The effective factor of regulating of rheophysical characteristics of liquid systems in oil recovery is use of physical and physical-chemical methods. The convincing outcomes of applying of physical-magnetic and electric fields are obtained on thermodynamic properties of liquid systems in processes of oil recovery, cleaning of propellant and oils, etc. Results of theoretical, experimental, and field studies and applying of the new methods of increasing of oil recovery efficiency by treating of aqueous systems by electric and magnetic fields are observed.