高温碳酸盐岩自生酸酸液体系研究

Study on Self-Generating Hydrochloric Acid System for High-Temperature Carbonate Rock

关键词:  自生酸  高温  反应速率  碳酸盐岩  酸化

Key words:  self-generating hydrochloric acid  high temperature  rate of reaction  carbonate rock  acidizing

摘要:

以高温下反应能产生HCl的物质A和B以及水解产生羟基氯乙酸的氯乙酸盐I为生酸母体,调配出了一种适合高温碳酸盐岩储层改造的自生酸,对其性能进行了研究。高温下,自生酸释放出的有效H+浓度达3.8mol/L以上,有效溶蚀率达72%以上,能对碳酸盐岩储层起到较强的溶蚀作用,且酸岩反应时间大于1h,能起到深部酸化的作用,对N80碳钢的动态腐蚀速率可控制在60g/m2.h以内。岩芯流动实验和扫描电镜实验验证了自生酸在高温下对碳酸盐岩储层的改造能力,其改造效果明显优于其它酸。

Abstract:

At high temperature,A and B can produce HCl,chloroacetic I can produce hydroxyl chloroacetic acid.We took the A,B and I as the parent acid,deployed a self-generating hydrochloric acid for high-temperature carbonate rock,and studied its performance.At high temperature,the self-generating hydrochloric acid can release hydrogen ion with a concentration of over 3.8 mol/L,effective dissolution rate of over 72%,which has a strong dissolution to carbonate rock reservoir.And the acid rock reaction time is greater than 1 h which can play a role of deep acidification.The dynamic corrosion rate can be controlled in 60 g/m2 ·h with N80 carbon steel.Core flow test and scanning electron microscopy experiments verify the acidification of the self-generating hydrochloric acid at high temperature,and the effect of acidification is better than the other’s.