[1]杨晓龙,田永强,王 旭,等.某N80油管接箍腐蚀断裂失效分析[J].焊管,2022,45(1):42-48.[doi:10.19291/j.cnki.1001-3938.2022.01.008]
 YANG Xiaolong,TIAN Yongqiang,WANG Xu,et al.Failure Analysis of Corrosion and Fracture of N80 Tubing Coupling[J].,2022,45(1):42-48.[doi:10.19291/j.cnki.1001-3938.2022.01.008]
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某N80油管接箍腐蚀断裂失效分析()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
45
期数:
2022年第1期
页码:
42-48
栏目:
失效分析
出版日期:
2022-01-28

文章信息/Info

Title:
Failure Analysis of Corrosion and Fracture of N80 Tubing Coupling
文章编号:
10.19291/j.cnki.1001-3938.2022.01.008
作者:
杨晓龙田永强王 旭岳 明何立军王佳伟赵立波田永吉
1. 国家石油天然气管材工程技术研究中心, 陕西 宝鸡721008; 2. 宝鸡石油钢管有限责任公司, 陕西 宝鸡721008; 3. 中国石油集团川庆钻探工程有限公司, 成都 610051;4. 中国石油天然气股份有限公司玉门油田分公司, 甘肃 酒泉 735019
Author(s):
YANG Xiaolong TIAN Yongqiang WANG Xu YUE Ming HE Lijun WANG Jiawei ZHAO Libo TIAN Yongji
1. Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods, Baoji 721008, Shaanxi, China; 2. Baoji Petroleum Steel Pipe Co., Ltd., Baoji 721008, Shaanxi, China; 3. CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China; 4. Petrochina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
关键词:
N80油管接箍SRB腐蚀失效分析缝隙腐蚀
Keywords:
N80 tubing coupling SRB corrosion failure analysis crevice corrosion
分类号:
TG172.2
DOI:
10.19291/j.cnki.1001-3938.2022.01.008
文献标志码:
B
摘要:
针对某N80 EU油管接箍腐蚀断裂的现象,通过宏观形貌分析、化学成分分析、金相及夹杂物分析、力学性能分析、扫描电镜和能谱分析、接箍螺纹结构分析,结合其服役工况,综合分析了其接箍腐蚀断裂的失效原因。结果表明:该失效接箍的化学成分、力学性能均符合相关标准要求,金相组织未见异常且无金属夹杂;其腐蚀是由内向外腐蚀,且以局部腐蚀为主,腐蚀产物是以铁的氧化物以及硫化物为主。该接箍失效原因是由于含有Cl-、CO2、SRB等腐蚀介质的井液在管柱内压作用下通过接箍中间缝隙进入齿顶和齿底的螺旋形泄露通道,在以缝隙腐蚀为主的腐蚀环境+轴向载荷共同作用下导致接箍断裂。建议优化螺纹结构,防止或减轻缝隙腐蚀对圆螺纹油管接头的影响,解决接箍腐蚀及断裂失效问题。
Abstract:
In view of the corrosion fracture of a N80 tubing coupling, the failure reasons of the corrosion fracture of the coupling are analyzed comprehensively through the analysis of its macroscopic morphology, chemical composition, metallography and inclusion, mechanical properties, SEM and energy spectrum, and the structure of the thread of the coupling. The results show that the chemical composition and mechanical properties of the failure coupling meet the requirements of relevant standards, and the metallographic structure is not abnormal and there is no metal inclusion; the corrosion is mainly from the inside to the outside, and the corrosion products are mainly iron oxides and sulfide. Under the action of internal pressure of pipe string, the well fluid containing Cl-, CO2 and SRB enters the screw leakage channel of the tooth top and the bottom through the gap between the coupling, and finally leads to the fracture of the coupling under the joint action of corrosion environment and axial load. It is suggested that the screw structure should be optimized, the influence of crevice corrosion on the round thread pipe joint should be prevented or reduced, and the corrosion and fracture failure of the coupling should be solved.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2021-10-11基金项目: 中国石油天然气集团有限公司科学研究与技术开发项目“高强度低密度油管与长寿命压裂泵关键部件研制”(项目编号2019B-4013)。作者简介:杨晓龙(1987—),男,高级工程师,主要从事油套管关键技术及特殊螺纹接头研究工作。
更新日期/Last Update: 2022-02-10