适用于酸性高密度压井液的缓蚀剂WX1A的制备与性能研究

Preparation and Property of Inhibitor WX1A Used for High-density and Solid-free Well Killing Fluid

王健 王煦 钟志刚 敬雅雪 简璐 谷琦琦

WANG Jian，WANG Xu，ZHONG Zhigang，JING Yaxue，JIAN Lu，GU Qiqi

为减小以提盐废卤为基液制备的酸性高密度无固相压井液的腐蚀性，以二乙醇胺、甲醛和苯乙酮为原料采用正交实验法制备了一种适用于该类压井液的醛酮胺类缓蚀剂WX1A，利用失重法、电化学分析和SEM扫描电镜研究了该缓蚀剂对N80、P110 钢片在压井液（以pH为3 的普钙老水制备的酸性高密度无固相压井液）中不同条 件下的缓蚀效果。结果表明：在二乙醇胺、甲醛、苯乙酮摩尔比1.2:2:1.2，反应温度110℃，反应时间10 h，反应pH1 条件下合成的缓蚀剂WX1A的缓蚀效果最佳；该缓蚀剂的最佳用量为80 mg/L，在此加量下，当温度从60℃升至80℃，缓蚀剂WX1A对N80 钢片和P110 钢片的缓蚀率从87.07%和88.09%分别增至93.12%和92.62%；在密度1.6、1.7、1.8 g/cm3 的压井液中，缓蚀剂WX1A 对N80 钢和P110 钢片的缓蚀率均在90%上，在120℃、2 MPa 和150℃、4 MPa条件下缓蚀剂WX1A在密度1.6 g/cm3的压井液中对N80 和P110 钢片的缓蚀率均达到94％以上。压井液中添加该缓蚀剂后，缓蚀剂通过吸附在金属基体表面形成较为完整的保护膜，自腐蚀电流密度从10-4 A/cm2降低到10-5A/cm2，降低了压井液对普通碳钢的腐蚀性。图5 表7 参16

In order to reduce the corrosion of the high-density and solid-free well killing fluid made by the waste acidic brine，a high temperature corrosion inhibitor WX1A was synthesized using diethanolamine，formaldehyde and acetophenone as the raw materials and with the orthogonal experiment method. The performance of the inhibitor WX1A was researched by utilizing weight loss method，electrochemical method and SEM method for the N80 and P110 steel in the well killing fluid（acid high-density and solid-free well killing fluid with pH of 3 made by the ordinary calcium old water）. The results showed that when the molar ratio of the reactant mole ratio of diethanolamine，formaldehyde and acetophenone was 1.2∶2∶1.2，the reaction temperature was 110℃ ， reaction time was 10 h and the reaction pH was 1，the obtained corrosion inhibitor WX1A had the best inhibiting effect. When the temperature rose from 60℃ to 80℃ at the best WX1A concentration of 80 mg/L，the inhibition efficiency of WX1A on the N80 and P110 steel increased from 87.07% and 88.05% to 93.12% and 92.62%，respectively. The inhibition efficiency of WX1A on the N80 and P110 steel could reach above 90%，respectively，in the well killing fluid with the density of 1.6，1.7 and 1.8 g/cm3 at the WX1A concentration of 80 mg/L. Furtherly，the inhibition efficiency of WX1A on N80 and P110 steel in the well killing fluid with the density of 1.6 g/cm3 was above 94%，respectively，at the high temperature and pressure of 120℃，2 MPa and 150℃，4 MPa. A complete protection film formed on the surface of a metal matrix when the inhibitor WX1A was added in the well killing fluid，and the corrosion electric current reduced from 10-4A/cm2 to 10-5A/cm2，as a result，the corrosion of ordinary steel reduced in the well killing fluid.

10.19346/j.cnki.1000-4092.2016.03.006