| Semi-submersible platforms are playing an increasingly important role in deep-sea exploitation of offshore oil and gas resources.However,semi-submersible platforms often face complex environmental loads challenges during their service.An intuitive understanding of the safety status of the semi-submersible platform under the impact of complex environmental loads and timely warning of danger is an important guarantee for the safety of the semisubmersible platform.This paper takes an ultra-deepwater semi-submersible production and storage platform in a gas field in the South China Sea as the research object.And the structural health monitoring system of deep water semi-submersible production and storage platform is studied,which provides an important guarantee for the operation safety of the semi-submersible platform and a reference for the construction of deepwater semi-submersible platform in China.The main studies are as follows:(1)Design of compound optimization scheme for selection of monitoring pointsThe design is suitable for the selection of structural health monitoring points for the deepwater semi-submersible production and storage platform,based on the analysis of the field experience of industry specifications and the orthogonal experimental design.And a compound optimization scheme for the selection of structural health monitoring points of semisubmersible production and storage oil platforms is formed.Taking an ultra-deepwater semisubmersible production and storage platform in the South China Sea as the research object.Firstly,according to the industry standards and field experience requirements,the monitoring positions are selected and the monitoring contents are determined.Then,through orthogonal experimental design,the high stress points and sensitive points in the relevant areas are selected as the structural health monitoring points.(2)Design of the structural stress acquisition system of the platformTaking the optimal sensor design,signal transmission path planning,signal analysis and system management into consideration,the overall scheme of structural stress acquisition of deepwater semi-submersible production and storage platform is proposed.The grating fiber optic sensor is optimized as the stress acquisition sensor of the platform structure,and different sensor layout schemes are designed based on the types of monitoring points,and the sensor protection technology is researched.Based on ant colony algorithm,the optical fiber routing path for signal transmission is planned.According to the position of sensor group and routing path,the hardware integration scheme of stress acquisition system is proposed based on layered integration strategy.(3)Study on data management strategy and analysis technologyIn order to facilitate data management,the monitoring database is designed based on SQL Server2019 through the analysis of monitoring data processing and storage requirements,and the data is stored in 14 data tables.By analyzing data transmission requirements,a data communication protocol is designed based on MOUDBUS RTU mode.The MATLAB calculation program was written,and the monitoring data were processed and calculated based on the ellipse relationship of rain flow counting method and considering the initial stress.(4)Development of monitoring and early warning systemComprehensive consideration of real-time monitoring and warning requirements,based on C# language and.NET framework,developing real-time monitoring and early warning system to real-time display platform structure health related to high stress,fatigue and arch sag information and real-time monitor high stress fatigue damage and early warning of relevant structures.According to different warning types and working conditions,the three-level and four-level warning evaluation criteria and warning thresholds are designed respectively.The historical information is retrieved from the database through time addressing.(5)Design of performance test experiment of monitoring and early warning systemThe performance test experiment of the monitoring and early warning system was designed,and the similarity ratio of the experimental model was determined.The experimental loading,constraint,spot placement and sensor layout were designed,and the feasibility of the experiment was verified by simulation. |
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