辅助蒸汽驱油环境中CO_2分压对N80钢腐蚀行为的影响
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摘要
采用高温高压釜模拟CO_2辅助蒸汽驱油注气井的工况条件,在温度160℃和CO_2分压1～4MPa条件下,对N80钢进行了挂片腐蚀试验,研究了CO_2分压对其腐蚀行为的影响。结果表明:随着CO_2分压的升高,腐蚀速率先升高后降低,并在CO_2分压为2MPa时达到最大,其值为0.073 7mm·a-1;N80钢腐蚀产物的主要成分是FeCO3和少量Fe2O3,随着CO_2分压的升高,FeCO3晶体尺寸减小,当CO_2分压为3～4 MPa时FeCO3晶体发生融合;在试验条件下,N80钢的腐蚀速率在0.034 7～0.073 7mm·a-1范围,均小于油田腐蚀速率控制指标(0.076mm·a-1),满足CO_2辅助蒸汽驱油注气井油套管的性能要求。
The high temperature and high pressure autoclave was used to simulate the working conditions of CO_2 auxiliary steam drive oil gas injection well.The coupon corrosion test was conducted on N80 steel at 160℃and CO_2 partial pressures of 1-4MPa,and the effect of CO_2 partial pressure on corrosion behavior of N80 steel was studied.The results show that with CO_2 partial pressure increasing,the corrosion rate increased first and then decreased;when the CO_2 partial pressure was 2MPa,the corrosion rate reached the maximum value of 0.073 7mm·a-1.The main composition of corrosion products of N80 steel was FeCO3 and a small amount of Fe2O3.With the increase of CO_2 partial pressure,the size of FeCO3 crystals decreased,and FeCO3 crystals mixed together when CO_2 partial pressure was 3-4 MPa.Under the test condition,the corrosion rate of N80 steel was 0.034 7-0.073 7mm·a-1 which was lower than the corrosion rate control line of oil field(0.076 mm·a-1)and met the property requirement of CO_2 auxiliary steam drive oil well casing.
The high temperature and high pressure autoclave was used to simulate the working conditions of CO_2 auxiliary steam drive oil gas injection well.The coupon corrosion test was conducted on N80 steel at 160℃and CO_2 partial pressures of 1-4MPa,and the effect of CO_2 partial pressure on corrosion behavior of N80 steel was studied.The results show that with CO_2 partial pressure increasing,the corrosion rate increased first and then decreased;when the CO_2 partial pressure was 2MPa,the corrosion rate reached the maximum value of 0.073 7mm·a-1.The main composition of corrosion products of N80 steel was FeCO3 and a small amount of Fe2O3.With the increase of CO_2 partial pressure,the size of FeCO3 crystals decreased,and FeCO3 crystals mixed together when CO_2 partial pressure was 3-4 MPa.Under the test condition,the corrosion rate of N80 steel was 0.034 7-0.073 7mm·a-1 which was lower than the corrosion rate control line of oil field(0.076 mm·a-1)and met the property requirement of CO_2 auxiliary steam drive oil well casing.
引文
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[3]黄本生,卢杰,邓龙,等.某油田N80钢油管腐蚀失效的原因[J].机械工程材料,2016,40(1):93-97.
[4]曾德智,邓文良,田刚,等.温度对T95钢在H2S/CO2环境中腐蚀行为的影响[J].机械工程材料,2016,40(6):28-32.
[5] ZHANG G A,LIU D,LI Y Z,et al.Corrosion behaviour of N80 carbon steel in formation water under dynamic supercritical CO2condition[J].Corrosion Science,2017,120:107-120.
[6] LI Y Z,XU N,LIU G R,et al.Crevice corrosion of N80carbon steel in CO2-saturated environment containing acetic acid[J].Corrosion Science,2016,112:426-437.
[7]朱世东,李金灵,杨志刚,等.温度对J55油管CO2腐蚀行为的影响[J].机械工程材料,2014,38(8):6-10.
[8] WEI L,PANG X,GAO K.Corrosion of low alloy steel and stainless steel in supercritical CO2/H2O/H2S systems[J].Corrosion Science,2016,111:637-648.
[9]王霞,张仁勇,上官昌淮,等.两种套管钢在含CO2模拟油田地层水中的腐蚀行为[J].机械工程材料,2013,37(5):69-72.
[10] ZHANG G A,ZENG Y,GUO X P,et al.Electrochemical corrosion behavior of carbon steel under dynamic high pressure H2S/CO2environment[J].Corrosion Science,2012,65(12):37-47.
[11] CHOI Y S,NESIC S,LING S.Effect of H2S on the CO2corrosion of carbon steel in acidic solutions[J].Electrochimica Acta,2011,56(4):1752-1760.
[12]陈东,柳伟,路民旭,等.CO2分压对N80钢腐蚀产物膜保护性能的影响[J].北京科技大学学报,2007,29(3):288-292.
[13]刘晓玮,蔡庆伍,武会宾,等.CO2分压对X80管线钢腐蚀性能的影响[J].腐蚀与防护,2012,33(6):502-506.
[14] SUN C,SUN J,WANG Y,et al.Effect of impurity interaction on the corrosion film characteristics and corrosion morphology evolution of X65 steel in water-saturated supercritical CO2 system[J].International Journal of Greenhouse Gas Control,2017,65:117-127.
[15]王世杰.CO2驱油注采井油套管腐蚀速率控制值[J].腐蚀与防护,2015,36(3):218.
[16] TANG Y,GUO X P,ZHANG G A.Corrosion behaviour of X65carbon steel in supercritical-CO2containing H2O and O2in carbon capture and storage(CCS)technology[J].Corrosion Science,2017,118:118-128.
[17] GUO S,XU L,ZHANG L,et al.Characterization of corrosion scale formed on 3Cr steel in CO2-saturated formation water[J].Corrosion Science,2016,110:123-133.
[18] WU Q,ZHANG Z,DONG X,et al.Corrosion behavior of low-alloy steel containing 1%chromium in CO2environments[J].Corrosion Science,2013,75:400-408.
[19] ZHANG G A,CHENG Y F.Localized corrosion of carbon steel in a CO2-saturated oilfield formation water[J].Electrochim Acta,2011,56(3):1676-1685.