蒙脱石与土酸反应的实验研究  

AN EXPERIMENTAL STUDY ON REACTION OF MONTMORILLONITE WITH MUD ACID

作　　者：韦莉[1] 田玉玲[1] 

机构地区：[1]北京石油勘探开发科学研究院采收率所

出　　处：《油田化学》1998年第3期237-240,共4页Oilfield Chemistry

摘　　要：本文详细介绍了粘土矿物中的蒙脱石在土酸中的溶蚀及沉淀规律，考察了作用时间。温度、酸浓度及国／液比对蒙脱石与酸反应的影响。研究结果表明：蒙脱石与土酸反应的总溶蚀动力学规律与Elovich动力学方程（C＝a＋blnt）符合最好。反应初期产生明显的Si（OH）4沉淀，沉淀在一小时内达到完全。土酸浓度过大时会产生氟硅酸盐沉淀。反应后期还会产生氢氧化物沉淀。在高固／液比条件下，蒙脱石与土酸反应产生的各类沉淀，比低固／液比条件下更为严重。The reaction of montmorillonite (M) with mud acid, 12% HCl+3% HF in most cases, is studied as influenced by time, temperature, M-to-acid ratio and acid concentration through determining the amount of dissolved mineral and the concentrations of ions Si4+, Al3+, Fe, and K+ in reacting acid. It is shown that the experimental data obtained are most fit to Elovich's kinetic equation (C=a+ b ln t). The Precipitation of Si(OH)4completes with 12% HCl+3% HF at pH=1 in 1 hr and that of Na2SiF6 occurs when the concentrations of acids are high and is enhanced at high M-to-acid rations.

关 键 词：蒙脱石 土酸 酸岩反应 酸化 提高采收率 油田 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]