Double-well re-injection geothermal exploitation system based on fracturing technology

Abstract

The invention discloses a double-well re-injection geothermal exploitation system based on a fracturing technology. The double-well re-injection geothermal exploitation system based on the fracturing technology comprises a first re-injection well, a second re-injection well and a water taking well arranged between the first re-injection well and the second re-injection well, wherein the water taking well is communicated with the first re-injection well and the second re-injection well through cracks in a heat storage layer respectively; the water taking well is connected with the heat release side inlet of a heat exchanger via a sand remover, the heat release side outlet of the heat exchanger is connected with the first re-injection well and the second re-injection well respectively, and the heat absorption side of the heat exchanger is communicated with the heating pipe network of a user. Because the water taking well is communicated with the first re-injection well and the second re-injection well by virtue of the cracks in the heat storage layer respectively, and the cracks are arranged in the heat storage layer, according to the double-well re-injection geothermal exploitation system based on the fracturing technology disclosed by the invention, geothermal tail water can be completely re-injected in the heat storage layer through the cracks to ensure the sustainable development of geothermal resources, thus reducing the adverse effects of the geothermal tail water on environment and ecology; meanwhile, when the geothermal tail water flows through the cracks, the heat exchange area of a fluid and the heat storage layer is greatly increased, and the heat exchange power is increased.

Description

technical field [0001] The invention relates to a geothermal development system, in particular to a dual-well recharge geothermal development system based on fracturing technology. Background technique [0002] As a clean and renewable energy source, geothermal resources are receiving more and more attention today when people's awareness of environmental protection is becoming stronger and stronger. With the wide application of geothermal energy, the use of geothermal energy for heating / power generation has attracted more and more attention. There are two types of traditional geothermal water extraction systems: non-recharge and recharge: the non-recharge system is only equipped with a production well, and the extracted geothermal water is sent to users or used for power generation, and then discarded after use; the recharge system is set to mine Wells and reinjection wells, the water pumped out of the production wells returns to the reinjection wells after the heat is rele...

AI Technical Summary

Problems solved by technology

It can be seen that the recharge system combined with the development method of indirect utilization of geothermal energy has great advantages, but the biggest problem of this geothermal development method is the low recharge rate of tail water, which will cause the hot water content in the heat storage to gradually decrease. The sustainable exploitation of geothermal resources cannot be guaranteed, and a large amount of tail water will have adverse effects on the environment and ecology

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