CO_2驱采出井井下附件材料的腐蚀评价与优选  

Material Selection and Corrosion Evaluation of Down-hole Accessory for CO_2 Flooding Production Wells

作　　者：涂亚明[1,2,3] 石善志 刘从平 廖锐全 刘捷[1,2,3] TU Yarning;SHI Shanzhi;LIU Congping;LIAO Ruiquan;LIU Jie(Petroleum Engineering College,Yangtze University,Wuhan 430100,China;Engineering Technology Institute of Xinjiang Oilfield Company,PetroChina,Karamay 83400,China;The Multiphase Flow Laboratory of Gas Lift Innovation Center,CNPC,Wuhan 430100,China;The Branch of Key Laboratory of CNPC for Oil and Gas Production,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]中国石油天然气集团公司气举实验基地多相流研究室,武汉430100 [3]长江大学中国石油天然气集团公司采油采气重点实验室长江大学研究室,武汉430100 [4]中国石油新疆油田分公司工程技术研究院,克拉玛依834000

出　　处：《腐蚀与防护》2018年第9期658-662,688,共6页Corrosion & Protection

基　　金：国家重大科技专项(2016ZX05056004-002)

摘　　要：采用高温高压动态循环腐蚀试验,研究了35CrMo钢、42CrMo钢、3Cr13不锈钢、45号钢、304L不锈钢、316L不锈钢等6种材料在温度为30~65℃,压力为2 MPa,液相介质流速为1.2m/s的CO_2驱采出井环境中的腐蚀规律。采用扫描电子显微镜(SEM)和附带能谱仪(EDS)对腐蚀产物的形貌和成分进行了表征。结果表明:在本试验环境中,304L和316L不锈钢均未发生腐蚀;3Cr13不锈钢受到轻微CO_2腐蚀,腐蚀速率低于行业标准要求的0.076mm/a,其他材料的腐蚀速率均偏大,其在CO_2驱油田采出井环境中的腐蚀速率由大到小为:45号钢>42CrMo钢>35CrMo钢。合金中的Cr含量较低时(0~9%),随着Cr含量的升高,含Cr合金的耐CO_2腐蚀性增强;环境温度为30~65℃时,随着温度的升高,合金的腐蚀速率增大,这与腐蚀产物膜的生长情况有关。The corrosion laws of six kinds of material such as 35CrMo steel,42CrMo steel,3Cr13 stainless steel,45 steel,304 Lstainless steel and 316 Lstainless steel in the CO2 flooding outflow environment with temperature of 30~65 ℃,pressure of 2 MPa and liquid medium flow rate of 1.2 m/s were studied by high temperature and high pressure dynamic cycle test.The morphology and composition of corrosion products were characterized by scanning electron microscopy（SEM）and an attached energy dispersive spectrometer（EDS）.The results show that in the test environment,neither 304 Lnor 316 Lstainless steel corroded;3Cr13 stainless steel had slightly CO2 corroded,and the corrosion rate was lower than the industry standard of 0.076 mm/a.The corrosion rates of other materials were too large,and the corrosion rate in the CO2 flooding production well environment from large to small were as follow：45steel 〉42CrMo steel 〉35CrMo steel.When the Cr content in the alloy was low（0~9%）,the corrosion resistance of the Cr-containing alloy was enhanced with the increase of Cr content.When the ambient temperature was 30~65 ℃,the corrosion rate of the alloy increased with the increase of temperature,which was related to the growth of the corrosion product film.

关 键 词：井下附件材料 CO2腐蚀 高温高压 腐蚀产物 

分 类 号：TE242[石油与天然气工程—油气井工程]