“…When dosing a demulsifier into crude oil, a redistribution of oligomer homologues occurs in oil-water and oil-water emulsions. Monoesters with relatively low n values, i.e., the most hydrophobic components are distributed in water-oil emulsions, and components with relatively high n values, i.e., relatively hydrophilic components pass into the oil-water emulsion [35] . Due to a similar redistribution of oligomer homologues in crude oil, the phenomenon of simultaneous destruction of water-oil and oil-water emulsions occurs and as a result, commercial oil is obtained with a water content of no more than 0.5%, as well as produced water (formation water) with an oil content of no more than 50 mg/dm 3 , which comply with current standards [20,21] .…”