The creation of oil emulsions due to mechanical strength and natural surfactants during production is undesirable. The challenges associated with transporting and refining oil have led researchers to probe into practical demulsification methods. An in-depth understanding of crude oil rheology and operating conditions to treat emulsion is necessary. The main objective of the current study was to investigate the theological behavior and demulsification rate of crude oil emulsions. The rheological behavior of a crude oil emulsion was studied by manipulating its temperature (30 degrees C-90 degrees C), shear rate (0.1-1000 s(-1)), and water volume fraction (20%, 30%, and 40%). For emulsions of various water content, the rheological studies followed the non-Newtonian shear thinning behavior, which was explained effectively by the Herschel-Bulkley model. Experimental results also indicated that the measured viscosity of emulsion decreased significantly with temperature, while increasing water volume fraction increased viscosity. The rates of demulsification of water in crude oil emulsion in direct current fields were investigated under various conditions by using an electrochemical cell. The separation rate of water increased along with the applied field, water content, and salt concentration. Results of this study indicated that emulsion separation was governed by the magnitude of the applied electric field as well as the type of electrode.