水泥环传热特性对套管弹塑性损伤的影响规律研究  

Influence of heat transfer characteristics of cement sheath on casing elastoplastic damage

作　　者：郑华林[1] 毕圆圆[1] 刘少胡[2] 

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]长江大学机械工程学院,湖北荆州434023

出　　处：《塑性工程学报》2017年第2期155-159,186,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51604039);石油天然气装备教育部重点实验室项目(OGE210401-01);流体及动力机械教育部重点实验室开放课题(szjj2015-041);四川省教育厅自然科学基金重点资助项目(13ZA0178)

摘　　要：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 bearing capacity of casing is affected by the cement sheath circumferential discontinuity,and the heat transfer characteristics of cement materials have a major impact on the casing elastoplastic damage. A coupling system finite element model composed of casing,cement sheath with defects under different heat transfer properties and formation coupled system was established by using ABAQUS.The influence of heat transfer properties of cement materials,cement sheath circumferential discontinuity and temperature field on the elastoplastic damage of casing was studied. The result shows that the casing yield temperature is lower in integrity wellbore with a higher thermal conductivity cement sheath,the temperature is different for casing yielded in integrity wellbore and wellbore with defective cement sheath. Defective cement sheath leads to uneven temperature distribution and cement materials with higher heat transfer rate have a more uneven temperature field. The cement sheath circumferential discontinuity has a great influence on the plastic damage of casing,the increasing rate of plastic deformation for casing with low thermal conductivity is bigger.

关 键 词：弹塑性损伤 传热属性 水泥环 周向缺失 温度场 塑性变形 

分 类 号：TE248[石油与天然气工程—油气井工程]