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某直井发生接箍工厂端偏梯形特殊螺纹套管滑脱,下部套管柱落井未能打捞出。针对此起脱扣事故,采用理论与试验相结合的方法,对脱扣接箍的化学成分和力学性能进行了分析和测试,对同批次两组套管试样螺纹参数进行了测量和实物试验,另外对脱扣接箍工厂端和现场端以及同批次新接箍工厂端内螺纹承载面和导向面处显微组织进行了比较。结果表明,接箍工厂端上扣扭矩过小是导致套管脱扣失效的主要原因,同时文章也说明螺纹接触处的显微组织比较分析法是解决此类问题的一个重要手段。
A vertical shaft coupling plant factory side trapezoidal special threaded sleeve slippage, the lower part of the casing column failed to salvage. In response to this tripping accident, the chemical composition and mechanical properties of trip couplings were analyzed and tested by the combination of theory and test. The thread parameters of two sets of casing samples in the same batch were measured and measured In addition, comparison was made between the factory-side and the field-side of the tripping collar and on the thread-carrying surface at the factory end and the guide face at the new collar of the same lot. The results show that the over-torque on the coupling factory is the main reason for the failure of the casing tripping. The article also shows that comparative analysis of the microstructure at the thread contact is an important means to solve such problems.