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.
针对倒扣式常规安全接头在井下退开难度较大，剪钉式安全接头完井作业易中途断脱的问题，研制了一种液压控制型安全接头。
To solve problems of difficultly releasing and easily breaking off of the conventional safety joint while operating in downhole, a new hydraulic controlling joint is developed.
对埋入式柱脚中抗剪栓钉的受力性能进行了分析和研究；根据试验结果，提出较为合理的计算方法。
This paper analyses and studies the function of shear bolt nails in imbedded heels under pressure. According to the experimental result, a more reasonable calculating method is raised.
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