When water is present in a CO2 pipeline, corrosion or plugging can occur due to the formation of liquid water or gas hydrate, respectively. Understanding how corrosion and hydrate plugging can be avoided is important for enhanced oil recovery and carbon dioxide capture and storage processes. If the CO2 is sufficiently dried prior to transportation, the formation of these problematic free‐water phases can be avoided. In this work, isobaric T–x diagrams were developed from the P–T diagram for the CO2–H2O binary system. Pressures ranging from just below the lower quadruple point to above the lower critical end point were studied. These diagrams are meant to give the reader a better conceptual understanding of how the water composition in CO2–H2O mixtures will influence phases that form at different temperatures and pressures. The diagrams are analyzed from the perspective of flow assurance in CO2 transportation.

中文翻译：

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CO2-H2O 系统的 T-x 图：二氧化碳运输中水含量对于碳捕获和储存的重要性

当 CO 中存在水时2管道中，由于液态水或气体水合物的形成，可能会发生腐蚀或堵塞。了解如何避免腐蚀和水合物堵塞对于提高石油采收率以及二氧化碳捕获和储存过程非常重要。如果一氧化碳2在运输前充分干燥，可以避免这些有问题的自由水相的形成。在这项工作中，等压 T-x 图是从 CO 的 P-T 图发展而来的。2-H2O二进制系统。研究了从略低于下四点到高于下临界终点的压力范围。这些图表旨在让读者更好地概念性地了解 CO 中的水成分2-H2O 混合物会影响在不同温度和压力下形成的相。这些图是从 CO 流量保证的角度进行分析的2运输。