目的 在油田生产过程中，腐蚀的危害性极大，所以套管材质选择至关重要。生产套管材质选择级别低，二氧化碳腐蚀可能导致套管腐蚀穿孔，严重则会影响正常生产，出现安全和环境问题等。如果套管材质选择级别过高，会造成经济上的浪费。为了使材质选择更加合理，所以进行研究。方法 以De. Waard预测腐蚀模型计算的不同材质的长期腐蚀速率为基础，提出了一套新的套管选材新方法。通过该方法对渤海油田A井进行了设计，并通过室内实验对设计结果进行了验证。结果 根据实验得到的管材选择结果与管材设计新方法设计的结果一致，验证了该方法的准确性。结论 提出了一套适合于CO2腐蚀环境下套管材质优选的方法：计算不同材质的腐蚀速率，进而转化为长期腐蚀速率，根据套管强度要求，计算出套管最大允许磨损量，最终确定套管选择材质。该套管选材新方法能够在保证井筒完整性和井控安全可控的前提下，有效降低套管材质选择的成本，有利于保证油田开发的经济性。

Corrosion is extremely harmful in the process of oil field production, thereby casing material selection is of great importance. When inferior casing material is selected for production, carbon dioxide corrosion may lead to casing corrosion perforation, which may affect normal production and cause safety and environmental problems in extreme cases. If high-level casing material is selected for production, it will cause economic waste. The work aims to make material selection more reasonable. A set of new ideas for casing selection was proposed based upon long-term corrosion rate of different materials calculated by De. Warrd corrosion prediction model. Well A in Bohai Offshore Oilfield was designed in this method, and design results were verified by performing laboratory experiments. The casing selection results from the experiments were consistent with those from new design method, which verified accuracy of the method. A set of methods is proposed for casing material selection in CO2 corrosion environment is proposed: corrosion rate of different materials is calculated and converted into long-term corrosion rate. Then the maximum allowable wear extent of the casing is calculated according to casing strength requirement. Finally, casing selection material is determined. This new method can effectively reduce cost of casing material selection and make for guaranteeing oilfield development efficiency while maintaining wellbore integrity and controllable well control safety.