A combined chemical cleaning?thermal steam air floatation process was established to treat oil sludge,and the conditions of the combined process were investigated meticulously. Meanwhile, the self?synthesized WP?1 was taken as the main cleaning agent, and the cleaning effect of WP?1 was evaluated by the solid?phase oil content upon treatment. The results reveal that the optimal conditions for the combined process include a mud?to?water ratio of 1 : 3, a cleaning temperature of 80 ℃, an agitation rate of 200 r/min, cleaning time of 1.5 h, holding time of 15.0 min, and thermal steam air floatation of 1.0 h. Thermal steam air floatation solves the problem of suspending and sinking oil particles with large specific gravity in the cleaning process. Under optimal conditions, the solid?phase oil content decreases to 1.2%, meeting the oil sludge treatment standards stipulated in SY/T 7301-2016. The oil removal rate is as high as 92.08% when WP?1 is combined with 0.1 g of sodium silicate, which demonstrates a high price?performance ratio and is of good application value.

A demulsifier DW1 was prepared by emulsion copolymerization.The demulsifier DW1 was characterized by FT?IR,GPC,¹H?NMR,¹³C?NMR and particle size analysis.The demulsification experiment using DW1 as demulsification system was carried out with Xinjiang sludge as the target treatment object,and the sludge before and after treatment was analyzed by sem.The results showed that the synthetic demulsifier DW1 had M_w of 13.9×10⁵ and M_n of 8×10⁵,molecular weight distribution index of 1.73,D₅₀ of 26.00 μm,average particle size of 25.00 μm,non?uniform particle size distribution,and good stability of DW1.The demulsification experiment shows that the oil removal rate of DW1 on a Xinjiang oil field can reach 99.55%.