随钻震击器在井下要承受较大的弯曲、扭转、压缩和冲击等载荷,工作条件非常恶劣。本文对英7井和塔东1井两起随钻震击器冲管体断裂事故进行了断口、金相、化学成份分析和机械性能试验,认为是脆性断裂。其主要原因是材料韧性太差,冲击功仅12J;结构不合理,导致应力集中所致。作者提出,对随钻震击器的生产,有关技术部门应进行技术认可,并对产品进行质量监督。 Drilling jars in the borehole to withstand greater bending, torsion, compression and impact and other loads, the working conditions are very poor. In this paper, fractures, metallurgical, chemical composition analysis and mechanical properties tests were carried out on two rupture tubes of drilling jars during the drilling of Well 7 and Tadong 1, which are considered to be brittle fracture. The main reason is the poor toughness of the material, the impact energy is only 12J; structure is irrational, resulting in stress concentration. The authors suggest that the relevant technical departments should make technical approval for the production of the rock drilling jars and conduct quality supervision on the products.