深海多工况下冲洗压力帽安全强度研究  

Safe Strength of Flooding Cap under Multi-load in Deepwater

作　　者：刘统亮 常户星 徐化奎 魏行超 张晨 冯定[3] LIU Tong-liang;CHANG Hu-xing;XU Hua-kui;WEI Xing-chao;ZHANG Chen;FENG Ding(CNOOC China Limited,Hainan Branch,Haikou 570300,China;Management School,Hainan University,Haikou 570100,China;School of Mechanical Engineering,Yangtze University,Jingzhou 434023,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海口570300 [2]海南大学管理学院,海口570100 [3]长江大学机械工程学院,荆州434023

出　　处：《科学技术与工程》2025年第10期4093-4101,共9页Science Technology and Engineering

基　　金：工业和信息化部高技术船舶与科研项目(MC-202030-H04);国家发展和改革委员会项目(LSZX-2020-HN-05);国家发展和改革委员会科技攻关项目(CCL2020HNFN0183)。

摘　　要：冲洗压力帽是海底管道预调试的关键性设备,其深海安装作业风险高、要求严,对结构强度的安全性能提出了更高的要求。冲洗压力帽除了在安装作业时承受载荷外,在试压过程中还需要封堵巨大的管道内压,其结构强度和承压能力直接影响到整个水下生产系统预调试的安全可靠性。以南海陵水海域1500 m水深气田使用的冲洗压力帽为研究对象,基于挪威船级社(Det Norske Veritas,DNV)和挪威石油工业NORSOK相关标准,对冲洗压力帽和关键承压部件进行弹塑性有限元建模,分析不同工况条件下安全强度要求。结果表明:吊装工况下冲洗压力帽各部件最大Von Mises应力均小于许用应力,且高应力主要集中在螺栓连接处;在冲击工况下冲洗压力帽模拟下放满足其0.5 m/s的速度安装要求,整体结构强度满足相关标准要求;在打压测试工况下计算得到冲洗压力帽承压能力为823 bar,南海陵水气田预调试作业时实测压力为268 bar,远小于其承压能力,满足有限元计算结果。研究结果可为冲洗压力帽设计和现场应用提供理论基础和技术参考。The flooding cap is the key equipment for the pre-commissioning of subsea pipeline.Its deep sea installation operation has high risks and strict requirements,which puts forward higher requirements for the safety performance of structural strength.In addition to bearing loads during installation,the flooding cap also needs to block huge internal pressure in the pipeline during pressure test.Its structural strength and bearing capacity directly affect the safety and reliability of the whole subsea production system pre-commissioning.The flooding cap used in a 1500 m deep gas field in the South China Sea Lingshui area was taken as the research object.Based on the relevant standards of DNV and NORSOK,elastoplastic finite element modeling of the flooding cap and key pressure components was carried out to analyze the safety strength requirements under different working conditions.The results show that the maximum Von Mises stress of each component of the flooding cap is less than the allowable stress under lifting conditions,and the high stress is mainly concentrated at the bolt connection.Under the impact condition,the flooding cap simulation can meet the installation speed requirement of 0.5 m/s,and the overall structural strength can meet the relevant standards.Under pressure testing conditions,the pressure capacity of the flooding cap is calculated to be 823 bar,and the measured pressure during the pre-commissioning operation of the Linsgshui gas field in the South China Sea is 268 bar,which is far less than its pressure capacity,satisfying the finite element calculation results.The relevant research results can provide theoretical basis and technical reference for the design and field application of flooding cap.

关 键 词：深海 复杂载荷 冲洗压力帽 安全性能 承压能力 

分 类 号：TE952[石油与天然气工程—石油机械设备]