新型耐高温酸化缓蚀剂XAI-180的研发与性能评价

为了使缓蚀剂适用于高温深井酸化施工的恶劣工况,提高其高温缓蚀综合性能,以曼尼希碱季铵盐和喹啉季铵盐复配物作为缓蚀剂主剂,通过协同优选复配增效剂和助溶剂等辅剂,采用正交实验完成了高温酸化复合缓蚀剂XAI-180的配方设计,结合失重法和电化学测试分析法评价了XAI-180的缓蚀性能。研究结果表明:①自制的曼尼希碱季铵盐缓蚀剂与喹啉季铵盐缓蚀剂复配主剂形成了明显的协同效应,当两者配比为21∶5时,缓蚀效果为最佳;②高温缓蚀剂XAI-180是一种既可以抑制阴极反应,又可以抑制阳极反应的混合控制型缓蚀剂;③在加入5%酸化缓蚀剂XAI-180、180℃的条件下,N80钢片在盐酸浓度为20%的常规酸中腐蚀速度为70 g/(m~2·h),在0.4%胶凝剂和0.8%胶凝剂的体系中的腐蚀速率分别为92.3 g/(m~2·h)、95.8 g/(m~2·h)。结论认为,高温酸化缓蚀剂XAI-180在180℃、20%盐酸浓度的胶凝酸体系中具有配伍性好、缓蚀性强等优点,能满足180℃以上储层酸化压裂施工的要求。

Research,development and performance evaluation of XAI-180, a new acid corrosion inhibitor with high temperature resistance

In order to make corrosion inhibitors applicable to the harsh working conditions of acidizing construction in high-temperature deep wells and improve their comprehensive performance of corrosion inhibition at high temperature, this paper took the combination of Mannich base quaternary ammonium salt and quinoline quarternary ammonium salt as the main inhibitor, and synergistically selected and prepared auxiliaries, e.g. synergists and auxiliary solvents. Then, the formula design of composite acid corrosion inhibitor XAI-180 with high temperature resistance was completed by means of orthogonal experiments. Finally, the corrosion inhibition performance of XAI-180 was evaluated by virtue of the weightlessness method and electrochemical test and analysis method. And the following research results were obtained. First, the combination of a self-made Mannich base quaternary ammonium salt inhibitor and a quinoline quaternary ammonium salt inhibitor presents an obvious synergistic effect, and the inhibition effect is the best when their ratio is 21:5. Second, the corrosion inhibitor XAI-180 with high temperature resistance is a kind of a mixed control inhibitor, which can inhibit both cathodic and anodic reactions. Third, when 5% acid corrosion inhibitor XAI-180 is added, under the temperature of 180 ℃, the corrosion rate of N80 steel sheet is 70 g/(m2·h) in the conventional acid system with hydrochloric acid concentration of 20%, and 92.3 g/(m2·h) and 95.8 g/(m2·h) respectively in the system with 0.4% and 0.8% gallant. It is concluded that acid the corrosion inhibitor XAI-180 with high temperature resistance has the advantages of good compatibility and strong corrosion inhibition in a gelling acid system with hydrochloric acid concentration of 20% at 180 ℃, and it can meet the needs of acid fracturing in the reservoirs above 180 ℃.