Risk Assessment And Study On Leakage Consequences Of FPSO Upper Module

In order to ensure national energy strategic security,China’s domestic oil industry continues to increase its efforts in oil and gas exploration development and production facing the dual challenges of the Covid-19 epidemic and ultra-low oil prices.Floating Production Storage and Offloading Units(FPSO),based on abundant offshore oil and gas resources,have the advantages of strong oil storage and unloading capacity,excellent mobility and migration,etc,and have a high development prospect in oil and gas development.However,the harsh operating environment and the intensive arrangement of the upper modules make oil and gas leakage and fire and explosion a major threat to the FPSO oil and gas development.Combined with the development background of FPSO,the subject carried out simulation and consequence risk assessment on the phenomenon of combustible gas leakage and explosion in the upper module.Based on the evaluation results,the combustible gas safety barrier system and accident emergency rescue model were established.The research results provide theoretical support and technical support for the establishment of FPSO risk assessment system and emergency management system.This article first systematically introduces the composition and working principle of the upper module of FPSO,summarizes the main risk assessment methods at this stage,and proposes an improved FMEA analysis method based on the logical structure number,and applies this method to the upper module equipment.Risk analysis,according to the analysis results,identified the leaking equipment.Then,by establishing the FPSO leakage diffusion model,combining with the actual FPSO project,16 groups of study conditions and 1 group of control conditions were established to simulate the leakage and diffusion characteristics of combustible gas,and the FPSO gas leakage laws under different scenarios were obtained,and the upper module of the FPSO was combustible.Determination of the most dangerous scenarios for gas leakage.By inputting the effective data of dangerous scenes as parameters into FLACS,the characteristics of combustible gas leakage and explosion were analyzed,and the law of overpressure and temperature distribution of combustible gas leakage and deflagration was explored.The thermal-mechanical coupling analysis model of FPSO upper module equipment was established through ABAQUS,and high temperature,the impact of high pressure on the performance of flammable gas leakage equipment,and quantitatively evaluate the impact of oil and gas deflagration on accident hazards.Finally,combined with the calculation results of frequency analysis and consequence analysis,the calculation of FPSO equipment risk and personal risk is completed,and the ALARP risk acceptance criterion is used to check the risk value,and the risk assessment of the explosion consequences is carried out according to the accident evolution law and the risk assessment result.Corresponding safety barriers and emergency rescue models have been established to reduce the risk of flammable gas leakage and explosion in the upper module of FPSO.