Simulation and calculation of head of circulation power equipment for large volume single well circulation heat exchange in layered heat storage

Based on the existing heat transfer models of fractured and stratified heat reservoirs at home and abroad, this paper proposes a single well circulation heat transfer technology without water transfer that is suitable for the stable stratified heat reservoir in Guantao Formation in Hebei Plain.The technology uses the packer to divide the heat storage section into upper and lower layers with the waterproof layer as the boundary.In the middle, the insulation pipe is put down, and the upper layer is pumped.The top is the underground heat exchanger, and the soft water is the heat exchange medium.Geothermal wells in the eastern part of the Hebei Plain as an example, according to the golden section proportion configuration insulation pipe diameter, according to the pipe structure, fluid velocity, viscosity coefficient, kinematic viscosity to determine the Reynolds Number, draw the Moody Figure, division of fluid state, select on-way resistance coefficient of empirical formula, the simulation of geothermal fluid frictional head loss, the local head loss, appreciation and kinetic energy head, determine the cycle power equipment head.At the same time, it is found that the local head loss is 0.23%-0.44% of the drag head loss along the path, and the main head loss is the drag head loss along the path.When the circulating flow rate is 30 m³/h and 50 m³/h, the head is 121.631 m and 168.191 m, respectively.