深水采油树井口连接器结构分析与测试验证

Deepwater X-Tree Wellhead Connector Structural Analysis and Validation Testing

为正确了解采油树井口连接器在复杂载荷条件下的性能表现,以自主研制的18-3/4"10K H4深水采油树井口连接器为研究对象,针对井口连接器的负载特性,对其结构进行弹性和弹塑性有限元分析,并测试验证其负载能力。结果表明:基于三维有限元分析的弹塑性分析结果可为井口连接器负载能力的测试验证和评估提供有效参考,测试中残余应力、拆卸检查和材料特性差异等因素对测试结果的一致性影响较大;井口连接器在69 MPa+1 300 kN+11 000 kN·m负载条件下的毂面分离距离为3.3 mm,未出现密封、功能或结构失效,其结构能满足设计载荷、作业水深和作业工况的需求。

The wellhead connector is a critical equipment that connects X-tree and wellhead.It is crucial to comprehend its performance under complex load conditions.Taking the independently developed 18-3/4"10K H4 deepwater X-tree wellhead connector as the research object.According to the load characteristics of the wellhead connector,the elastic and elastic-plastic finite element analysis of its structure was carried out,and the finite element analysis results were tested and verified.The test verification shows that the elastic-analysis results based on 3D FEA can provide an effective reference for test verification and evaluation of the connecter load capacity.During test,the residual stress,disassembly inspection and material property difference have a great impact on the consistency of the test result.The hub separation was 3.3 mm under 69 MPa+1300 kN+11000 kN·m load conditions,and there is no sealing,functional or structural failure,the structural capacity can meet the design load,operation depth and operating conditions.The analysis method,test procedure,result post-processing and related conclusions may provide methods,experience and data reference for the design and application of subsea wellhead connectors.