本文对V形圆扣套管联接强度失效的主要形式，即套管联接螺纹滑扣(或滑脱)失效的机理进行了分析研究。
The main failure form of V-round-thread casing, that is, the mechanism of thread connection slipping off, is analyzed in this paper.
为了克服剪钉式和反扣式两种安全接头的不足，研制出一种滑套式井下安全接头。
To overcome the shortcomings of the shear pin type joint and left-hand thread type joint, a sliding sleeve subsurface safety joint is developed.
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