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    鉆桿接頭螺紋卸扣扭矩影響因素研究

    Research on Factors Affecting Screw-off Torque of Drill Pipe Joint

    • 摘要: 研究鉆桿接頭上扣/卸扣扭矩的計算方法；根據(jù)計算公式，總結(jié)影響鉆桿接頭螺紋卸扣扭矩的因素；提出提高卸扣扭矩的建議。分析認(rèn)為：卸扣扭矩與上扣扭矩的比值R與螺紋導(dǎo)程有直接關(guān)系，同樣尺寸結(jié)構(gòu)設(shè)計的多線螺紋比單線螺紋的卸扣扭矩??；可通過減小螺紋導(dǎo)程、增加輔助扭矩結(jié)構(gòu)、提高螺紋脂摩擦因數(shù)和優(yōu)化錐度等手段，提高鉆桿接頭螺紋卸扣扭矩；建議特殊接頭螺紋的導(dǎo)程扭矩占比不高于0.16，R≥0.68。

       

      Abstract: Research is made on the method for calculating the screw-up torque and screw-off torque of drill pipe joint.According to relevant calculation formula,factors as affecting the screw-off torque of the drill pipe joint are summarized,based on which suggestion for increasing the screw-off torque is put forward. It is regarded via the analysis that R,the screw-off torque to screw-up torque ratio is directly related to thread lead. With the same dimensional structure,the screwof torque of the multi-line thread is smaller than that of the single-line thread. Accordingly the screw-off torque of the drill pipe joint can be increased by means of reducing the thread lead,increasing the auxiliary torque structure,increasing the friction factor of the thread compound,and optimizing the tamper,etc. Moreover it is suggested that the thread lead ratio of the premium connection be no more than 0.16,i.e.,R≥0.68.

       

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