某区块油井套管腐蚀破坏机理及防护措施研究
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摘要
为了研究国内某区块油井套管破损的机理及防治措施,采用对比分析方法对油井采出水组分及油管内外壁腐蚀层、固井质量与套管破损失效模式进行了系统研究,并对J55钢在模拟工况环境中的腐蚀速率进行了测试试验。结果表明:该区块油井采出液CO_2含量高,且存在硫酸盐还原菌(SRB)及少量O_2,腐蚀产物含有FeCO3,腐蚀方式以CO_2为主,伴随有细菌腐蚀和微量的氧腐蚀;油管的外壁和套管的内壁所处介质相同,由油管外壁腐蚀严重,得出套管内壁的腐蚀也应严重,则套破主要由套管内腐蚀发生。在套管破损机理分析之上,针对性的筛选出了一种桐油咪唑啉缓蚀剂,对CO_2腐蚀控制提供理论依据。
In order to explore the damage mechanism and prevention measures of oil well casing in a certain block in China, a comparative study was carried out to systematically study the component of the oil well produced water and the corrosion layer,cementing quality and casing failure effect mode of the inner and outer wall of the oil pipe. At the same time, the corrosion rate of J55 steel in simulated working environment was tested. The results show that the CO_2 content of the oil wells produced fluid in this block is high,and there are sulfate-reducing bacteria(SRB) and a small amount of O_2. Corrosion products contain FeCO3, mainly CO_2 corrosion accompanied by bacterial corrosion and trace oxygen corrosion. The outer wall of the tubing and the inner wall of the casing are the same, and severe corrosion has occurred. Therefore, the corrosion damage of the casing is mainly caused by internal corrosion. Based on the analysis of casing corrosion damage mechanism, a tung oil imidazoline corrosion inhibitor was filtered out specifically to provide a theoretical basis for CO_2 corrosion control.
In order to explore the damage mechanism and prevention measures of oil well casing in a certain block in China, a comparative study was carried out to systematically study the component of the oil well produced water and the corrosion layer,cementing quality and casing failure effect mode of the inner and outer wall of the oil pipe. At the same time, the corrosion rate of J55 steel in simulated working environment was tested. The results show that the CO_2 content of the oil wells produced fluid in this block is high,and there are sulfate-reducing bacteria(SRB) and a small amount of O_2. Corrosion products contain FeCO3, mainly CO_2 corrosion accompanied by bacterial corrosion and trace oxygen corrosion. The outer wall of the tubing and the inner wall of the casing are the same, and severe corrosion has occurred. Therefore, the corrosion damage of the casing is mainly caused by internal corrosion. Based on the analysis of casing corrosion damage mechanism, a tung oil imidazoline corrosion inhibitor was filtered out specifically to provide a theoretical basis for CO_2 corrosion control.
引文
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[2]吴铭德,乔文孝,魏涛,等.油气井封固性测井述评[J].测井技术,2016,40(1):1-11.
[3]闫铁,李永祥,李静,等. CO2埋存井固井水泥环封存效果与其性能参数研究[J].科学技术与工程,2014(18):25-29.
[4] LI B,GUO B,LI H,et al. An analytical solution to simulate the effect of cement/formation stiffness on well integrity evaluation in carbon projects[J]. Journal of Gas Science and Engineering,2015(27):1092-1099.
[5] BAI M,SUN J,SONG K,et al. Evaluation of mechanical well integrity during CO2underground storage[J]. Environmental Earth Sciences,2015,73(11):6815-6825.
[6]袁青,刘音,毕研霞,等.油气田开发中CO2腐蚀机理及防腐方法研究进展[J].天然气与石油,2015,33(2):78-81.
[7] ZHANG G A,CHENG Y F. Localized corrosion of carbon steel in a CO2-saturated oilfield formation water[J].Electrochimica Acta,2010,56(3):15-18.
[8] ALSHAMARI A R,KUMAR G S,GUPTA A,et al. Choking of oxygen scavenger injection quills[C]//Corrosion 2014.Texas:NACE International,2014:3837.
[9] LI L,KHORSANDI S,JOHNS R T,et al. CO2enhanced oil recovery and storage using a gravity-enhanced process[J].International Journal of Greenhouse Gas Control,2015(42):502-515.
[10] LI L,KHORSANDI S,JOHNS R T,et al. Multiple-mixingcell method for three-hydrocarbon-phase-displacements[J].SPE J,2015, 20(6):1339-1349.
[11]刘伟,黄宪华,赵家宏,等.油井的腐蚀原因与防护措施[J].腐蚀科学与防护技术,2006,18(6):448-450.
[12]沈光霁,陈洪源,薛致远,等.管道涂层应用现状分析[J].腐蚀科学与防护技术,2013,25(3):246-249.
[13]张欢欢. CO2环境中钢表面状态对缓蚀剂缓蚀性能影响的研究[D].北京:北京科技大学,2017.
[14]杨帆,孟章进,吴伟林,等.溶解氧对油田污水腐蚀的影响及对策研究[J].复杂油气藏,2014(4):73-74.
[15]齐奉忠,刘硕琼,沈吉云.中国石油固井技术进展及发展建议[J].石油科技论坛,2017(1):26-31.