目的 缓解渤海某油田混合注水出现严重的CO2/H2S腐蚀、现场检测挂片的点腐蚀非常明显等问题。方法 首先合成一种适合该油田工况的咪唑啉季铵盐（LH-31），再通过复配得到最优的缓蚀剂配方。结果 利用动态高温高压釜，在95 ℃、0.15 MPa CO2（含100 μg/g H2S）、总压0.5 MPa N2、流速1.5 m/s、试验时间72 h条件下，测得空白平均腐蚀率为2.01 01 mm/a，点腐蚀速率1.1106 mm/a。添加40 mg/L的LH-31后，平均腐蚀率降至0.1000 mm/a，点腐蚀速率降至0.5789 mm/a。LH-31的红外谱图中，在879.31 cm-1出现一个吸收峰，可能是季氮原子与相邻碳之间的伸缩振动，说明形成了环状季铵盐类化合物。LH-31与硫脲和苯甲酸钠之间具有协同效应，添加4%硫脲和3%苯甲酸钠组成的高效复合缓蚀剂2E，可将平均腐蚀速率降至0.0200 mm/a，点腐蚀速率降至0.0751 mm/a。极化曲线测试表明缓蚀剂2E为阳极抑制型缓蚀剂。缓蚀剂2E在现场进行了试验，通过旁路腐蚀试验测试1 d后，前后加注40 mg/L的缓蚀剂2E，试片的平均坑深由0.139 μm降低至0.0258 μm。结论 缓蚀剂2E能有效抑制该渤海油田混合注水的均匀腐蚀和点腐蚀。

The work aims to reduce the serious CO2/H2S corrosion problems of water injection on offshore oilfield in the Bohai sea and the serious pittig corrosion of the test coupons. An imidazoline quaternary ammonium salt LH-31 applicable to the oilfiled conditions was synthesized and the optimum corrosion inhibitor was obtained through molecule compound. At 95 ℃ and 0.15 MPa CO2 (including 100 μg/g H2S), the blank average corrosion measured at total pressure of 0.5 MPa N2 and flow velocity of 1.5 m/s for 72 hours was 2.0101 mm/a and pitting corrosion rate was 1.1106 mm/a. The average corrosion decreased to 0.1000 mm/a and pitting corrosion rate reduced to 0.5789 mm/a after 40 mg/L LH-31 was added. LH-31 had an absorption peak in 879.31 cm-1. A stretching vibration might occur between the nitrogen atoms and adjacent carbons and the quaternary ammonium salts might be formed. LH-31 had synergistic effect with thiourea and sodium benzoate. The efficient compound corrosion inhibitor 2E composed of 4% thiourea and 3% sodium benzoate could reduce the average corrosion to 0.0200 mm/a and the pitting corrosion rate to 0.0751 mm/a. The polarization curve test showed that the corrosion inhibitor 2E was the anode type of corrosion inhibitor. After the corrosion inhibitor passed the bypass corrosion test for 1 day, the average depth of the test coupon was reduced to 0.0258 μm from 0.139 μm after adding 40 mg/L of 2E. The corrosion inhibitor can effectively inhibit the uniform corrosion and pitting corrosion of mixed water injection in the Bohai Sea.