Study On Comprehensive Optimization Of Geothermal Energy Production Pattern Based On Surface And Underground

With the rapid development of economic construction,China's energy consumption increases year by year.Energy has become an important issue that restricts China's development.Geothermal energy is widely distributed on the earth.It is a renewable and clean energy with wide development prospects and high utilization value.However,how to exploit geothermal energy efficiently has become a bottleneck restricting the utilization of geothermal energy.In this context,this paper proposes to improve the efficiency of geothermal exploitation and reduce the development cost through the research and optimization of geothermal well network based on the surface and underground comprehensive optimization of geothermal well network.On the basis of domestic and foreign literature research,this paper summarizes the main factors affecting the geothermal development process.The whole geothermal energy development process is divided into four modules,namely,the inflow section,the horizontal section,the outflow section and the ground manifold.The differential expressions of heat transfer model and pressure drop model are established respectively.Based on the study and analysis of steady heat transfer model,unsteady heat transfer model and heat transfer coefficient of the wellbore,heat transfer models of the inflow section,horizontal section and outflow section were established respectively on the basis of the law of conservation of energy.Based on the law of conservation of energy,the pressure drop models of the inlet section,horizontal section,outflow section and surface manifold under laminar and turbulent conditions are established.On the basis of heat transfer model and pressure drop model,C#was applied to develop unit software to realize the calculation of heat transfer and pressure drop in the process of geothermal energy development,as well as the optimization of wellhead location and the drawing of heat transfer and pressure drop curve.By using the heat transfer and pressure drop model,the parameters of one injection-multiple injection-injection pattern and double butt U-pattern pattern were compared and optimized.Through the two given regional geothermal development of geothermal energy development well pattern design,the early stage of the application of the established model of scheme comparison,the realization of well pattern optimization,improve the integration of geothermal energy development to plan as a whole on the ground,underground and differentheating units with different heating and well pattern,provides the basic way to improve geothermal energy development and comprehensive benefits,to accelerate the development of geothermal energy development and application,optimize geothermal energy development has important significance.