Corrosion and erosion are the common pipe-integrity issues that occur when carbon dioxide, hydrogen sulfide and sand exist in the gas stream at the same time. Corrosion is developed by the reaction among carbon dioxide, hydrogen sulfide and iron, while erosion by the physical damage through flowing sand. When it comes to the prediction model which could accommodate both events, complex phenomena related to physics, chemistry and metallurgy should be put into account. In this paper, we develop a new-integrated corrosion-erosion model which can calculate the corrosion-erosion rate by considering the interactions among type of passive layer (mackinawite and siderite), formation and removal rate of passive layer, and surface reaction rate. The integrated model consists of fluid flow in pipes equation, kinetics of reaction, fundamental diffusion law, empirical erosion equation and fundamental Faraday’s law. Corrosion-erosion rate is obtained through iteration scenario after establishing pressure and temperature from fluid flow in pipes equation. Pipe dimension used in the simulation has tubing ID 2.992 in for vertical pipe and flowline ID 2.992 in for horizontal pipe. Simulations were conducted using hypothetic gas field data with variation of hydrogen sulfide and carbon dioxide composition. In constant erosion rate, when the hydrogen sulfide percentage is significantly greater than carbon dioxide, corrosion is more dominant than passive layer formation. However, when the carbon dioxide percentage is greater than that of hydrogen sulfide, the passive layer tends to form, resulting in scaling. These results can be explained by the faster formation rate of siderite than mackinawite. Finally, the proposed model can explain clearly the phenomena of corrosion-erosion and scaling by simplifying the complex phenomena occurred.

当二氧化碳、硫化氢和沙子同时存在于气流中时，腐蚀和侵蚀是常见的管道完整性问题。腐蚀是由二氧化碳、硫化氢和铁之间的反应产生的，而流沙受到物理损伤的侵蚀。当涉及到可以同时容纳这两种事件的预测模型时，应该考虑到与物理、化学和冶金相关的复杂现象。在本文中，我们开发了一种新的集成腐蚀-侵蚀模型，该模型可以通过考虑钝化层类型（麦金纳矿和菱铁矿）、钝化层的形成和去除速率以及表面反应速率之间的相互作用来计算腐蚀-侵蚀速率。综合模型由管道中的流体流动方程、反应动力学、基本扩散定律、经验侵蚀方程和基本法拉第定律。根据管道中的流体流动方程建立压力和温度后，通过迭代场景获得腐蚀-侵蚀率。模拟中使用的管道尺寸对于垂直管道具有管道 ID 2.992 英寸，对于水平管道具有流线 ID 2.992 英寸。使用具有硫化氢和二氧化碳成分变化的假设气田数据进行模拟。在恒定侵蚀速率下，当硫化氢百分比明显大于二氧化碳时，腐蚀比钝化层形成更占优势。然而，当二氧化碳的百分比大于硫化氢的百分比时，会形成钝化层，导致结垢。这些结果可以解释为菱铁矿的形成速度比麦金那矿更快。最后，