摘要
海洋浮式平台面临台风等复杂的海洋环境条件,准确掌握浮式平台在役动力学状态,对保障平台在役安全具有重要意义。以半潜式平台——“深海一号”能源站为例,开展了环境特征和平台服役动力响应状态评估。基于现场风、浪、流环境监测数据,发现实测风速极值在0~5年回归周期内大于设计条件,5年及以上回归周期则小于设计条件;实测波高频率成分变化显著,固定波浪参数的设计环境条件难以反映波浪的时变特征;实测海流剖面各层流向不同,与传统均匀流、剪切流或梯度流的设计环境条件形式均不一致。进一步通过波浪荷载时频拟合方法,建立了在役浮式平台完整环境荷载矢量时程,通过全耦合动力学计算发现,相同环境条件下设计数值模型的平台运动幅值大于平台真实运动,其原因在于上部设施变动等因素导致了浮式平台的物理参数发生了改变。研究实现了对半潜式平台服役状态的有效评估,证明了“深海一号”能源站设计的安全性和合理性。研究结果为在役浮式平台现场安全保障运维提供了依据,并为未来浮式平台设计优化提供了参考。
Floating offshore platforms are encountered with complex marine environmental conditions.Accurately grasping the in-service dynamic response status of floating platforms is crucial for ensuring the long-term safety of the platforms.Taking the semi-submersible platform"Deep Sea No.1"energy station as an example,assessment has been conducted to evaluate its environmental characteristics and the in-service dynamic response status of the platform.Based on field monitoring data of the environment,including wind,wave and current,it is found that the monitored extreme value of wind speed exceeds the design conditions within the return periods of O to 5 years,but it falls below the design conditions in return periods of equal to or above 5 years;The measure waves of high-frequency components vary significantly,and it is difficult for the design environmental conditions with fixed wave parameters to reflect the time-varying characteristics of waves;Inconsistent flow direction of different monitoring current layers is revealed,which is different from the traditional design conditions of uniform flow,shear flow or gradient flow.Furthermore,a complete environmental load vector for the in-service floating platform was established based on the time-frequency fitting method for wave loads.By carrying out fully coupled dynamic calculations,it is found that the platform motion amplitude of design numerical model is greater than the actual motion of the platform under the same environmental condition.This discrepancy can be attributed to variations in physical parameters of the platform resulting from factors including modifications to the upper facilities.This study has effectively assessed the service status of the semi-submersible platform and verified the safety and rationality of the design of the"Deep Sea No.1"energy station.The results can provide a basis for ensuring filed safety and operational maintenance of in-service floating platforms,while also serve as a valuable reference for future design and optimization of floating platforms.
作者
徐化奎
吕柏呈
李达
XU Huakui;LYU Baicheng;LI Da(CNOOCChina Limited,Hainan Branch,Haikou,Hainan 570100,China;CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2024年第3期190-197,共8页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司综合科研项目“陵水半潜式生产平台研究专项(编号:LSZX2020HN01)”
中国博士后科学基金“基于现场监测的深水浮式平台实时安全评估方法研究(编号:2022M713496)”部分研究成果
关键词
半潜式平台
“深海一号”能源站
现场监测
环境评估
动力响应状态评估
semi-submersible platform
"Deep Sea No.1"energy station
field monitoring
environmental assessment
dynamic response status assessment
