【摘要】 油气井膨胀管技术是近年来油气井工程领域出现的一项新兴技术。本工作以L80套管为研究对象,分别进行16%和22%的膨胀,研究膨胀变形前后的微观组织变化规律。采用高压釜失重法、动电位极化和电化学阻抗谱技术研究了变形前后在饱和CO₂溶液中L80套管的腐蚀行为。从电化学特征看,膨胀变形后,套管自腐蚀电位更负,说明膨胀变形增大可增加腐蚀倾向,I_corr随着变形量的增加而增大;该结果与失重法试验结果相吻合。更多还原

【Abstract】 Expandable tubular techlology is a new technology in the well engineering industry.The microstructure of L80 casing tubes expanded by 16%and 22%respectively was studied before and after expansion.The corrosion behaviors were studied by weight-loss method in autoclave and electrochemical tests before and after tube expansion. The electrochemical characteristics showed that the corrosion potential became more negative after the expansion deformation,and I_corrincreased with the increase of the amount of deformation.The results matched well with the results of weight-loss experiment.更多还原