System and method for heating underground oil-rich coal by adopting oil vapor phase change

The invention discloses a system and method for heating underground oil-rich coal through oil vapor phase change. The system comprises an underground coal seam, a heat injection well, a production well, a water vapor generator, an oil vapor generator, a fractionating furnace and other components. The oil vapor is adopted as a heat-carrying medium, and a large amount of heat energy is released through injection of the oil vapor and condensation phase change in the underground coal seam, so that rapid heating of the coal seam is realized, and the process of extracting the oil gas is further realized. The method focuses on a phase-change heat exchange method between a heat-carrying medium and a coal seam, a large amount of latent heat of vaporization released in the condensation process is utilized, heat exchange is enhanced, the rapid and energy-saving oil gas extraction process is completed, the size of components in the system is reduced, large-scale efficient development of oil-rich coal resources is facilit