海上油气生产设施低浓度柠檬酸腐蚀研究及酸洗应用  

Research on low-concentration citric acid corrosion in offshore oil and gas production facilities and application of acid washing

作　　者：苗建 吴二亮 夏力 MIAO Jian;WU Erliang;XIA Li(CNOOC Deepwater Development Limited,Zhuhai 519050,China;CenerTech Oilfield Chemical Co.,Ltd,Tianjin 300452,China)

机构地区：[1]中海石油深海开发有限公司,广东珠海519050 [2]中海油(天津)油田化工有限公司,天津300452

出　　处：《石油化工腐蚀与防护》2024年第6期22-25,共4页Corrosion & Protection In Petrochemical Industry

摘　　要：柠檬酸酸洗对海上油气处理设备具有广泛的适用性,由于相关研究欠缺,严重限制了柠檬酸酸洗的大规模应用。为了充分了解低浓度柠檬酸对不同金属的腐蚀影响,科学有效地指导柠檬酸酸洗作业,以海上油气生产设施常用金属材质为对象,开展了柠檬酸腐蚀试验。结果表明,在质量分数为10%的柠檬酸溶液中,TC4,2205,304和316L等金属腐蚀较轻,虽然20号钢腐蚀速率高达1.0527 mm/a,但仍小于1.1159 mm/a,满足碳钢清洗预膜质量要求。控制柠檬酸酸洗时间在24 h以上,酸洗温度在25℃以内,并在酸洗溶液中添加质量分数为1%的HYH-38缓蚀剂,可以起到良好的缓蚀作用。在推荐的低浓度柠檬酸酸洗程序指导下,在海上天然气冷却器上开展了酸洗实践,取得了较好的酸洗效果,为柠檬酸酸洗技术在海上油气生产设施上的推广应用提供了示范和依据。Citric acid washing has a wide range of applicability for offshore oil and gas treatment equipment.Due to lack of relevant research,the large-scale application of citric acid washing is severely restricted.In order to fully understand corrosion effects of low-concentration citric acid on different metals for guiding citric acid washing operations scientifically and effectively,citric acid corrosion testings were conducted on frequently-used metal materials in offshore oil and gas production facilities.The results suggested that in citric acid solution with a mass fraction of 10%,the corrosion was relatively mild for metals such as TC4,2205,304 and 316L.Although corrosion rate of No.20 steel was as high as 1.0527 mm/a,it was still less than 1.1159 mm/a,meeting the quality requirements for carbon steel cleaning pre-film.It can have good corrosion inhibition effect by controlling the time of citrate acid washing for more than 24 hours,adjusting the temperature of acid washing within 25℃ and adding HYH-38 inhibitor with a mass concentration of 1% in citric acid solution.Under the guidance of recommended low-concentration citric acid washing procedure,acid washing practice was carried out in offshore natural gas cooler,which achieved good acid washing results and provided a basis for the application of citrate acid washing technology in offshore oil and gas facilities.

关 键 词：海上设施 油气处理 柠檬酸 酸洗 缓蚀率 

分 类 号：TE985[石油与天然气工程—石油机械设备]