By analyzing the wind disaster of oil rigderrick, the basic reasons of the By analyzing normal work or falls in the service drilling machine derrick in oilfield were analyzed.
从石油井架风灾害分析入手，客观分析了油田在役钻机井架不能正常工作或倾倒的根本原因。
2
Making reliability appraisal for the on-site rigderrick is an important work to ensure salty in drilling.
对在用钻机井架的可靠性进行鉴定是保证钻井作业安全的一项重要工作。
3
Derrick is the main supporting parts of drilling rig. It bears much static and dynamic load under different conditions. So there are high requirements for design and performance of derrick.