Kravchenko I. Processes and systems of transformation of geothermal energy produced by oil and gas fields

Object of research: heat-mass-exchange processes of the transformation of constituent subterranean fluid for decomposition, hot water supply and electrogeneration. The purpose of the work: creation of a scientific and methodological basis for engineering calculations of the main technical and operational parameters of autonomous systems of heat supply and power generation in which as a source of energy geothermal potential is used, timed to the produced oil and gas fields, including concentrated in natural gas, dissolved in thermal water, and as a technical means for its development - a park of finished oil and gas extraction and auxiliary wells. Research methods: The solution of the set tasks, scientific positions, conclusions and recommendations set out in the dissertation are based on the methods of the theory of heat and mass transfer in homogeneous and heterogeneous environments, methods of computational mathematics, methods of analysis of experiments with many factors taking into account thermodynamic processes and their consequences. . Novelty: - the reasons for the necessity, expediency and economic efficiency of the use of the remaining energy potential of the produced oil and gas deposits concentrated in the associated geothermal fluid in the form of both heat of thermal water and natural gas dissolved in them, are elaborated, with the development of the method of numerical calculations of this integrated potential; - a new mathematical model was developed and an analysis of heat and mass transfer processes was carried out during accumulation and extraction of geothermal energy by a single-well circulating system; the dependence of the temperature of the extracted heat carrier from the speed of its circulation, carried out by means of the technological equipment of the system, and the possible daily loads of the conditional component of this heat carrier; - Optimization of the technological process of separation and use for the generation of electrical energy of gas dissolved in a thermal fluid on the produced oil and gas fields; For the first time, for the hydrogeological conditions of Ukraine, three variants of the hybrid scheme of geothermal power plants have been developed on low-potential gas-saturated heat carrier, characteristic for the geothermal field of Ukraine, with the drive of electric generators as turbines working on low boiling working body and gas-piston internal combustion engines (GPAs), with simultaneous beneficial use the heat of the exhaust gas of the GPA in the working circuit of the turbine. Implementation of the results of the work: The results of the work were used in the research according to the target research program of the National Academy of Sciences of Ukraine for 2016. (Resource-2) jointly with ITTP NAS of Ukraine (Contract No. 1-6 / 16 dated 01.07.2016 "Investigation of geothermal properties of produced oil and gas fields and technological possibilities of their use in thermal and electric power generating technologies." Search and evaluation of priority deposits ".