Three-dimensional numerical analysis of the influence of geothermal well inclination on thermal recovery efficiency
Due to the complexity of geological conditions of geothermal exploitation site,inclined drilling may occur during drilling.The research on the influence of geothermal well inclination on thermal recovery efficiency of rock mass is very rare.In order to study the influence of geothermal well inclination on thermal recovery efficiency,based on the conceptual model of geothermal well inclination,the evolution characteristics of rock mass temperature field,geothermal well temperature field and geothermal well outlet water temperature under varying geothermal well inclination were calculated and analyzed by discrete element program.The results show that:(1)With the increase of geothermal well inclination,the length of geothermal well is gradually shortened,the minimum temperature rise of model is gradually reduced,the heat flux density of rock mass and geothermal well becomes smaller,and the heat conduction rate of rock mass and geothermal well becomes slower.(2)The time required for the model to reach steady state is shortened with the increase of geothermal well inclination,and the outlet water temperature of geothermal well tend to be elevated with the increase of geothermal well inclination.The results can provide the important guiding significance for the influence law of geothermal well inclination on thermal recovery efficiency in practical thermal recovery engineering.
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