某油田油井在实施侧钻过程中其井口放喷管线发生爆裂,通过宏观形貌观察、无损检测、化学成分分析、力学性能测试、断口形貌观察等方法以及爆裂放喷管线的抗内压强度校核,分析了该放喷管线发生爆裂的原因。结果表明:该放喷管线在本次使用前对存在轴向穿透裂纹的外壁进行过补焊处理,但补焊焊缝厚度很小,远小于管线壁厚,导致管线承压能力不足而在侧钻过程中发生爆裂失效,同时管线较差的韧性和冲击性能促进了脆性断裂的发生。

The choke line of an oil well in an oilfield bursted during the sidetracking process. The reason for bursting of the choke line was analyzed by macromorphology observation, non-destructive testing, chemical composition analysis, mechanical performance testing and fracture morphology observation, as well as internal pressure resistance checking of the burst choke line. The results show that before being used this time, the external wall of the choke pipeline with axial penetration cracks was repaired by welding treatment. The thickness of the repairing weld was very small, and much less than pipeline wall thickness, resulting in the bursting failure during sidetracking because of insufficient bearing capacity of the pipeline. Meanwhile, the poor toughness and impact performance of the pipeline promoted the occurrence of brittle fracture.