Experimental Study On Demulsification And Dehydration Of Liaohe Heavy Oil

With the development of large oil fields in China,the exploitation of ordinary light crude oil gradually reaches the saturation state,and the exploitation degree and scope of heavy oil are getting larger and larger.Heavy oil has the characteristics of high viscosity,high density and high content of colloid and asphaltene,which makes the dehydration of heavy oil emulsion more difficult.Due to the wide application of chemical oil recovery,the heavy oil emulsion contains more emulsifiers artificially added,which makes it more difficult to dehydrate the emulsion.Therefore,it is necessary to study the effect of emulsifiers on the stability of heavy oil emulsion.Moreover,in order to further improve the dehydration effect of heavy oil emulsion,it is necessary to study a new method of demulsification dehydration based on chemical demulsification,which makes the demulsification dehydration of emulsion more economical and efficient.In the process of heavy oil recovery,a variety of emulsifiers are usually added to the water to improve oil recovery efficiency.Sodium petroleum sulfonate is a common emulsifier.Firstly,the effects of emulsifier sodium petroleum sulfonate on apparent viscosity,oil-water interfacial tension and dehydration rate of emulsion were studied.Moreover,the effects of inorganic salts on apparent viscosity,oil-water interfacial tension and dehydration rate of emulsion in the presence of sodium sulfonate were investigated.The influence of emulsifier sodium sulfonate and inorganic salt on emulsion emulsification was analyzed.The effects of two demulsifiers on apparent viscosity,oil-water interfacial tension and dehydration rate of sodium sulfonate emulsion were studied.And the effects of temperature and demulsifier on the phase transition point of emulsion were analyzed.Moreover,the effects of magnetic treatment on the apparent viscosity and oil-water interfacial tension of the emulsion were studied,and the effects of magnetic treatment intensity,magnetization time and water content of the emulsion on the dehydration rate of the emulsion were further investigated.The feasibility of magnetic nanoparticles for demulsification and dehydration of heavy oil emulsion was verified by experiments,and the basic principle of demulsification and dehydration of magnetic particles was analyzed.