FPSO Gas Leakage And Fire And Explosion Risk Assessment Research

As the exploitation of offshore oil and gas resources gradually moves towards the deep sea,complex and harsh operating conditions have placed higher demands on offshore platforms.FPSO(Floating Production Storage and Offloading Device)is a multifunctional offshore floating oil and gas production device that integrates production,oil storage and oil offloading.The complex structure of the upper module of the FPSO and the densely arranged equipment are prone to oil and gas leakage and explosion accidents,which in turn will cause significant damage to personnel,equipment structure and the environment.In this paper,the risk assessment of natural gas leakage and explosion hazards for the upper module of FPSO in an open environment has a certain guiding significance for actual engineering.A real ship model of FPSO was constructed,forming a complete set of risk assessment methods from natural gas leakage to ignition and explosion to structural response,combined with improved FMEA.The main contents are as follows:1.Evaluate the risk of fire and explosion caused by equipment failure of the FPSO platform.The traditional FMEA is improved based on the fuzzy entropy method and the multi-criteria decision-making method.The method combines the fuzzy Shannon entropy with the optimized fuzzy multi-attribute ideal real comparison analysis method(FMAIRCA).The fuzzy Shannon entropy is used to calculate the fuzzy relative importance of risk factors,and then the relative importance is used in the FMAIRCA method to sort according to the failure risk level.The feasibility of the FPSO fire and explosion risk assessment method is verified,and the results show that the method is comprehensive and has practical engineering guiding significance.2.Research on the natural gas leakage and diffusion process of the upper module of FPSO.Research the gas diffusion mechanism and diffusion model;use the CFD software FLACS to perform detailed modeling of the upper module of the FPSO real ship,carry out the numerical simulation analysis of natural gas leakage and diffusion,simulate the whole process of leakage and diffusion and summarize the rules,and propose a method to determine the dangerous area;Use the concept of equivalent gas cloud in FLACS to conduct sensitivity analysis on wind speed,wind direction,leakage factors,temperature and other parameters.3.Research the explosion process of natural gas cloud in the upper module of FPSO.Study the process and principle of combustible gas explosion,use FLACS software to simulate the MERGE test,compare the simulation results with the test results to verify the reliability of FLACS for explosion simulation;simulate the explosion process of the natural gas cloud on the upper module of the FPSO,and summarize the natural gas explosion The change process of the law and the overpressure curve;the parameter sensitivity analysis is carried out on the influence of the structural porosity,the equivalent gas cloud volume,and the position of the ignition source on the explosion overpressure.4.Research on the damage of the explosion overpressure to the deck structure.Ideally fit the explosion overpressure curve,use ABAQUS software to model the deck,study the damage caused by the explosion overpressure on the deck,and analyze the dynamic response process of the FPSO upper module process deck structure.