J油田水源井油管的腐蚀原因及防治措施
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摘要
J油田某水源井投产3a后,油管频繁出现腐蚀穿孔现象。分析了现场实际工况和油管腐蚀情况,并通过腐蚀动态模拟试验研究了油管腐蚀穿孔的机理,最后提出对应的腐蚀防护措施。结果表明:该井产出水自身具有一定的结垢能力和腐蚀性,使渗氮N80油管钢发生轻微的结垢和腐蚀;酸性气体的存在和流速的增大使得井下油管发生严重的不均匀结垢和垢下腐蚀,随着生产的进行,油管内部结垢和垢下腐蚀不断加剧,最终导致了油管穿孔失效。建议将油管材料更换为3Cr钢,使用牺牲阳极短节,并且定期清除井下的垢和腐蚀产物,以延长油管的服役寿命。
Corrosion perforation occurred frequently for the tubing of a water supply well in J oilfield after three years of production.Actual operating condition of production field and corrosion characteristic of the tubing were analyzed.And the mechanism of corrosion perforation of the tubing was studied by dynamic simulating corrosion test.At last corrosion protecting measures were proposed.The results show that the produced water from the well with certain scaling tendency and corrosiveness caused the slight scaling and corrosion of nitrided N80 steel tubing.The existence of acid gas and the increase of flow rate resulted in severe asymmetrical scaling and under-deposit corrosion.As production progressed,the situation of scaling and under-deposit corrosion in the tubing became worse,which finally gave rise to perforation failure of the tubing.To extend the service life of the tubing,it was suggested to replace the tubing material with 3 Cr steel,use sacrificial anode short piece and get rid of scaling and corrosion products in well.
Corrosion perforation occurred frequently for the tubing of a water supply well in J oilfield after three years of production.Actual operating condition of production field and corrosion characteristic of the tubing were analyzed.And the mechanism of corrosion perforation of the tubing was studied by dynamic simulating corrosion test.At last corrosion protecting measures were proposed.The results show that the produced water from the well with certain scaling tendency and corrosiveness caused the slight scaling and corrosion of nitrided N80 steel tubing.The existence of acid gas and the increase of flow rate resulted in severe asymmetrical scaling and under-deposit corrosion.As production progressed,the situation of scaling and under-deposit corrosion in the tubing became worse,which finally gave rise to perforation failure of the tubing.To extend the service life of the tubing,it was suggested to replace the tubing material with 3 Cr steel,use sacrificial anode short piece and get rid of scaling and corrosion products in well.
引文
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[12]傅乐荣,牛君,左治江.油管离子渗氮方法及防腐蚀耐磨性能分析[J].石油化工腐蚀与防护,2012,29(2):12-15.
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[14]薛致远,毕武喜,陈振华,等.油气管道阴极保护技术现状与展望[J].油气储运,2014,33(9):938-944.
[15]毕志峰.油水井阴极保护技术在现河采油厂的应用[J].石油与天然气化工,2009,38(2):153-157.
[16]裘智超,熊春明,常泽亮,等.油管内涂层防腐技术在塔中Ⅰ号气田的应用[J].天然气工业,2012,32(10):86-89.
[17]凌涛,何银达,李旭,等.油管内涂层防腐技术应用[J].钻采工艺,2008,31(2):140-141.
[2]黎洪珍,罗立然,李娅,等.油管腐蚀原因分析及腐蚀评价[J].天然气工业,2003,23(S1):107-110.
[3]孙粲,谢发勤,田伟,等.油管钢的CO2和H2S腐蚀及防护技术研究进展[J].石油矿场机械,2009,38(5):55-61.
[4]裴承河,陆正元.酸性气田井下油管腐蚀失效原因[J].腐蚀与防护,2014,35(5):525-527.
[5]吕拴录,相建民,常泽亮,等.牙哈301井油管腐蚀原因分析[J].腐蚀与防护,2008,29(11):706-709.
[6]王凯.油井管材料液固两相流体冲刷腐蚀研究[D].西安:西安石油大学,2013.
[7]刘广柱,马胜强,邢建东,等.冲蚀角度对Fe-2.5B耐锌液腐蚀性能的影响[J].中国科技论文,2014(6):632-636.
[8]林海,许杰,幸雪松,等.L80油管钢在CO2/H2S环境中的腐蚀行为[J].表面技术,2016,45(5):84-90.
[9]蒋晓蓉,黎洪珍,谢南星,等.油管腐蚀因素分析及防腐对策的研究与应用[J].钻采工艺,2006,29(1):84-86.
[10] CHANG Y C,WOOLLAM R,ORAZEM M E.Mathematical models for under-deposit corrosion:I.aerated media[J].Journal of the Electrochemical Society,2013,161(6):C321-C329.
[11]石卫国,仇朝军,闫化云,等.渤海某油田井下管柱腐蚀失效分析[J].全面腐蚀控制,2012,26(2):7-10.
[12]傅乐荣,牛君,左治江.油管离子渗氮方法及防腐蚀耐磨性能分析[J].石油化工腐蚀与防护,2012,29(2):12-15.
[13]念大海.阴极保护技术应用现状分析[J].石油和化工设备,2012(11):68-69.
[14]薛致远,毕武喜,陈振华,等.油气管道阴极保护技术现状与展望[J].油气储运,2014,33(9):938-944.
[15]毕志峰.油水井阴极保护技术在现河采油厂的应用[J].石油与天然气化工,2009,38(2):153-157.
[16]裘智超,熊春明,常泽亮,等.油管内涂层防腐技术在塔中Ⅰ号气田的应用[J].天然气工业,2012,32(10):86-89.
[17]凌涛,何银达,李旭,等.油管内涂层防腐技术应用[J].钻采工艺,2008,31(2):140-141.