高含硫气田集输净化管道缓蚀剂预膜稳定性

Stability of corrosion inhibitor film of high sulfur gas gathering pipeline

针对高含硫气田集输净化系统两相湍流流动条件下缓蚀剂预膜稳定性问题,利用高温高压动态循环腐蚀反应釜实验系统,开展高含硫气田典型管流流动条件下缓蚀剂膜稳定性评价研究:当流速在6 m·s-1以下时,缓蚀剂预膜稳定性较好;当流速超过7.5 m·s-1后,缓蚀剂预膜开始出现局部破坏;当流速达9 m·s-1时,缓蚀剂膜在较高的流动剪切应力作用下已完全失效。流体动力学研究表明剪切应力为6.5 N·m-2时为缓蚀剂膜发生整体破坏的临界点。

Aiming at the stability problem of corrosion inhibitor film of the high sulfur gas gathering pipelines with two-phase turbulent flow, the corrosion inhibitor film stability with typical pipe flow in high sour gas field was evaluated by using the dynamic corrosion test system with high temperature and high pressure cyclic reactor. The inhibitor prefilm stability was better when the flow velocity was below 6 m＆#183;s？1 and it began partial failure when the flow rate exceeded 7.5 m＆#183;s？1, while it was completely failure under the action of flow shear force when the flow rate reached 9 m＆#183;s？1. The fluid dynamics study showed that the shear stress of 6.5 N＆#183;m？2 was the critical point of the inhibitor film being overall damaged.