【摘要】 针对气井广泛使用的特殊螺纹接头抗缝隙腐蚀能力较差的问题,对典型特殊螺纹接头的结构进行了优化设计,获得了一种能够抵抗缝隙腐蚀的新型螺纹接头结构。基于有限元方法,分析了A型接头在轴向拉力作用下密封性能和连接强度的变化,获得了影响A型接头连接强度和密封性能的因素;采用数值分析的方法,对接头的台肩角度、齿承载面角度、过渡锥面及副密封面尺寸等参数进行了优选。研究结果表明:最优参数组合为台肩角度60°、齿承载面角度2°、接箍副密封无过渡球面;优化前后的性能对比表明,优化后的接头结构可以在不降低接头连接强度的前提下提升接头的抗缝隙腐蚀能力。更多还原

【Abstract】 Aiming at the poor anti-crevice corrosion ability of special threaded joints widely used in gas wells, the structure of typical special threaded joints was optimized and a new type of threaded joints which can resist crevice corrosion was obtained. Based on the finite element method, the change of sealing performance and connection strength of A-type joint under axial tension was analyzed, and the factors affecting the joint strength and sealing performance were obtained. Through numerical analysis, the parameters of the joint such as shoulder angle, tooth bearing surface angle, transition cone surface and secondary sealing surface size were optimized. The results indicate that the optimal combination of parameters are shoulder angle of 60° and tooth bearing surface angle of 2° and coupling pair seal without transition spherical surface. The performance comparison before and after optimization indicate that the optimized joint structure can improve the crack corrosion resistance of the joint without reducing the joint strength.更多还原