为全面评估输油管道的内腐蚀特性，降低腐蚀带来的经济损失和安全风险，利用计算流体力学模型分析了含水率、倾角和流速对管道内积水特性的影响，得到了不同工况下的流型分布，针对流型和积水厚度，按照0~9标度划分并制定了腐蚀程度评价准则，用于指导现场输油管道的腐蚀评价。结果表明，在流速0.5 m/s时，对于上倾段，随着含水率的增加会出现水相逆流现象；对于下倾段，油水界面较为光滑，且直管段的积水厚度大于下倾段的积水厚度。腐蚀风险从大到小依次为水相逆流、波状分层流、光滑分层流和油包水分散流；相同流型下，上倾段的腐蚀风险高于直管段和下倾段。现场两处水相逆流区的平均剩余壁厚仅为设计壁厚的60%，存在较为严重的腐蚀现象，模型评价结果与实际情况相符。研究结果可为管道完整性管理水平的提升提供理论依据。

To comprehensively evaluate the internal corrosion characteristics of oil pipelines and reduce the economic losses and safety issues caused by corrosion, this paper analyzes the influences of water content, inclination angle, and flow velocity on the water accumulation characteristics by using a computational fluid dynamics (CFD) model. The flow pattern distributions under different working conditions were obtained. For the flow pattern and water accumulation thickness, the corrosion degree evaluation criterion was formulated according to the 0~9 scale. It was used to guide the corrosion evaluation of on-site oil pipelines. The results show that for the upward-inclined section, there exists a counter-flow phenomenon of accumulated water with the increase of water content at a flow velocity of 0.5 m/s. For the downward-inclined pipe, under the condition of flow velocity of 0.5 m/s, the oil-water interface is relatively smooth, and the water accumulation thickness in the straight pipe section is greater than that in the downward-inclined section. The corrosion risks from high to low are in the order of water phase counter flow, wavy stratified flow, smooth stratified flow, and water-in-oil dispersed flow. Under the same flow pattern, the corrosion risk of the upward-inclined section is higher than those of the straight pipe section and the downward-inclined section. The average remaining wall thickness in the two water phase counter-flow areas on site is only 60% of the designed wall thickness, and there is a relatively serious corrosion phenomenon. The model evaluation results are in line with the actual situation. The research results can provide a theoretical basis for the improvement of pipeline integrity management level.