摘要
目前关于双金属衬里复合管的研究大多没有考虑现场制管时管端焊缝环的影响,且制管防腐工艺中材料的力学性能随温度变化,对双金属衬里复合管的紧密度也有重要影响。为此,建立了"两步法"双金属衬里复合管制管过程力学分析有限元模型,对制管过程中加压→泄压→升温→冷却阶段进行模拟仿真。分析结果表明:所建模型可以准确地模拟衬管-基管紧密度的变化过程;考虑焊缝的轴向相互耦合绑定约束关系模型与平面应变模型存在较大差异,绑定约束模型在加压过程中两种管材的管端同时缩短,会导致衬管和基管在接触前、后的径向变形行为发生变化,最终影响紧密度的大小和分布;紧密度随加载内压的增大而增大,两种材料膨胀系数差异越大,紧密度越小,适当增加内压并减小膨胀系数差异有助于提高紧密度。所得结果可为双金属衬里复合管的设计与应用提供参考。
At present,most of the current researches on bimetal-lined composite pipes do not consider the influence of the pipe end weld ring during the pipe making process,and the mechanical properties of the materials in the pipe making anticorrosion process change with temperature,presenting significant influence on the compactness of the bimetal-lined composite pipe.For this reason,a"two-step method"finite element model for the mechanics analysis of the bimetal-lined composite pipe making process is established to simulate the pressure loading-pressure releasing-heating-cooling stage of the pipe making process.The analysis results show that the model can accurately simulate the change process of the liner-base pipe compactness.Considering that the axially coupled binding constraint relationship model of the weld is quite different from the plane strain model,the pipe ends of the two pipes of the binding constraint model are shortened at the same time during the pressure loading process,which will cause changes in the radial deformation behavior of the liner and the base pipe before and after contact,and ultimately affect the compactness and its distribution.The compactness increases with the loading internal pressure.Greater difference in expansion coefficient between the two materials leads to smaller compactness.Appropriately increasing the internal pressure and reducing the difference in expansion coefficient will help improve compactness.The results obtained can provide references for the design and application of bimetal-lined composite pipes.
作者
陈俊文
于浩
张玉明
赵朝阳
于怀彬
李科
牟易升
Chen Junwen;Yu Hao;Zhang Yuming;Zhao Zhaoyang;Yu Huaibin;Li Ke;Mou Yisheng(Southwest Branch Company of China Petroleum Engineering&Construction Corporation;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Southwest Petroleum University;Engineering Research Institute,CNPC Bohai Drilling Engineering Company Limited)
出处
《石油机械》
北大核心
2021年第2期133-142,共10页
China Petroleum Machinery
基金
中石油CPECC资助项目“高腐蚀性气田用双金属衬里复合管应用技术研究”(CPECC2019KJ13)。
关键词
双金属衬里复合管
紧密度
加载内压
热膨胀系数
Tresca应力
制管模拟
bimetal-lined composite pipe
compactness
loading internal pressure
thermal expansion coefficient
Tresca stress
pipe making simulation
