摘要
在实验室内利用模拟现场流动状态的动态实验设备,模拟高含H2S和CO2的NY气田地面集输工况,采用失重挂片、金相显微镜、扫描电镜和能谱测试分析了液体流速对CP 50缓蚀剂作用的效果。CP 50缓蚀剂使用的临界流速为实验虚拟流速8 m/s,在该流速下,能够很好地抑制L 360 NC管线钢的均匀腐蚀和点蚀。随着流速的进一步增大,缓蚀剂作用效果变差。高速流体的作用流体动力使腐蚀产物膜疏松多孔,易产生点蚀,缓蚀作用的效果显著下降,建议定期清管,降低积液,控制流体流速。
In the laboratory,dynamic experiment equipment for simulating on-site flow state is adapted to simulate the operating conditions of surface gathering and transportation system in NY Gas Field with high H_2S and CO_2 content,weight loss coupon,metallographic microscope and SEM and EDS are applied to analyze the effect of liquid flow rate velocity on corrosion inhibitor CP 50.The corrosion inhibitor can well inhibit uniform corrosion and pitting in L.360 NC pipeline steel if its critical flow velocity is the experimental virtual velocity,that is,8m/s,With the further increase of flow velocity,inhibition effect decreases.The corrosion product film is loose and porous in high flow velocity liquid,which will easily result in pitting,accordingly,inhibition effect decreases significantly.Therefore,it is suggested that pipeline cleaning is conducted periodically so as to minimize the accumulated liquid and suitably control liquid flow velocity.
出处
《天然气与石油》
2015年第1期77-79,11-12,共3页
Natural Gas and Oil
关键词
临界流速
缓蚀剂
L
360
NC
Critical flow velocity
Corrosion inhibitor
L 360 NC
