| Subsea blowout preventer system is a key equipment to ensure the safety and reliability of deep-water oil drilling and recovery operations.It will bring huge economic losses if it needs downtime maintenance due to faults,while disastrous consequences caused by blowout out of control may emerge with extremely large possibility because of safety function failures.So far,the design and manufacture technologies of subsea blowout preventer system are monopolized by foreign countries.The research works of design and manufacture,reliability and safety integrity evaluation etc.of subsea blowout preventer system are currently the improtant research hotspot in offshore oil and gas industry.This paper's research group cooperating with Rongsheng machinery manufacture Ltd.of Huabei oilfield revolved around the newly developed subsea blowout preventer system,focusing on the reliability test and analysis for hydraulic component of subsea blowout preventer system and safety integrity level validation of subsea blowout preventer stack electronic control system studies,and obtained the following innovative achievements:1)Reliability test outlines,test schemes,test procedures were compiled according to correlative reliability test standards,while reliability tests and failure information statistic for test samples were completed based on them.Research on statistical inference theories suitable for test data with small sample characteristic were carried out,such as life distribution goodness-of-fit test and distribution parameter estimation,etc.,and the point estimation and interval estimation of mean lifetime for DDV valves,SPM valves were obtained.2)Research on IEC 61508 and IEC 61511 standards,common safety integrity calculation models,such as Markov model,reliability block diagram,fault tree analysis,etc.were carried out.A simplified configuration schematic and its corresponding reliability block diagram for triple modular redundancy electronic control system were given on the basis of mastering its operational principle,then SIL modelling,SIL validation for electronic control system and influence analysis of proof test interval,channel failure rate and maintenance time to electronic control system performance were completed.3)A new safety integration level calculation method based on multi-phase dynamic Bayesian network was proposed.Network structures and its node conditional probability tables of dynamic Bayesian network model in proof test phase and proof test interval phase were built,respectively.Influence laws of time-span and common cause weight on model accuracy of multi-phase dynamic Bayesian network for safety instrumented system with different architectures,and imperfect proof test and maintenance on safety instrumented system performance were studied and obtained with Bayesian network toolbox.4)According to software development process,a blowout preventer system evaluation software with wieldy and user-friendly interface was developed using graphical user interface development environment of matlab,which was equipped with reliability test data statistical inferences for subsea blowout preventer system hydraulic components and safety integrity level validation for subsea blowout preventer stacks electronic control system functions. |
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