超临界CO₂缓蚀阻垢剂的合成及性能评价

Synthesis and Performance Evaluation of Supercritical CO₂ Corrosion and Scale Inhibitor

唐泽玮 慕立俊 周志平 黄 伟 范希良 周 佩 何 淼 李明星

TANG Zewei MU Lijun ZHOU Zhiping HUANG Wei FAN Xiliang ZHOU Pei HE Miao LI Mingxing

针对高矿化度低渗透油藏CO2驱油过程中超临界CO2腐蚀结垢问题，合成一种由苯甲酸硫脲基咪唑及磷酸酯基咪唑啉、喹啉季铵盐和聚环氧琥珀酸盐为主要成分构成的缓蚀阻垢剂CQ-HS。利用高温高压实验、电化学和阻垢率评价方法，在超临界条件下研究了CQ-HS的抗CO2腐蚀性和阻垢性能。研究结果表明，在80℃,CO2分 压9.0 MPa条件下，添加200 mg/L的缓蚀阻垢剂CQ-HS后，碳钢的腐蚀速率降为0.068 mm/a，具有良好的缓蚀性能；当缓蚀阻垢剂CQ-HS加量为200 mg/L时，其对硫酸钡锶垢的阻垢率可以达到80%以上。在超临界CO2条件下，CQ-HS缓蚀阻垢剂同时具有缓蚀和阻垢性能，可实现一剂多用的目标

Supercritical carbon dioxide corrosion and scaling often happened during carbon dioxide flooding in high salinity and low permeability reservoirs. A corrosion and scale inhibitor CQ-HS mainly consisted of thiourea imidazoline benzoate，organic phosphate imidazoline，quinoline quaternary ammonium salt and poly-epoxy-succinate，was synthesized. The anti-carbon dioxide corrosion and anti-scale performance were researched through high temperature and high pressure trial，electrochemical evaluation and scale inhibition rate evaluation method. The results showed that when adding 200 mg/L CQ-HS，the corrosion rate of carbon steel was controlled below 0.076 mm/a at the temperature of 80℃ and CO2 partial pressure of 9.0 MPa. The anti-scale rate was 80% when 200 mg/L CQ-HS was adding into the field water. Under the supercritical CO2 condition，the CQ-HS could possess theadvantages of corrosion and scale inhibition，and be used as a multi-function treatment agent.

10.19346/j.cnki.1000-4092.2019.03.017