Abstract:In view of the difficulty in the treatment of oil sewage in heavy oil injection oilfields,bisphenol-A,formaldehyde and triethyleneteramine were used as raw materials to synthesize phenolamine resin,and the phenolamine resin was used as the starting agent to synthesize a series of multi-branched,polyamine-based,polyphenyl cyclic type clearing agent.Clearing agents were evaluated on the basis of adding the clearing agent for a certain period of time,the oil content of the sewage dropped below 20mg/L as the evaluation standard.The results show that when the clearing agent F-14 and F-15 are compounded at a ratio of 2:1,the oil content of the sewage can be reduced to 18 mg/L within the specified time,which meets the standard requirements.A field pilot test was carried out in a heavy oil oilfield in the Bohai Sea.The results showed that the oil content of injection water is stable below 20mg/L,which meets the technical requirements of the field.