油田注水井的腐蚀风险研究
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摘要
注水井在输送注入水的同时,可能会引入溶解氧、微生物和结垢等腐蚀性因子,对油井管柱的安全运行带来挑战。通过模拟研究工况环境,开展P110油套管钢在注入水中的高温高压腐蚀评价试验及细菌腐蚀试验,利用失重法测试腐蚀速率,利用扫描电镜(SEM)及能谱仪进行腐蚀形态观察和腐蚀产物分析,研究了油井管在注入水后的腐蚀风险。结果表明:注入水引入的溶解氧、SRB和垢沉积均会导致P110钢腐蚀速率明显增加,且存在一定的局部腐蚀敏感性。
The transportation of injection water might mix with some corrosive factors such as dissolved oxygen,microbes and fouling,which posed the challenges for the safe operation of oil well tube. Through simulating operation environment,the high-temperature and high-pressure corrosion test of P110 steel in the injection water and the bacterial corrosion test were carried out,and the corrosion rate was measured by the weight loss method. In addition,the corrosion morphology was characterized by scanning electron microscopy( SEM) and energy dispersive spectrometer,which further studied the corrosion risk of oil well tube with injection water. Results showed that the corrosion rate was significantly increased by the dissolved oxygen,SRB and scale deposition induced by injection water,and there was a certain localized corrosion sensitivity.
The transportation of injection water might mix with some corrosive factors such as dissolved oxygen,microbes and fouling,which posed the challenges for the safe operation of oil well tube. Through simulating operation environment,the high-temperature and high-pressure corrosion test of P110 steel in the injection water and the bacterial corrosion test were carried out,and the corrosion rate was measured by the weight loss method. In addition,the corrosion morphology was characterized by scanning electron microscopy( SEM) and energy dispersive spectrometer,which further studied the corrosion risk of oil well tube with injection water. Results showed that the corrosion rate was significantly increased by the dissolved oxygen,SRB and scale deposition induced by injection water,and there was a certain localized corrosion sensitivity.
引文
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[2]王小琳,武平仓,向忠远.长庆低渗透油田注水水质稳定技术[J].石油勘探与开发,2002,29(5):77-79.
[3] EGGUM T,ARUMUGAM S,TAJALLIPOUR N,et al. Comprehensive approach to oxygen corrosion analysis of water injection systems:Corrosion,2015[C]. Houston,TX:NACE International,2015:171-172.
[4]孙伯英,金鸿章.油田注入水———海水的脱氧[J].石油石化节能,1990(3):36-38.
[5]张振飞,陈洪伟,韩金福.中原油田注水系统全程细菌控制技术[J].腐蚀与防护,2010(8):649-650.
[6] MYHR S,LillebB L,SUNDE E,et al. Inhibition of microbial H2S production in an oil reservoir model column by nitrate injection.[J]. Applied Microbiology and Biotechnology,2002,58(3):400-408.
[7] WANG W,LI X,WANG J,et al. Influence of biofilms growth on corrosion potential of metals immersed in seawater[J]. Materials and Corrosion—Werkstoffe und Korrosion,2004,55(1):30-35.
[8] KIM J G,KIM Y W. Cathodic protection criteria of thermally insulated pipeline buried in soil[J]. Corrosion Science,2001,43(11):2 011-2 021.
[9]傅晓蕾,马力,闫永贵,等.溶解氧浓度对船体钢在海水中腐蚀行为的影响[J].腐蚀与防护,2010,31(12):942-945.