Study Of The Risk Assessment Technology For Buried Pipelines

Pipeline transportation has become the main way of oil and gas transportation because of its economic,safe and efficient characteristics.With the rapid development of the pipeline,the security problems have become increasingly prominent.Most of the oil and gas pipelines buried in the ground,as the different nature of the soil,complicated environment,running pressure and the high temperature pipeline failure accident occurred frequently.Once the pipeline leaks,easily lead fire or explosion and other accidents,causing serious damage to the surrounding environment.Risk assessment technology is an important means to prevent and predict the occurrence of accidents.The purpose is to identify the factors that affect the failure of the pipeline,analyze the possibility and consequences of pipeline failure,and determine the level of risk.Comprehensive comparison of risk mitigation measures to reduce the effect and the required input to the pipeline to take corrective measures to ensure the safe operation of the pipeline.Based on the characteristics of buried pipeline in China,this paper has established a comprehensive risk assessment method based on the domestic and foreign pipeline risk assessment theory and technology research,combined with domestic and foreign pipeline failure statistics data.Mainly include the following aspects:(1)The system analyses the national failure statistics data of oil and gas pipelines in the world currently and the data of Shengli Oilfield in the past 8 years,combining with the analysis of national conditions,analyzing the risk factors of buried pipeline in detail from third party damage,corrosion and misuse through the application of Fault Tree Analysis Method;clear the division rules of pipeline evaluation unit,in accordance with the regional level,soil type,coating level,durable years of pipeline,divide the pipeline reasonably to improve the accuracy of risk assessment.(2)Using the method of quantitative risk assessment to calculate the probability of pipeline failure by using fuzzy mathematics and expert scoring method.Determine the risk level of buried pipeline based on the failure probability and failure consequence of pipeline through the risk matrix method.Formulate the risk mitigation measures model combined with the probability of failure probability;formulate specific risk reduction measures for the basic events.(3)Through the example applications of the oil pipeline from Tuo 28 transfer station to STS2-X601 metering station,based on the experience of the Shengli Oilfield Technical Testing Center,introduce the test method of the coating and wall thickness.The relevant experimental research about the important factors affecting soil corrosion in buried pipeline is carried out to provide evidence for the quantitative analysis of the fault tree,and the corresponding suggestions are put forward for the rectification of the pipe section.