Synthesis of humic cationic polymer and the treatment of wastewater of oilfield

摘要

Treating and reinjecting the wastewater of oilfield is a correct way to develop and use water resources at present. A novel-type humic cationic polymer was synthesized using humic acid (HA), dimethylamine (DMA), and epichlorohydrin (ECH) by aqueous solution polymerization. The optimal reaction conditions were determined. The reaction temperature was 65 degrees C, the reaction time was 6.0h, m (HA):m (ECH):m (DMA)=1.0:13.9:15.0. The oil removal efficiency and viscosity reduction effects were investigated using the polymer-flooding wastewater of Daqing oilfield. The results showed that humic cationic polymer had good effect on viscosity reduction, polymer removal, and oil removal of the polymer-flooding wastewater. The wastewater after being treated can provide as reinjection water for chemical flooding, which also improve the utilization of the wastewater.