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涂层与防护
           第 41 卷第 4 期                                                                              Vol.41 No.4
                                                                                                       Apr.2020
           2020 年 4 月
                                                  COATING AND PROTECTION



                          海上某油田油管腐蚀穿孔原因分析



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                                            童理 ,周小杰 ,孙吉星 ,王珏                2
               (1.中海油能源发展股份有限公司,天津 300452;2.中海油常州涂料化工研究院有限公司,江苏常州 213016)

                    摘要:通过宏观形貌分析、微观形貌分析、金相组织分析、EDS 分析、XRD 分析等方法,对海上某油田
                油管腐蚀穿孔原因进行了深入研究。 结果表明:油管穿孔位置的腐蚀产物主要为 FeCO 3 、FeS;油井处在高
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                温、高含 Cl 环境中,且含有一定量的 CO 2 和 H 2 S,静态条件下容易产生点蚀,而油管耐蚀能力不足,最后引
                起腐蚀穿孔。 建议现场油管更换耐蚀性能高于 N80 的材质。
                    关键词:油管;腐蚀穿孔;点蚀;耐蚀能力
                    中图分类号:TQ630          文献标识码:A         文章编号:1672-2418(2020)04-0001-05


                Cause Analysis of Tubing Corrosion and Perforation in

                                                Offshore Oilfield


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                                     Tong Li , Zhou Xiaojie , Sun Jixing , Wang Jue 2
                (1. CNOOC Energy Technology and Services Limited,Tianjin 300452, China;. CNOOC Changzhou
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                     Paint and Coatings Industry Research Institute Co., Ltd.,Changzhou, Jiangsu 213016,China)

                   Abstract: The causes of tubing corrosion and perforation in an offshore oilfield were deeply
                studied by means of macro morphology analysis, micro morphology analysis, metallographic structure
                analysis, EDS analysis and XRD analysis. The results show that FeCO 3 and FeS are the main
                corrosion products in the tubing perforation position. The oil well is exposed to high temperature and
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                high Cl containing environment, and contains a certain amount of CO 2 and H 2S, which is easy to
                produce pitting corrosion under static conditions, however the corrosion resistance of tubing is
                insufficient, which finally causes corrosion perforation. It is recommended the tubing that has been
                already put into production to be replaced with tubing whose material corrosion resistance higher
                than N80.
                   Keywords: tubing; corrosion perforation; pitting corrosion; corrosion resistance





           0 引言                                                    基于该油管的工艺流程、生产环境及以往腐蚀穿
                                                               孔问题的研究经验,本文通过宏观形貌分析、微观形
               海上某油田现场修井作业期间,发现某井油管腐                           貌分析、金相组织分析等方法,对海上某油田油管腐
           蚀穿孔, 而油管其它部位也出现了不同程度的腐蚀。                            蚀穿孔进行了全面分析与研究,查明其发生腐蚀的根
           油管材质为 N80,油管外径为 2-7/8",CO 2 分压为 0.07                本原因,并提出相应的解决方案和预防措施,为防止
           MPa,井底流压 7~8.5 MPa,地层温度约 90 ℃,含水率                   同类事件的再次发生提供重要的参考依据                   [1-5] 。
           为 24%。

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                                                                      腐蚀与控制 CORROSION AND CONTROL
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