油套管特殊螺纹接头密封结构弹塑性数值仿真与试验研究  

Elastic-plastic Numerical Simulation and Experimental Research on the Sealing Structure of Special Threaded Joints

作　　者：晁利宁 李远征[1,2,3] 张艺杰 周新义[1,2] 杨晓龙 汪强 唐家睿[1,2] CHAO Lining;LI Yuanzheng;ZHANG Yijie;ZHOU Xinyi;YANG Xiaolong;WANG Qiang;TANG Jiarui(Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods,Xi′an,Shaanxi 710018,China;Baoji Petroleum Steel Pipe Co.Ltd.,Baoji,Shaanxi 721008,China;Iron and Steel Research Institute,Beijing 100094,China;PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710018,China)

机构地区：[1]中油国家石油天然气管材工程技术研究中心有限公司,陕西西安710018 [2]宝鸡石油钢管有限责任公司,陕西宝鸡721008 [3]钢铁研究总院工程用钢研究院,北京100094 [4]中国石油天然气股份有限公司长庆油田分公司,陕西西安710018

出　　处：《石油管材与仪器》2024年第4期42-47,I0002,共7页Petroleum Tubular Goods & Instruments

基　　金：陕西省重点研发项目“非常规油气开采用特殊螺纹套管关键技术研究”(编号:2022GY-132);中国石油天然气集团公司“十三五”重大科技专项“自动化与高效钻完井新装备新工具研制”(编号:2019B-4013)。

摘　　要：薄壁油套管特殊螺纹加工时的管端厚度和“黑皮扣”是影响螺纹连接强度和加工效率的因素之一。应用大型通用有限元软件ABAQUS,针对薄壁油套管特殊螺纹接头管端缩口和未缩口以及中径位置调整后的密封性能进行弹塑性分析,建立了不同复合载荷条件下,中径位置优化前后结构以及缩口工艺与密封面接触压力之间的对应关系。结果表明,上扣后,结构优化前后的接触压力相差不大,压缩时,优化后的结构密封面上最大接触压力降低,接触长度增加,整个密封面上各点压力趋于平缓;而在拉伸时,优化后结构密封面上接触压力升高,分布均匀,接触长度增加,拉伸性能相对更好。缩口后的最大接触压力与未缩口时相当,但是接触长度增加,降低泄漏风险。经过试验验证,优化后的结构经过缩口,提高了管体的加工成材率,并且保证了气密封性能和螺纹连接强度,与模拟结果一致。The thickness of the pipe end and the"black crested thread"during the special thread machining of thin-walled casing were two of the factors that affect the strength of the thread connection and machining efficiency.This paper applied the finite element software ABAQUS to conduct elastic-plastic analysis on the sealing performance of thin-walled casing special threaded joint with pipe end necking and non necking,as well as adjustment of pitch diameter position.The corresponding relationship between the structure before and after optimizing the pitch diameter position as well as the shrinkage process and the contact pressure of the sealing surface was established under different composite load conditions.The results showed that after make-up,there was not much difference in contact pressure before and after structural optimization.When compressed,the maximum contact stress on the optimized structural sealing surface decreased,the contact length increased,and the stress at each point on the entire sealing surface tended to be flat.During stretching,the optimized structural sealing surface showed an increase in contact stress,uniform distribution,increased contact length,and relatively better tensile performance.The maximum contact stress after necking was equivalent to that without necking,but the contact length increased,reducing the risk of leakage.The experiment results verified that the optimized structure being necked improved the processing yield of the pipe body and ensured the gas sealing performance and thread connection strength,which was consistent with the simulation results.

关 键 词：特殊螺纹接头 密封面 有限元 台肩结构 试验研究 

分 类 号：TG404[金属学及工艺—焊接]