偏转角对水力裂缝射孔方位的敏感性也增加。随着射孔长度的增加，水力裂缝的偏转距离逐渐增大。但是，偏转角和初始压力逐渐减小，灵敏度也逐渐减小。