Presented are results of the studies, conducted by method of di-electric spectroscopy of phase transitions in residiual oil and interstitial water. Given is an evaluation of the degree of influence of phase transitions in formation oil, interstitial water and displacing agent, revealed during oil displacement by different agents, on efficiency of such process.

Reviewed are the results of researches on formation fluids. done by dielectric spectrometry method and paramagnetic sondes. It is shown, that increased rate of fluids gelation during oil displacement process is the main reason for noticeable reduction of oil recovery efficiency, when using physical-chemical methods of oil recovery enhancement.