中文摘要：

油套管特殊螺纹接头上扣扭矩及其构成对于提高接头结构完整性和密封完整性至关重要。在分析典型上扣扭矩曲线基础上,采用弹性力学厚壁圆筒理论和旋转台肩扭矩公式,建立了特殊螺纹接头上扣扭矩理论计算方法,研究了不同过盈量和螺纹脂摩擦系数对接头总上扣扭矩及其构成的影响规律。结果表明：过盈量和螺纹脂摩擦系数越大,总上扣扭矩越大;螺纹径向过盈量、密封面径向过盈量、螺纹脂摩擦系数越小,台肩面轴向过盈量越大,作用到台肩面扭矩与总扭矩比值越大。总体上,台肩扭矩比值主要受螺纹径向过盈量和台肩轴向过盈量控制,而螺纹脂摩擦系数主要影响总上扣扭矩。建议加强优化公差配合、提高接头加工精度、严格控制上扣圈数并注重优选螺纹脂。研究结果对于确定特殊螺纹接头合理上扣扭矩以及强度计算提供了理论依据。

英文摘要：

The makeup torque and its composition of premium threaded connections are of great importance for improving mechanical and sealing integrity of tubing and casing. On the basis of analysis on typical makeup torque vs. turns curve,the theoretical calculation method of makeup torque for premium threaded connections has been established with the elasticity mechanics theory of thick-wall cylinder and rotary shoulder torque formula. The influences of different interferences and thread compound friction coefficient on the total torque and the ratio of torque acting on shoulder to total torque has also been investigated and the results show that the larger the interferences and thread compound friction coefficient,the higher the total makeup torque. The smaller the thread tooth radial interference,sealing surface radial interference and thread compound friction coefficient or the larger of the shoulder axial interference,the higher the ratio of torque acting on shoulder to total torque. Generally,the ratio is mainly influenced by thread tooth radial interference and shoulder axial interference,while the thread compound friction coefficient mainly affects the total torque. We suggest that enhancement of tolerance matching be optimized,processing precision be improved,makeup turns be strictly controlled and attention to thread compound optimized should be carried out. The study results provide theoretical basis for determining reasonable makeup torque of premium threaded connections and calculating its strength.