| 摘要: |
| 塔河油田某注采井在修井起出管柱过程中发现油管柱出现了腐蚀穿孔和断脱。为了找到腐蚀失效原因,并采取针对性的防护措施保证井筒安全,通过对油管管材的理化性能测试、冲击性能测试、拉伸性能测试,结合扫描电子显微镜(SEM)、X射线衍射分析(XRD)等腐蚀特征及腐蚀产物表征分析方法,对井下管柱进行了腐蚀失效分析。结果 表明,油管腐蚀是由H2S-CO2-Cl--H2O体系引起的电化学腐蚀,以CO2腐蚀为主,同时存在H2S腐蚀,Cl-对腐蚀穿孔有一定的促进作用。建议添加缓蚀剂或对油管添加表面涂层、镀层、油管衬里,提高油管服役寿命。 |
| 关键词: 油管 CO2腐蚀 H2S腐蚀 穿孔 失效分析 |
| DOI：10.3969/j.issn.1007-3426.2019.04.012 |
| 分类号: |
| 基金项目:国家自然科学基金“静载、振动与腐蚀作用下H2S/CO2气井完井管柱螺纹密封面的力化学损伤机制研究”(51774249) |
|
| Corrosion failure analysis of production tubing of an injection well in Tahe oilfield |
|
Yao Bin1, Guo Yujie1, Zeng Wenguang1, Zhang Jiangjiang1, Zeng Feng2, Zeng Dezhi2
|
|
1. Petroleum Engineering Technology Research Institute, Northwest Oil Field Branch, Sinopec, Urumqi, Xinjiang, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China
|
| Abstract: |
| It is discovered that corrosion perforation and breakage of the tubing stringhappened in the process of well repair at an injection-production well in Tahe oilfield. In order to find out the cause of corrosion failure, and take specific protective measures to ensure the safety of wellhole, the corrosion failure analysis of downhole pipe string was carried out by means of physical and chemical test, impact test, tensile test, and combined with scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), characterization analysis of corrosion products. The results show that the corrosion of tubing is electrochemical corrosion which was caused by H2S-CO2-Cl--H2O system. The CO2 corrosion is dominant, and H2S corrosion exists at the same time. Cl- has a certain promoting effect on corrosion perforation. It suggests adding corrosion inhibitors or taking a surface coating, plating, and tubing lining to improve service life of oil pipe. |
| Key words: tubing CO2 corrosion H2S corrosion perforation failure analysis |
