SIS Effectivity Assessment Of The Leakage Control In Offshore Oil Production Platform

Increasing energy demand has promoted the development of oil and natural gas production,and the focus of resource development has gradually shifted to the sea.The offshore production platform,as the carrier of offshore oil and gas production,has some typical characteristics,such as being far away from the land,dense equipment and poor working environment,and being prone to accidents with high probability.Once an accident occurs,the consequences will be serious and the rescue and escape are extremely difficult.Therefore,the systematic risk analysis of offshore oil production platform is of great significance.In this paper,taking an offshore production platform as the research object,an integrated risk analysis method combining HAZOP,FMECA and petri nets is proposed,which overcomes the limitations of a single risk analysis method and reduces the repeatability of analysis.This method can systematically identify the risks that exist in the process and equipment operation,analyze the consequences of leakage,the cause of the leakage,and the coupling relationship between them,and identify high-risk areas of the platform.Furthermore,to clarify the safety function requirements of offshore platform process safety instrument system.Safety Instrument System is the last active safety protection layer of the process.Whether it can act in the specified scene is of great importance.To evaluate the effectiveness of the safety barrier for the protection of leakage scenarios,HYSYS is used to dynamically simulate the parameter changes.Based on the statistics of leakage information of typical equipment,a failure database is established,which is applied to the integrity rating of SIS,and clarify SIL requirements of the platform.In the case of insufficient failure data of SIS components,a poordata Markov model is established for SIL verification.Besides,the SIL configuration rules,the impact of fault tolerance of the SIS and the sensitivity of the test strategy to the SIS are analyzed to provide optimization solutions for the overall safety instrumented system of the platform.In order to reduce the repetition and tedious calculation,using MATLAB GUI tool to develop SIL evaluation software,the functions of SIL grading,poor data verification,sensitivity analysis and so on are realized and proved to be practical,which can improve the efficiency and accuracy of evaluation.In order to overcome the limitation that the static risk assessment fails to consider that the accidents are dynamic,Bayesian analysis is used to study the dynamic changes of the response probability of SIS system control leakage,and quantitatively evaluate the dynamic probability of different risk scenarios caused by leakage.Providing references for operators to prepare for accident prevention.