Abstract: At present,the research on the corrosion rate of the oil casing in the wellbore containing CO2/H2S is the current research hot spot in the field of corrosion and protection. In order to accurately study the corrosion situation of the oil casing and predict the corrosion rate,the weight loss method was first adopted to study the corrosion rate under different corrosion time,and the experimental results were fitted. Secondly, combining the research results of this paper with the previous research content,the Table Curve 3D software for multiple regression was used to determine the corrosion rate prediction model.The results show that the corrosion rate decreases continuously with the increase of time.The fitting of the experimental results R2 is 0.989 3,the error is small.The model established by multiple regression can accurately predict the corrosion rate and the error is within 5%,which meets the accuracy requirements,and can lay the foundation for the on⁃site oil and gas well safety evaluation.

Key words: Corrosion model, Corrosion rate, Weightlessness method, Multiple regression

摘要： 目前，关于含CO2/H2S井筒中油套管腐蚀速率研究是当前腐蚀与防护领域研究的热点。为准确研究油套管腐蚀情况，预测腐蚀速率，首先采取失重法研究不同腐蚀时间下油套管的腐蚀速率，并对实验结果进行拟合。其次，将研究结果与前人研究内容相结合，借助Table Curve 3D软件进行多元回归，确定腐蚀速率预测模型。结果表明，腐蚀速率随时间增加而不断减小，对实验结果进行拟合R2为0.989 3，误差较小。多元回归所建立模型能够准确预测腐蚀速率，误差在5%以内，满足精度要求，能够为现场油气井安全评价奠定基础。

关键词: 腐蚀模型, 腐蚀速率, 失重法, 多元回归