焊管2025，Vol.48Issue(4)：31-37,7.DOI:10.19291/j.cnki.1001-3938.2025.04.005
不同气侵工况下油井用水基环空保护液缓蚀性能研究
Study on Corrosion Inhibition Performance of Water-based Annular Air Protection Fluid in Oil Wells under Different Gas Intrusion Conditions
摘要
Abstract
To investigate the corrosion inhibition performance and mechanisms of water-based annular protection fluids on J55 casing and tubing under various gas invasion conditions,a series of corrosion experimentswere conducted.By simulating tubing-casing annulus under nitrogen(N2)environment and three different gas invasion conditions(CO2/O2/CO2+O2 mixture),the corrosion behavior of the annular protection fluids were analyzed.The results demonstrated that the corrosion inhibition rate of the annular protection fluid reached 79.1%under N2 environments.However,when subjected to gas invasion conditions involving CO2,CO2+O2,or pure O2,the corrosion inhibition rate were 75.2%,67.4%,and 6.5%,respectively.In comparison to N2 conditions,the corrosion inhibition performance of the annular protection fluid was significantly reduced under gas invasion conditions.Furthermore,under gas intrusion conditions with the presence of O2,the corrosion inhibition rare of the annular protection fluid decreased significantly,failing to meet the requirements specified in SY/T 5273-2014(corrosion inhibition rate≥70%).When compared to the blank solution of simulated oilfield produced water,the corrosion potential of J55 steel specimens in the simulated oilfield produced water annular protection fluid exhibited a positive shift.The mechanism of this annular protection solution is a"negative catalytic effect"type,which significantly blocks the anodic reaction during the corrosion process and thereby reduces the corrosion rate of J55 casing and tubing.关键词
J55油套管/水基环空保护液/气侵工况/缓蚀率/腐蚀速率Key words
J55 casing and tubing/water-based annular protection fluid/gas invasion conditions/corrosion inhibition rate/corrosion velocity分类
金属材料引用本文复制引用
张大伟,吕祥鸿,谢登峰,赵凯峰,陈作明,罗泰星,李奥,陈帅..不同气侵工况下油井用水基环空保护液缓蚀性能研究[J].焊管,2025,48(4):31-37,7.基金项目
国家自然科学基金青年基金项目"W/B4C纳米多层涂层的界面结构和强韧化机理研究"(项目编号51902254). （项目编号51902254）
