利用废弃油井和地下高温溶腔开采地热能的数值模拟

heat transfer system, which uses oil wells abandoned as its injection and production well and hot cavity as its geothermal reservoir, is studied in this paper. The 2D model of injection and production well is established, and its energy partial differential equations are discretized by finite difference method and solved through alternating direction implicit difference method (ADI). The 3D model of hot cavity is set up considering its porous property, and numerical analysis is developed in FEM software Fluent. The property of working fluid in this paper uses real gas model from the database provided by NIST. The various property of fluid is took into account in the whole analysis, and the temperature of fluid at the system's outlet are studied, which is changing as running time, geothermal gradient, inlet pressure, temperature at inlet, mass flow rate, rock's porosity and different working fluid. The result indicate that temperature at inlet, geothermal gradient and mass flow rate is the most important factors affecting temperature at outlet, so these factors should be considered in the actual process of exploitation. The study in this paper will provide valuable reference in theory at the field of geothermal power generation and geothermal exploitation by oil wells abandoned.