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通过对大庆油田某井中的已腐蚀油管和另一口井中的未腐蚀油管的外腐蚀形态、化学成分、金相组织等对比分析 ,发现两者无重大差别 ,属于同一类型且无夹杂物等严重缺陷 ;腐蚀管的附着物及形态分析发现主要存在两类腐蚀产物 ,外表面主要存在着高分子碳氢化合物及SiO2 ,靠近管体则存在者一些氧腐蚀产物 ,无CO2 腐蚀环境中的特征产物存在 ;腐蚀电化学试验表明 ,这两个管样的腐蚀特性基本一致。因此可以判定该井使用的已腐蚀油管本身无严重组织缺陷 ,腐蚀特性与另一油井中的油管相同 ,油管外壁的腐蚀主要是由于发生了氧腐蚀。可以通过减少油套管环空中腐蚀介质的侵蚀性如加入缓蚀剂、降低氧含量等 ,或通过采用耐蚀油管来减轻和防止这种腐蚀
Through the comparative analysis of the external corrosion form, chemical composition and microstructure of the corroded tubing in one well of Daqing Oilfield and the non-corroded tubing in the other well, it is found that there is no significant difference between the two and belongs to the same type with no serious defects such as inclusions . There were two kinds of corrosion products mainly existed in the attachments and morphology analysis of the corrosion pipe. There were mainly high molecular hydrocarbons and SiO2 on the outer surface, some oxygen corrosion products near the pipe body, and no characteristic products existed in the CO2 corrosion environment Corrosion electrochemical tests showed that the corrosion characteristics of the two tube samples were basically the same. Therefore, it can be determined that the corroded tubing itself used in the well has no serious tissue defects and has the same corrosion characteristics as the tubing in another well. The corrosion of the tubing outer wall is mainly due to oxygen corrosion. This corrosion can be mitigated and prevented by the use of corrosion resistant tubing by reducing the aggressiveness of the corrosive media in the annulus of the oil cannula, such as by adding corrosion inhibitors, reducing the oxygen content, etc.