油田酸化压裂废液中F-在土壤中的迁移规律研究

通过土柱实验研究了大庆油田酸化压裂废液中氟离子(F-)对土壤环境的影响,考察了酸化压裂废液中不同浓度的F-在土壤中的迁移转化规律,以及不同酸度、不同的土壤质地对F-在土壤中的迁移规律的影响.并探讨了相关作用机理.结果表明,油田酸化压裂废液中F-对土壤环境产生明显的影响,随着废液中F-浓度增加,F-在黑钙土中的迁移深度增加;沿土壤深度方向发展,土层中F-含量呈现降低趋势;随着F-浓度的变化,F-在黑钙土中的迁移基本符合负指数y=y0+a·exp(-x/t)规律;而随着压裂废液中酸度的增加,土壤中粘土矿物Ca2+,Al3+等阳离子浓度增高,与水中氟形成难溶化合物,从而使得F-在土壤环境中的迁移深度反而降低;F-在大庆地区3种典型土壤中的迁移深度符合黑钙土>黄土>碱土的规律;油田酸化压裂废液中F-主要存在于在10 cm深度的土壤表面层.

The Migration Rules of Fluoride Ion from Waste Acid Fracturing Fluid in Soil

In process of oil production, acidification is a necessary operation to increase output, though it will produce wastes, especially the acid ingredient including hydrofluoric acid, hydrochloric acid, vitriol, etc. In this paper, the influence of fluorin ion(F-)in waste acid fracturing fluid on the soil environment of Daqing oil field was studied by earth column experiments. The concentration of F-, acidity and different typical terrene soils on the influence of the migration rules and characteristics of Fin ...