Evaluation of Fatigue Life of Large-scale Blowout Preventer Based on Stochastic Finite Element Method
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摘要: 防喷阀在实际工作中受到油井井口液体的高压随机冲击作用,常常因阀体疲劳而失效。针对大型单闸板防喷阀,实地采集和记录了防喷阀的工作压力和冲击次数等数据,记录观测了阀体疲劳裂纹的扩展过程,并讨论了阀体疲劳机理。考虑到阀体的工作载荷为随机载荷,将随机有限元方法引入阀体结构的疲劳寿命分析中,提出了随机载荷作用下的阀体疲劳寿命计算方法,实现了阀体总体寿命评估和阀体各部位疲劳寿命分布计算。Abstract: Blowout preventer valve in practical work suffers the random shocks of high-pressure liquid in the oil wellhead,and often fails to work due to fatigue failure.This work focused on a large-scale single ram blowout preventer valve,acquired and recorded the working pressure and impact frequency of the valve.The fatigue crack growth process was recorded and observed.The fatigue mechanism of the valve body was discussed.Considering that the work load of the valve body is random,the stochastic finite element method was introduced in the fatigue life analysis of the valve body.The calculation method for the valve body life under random load was proposed.The overall life evaluation and distribution of fatigue life of various parts of valve body are realized.
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Key words:
- blowout preventer valve /
- fatigue life /
- random load /
- stochastic finite element method
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