X100管线钢在微生物腐蚀环境下的延性裂纹止裂可靠性及失效分析  

Reliability Study and Failure Analysis of Ductile Crack Arrest of X100 Pipeline Steel in Microbial Corrosion Environment

作　　者：毕成 郑杰 郑泳[4,5] 杨旭 鲁元 BI Cheng;ZHENG Jie;ZHENG Yong;YANG Xu;LU Yuan(Xi'an Special Equipment Inspection Institute,Xi'an 710065,China;School of Mechanical Engineering,Xi'an Shiyou University,Xi'an 710065,China;School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China;Baoji Oilfield Machinery Co.,Ltd.,Baoji 721015,China;National Engineering Research Center for Oil&Gas Drilling Equipment,Baoji 721015,China)

机构地区：[1]西安特种设备检验检测院,西安710065 [2]西安石油大学机械工程学院,西安710065 [3]西北工业大学动力与能源学院,西安710072 [4]宝鸡石油机械有限责任公司,宝鸡721015 [5]中油国家油气钻井装备工程技术研究中心有限公司,宝鸡721015

出　　处：《科学技术与工程》2022年第11期4344-4349,共6页Science Technology and Engineering

基　　金：国家自然科学基金(52004215);国家质量监督检验检疫总局科技计划(2017QK069);陕西省市场监督管理局科技计划(2021KY12)。

摘　　要：基于管线钢的环向应力、断裂韧性及腐蚀速率,建立了天然气管线钢在微生物腐蚀环境下延性裂纹止裂可靠性的预测方法,获得不同微生物腐蚀速率对X100管线钢的止裂韧性和止裂可靠性随使用年限增长的变化规律。对X100管线钢延性裂纹扩展失效模式和强度失效模式进行了分析,并基于两种失效模式对X100管线钢的允许使用年限进行了预测,且强度失效所预测的管线钢使用年限要多于延性裂纹扩展失效得出的使用年限。结果表明X100管线钢的延性裂纹失效风险概率要高于强度失效,在进行安全评估时应优先考虑延性裂纹扩展导致的管线失效模式。A model of predicting the probability for the ductile fracture crack arrest within the natural gas pipeline under microbial corrosion environment was proposed as the functions of the circumferential stress,fracture toughness,and corrosion rate.The effect of the microbial corrosion rate on the crack arrest toughness and crack arrest probability with the increase of service duration was studied.Both the failure modes of the ductile fracture crack and stress failure in the X100 pipeline steel were analyzed.The service lives of the X100 pipeline steel were also predicted with the two failure modes,and the service life of the X100 pipeline steel predicted from the stress failure mode was longer than that from the ductile fracture crack failure mode.This result shows that the risk probability of the ductile crack failure in X100 pipeline steel is higher than that of the stress failure,and the ductile crack failure should be more concerned during the safety evaluation for the X100 pipeline steel.

关 键 词：X100管线钢 止裂 微生物腐蚀 失效分析 

分 类 号：TE372[石油与天然气工程—油气田开发工程]