Study On Risk Evaluation Technology Of Gas Station In High Sulfur Gas Field

With the rapid development of high sulfur gas fields, gas gathering stations as the frist hub stations of all the natural gas pipeline transportation, the stations with all kind of pipelines and valves, there is an important part of gas gathering system of high sulfur gas fields and the main hub of gathering engineering. Due to the particularity of the stations which transportation medium is corrosive and toxic, there is a high risk place. Because the wells produced the high sulfur natural gas in the gas gathering stations in general no dehydration and desulfurization. Although the steel of sulfur resistance was used, in the long time high temperature and high pressure, high sulfur of equipments and pipelines of the gas gathering stations will be caused a certain degree of corrosion and damage, so the stations safety and stable operation play a key link in the production of the high sulfur gas fields. Therefore the research on risk assessment of high sulfur gas gathering stations can prevent and reduce safety accidents in gas gathering stations, and strengthen equipment management and maintenance of the stations, so it is an effective method to save operation cost.In this paper, the system of safety system engineering of analysis method of "the man-machine-environment", combined with the characteristics of high sulfur gas gathering stations, and high sulfur gas gathering stations will be divided into man subsystem, equipment subsystem and environment subsystem for a comprehensive analysis of the factors that influence the safety of the stations. Through high sulfur gas gathering stations fault statistics analysis will be divided into four blocks of the pressure vessel, pressure pipeline, valve, safety instrument, so that put to use fault tree analysis and establish index system. Using the improved grey analytic hierarchy process to determine the weight of risk factors and fuzzy comprehensive evaluation to calculate the likelihood of failure.The comprehensive evaluation result is mainly from three aspects of casualties, direct economic losses and intangible losses, based on the principle of division of API581risk matrix for risk level. According to the established risk assessment method of high sulfur gas gathering stations verify to the P302gas gathering station in the Puguang gas field. Thus become the theory and method of the high sulfur gas gathering stations in risk assessment.The main research results of this paper:first of all, the system of safety system engineering of analysis method of "the man-machine-environment" has introduced into the whole risk assessment system of gasgathering stations of high sulfur gas field to analyse of the risk factors for the station. Secondly, based on the grey theory and improved analytic hierarchy process to transform of traditional hierarchy analysis two aspects of comparison matrix and consistency, the formation of the improved grey analytic hierarchy process to determine the weight of risk factors, and it is the more scientific and reasonable. Finally, because the mixture of natural gas and H2S is transported in high sulfur gas gathering station, and refer to computational method of leakage potential influence areas in API581, so will convert the mixture into a single natural gas and H2S and calculate potential influence areas of the two kinds of gas, therefore the potential impact of the total area can be obtained by adding the single potential influence areas.