应用钻杆失效评估技术研究表明，横向材料冲击功大于80J将避免钻杆内螺纹接头纵向脆性开裂失效。
The drill pipe failure assessment demonstrates the longitudinal brittle fracture will be avoided when the transverse impact power of the material is over 80J.
虽然裂纹源很难避免，但如果能够阻止裂纹的扩展，也能够防止钻杆内螺纹接头纵向开裂失效。
Although it is hard to avoid the sources of fracture, the longitudinal fracture failure on the box joint can be prevented if proper measures are taken to prevent further extension of the fracture.
近年来由于深井、定向井等逐渐增多，油气井钻井中钻杆内螺纹接头纵向开裂失效成为常发事故。
Due to the increasing number of deep Wells and directional Wells being drilled, longitudinal fracture occurred on the box-ended drill pipe tool joint is often reported.
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