高含 CO 2气田地面集输系统缓蚀剂的优选与应用

摘要

针对陕北长北气田天然气中 CO 2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 CO 2气田的缓蚀剂 KYC-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 KYC-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25 mg/(100 m3)时,缓蚀率均超过90%,处理费用仅为0.03元/(100 m3),经济和社会效益显著。%Aiming at the situation of high CO 2 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 CO 2 gas fields KYC-2 was optimized.The property of KYC-2 in high pressure simulated corrosion environment was evaluated by autoclave corrosion evaluation experiment.The field test showed that KYC-2 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 m3 ),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.