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超深水水下分离器承压性能数值分析与试验研究
李秀美,陈国明,李伟,张慎颜,葛玖浩,刘秀全
0
(中国石油大学海洋油气装备与安全技术研究中心,山东青岛 266580)
摘要:
以中国自主设计制造的2000 m超深水水下分离器为研究对象,基于图算法和一致缺陷模态法分析分离器样机极限承载能力;建立包含嵌入式接管子模型的水下分离器精细数值模型,研究马鞍形焊缝应力分布规律;设计高压舱试验验证水下分离器样机的物理承压能力,并对比分析高压舱试验数据和数值计算结果。研究表明:水下分离器样机失稳模式为塑性失稳,下放工况应该主要评估其结构强度;接管马鞍形焊缝的鞍点和冠点以及N1接管焊缝的角度φ为45°和135°位置为应力特征点;试验样机在高压舱试验过程中整体应力水平处于线弹性变形阶段,能够满足2000 m水深的承压强度要求,模拟结果和试验结果吻合较好。
关键词:  超深水水下分离器  嵌入式接管  子模型  马鞍形焊缝  高压舱试验
DOI:10.3969/j.issn.1673-5005.2016.06.016
投稿时间:2016-04-22
基金项目:国家高技术研究发展计划项目(2013AA09A213);中央高校基本科研业务费专项 (14CX06123A);山东省自然科学基金联合专项(ZR2014EL018)
Numerical analysis and experimental study on pressure bearing performance of ultra-deepwater subsea separator
LI Xiumei,CHEN Guoming,LI Wei,ZHANG Shenyan,GE Jiuhao,LIU Xiuquan
(Centre for Offshore Engineering and Safety Technology in China University of Petroleum,Qingdao 266580, China)
Abstract:
With an independently designed 2000 m subsea separator as the research object, the ultimate bearing capacity of the separator prototype was analyzed based on the nomography method and the conformable imperfection mode method. A fine subsea separator numerical model containing embedded nozzle submodel was established to explore the stress distribution of saddle-shape weld. A hyperbaric chamber experiment was designed to validate the pressure-bearing performance of the subsea separator, and the experiment data were compared with the simulation data. Research results indicate that the instability mode of the separator is plastic instability and the structural strength should be assessed in the installation condition. The stress-characteristic locations are at the coronal and saddle points for saddle-shape weld in all nozzles and in the position of φ=45° and φ=135° for saddle-shape weld in nozzle N1. In the experiment, the overall stress level of the subsea separator is in an elastic deformation stage and the prototype can satisfy the pressure-bearing strength requirements at 2000 m water depth. The numerical analysis results are highly consistent with the experimental results.
Key words:  ultra-deepwater subsea separator  embedded nozzle  submodel  saddle-shape weld  hyperbaric chamber experiment