塔河油田某稠油区高含CO2及H2S，某侧钻井在井下P110S 油管发生典型的断裂失效。为查明油管断裂原因，结合油管服役的井下工况条件，对断裂油管的化学成分、力学性能、金相组织、微观形貌进行测试及分析，对油管断裂部位的腐蚀产物进行了能谱分析。通过对断裂油管进行详细观测及试验分析，认为腐蚀是导致该井油管断裂的主要原因。通过对该侧钻井油管二种典型腐蚀特征的分析可知油管内壁以点状腐蚀为主，腐蚀机理为典型的CO2电化学腐蚀；外壁主要为一侧分布的沟槽状腐蚀及坑蚀，腐蚀机理为低pH 值酸液条件下的电化学腐蚀及缝隙腐蚀。针对上述典型腐蚀问题，提出了针对性预防油管腐蚀穿孔的措施。
In the heavy oil zone with high content of CO2 and H2S in Tahe Oilfield, a sidetrack tubing downhole of P110S had a typical fracture failure. In order to find out the fracture reasons, this paper combined the downhole tubing service working conditions to test and analyze the pipeline rupture in terms of chemical composition, mechanical properties, and microstructure morphology, and analyzed the energy spectrum characteristic of the corrosion products in the fracture site. It is recognized that the well tubing corrosion is the main reason of the fault. Through the analysis of two kinds of typical corrosion characteristics of the tubing sidetrack, it is recognized that the corrosion and pitting mechanism of the tubing wall is mainly a typical CO2 electrochemical corrosion, and that for the side wall of the groove-like distribution of corrosion and pitting, the corrosion mechanism is electrochemical corrosion and crevice corrosion in the condition of the acid with low pH. Targeted prevention measures are also proposed for pipeline corrosion perforation on typical corrosion issues.
[1] 唐世春, 张志宏, 张江江. 塔河油田点蚀测试及评价技术应用[J]. 科技 导报, 2013, 31(32): 42-48. Tang Shichun, Zhang Zhihong, Zhang Jiangjiang. Application of test and evaluation technology of pitting corrosion in Tahe Oilfield[J]. Science & Technology Review, 2013, 31(32): 42-48.
[2] 张江江, 张志宏, 羊东明, 等. 油气田地面集输碳钢管线内腐蚀检测技 术应用[J]. 材料导报, 2012, 26(S2): 118-122. Zhang Jiangjiang, Zhang Zhihong, Yang Dongming, et al. Corrosion detection technology for surface gathering carbon steel pipeline in oil and gas field[J]. Materials Review, 2012, 26 (S2): 118-122.
[3] 翁永基. 材料腐蚀通论——腐蚀科学与工程基础[M]. 北京: 石油工业 出版社, 2004: 30-50. Weng Yongji. Material corrosion general theory: Corrosion science and engineering foundation[M]. Beijing: Petroleum Industry Press, 2004: 30- 50.
[4] 万里平, 孟英峰, 梁生书. 油气田开发中的二氧化碳腐蚀及影响因素[J]. 全面腐蚀控制, 2003, 17(2): 15-17. Wan Liping, Meng Yingfeng, Liang Shengshu. Carbon dioxide corrosion and its influence factors in oil/gas field exploitation[J]. Total Corrosion, 2003, 17(2): 15-17.
[5] 闫伟, 邓金根, 董新亮, 等. 油管钢在CO2/H2S环境中的腐蚀产物及腐 蚀行为[J]. 腐蚀与防护, 2011, 32(3): 193-195. Yan Wei, Deng Jingen, Dong Xinliang, et al. Corrosion products and corrosion behavior of tubing steel in CO2/H2S environment[J]. Corrosion & Protection, 2011, 32(3): 193-195.
[6] 石鑫, 张志宏, 刘强,等. 塔河某单井管道频繁穿孔原因[J]. 油气储 运, 2011, 30(11): 848-850. Shi Xin, Zhang Zhihong, Liu Qiang, et al. Reason analysis on the corrosion to leak pipeline of well[J]. Oil & Gas Storage and Transportation, 2011, 30(11): 848-850.
[7] 王树涛, 郑新艳, 李明志, 等. 抗硫套管钢P110SS在高含H2S/CO2条 件下的硫化物应力腐蚀破裂敏感性[J]. 腐蚀与防护, 2013, 34(3): 189- 192. Wang Shutao, Zhen Xinyan, Li Minzhi, et al. Stress corrosion cracking sensitivity of sulfide-resistant csaing steel P110SS in hyperbaric H2S/ CO2 environments[J]. Corrosion & Protection, 2013, 34(3): 189-192.
[8] 张春颜, 钱文辉, 郑玉萍, 等. 深井油管CO2腐蚀规律及其应用研究[J]. 科技导报, 2012, 30(36): 47-51. Zhang Chunyan, Qian Wenhui, Zhen Yuping, et al. CO2 corrosion law and its applation to analysis of tubing in deep and super deep wells[J]. Science & Technology Review, 2012, 30 (36): 47-51.
[9] 郑华安, 闫化云, 佟琳, 等. 气举作业中连续油管腐蚀断裂原因[J]. 腐 蚀与防护, 2011, 32(9): 758-759. Zheng Huaan, Yan Huayun, Dong Lin, et al. Corrosion cracking csuse of coiled tubing in gas lift operation[J]. Corrosion & Protection, 2011, 32 (9): 758-759.
[10] 羊东明, 李亚光, 张江江, 等. 大涝坝气田油管腐蚀原因分析及治理 对策[J]. 石油钻探技术, 2011, 39(5): 81-84. Yang Dongming, Li Yaguang, Zhang Jiangjiang, et al. The corrosion evaluation of inter-station accompanying gas pipeline in Tahe Oilfield[J]. Petroleum Drilling Techniques, 2011, 39 (5): 81-84.
[11] 孙海礁, 叶帆. 塔河油田油套管内壁的腐蚀与防护[J]. 腐蚀与防护, 2010, 31(5): 383-386. Sun Haijiao, Ye Fan. Corrosion and protection of oil tubes inwall in Tahe Oilfield[J]. Corrosion & Protection, 2010, 31(5): 383-386.
[12] API Spec 5CT. Specification for casing and tubing[S]. Michigan: National Association of Corrosion Engineers, 2011: 2-11.
[13] 中华人民共和国国家质量监督检验检疫总局. GB/T 6394—2003: 金 属平均晶粒度测定方法[S]. 北京: 中华人民共和国国家质量监督检 验检疫总局, 2003: 4-9. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. GB/T 6394—2003: Metal-methods for estimating the average grain size[S]. Beijing: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, 2003: 4-9.
[14] 赵文娜, 王宇宾, 张烨. 高温地面交联酸体系研究及其现场应用[J]. 科学技术与工程, 2013, 13(8): 2191-2193. Zhao Wenna, Wang Yubin, Zhang Ye. Study and application of the ground cross-linked acid with high-temperature resistance [J]. Science Technology and Engineering, 2011, 32(3): 193-195.
[15] 曹楚南. 腐蚀电化学原理[M]. 北京: 化学工业出版社, 2004, 55-77. Cao Chunan. The corrosion electrochemistry principle[M]. Beijing: Chemical Industry Press, 2004, 55-77.
[16] 吴剑. 不锈钢的腐蚀破坏与防蚀技术——(二)缝隙腐蚀[J]. 腐蚀与防 护, 1997, 18(2): 41-48. Wu Jian. Corrosion damage and corrosion of stainless steel: (b) The crevice corrosion[J]. Corrosion & Protection, 1997, 18(2): 41-48.
