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井眼弯曲段的套管在承受常规载荷的同时还要承受弯矩载荷作用,因此导致弯曲段套管连接螺纹失效率较直井段要高,然而目前对套管连接螺纹在弯矩载荷作用下的力学行为认识尚不明确。针对该问题,该文基于虚功原理、接触非线性理论及Von Mises屈服准则,运用有限元分析软件建立并计算了弯矩载荷作用下套管连接螺纹的三维力学模型,获得了套管连接螺纹的应力分布规律,并用实验结果与数值模拟结果对比验证了模型的有效性;在此基础上对螺纹锥度、承载面角度、导向面角度、齿高及螺距五个螺纹参量进行了敏感性分析,最后总结了弯矩载荷作用下各螺纹参量对其应力分布的影响规律。该文的研究工作为套管偏梯形连接螺纹的优化设计提供了科学依据,对减少套管连接螺纹失效具有重要的工程价值。
The wellbore bending section of the casing to withstand the conventional load but also to withstand the bending moment load, resulting in the bending section casing connection thread failure rate is higher than the vertical well section, but at present the casing connection thread bending moment load The mechanical behavior of the understanding is not clear. In order to solve this problem, based on the principle of virtual work, contact nonlinear theory and Von Mises yield criterion, a three-dimensional mechanical model of the casing connecting thread under bending moment load was established and calculated by finite element analysis software. The stress distribution rule is verified, and the validity of the model is verified by comparing the experimental results with the numerical simulation results. Based on this, the sensitivity analysis of the five thread parameters of thread taper, bearing surface angle, guide surface angle, tooth height and pitch is carried out. Finally, the influence of each thread parameter on the stress distribution under the bending moment load is summarized. The research work in this paper provides a scientific basis for the optimal design of the bored trapezoidal connecting thread and has important engineering value for reducing the failure of the bushing connecting thread.