Optimization and compositional formulation of crude oil demulsifier in Jinghe oilfield

Aiming at the problems in Jinghe oilfield,such as big density of crude oil,high nonhydrocarbon and asphaltic components,big difficulty in dehydration and big dosage of demulsifier,the determination on 6 kinds of demulsifier dehydration effect of 20% water cut of heavy oil has been carried out.The dehydration effect of single demulsifier,25-A and HL-1 is superior to other demulsifiers,and the demulsification temperature is 65 ℃.When the concentration of demulsifier is 600 mg/L,the dehydration ratea are 65.6% and62.5% respectively.The dehydration effect of compositional formulation of crude oil demulsifier is obviously better than the single demulsifier.Under the same conditions,the dehydration rate can be higher 15.7%.Through demulsifier concentration and demulsification analysis of the influence factors,the optimal demulsification conditions for Jinghe oilfield are as follows:the demulsifier concentration of 400 mg/L,the mixed compositional proportion of 2:1,demulsification temperature of 80 ℃,and the dehydration rate could reach 94.5% after 10 h settling.