This article deals with the measuring of part of the hardly exploiting oil from the general oil reserves (Heavy Oil).The work includes the study of the specificities of the occurrence of such anomalous viscosities, the effect on structurally formed oil, the given applicable methods, the capacity of reducing the emergence of thixotropic properties of viscous oil. The technique of experimental researches and results of studying the influence of the plasma-pulse action based on the rheological properties of a highly viscous oil deposits is analysed.