一例钻柱稳定器断裂原因分析及措施
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摘要
为防止类似南海西部油气田因稳定器断裂造成的钻井事故再次发生,确保钻井安全和作业时效。以该区块的某探井为例,对2起稳定器断裂事故进行了阐述。基于简支梁模型对钻柱"A-B"危险截面进行了受力分析,同时对试件宏观断口形貌与金相组织进行了观察。分析结果表明:切片金相组织符合原材料热处理工艺要求,螺纹牙底疲劳裂纹是造成稳定器断裂的根本原因。提出了增加稳定器打捞外径、肩部钎焊PDC齿2种方法,优化稳定器结构,改善稳定器承载能力。钻柱"A-B"截面交变应力破坏具有较大的风险,在设计中需要予以充分重视。
In order to prevent the drilling accidents caused by the fracture of stabilizer in the western South China Sea oil and gas fields and to ensure the safety of drilling operation, an exploratory well was taken as an example and two faults of stabilizer in the well were described. Based on the simple support beam model, the stress analysis of the "A-B" dangerous section of the drill string was analyzed while the macroscopic fracture morphology and metallographic structure of the sample were observed. The results show that the section of the metallographic tissue conforms to the requirements of the heat treatment process of raw materials. The fatigue crack on the bottom of screw thread is the fundamental cause of fracture of the stabilizer. Two improvement methods of the stabilizer structure and the carrying capacity of the stabilizer by increasing the diameter of the stabilizer and shoulder brazing at the PDC teeth were introduced.
In order to prevent the drilling accidents caused by the fracture of stabilizer in the western South China Sea oil and gas fields and to ensure the safety of drilling operation, an exploratory well was taken as an example and two faults of stabilizer in the well were described. Based on the simple support beam model, the stress analysis of the "A-B" dangerous section of the drill string was analyzed while the macroscopic fracture morphology and metallographic structure of the sample were observed. The results show that the section of the metallographic tissue conforms to the requirements of the heat treatment process of raw materials. The fatigue crack on the bottom of screw thread is the fundamental cause of fracture of the stabilizer. Two improvement methods of the stabilizer structure and the carrying capacity of the stabilizer by increasing the diameter of the stabilizer and shoulder brazing at the PDC teeth were introduced.
引文
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[2] 刘先富,梁奇敏,张翼.大尺寸井眼扶正器断裂问题分析与建议[J].石油机械,2017,45(2):32-34.
[3] 徐佩亮.钻进过程中稳定器母扣断裂浅析[J].化学工程与装备,2009(9):139-141.
[4] 贺林.深井稳定器失效分析及设计研究[D].成都:西南石油学院,2003.
[5] 李秀巧,赖清光,陈升,等.钻具稳定器的修理与应用[J].钻采工艺,2001,24(2):83-84.
[6] 崔崇刚,孔世森,李国滨.钻具稳定器的焊接修复[J].焊接,1998(3):25-26.
[7] 陈渝,何玉林,李明国,等.钻具稳定器的失效分析及应对措施[J].钻采工艺,2008,31(3):87-88.
[8] 刘鸿文.材料力学[M].北京:高等教育出版社,2006:142-143.
[9] 姜伟.深水钻完井技术理论与实践专集[C].北京:石油工业出版社,2015:29-41.
[10] 张鑫,何阳,和鹏飞,等.新型配切削齿扶正器在渤海油田的应用[J].科技创新与应用,2015 (33):122-124.
[11] 王玉山,朱益辉,刘禹铭,等.井下钻具扶正器:ZL201320692569.X[P].2013-11-05.