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水泥环周向缺失致使套管承载能力受到影响,且水泥材料传热特性对套管弹塑性损伤有重要影响。运用ABAQUS建立了套管、不同传热属性含缺陷水泥环和地层耦合系统的有限元计算模型。研究了水泥材料传热属性、水泥环周向缺失开度、温度场对套管弹塑性损伤的影响规律。结果表明:热传导率较高的水泥材料下完整井筒套管屈服温度更低,完整井筒与水泥环周向缺失井筒套管屈服温度相差较大,水泥环缺陷导致温度分布不均且热传导率更高的水泥材料产生更为不均的温度场,水泥环周向缺失对套管塑性损伤影响很大,热传导率低的水泥材料使得套管的塑性变形增加率更大。
The circumferential loss of cement ring causes the bearing capacity of the casing to be affected, and the heat transfer characteristics of the cement material have an important influence on the elastoplastic damage of the casing. ABAQUS was used to establish the finite element model of casing, different heat transfer properties, including faulty cement sheath and formation coupling system. The influence of heat transfer property of cement material, the absence of cement sheath in circumferential direction and the temperature field on the elastoplastic damage of casing was studied. The results show that the yield temperature of the complete wellbore casing under the higher thermal conductivity is lower, the difference between the yield temperature of the wellbore casing and the casing casing around the cement sheath is large, and the defects of the cement sheath cause uneven temperature distribution and higher thermal conductivity Of the cement material produce more uneven temperature field, the circumferential loss of cement sheath has a great influence on the plasticity of the casing, and the cement material with low thermal conductivity makes the plastic deformation of the casing increase more greatly.