连续油管在酸性环境下的疲劳寿命研究进展
Progress on Researchin the Fatigue Life of the Coiled Tubing in Sour Service
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- 引用格式:
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鲜宁,张平,荣明,邹先雄,鲜林云.连续油管在酸性环境下的疲劳寿命研究进展[J].天然气与石油,2019,37(1):63-67.doi:10.3969/j.issn.1006-5539.2019.01.011
Xian Ning12 Zhang Ping3 Rong Ming2 Zou Xianxiong3 Xian Linyun.Progress on Researchin the Fatigue Life of the Coiled Tubing in Sour Service[J].Natural Gas and Oil,2019,37(1):63-67.doi:10.3969/j.issn.1006-5539.2019.01.011
- DOI:
- 10.3969/j.issn.1006-5539.2019.01.011
- 作者:
- 鲜 宁1,2 张 平3 荣 明2 邹先雄3 鲜林云4
Xian Ning12 Zhang Ping3 Rong Ming2 Zou Xianxiong3 Xian Linyun
- 作者单位:
- 1. 中国石油集团管力学与环境重点实验室四川分室, 2. 中国石油工程建设有限公司西南分公司3. 中国石油川庆钻探工程公司,4. 中国石油宝鸡石油钢管有限责任公司,
- 关键词:
- 连续油管;失效;腐蚀;疲劳;H2S
Coiled tubing; Failure; Corrosion; Fatigue; H2S
- 摘要:
- 在连续油管井下作业过程中，连续油管反复起下，产生低周弯曲疲劳，弯曲过程为塑性变形，这与常规静态管柱和输送管道弹性变形的受力特征存在明显差异。当连续油管用于酸性环境时，连续油管的H2S损伤和塑性变形相互作用，会进一步增加其失效风险。针对连续油管井下作业的特点，综述了连续油管在酸性环境下使用后产生的腐蚀疲劳失效机理、失效案例,介绍了酸性环境下连续油管腐蚀疲劳的试验方法及其试验原理,以及不同试验方法下的试验研究进展。结果显示,连续油管在酸性环境下应用,由于H2S引起的损伤,氢原子渗透进入管体导致材料变脆,塑性降低,使得连续油管弯曲疲劳寿命显著下降。对比分析了酸性环境下连续油管试验方法的优缺点,结合不同试验方法的试验研究成果,提出了连续油管在酸性环境下使用的注意事项和防护措施建议，以期为连续油管在酸性环境下井下作业的安全应用提供技术参考。
During coiled tubing(CT) well servicing operations performed in a well bore， the tubing string is subected to low bend cycle fatigue for rising and descending， and the bending process is a plastic deformation，which is quite different from the elastic deformation of the static tubing string and pipeline.
When CT is applied in sour service, it is subjected to higher risks of failure for interacting H2S damage and plastic deformation. The corrosion fatigue mechanisms and the failure cases of CT used in the sour well were reviewed in this paper,and corrosion fatigue test methods of CT and their advantages and disadvantages were introduced,and research progress by those methods were reviewed too.The test results show that the fatigue life of CT exposed to sour environment was decreased observably because the plastic properties of the tubing string was degraded for permeating hydrogen atom due to damages caused by H2S.To reduce the failure of CT and to increase the safety of CT well servicing operation, some notes and precautionary measures were proppsed when CT was applied in sour service.
