Abstract: Aiming at the situation of high CO₂  content in Changbei gas field and serious corrosion of surface gathering pipeline, an effective corrosion inhibitor was indeed needed to ease the corrosion rate of surface gathering pipeline. Through the evaluation of corrosion inhibition efficiency and emulsifying property of the existing corrosion inhibitor, a corrosion inhibitor for high CO₂  gas fields KYC2 was optimized. The property of KYC2 in high pressure simulated corrosion environment was evaluated by autoclave corrosion evaluation experiment. The field test showed that KYC2 corrosion inhibitor was selected to be used in the field test. Using the prefilm method, the filling mode of four test wells was rotation every three days filling by branch trunk continuous way. When the concentration was 25 mg/(100 m3), corrosion inhibition efficiency was over 90%, and processing cost was only 0.03 (RMB)yuan/(100 m3). This corrosion inhibitor has significantly economic and social benefits.

Key words: CO₂ corrosion,    ,  Corrosion inhibition efficiency,   ,  Emulsifying property,    , Corrosion inhibitor

摘要： 针对陕北长北气田天然气中CO₂ 含量高, 地面集输管网腐蚀严重的现状, 急需一种有效的缓蚀剂来缓解地面集输管网的腐蚀速度。通过对现有的缓蚀剂的缓蚀率和乳化性评价, 优选出了一种适合高CO2 气田的缓蚀剂 KY C - 2, 利用高压釜腐蚀评价实验评价了其在高压模拟腐蚀环境中的性能。矿场应用结果表明, 选用 KY C - 2 缓蚀剂, 采用不预膜, 4口试验井采用每隔3天轮换加注, 支干线连续加注的方式, 质量浓度为2 5m g /( 1 0 0m3) 时, 缓蚀率均超过9 0%, 处理费用仅为0. 0 3元/( 1 0 0m3) , 经济和社会效益显著。

关键词:  CO₂ 腐蚀,  , 缓蚀率,  , 乳化性, 缓蚀剂