Research On Risk Of Oil Gas Leakage And Explosion During Platform Dismantled

As the development of offshore oil and gas resources continues to enter the deep sea,a large number of old offshore platforms were gradually faced dismantling,and the market for dismantling abandoned platforms have huge potential for development in the foreseeable future.At present,there were larges number of jacket platforms in China's offshore areas that were facing dismantled operations.Among the large number of high-risk accidents that may occured during the dismantling platforms,the flammable gas explosion accident caused by leakage of residual oil and gas seriously endangers the life safety of operators and the safety of dismantling equipment.Therefore,risk analysis of oil gas leakage and explosion accidents during the dismantling platform have important practical value to ensure the smooth development of the dismantling operation.This paper takes a jacket platform as a case study object,reviewed and summarized the research status of offshore platform risk assessment methods,flammable gas leakage and explosion research status,and combined fuzzy fault tree method with event tree method to calculate the probability level of oil gas leakage and explosion during the platform dismantled.,Then used the sampling method to generate accident scenarios to analyze the consequences of leakage and explosion accidents,and proposed a set of risk assessment methods suitable for oil gas leakage and explosion during the dismantling of the platform.The main research work is as follows:?1?Combing and analyzing the research status of offshore platform risk analysis and combustible gas leakage and explosion in recent years,summarizing the key technologies in this risk assessment method and proposing a research framework.?2?According to the risk assessment framework,the system description and hazard source identification of the example jacket platform are carried out,the complex system in the platform oil gas treatment process is appropriately simplified,the high-risk deck area is determined as the main analysis object,and then the risk matrix is used The method performs a qualitative analysis of the main equipment and pipelines to screen and identify the main sources of danger.?3?The fuzzy fault tree method combined with expert judgment is used to calculate the probability of oil gas leakage during the dismantling of the platform,and the event tree method is used to obtain the probability of subsequent combustible gas explosion accidents the probability of explosion accident during the platform dismantling is2.732?10^-6.?4?Analyze the theoretical model and mechanism of combustible gas leakage and explosion,use the fluid dynamics software FLACS to study the numerical simulation process,and analyze the sensitivity of the factors affecting the residual oil gas leakage and explosion during the dismantling of the platform,and put forward a method for determining the volume and position of combustible gas cloud.?5?Based on the analysis of flammable gas leakage and explosion sensitivity parameters,a method for determining leakage scenarios is proposed.Latin hypercube sampling method is used to obtain 50 leakage scenarios;Numerical simulation and accident consequences of the50 leakage scenarios and subsequent explosion scenarios are respectively carried out According to the ALARP acceptance criteria,the quantitative risk assessment of oil gas leakage and explosion during the dismantling of the platform is carried out in terms of personnel and structure,and the results show that the risk level of residual oil gas leakage and explosion of the jacket platform dismantling in this paper is within an acceptable range,and then safety management and control measures are put forward from the aspects of preventing,controlling accidents and reducing the impact of accidents.further reduce the risk level of the accident.