Research Progress of the Stability and Demulsification Mechanism of the Water-in-Crude Oil Emulsion

The influence of natural surfactants,such as asphaltenes,resins,solid particles and naphthene,on the stability of the water in crude oil emulsion are summarized.The mechanism of crude oil′s demulsification is discussed,as well as the relationships of the composition,HLB value,amount and combination of the demulsifier to the demulsifying dehydration of crude oil.Several series of demulsifiers employed popularly inland nowadays are presented.