The research of CO₂ erosion-corrosion (E-C) of carbon steel pipelines in wet gas-solid flow, as a critical consideration for oil and gas engineering applications, is increasingly receiving more and more interest and attention. A semi-empirical model for the prediction and risk assessment of the conjoint CO₂ E-C rate in such conditions is proposed. The variation of fluid properties with system environment is considered during gas-solid flow. The Eulerian-Lagrangian method is employed to solve the N–S equation for computational domain flow field and the force balance equation for migration trajectory of solid particles in the simulation space, and the fluid-solid interaction is considered. An empirical CO₂ corrosion model as well as its modified form is provided and verified and an erosion wear model is also adopted, which are both suitable for carbon steel. In addition, the synergistic effect of both models is considered. Based on the above contents, the CFD-DPM technology with test data is adopted to obtain the parameters that are used in both models, and the total CO₂ E-C rate, separate erosion rate, separate CO₂ corrosion rate can then be obtained at different positions of the pipeline wall. Furthermore, the dominated rate is determined and analyzed, and based on the total CO₂ E-C rate, the severity of the conjoint CO₂ E-C is shaped. The proposed model can quickly and conveniently compute and determine the dominated rate and severity at different positions, and then further determine the weak positions and statuses where pipeline failures may happen. The model is expected to provide theoretical support for the prevention and daily risk management of carbon steel pipelines failures during the process of oil and gas production and transportation, so as to safely and reliably complete the established production tasks and maximize the economic benefits.

作为油气工程应用的重要考虑因素，对湿气固流中碳钢管道的CO ₂腐蚀（EC）的研究越来越受到人们的关注和关注。提出了在这种条件下对CO ₂ EC联合排放率进行预测和风险评估的半经验模型。在气固流动过程中考虑了流体性质随系统环境的变化。采用Eulerian-Lagrangian方法求解计算空间流场的NS方程和模拟空间中固体颗粒迁移轨迹的力平衡方程，并考虑了流固耦合。实验CO ₂提供并验证了腐蚀模型及其修改形式，还采用了腐蚀磨损模型，均适用于碳钢。另外，考虑了两个模型的协同效应。基于以上内容，采用带测试数据的CFD-DPM技术获得了两个模型中使用的参数，然后可以在不同的情况下获得总的CO ₂ EC率，单独的腐蚀率，单独的CO ₂腐蚀率。管道壁的位置。此外，确定和分析占主导地位的比率，并基于总的CO ₂ EC比率确定联合CO ₂的严重程度EC是成形的。所提出的模型可以快速方便地计算并确定不同位置的主导速率和严重性，然后进一步确定可能发生管道故障的薄弱位置和状态。该模型有望为油气生产和运输过程中碳钢管道故障的预防和日常风险管理提供理论支持，从而安全可靠地完成既定的生产任务，实现经济效益最大化。