摘要
依照ISO 13679《套管和油管接头试验程序推荐作法》CALⅢC系热循环试验程序,采用Abaqus有限元分析软件,对JIP φ177.8mm×10.36mm规格P110钢级新型套管特殊螺纹的强度进行分析评价。考虑接触问题计算的非线性,建立了套管特殊螺纹热力耦合有限元模型,对接头的C系加载路径进行了简化,计算了接头在10个阶段的应力场与温度场耦合作用下的热应力。结果显示:随着温度由低温到高温的变化,特殊螺纹部分螺牙、接箍中面等塑性变形加大;而局部由于高、低温反复作用可能会产生组织的变化,使先前本应屈服的区域强度反而提高,但特殊螺纹整体上在C系加载完成后仍能保持结构完整;高温状态,材料的屈服强度降低,其变形更多的处于弹性变形阶段,室温状态时特殊螺纹的关键部位发生屈服的可能性更大。通过计算机仿真评价方法,按照ISO 13679的试验内容和程序对特殊螺纹进行评价,可以大幅节约时间与经济成本,可在一定程度上代替接头的实物评价。
In this paper,according to the 'ISO 13679-casing and tubing joint test procedure recommended practice' the C series thermal cycle test procedure,abaqus finite element analysis software was used to evaluate the strength of a new type of casing special joint JIP φ177.8 mm× 10.36 mm P110.Considering the nonlinearity of the calculation of the contact problem,a finite element model of the special joint of the casing is established.The C-loading path of the joint is simplified,and the thermal stress of the joint under the coupling of the stress field and the temperature field is calculated and analyzed.The results found in this research include:As the temperature changes from low temperature to high temperature,the plastic deformation of the joint part of the thread and the middle of the coupling increases,and the local and high temperature may cause the change of the organization structure due to the high and low temperature.But on the whole,after the completion of the C series thermal cycle test is completed to maintain the integrity of the structure.In the high temperature state,the yield strength of the material decreases,and its deformation is more in the elastic deformation stage.At room temperature,the key part of the special buckle is more likely to yield.It is recognized that proper computer simulation can be applied to effectively evaluate the gas-tight seal connections in accordance with test content and procedures of the ISO 13679,which greatly saves time and economic cost and can replace the evaluation on full-scale test of connections to a certain extent.
出处
《石油矿场机械》
2017年第6期40-46,共7页
Oil Field Equipment
基金
国家自然科学基金项目"膨胀套管螺纹连接几何
材料与接触非线性工作特性研究"(51074126)
陕西省教育厅项目"石油膨胀套管螺纹连接结构与密封完整性非线性数值模拟研究"(11JK0792)
关键词
套管
特殊螺纹
强度
热-力耦合
有限元
casing
premium joint
strength
thermo-mechanical coupling
finite element
