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大口径海底管道弯管对接疲劳分析
Fatigue analysis of tie-in construction for large-diameter subsea pipeline bends
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- DOI:
- 10.3969/j.issn.1001-2206.2025.S.002
- 作者:
- 张先锋
ZHANG Xianfeng
- 作者单位:
- 中石化石油工程设计有限公司, 山东东营 257026
Sinopec Petroleum Engineering Design Co. Ltd., Dongying 257026, China
- 关键词:
- 海底管道; 水平口对接; 疲劳; 水动力分析
subsea pipeline;tie-in;fatigue;hydrodynamic analysis
- 摘要:
- 对口作业是海底管道安装的重要环节，不仅作业难度大、持续时间长，且风险较高；当水平口对接位置为弯管时，难度进一步增大。为验证大口径海底管道弯管对接的可行性，并有效控制管道疲劳损伤，以某大口径海底管道弯管对接工程为例，提出一种基于双船协同作业的弯管对接施工技术方案。通过水动力分析软件MOSES，对施工船舶在设计海况下的运动响应进行分析，计算浮吊船在不同浪向下的响应幅值算子（RAO），明确船舶运动特性；在此基础上，针对管道安装、铺设后及运行3个阶段，按80%、10%和10%的比例考量疲劳寿命，借助OFFPIPE和ANSYS等软件，对安装过程中“管段1完成起吊作业后”和“管段1与管段2完成对接后”两个关键状态的疲劳损伤展开分析。分析结果验证了技术方案的可行性。研究发现，在海况温和的海域，海上弯管可作为路由转向的解决措施；合理选择施工作业窗口及施工船舶，可有效降低对口疲劳损伤。
Tie-in construction is a crucial process of subsea pipeline installation, involving significant operational challenges, long duration, and high risks. The challenge gets greater when the pipeline has a bend. In order to verify the feasibility of tie-in construction for a large-diameter pipeline with a bend and control the fatigue damage, a tie-in construction scheme for bends was proposed based on the collaborative operation of two lifting barges. Motion response of the barges under the designed sea conditions was analyzed with the hydrodynamic analysis tool MOSES to obtain the barge response amplitude operator (RAO) and determine the motion characteristics. A fatigue life split between operation, as laid, and installation of 80%, 10%, and 10% was considered. By means of OFFPIPE and ANSYS, the analysis was carried out on fatigue damage before and after tow segment pipelines jointed during installation. The feasibility of the proposed tie-in construction scheme was confirmed by the analysis results. It is concluded that sea bend can be used to change the subsea pipeline route direction in a mild sea area. Proper construction of windows and barges can effectively control fatigue damage.