为研究水平井多段多簇裂缝在割理发育的深部煤储层扩展情况，基于扩展有限元，考虑缝间干扰和诱导应力场，创建了多段多簇裂缝扩展模型；借助Python语言的前处理二次开发，在模型中加入大量近似正交的割理裂隙，分析了簇间距、压裂顺序和段间距对多裂缝扩展的影响，通过查询裂缝沟通割理组数，来验证压裂效果的优劣。模拟结果表明：簇间距在20 m，段间距控制在40~45 m时，裂缝沟通割理组数相对较多，且受到缝间干扰和诱导应力场影响较小，裂缝长度最优；在不同压裂顺序对多裂缝扩展的影响方面，压裂效果由优到劣排列为：顺序压裂>交替压裂>同步压裂；模型计算结果与现场应用吻合度较高，第2段压裂施工与模拟结果综合符合率为96.5%，第3段压裂施工与模拟结果综合符合率为93.4%。

In order to study the horizontal well multi-segment multi-cluster fracture extension in the deep coal reservoir where the cleat fissures are developed, a multi-segment multi-cluster fracture extension model is created based on the extended finite element and taking into account the inter-seam interference and the induced stress field. With the secondary development of pre-processing in Python language, a large number of approximately orthogonal cleat fissures were added into the model. The effects of cluster spacing, fracturing sequence and segment spacing on multi-fracture extension were analyzed, and the advantages and disadvantages of fracturing effect were verified by querying the number of fracture-communicating cutting groups. The simulation results show that when the cluster spacing is 20 m and the segment spacing is 40-45 m, the number of fracture communication cutting groups is relatively high, and the fracture length is optimal due to the small influence of inter-seam interference and induced stress field; at the aspect of the influence of different fracturing sequences on the extension of multi-fractures, the fracturing effects are ranked from excellent to poor: sequential fracturing > alternating fracturing > synchronous fracturing. The results of modeling and field application are in good agreement, with 96.5% for the second fracturing section and 93.4% for the third fracturing section.