Analysis of influence factors on ultra heavy oil dehydration rate

The ultra heavy oil of Liaohe oilfield is highly viscous, high density, highly emulsifying, and has little density contrast between oil and water. The dehydration process is slow and long by using two-stage thermo-chemical setting dehydration. Experimental analysis has been conducted to determine the influence of temperature, demulsifier concentration and composite strength on dehydration rate of ultra heavy oil. The result shows that, the dehydration rate can be effectively improved by controlling demulsification and dehydration temperature between 85～95℃, demulsifier concentration 300～400 mg/L and composite strength 500～800 r·p·m.