Fluoride retention by sandy soils
Despite low concentrations of factors associated with fluoride binding in soils, the soils investigated in this study showed high soluble fluoride retention rates varying from 94.9 to 98.4% even at very high fluoride application rates. It was concluded that the illuvial (B) horizon and to a lesser extent, the mineral (A) horizon were responsible for most of the fluoride fixation. With increased time it was found that less fluoride was leached and the bonding between fluoride and soil binding factors was increased.
According to Mazhai Oil Field's hostile sandstone reservoir factors,we introduce HD surfactant.Laboratory tests indicate that the HD surfactant suit high salt and high temperature oil floor,and can improve effectually oil quality.6 well times of injection well Permeability control jobs were completed,the cumulative increased oil was 2937t.Thus HD surfactant suit Mazhai Oil Field.So HD is a good oil displacement agent.