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针对非API套管接头的连接和密封性能提出一套完整的解析评估计算方法。首先建立具有密封和内外螺纹啮合结构的非API套管接头力学分析模型,依据API套管接头失效形式(螺纹跳扣、螺纹剪切破坏和接头断裂)及其机理结合弹塑性力学理论,推导出非API套管接头发生相应连接失效时的临界轴向载荷计算公式。然后,依据螺纹啮合对变形协调方程和单个螺纹牙轴向弹性变形分析,推导出套管接头螺纹牙啮合法向接触力计算方程组,从而获得非API套管接头各个螺纹牙轴向变形量及其承载轴向载荷分布情况数值解。最后,通过对比各个螺纹牙承载轴向载荷与连接失效临界载荷对非API套管接头进行连接性能评估;通过计算轴向载荷和气体内压作用下,套管接头螺纹轴向变形量及其对接头密封过盈配合值的影响,对非API套管接头进行密封性能评估。通过对3种典型非API套管接头完整性评估计算结果表明:在螺距、螺纹啮合中径、螺纹高度等螺纹参数相同情况下,非API套管接头的螺纹牙型设计参数(承载面角度与导向面角度)对其连接和密封性能影响显著。
A complete set of analytical evaluation methods is proposed for the connection and sealing performance of non-API bushings. Firstly, the mechanical analysis model of non-API bushing joint with seal and internal-external thread engagement structure was established. According to the failure modes of API bushing joint (thread buckle, thread shear failure and joint fracture) and its mechanism combined with elasto-plastic mechanics theory, Critical Axial Load Calculation Formula for Non-API Bushing Joints with Relevant Connection Failure. Then, based on the deformation coordination equation and the axial elastic deformation analysis of the single thread, the equations for calculating the normal contact force of the thread of the sleeve joint are derived, and the axial deformations of each thread of the non-API sleeve joint are obtained. The numerical solution of its axial load distribution. Finally, the connection performance of non-API bushing joints was evaluated by comparing the axial load of each thread and the critical load of connection failures. By calculating the axial load and the internal pressure of gas, Joint seal interference with the value of the impact of the non-API casing joint sealing performance assessment. Through the evaluation of the integrity of three kinds of typical non-API casing joints, the results show that the design parameters of the non-API casing joint with thread parameters (bearing surface angle and Guide surface angle) has significant influence on the connection and sealing performance.