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 CO2 content of the oil wells produced fluid in this block is high,and there are sulfate-reducing bacteria(SRB)and a small amount of O2.Corrosion products contain FeCO3,mainly CO2 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 CO2 corrosion control.
作者
吕祥鸿
闫亚丽
王悦
LV Xianghong;YAN Yali;WANG Yue(School of Material Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)
出处
《焊管》
2019年第1期10-16,共7页
Welded Pipe and Tube
基金
陕西省自然科学基础研究计划"高含H2S/CO2苛刻环境钛合金管材的耐蚀机理研究"(项目编号2016JM5064)
陕西省自然科学基金一般项目青年项目"Al掺杂FeMn/TiN纳米涂层的相变行为和强韧化机理研究"(项目编号2018JQ5108)
西安石油大学<材料科学与工程>省级优势学科(YS37020203)
关键词
油套管
套破损坏
J55钢
CO2腐蚀
缓蚀剂
oil casing
casing corrosion damage
J55 steel
CO2 corrosion
corrosion inhibitor
