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在高温高压气井或注蒸汽的热采井中,变温引起的温度应力(即热应力)将对套管接头的接触压力产生一定的影响,高温差引起的套管接头的接触压力分布变得更加不均,当温差达到一定值时,套管接头内的等效应力将接近材料的屈服强度,使螺纹接触处进入塑性变形状态,从而影响了套管接头的密封性。利用弹塑性有限元的方法,建立标准API偏梯形套管接头的有限元模型,分析温度改变对套管接头接触压力的影响,以及套管接头内等效应力的变化情况,提供一种温度对套管接头螺纹接触压力的分析方法,从而为高温井套管接头的安全使用提供一定的参考数据。
In high-temperature and high-pressure gas wells or steam-injected thermal wells, temperature stress (ie, thermal stress) caused by temperature change will exert an influence on the contact pressure of the bushing joint, and the contact pressure distribution of the bushing joint due to the high temperature difference becomes even more unfavorable Both, when the temperature difference reaches a certain value, the equivalent stress in the casing joint will approach the yield strength of the material, causing the thread contact place to enter the plastic deformation state, thus affecting the sealing of the casing joint. By using the method of elastic-plastic finite element method, the finite element model of standard API partial trapezoidal sleeve joint was established. The influence of temperature change on the contact pressure of the sleeve joint and the change of equivalent stress in the sleeve joint were analyzed to provide a temperature pair The method of analyzing the thread contact pressure of casing joint, so as to provide certain reference data for the safe use of casing joint of high temperature well.