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闸板防喷器顶部密封损坏对接触密封的影响

Influence of Top Seal Damage on Contact Seal in Ram Blowout Preventer.

作者信息

Wang Shiqiang, Zhang Laibin, Yu Jiamin, Fan Jianchun

机构信息

College of Safety and Ocean Engineering, China University of Petroleum (Beijing), Beijing 100100, China.

Research Institute of Safety, Environmental Protection and Quality Supervision and Inspection, Chuanqing Drilling Engineering Co., Ltd., Guanghan 618300, China.

出版信息

Materials (Basel). 2023 Apr 27;16(9):3413. doi: 10.3390/ma16093413.

DOI:10.3390/ma16093413
PMID:37176296
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10179920/
Abstract

Top seal failure of ram blowout preventer (BOP) is one of the main factors leading to well control risk. The constitutive model and parameters of nitrile butadiene rubber (NBR) were optimized by compression and tensile tests, and the failure analysis model of the contact seal of the ram BOP top seal was built. The nonlinear contact mechanical behavior of the connection part of the BOP top seal was analyzed by the finite element method. Then, the influence of corrosion and wear defects at the top seal position of the 2FZ35-70 BOP under rated working pressure on the contact seal were studied, and the results showed that the overall contact pressure distribution of the top seal corrosion defects was uniform, the local contact pressure of the corrosion pit edge increased, and the top contact pressure decreased. The overall contact pressure of the wear defect of the top seal decreased linearly, the contact pressure at the maximum depth of the wear defect was the smallest, and the contact pressure gradually decreased to both sides. Ultimately, to guarantee the safety and reliability of the ram BOP, it is suggested that the acceptable depths of the seal corrosion pit and the wear at the top of the ram BOP are 4.0 mm and 0.2 mm, respectively, thus the reliability evaluation problem of the quantitative seal of the ram BOP top seal is solved.

摘要

闸板防喷器（BOP）顶部密封失效是导致井控风险的主要因素之一。通过压缩和拉伸试验对丁腈橡胶（NBR）的本构模型和参数进行了优化，并建立了闸板防喷器顶部密封接触密封的失效分析模型。采用有限元方法分析了防喷器顶部密封连接部位的非线性接触力学行为。然后，研究了额定工作压力下2FZ35 - 70型防喷器顶部密封位置的腐蚀和磨损缺陷对接触密封的影响，结果表明，顶部密封腐蚀缺陷的整体接触压力分布均匀，腐蚀坑边缘局部接触压力增大，顶部接触压力减小。顶部密封磨损缺陷的整体接触压力呈线性下降，磨损缺陷最大深度处的接触压力最小，向两侧逐渐减小。最终，为保证闸板防喷器的安全可靠性，建议闸板防喷器密封腐蚀坑和顶部磨损的可接受深度分别为4.0 mm和0.2 mm，从而解决了闸板防喷器顶部密封定量密封的可靠性评估问题。

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