基于实验测试的完井管柱力学分析方法及应用

井筒温度效应对完井管柱力学性能会产生一定的影响,"三高"气井完井管柱力学完整性是保障气井安全高效开采的重要前提。为此,本文通过实验测试获取了不同材质管柱的力学性能随温度变化的真实值,将高温下管柱强度衰减率引入管柱力学分析中,以四川盆地两口"三高"气井为例对比分析了考虑温度效应和不考虑温度效应情况下完井管柱三轴力学安全系数变化情况。结果表明:110SS材质油管屈服强度平均衰减率为0.073%/℃,2532-110材质油管屈服强度平均衰减率为0.075%/℃;考虑温度效应后,完井管柱三轴安全系数会降低;选择钢级更高的完井管柱有助于抵消温度效应对管柱强度的影响。提出的考虑温度效应的完井管柱力学设计方法有助于保障"三高"气井完井管柱力学完整性。

A mechanical analysis method of the completion string considering the temperature effect and its application

The wellbore temperature effect would affect the mechanical properties of the completion string,the mechanical integrity of the completion string of"Three High"gas well is the prerequisite for safe and efficient production.This paper obtained the real mechanical properties of different material string on different temperature through the experimental test,and the strength attenuation rate was introduced into the mechanics analysis,the case study was conducted on two"Three High"gas wells in Sichuan basin,the triaxial safety factors considering the temperature effect and without considering the temperature effect were compared.The results showed that the average attenuation rate of the yield strength of the 110SS tubing is 0.073%/℃,and that of the 2532-110 tubing is 0.075%/℃.Considering the temperature effect,the triaxial safety factor of the completion string would decrease.Choosing the completion string with higher grade helps offset the effect of temperature on string strength.The proposed mechanical design method of the completion string considering the temperature effect is helpful to improve the mechanical integrity of the completion string.