N80钢级平式油管断裂原因分析
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摘要
为找出修井时Φ73.02 mm×5.51 mm N80钢级平式油管工厂端螺纹根部断裂的原因,分析该油管的断口形貌、扫描电镜形貌以及宏观和微观组织,检测其机械性能,研究该油管的失效机理。试验结果表明:该失效油管材料的理化性能满足API Spec 5CT—2011标准对N80钢的要求;金相组织与油管断裂之间的关系很小;过扭矩上扣、油管柱倾斜以及无扶正器扶正的油管受到复合载荷振动和偏置应力,对油管螺纹断裂有一定的影响。
To find out the causes for the fracture at the factory-end thread root of the Φ73.02 mm ×5.51 mm N80 TBG tubing as occurred during the well workover, its fracture morphology, SEM morphology, and the macro/micro structures are analyzed,and its mechanical properties are tested so as to identify the mechanism of the said failure. The test results demonstrate that the physiochemical properties of the failed tubing are up to the requirements for N80 steel as specified under API Spec 5 CT—2011; the metallographic structure of the tubing has little relevance with the fracture;and that the fracture is to some extent associated with such elements as making-up with over torque,declination of the tubing string,and the combined loading and offset stress as imposed upon the tubing that is not supported with a centralizer.
To find out the causes for the fracture at the factory-end thread root of the Φ73.02 mm ×5.51 mm N80 TBG tubing as occurred during the well workover, its fracture morphology, SEM morphology, and the macro/micro structures are analyzed,and its mechanical properties are tested so as to identify the mechanism of the said failure. The test results demonstrate that the physiochemical properties of the failed tubing are up to the requirements for N80 steel as specified under API Spec 5 CT—2011; the metallographic structure of the tubing has little relevance with the fracture;and that the fracture is to some extent associated with such elements as making-up with over torque,declination of the tubing string,and the combined loading and offset stress as imposed upon the tubing that is not supported with a centralizer.
引文
[1]张毅,袁鹏斌,高连新.油井管失效分析[M].北京:石油工业出版社,2015.
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[7]崔旭明,何富君,张晶,等.油管的疲劳强度分析[J].实验力学,2004,19(1):72-78.
[8]杜秀华,张德文,李强,等.抽油机井油管疲劳断裂原因[J].大庆石油学院学报,2002,26(2):58-60.
[9]潘志勇,宋生印,王新虎,等.连续油管弯折和断裂原因分析及预防措施[J].钢管,2010,39(4):53-58.
[10]乔学华.Φ88.9 mm×6.45 mm 110S油管断裂原因分析[J].钢管,2013,42(5):61-65.
[11]张毅,陈建初. C-90油管失效分析[J].钢管,2003,32(3):43-47.
[12]刘鸿文.材料力学Ⅰ[M].北京:高等教育出版社,2004.
[13]李斐,路飞飞,王军,等.井口P110套管失效原因分析[J].钢管,2017,46(6):67-72.
[14]冯杰,马春莉,胡如意.Φ73.02 mm×5.51 mm N80平式油管断裂原因分析[J].钢管,2018,47(5):38-41.
[2]褚武扬,乔利杰,陈奇志,等.断裂与环境断裂[M].北京:科学出版社,2000.
[3] API标准翻译出版委员会. API Spec 5CT—2011套管和油管规范[S]. 9版.北京:石油工业标准化研究所,2011.
[4] Derek Hull.断口形貌学[M].北京:科学出版社,2009.
[5]钟群鹏,赵子华.断口学[M].北京:高等教育出版社,2006.
[6]航空航天工业部航空装备失效分析中心.金属材料断口分析及图谱[M].北京:科学出版社,1991.
[7]崔旭明,何富君,张晶,等.油管的疲劳强度分析[J].实验力学,2004,19(1):72-78.
[8]杜秀华,张德文,李强,等.抽油机井油管疲劳断裂原因[J].大庆石油学院学报,2002,26(2):58-60.
[9]潘志勇,宋生印,王新虎,等.连续油管弯折和断裂原因分析及预防措施[J].钢管,2010,39(4):53-58.
[10]乔学华.Φ88.9 mm×6.45 mm 110S油管断裂原因分析[J].钢管,2013,42(5):61-65.
[11]张毅,陈建初. C-90油管失效分析[J].钢管,2003,32(3):43-47.
[12]刘鸿文.材料力学Ⅰ[M].北京:高等教育出版社,2004.
[13]李斐,路飞飞,王军,等.井口P110套管失效原因分析[J].钢管,2017,46(6):67-72.
[14]冯杰,马春莉,胡如意.Φ73.02 mm×5.51 mm N80平式油管断裂原因分析[J].钢管,2018,47(5):38-41.