Abstract
The water temperature at the outlet of the production well is an important index for evaluating efficient geothermal exploration. The arrangement mode of injection wells and production wells directly affects the temperature distribution of the production wells. However, there is little information about the effect of different injection and production wells on the temperature field of production wells and rock mass, so it is critical to solve this problem. To study the influence mechanism of geothermal well arrangement mode on thermal exploration efficiency, the conceptual model of four geothermal wells is constructed by using discrete element software, and the influence law of different arrangement modes of four geothermal wells on rock mass temperature distribution is calculated and analyzed. The results indicated that the maximum water temperature at the outlet of the production well was 84.0 °C due to the thermal superposition effect of the rock mass between the adjacent injection wells and between the adjacent production wells. Inversely, the minimum water temperature at the outlet of the production well was 50.4 °C, which was determined by the convection heat transfer between the water flow and the rock between the interval injection wells and the interval production wells. When the position of the model injection well and production well was adjusted, the isothermal number line of rock mass was almost the same in value, but the direction of water flow and heat transfer was opposite. The study presented a novel mathematical modeling approach for calculating thermal exploration efficiency under various geothermal well layout conditions.
Highlights
The water temperature at the outlet of the production well is an important index for evaluating efficient geothermal exploration
Fractures V1 and V4 were developed as injection wells whereas V2 and V3 as production wells
Fractures V 1 and V4 were taken as production wells, V 2 and V3 as injection wells; Fractures V 1 and V 2 were constructed as injection wells, V 3 and V 4 as production wells; Fractures V 1 and V3 were constructed as injection wells, V2 and V4 as production wells
Summary
The water temperature at the outlet of the production well is an important index for evaluating efficient geothermal exploration. Through comparative analysis, the law of the influence of different geothermal well layouts on the rock mass water flow and heat transfer temperature is revealed.
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