The emulsion system composed of waste oil base mud in gas fields is characterized by its complex composition and stable properties,posing significant challenges in its management.Untreated direct discharge of such mud would inflict substantial environmental damage.The application of a chemical demulsification-ultrasonic-centrifugation method was employed for its treatment.The results show that when the chemical demulsifier pH of 5-6,AR36 demulsifier dosage of 8 mg/L,temperature of 60 ℃,stirring time of 40 min at 200 r/min,ultrasonic frequency of 25 kHz,power of 30 W,ultrasonic time of 11 min,cationic PAM dosage of 60 mg/L,stirring time of 15 min,centrifuge speed of 3 000 r/min,and centrifuge time of 20 min,oil recovery and reduction rate are above 94％.Additionally,the water content in the recovered oil is reduced below 0.5％,and the oil content in the sediment is minimized to less than 5％.The results of SEM analysis demonstrate that the stable emulsifiication state of oil-water-solid can be disrupted under the synergistic influence of demulsifier and ultrasound.
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