U-shaped tube heat exchange closed cycle downhole thermoelectric power generation system and method

Abstract

The invention relates to a U-shaped tube heat exchange closed type circulating underground thermoelectric generation system and method. The system comprises a shaft, a fluid circulating module and anelectric energy output module, wherein the shaft comprises a sleeve, an oil tube, a thermoelectric generation module, a cold fluid injection tube and a U-shaped tube heat exchanger; the part, on a production layer, of the sleeve is provided with a perforation section; an oil sleeve annulus flowing channel is formed in a space between the inner wall of the sleeve and the outer wall of the thermoelectric generation module; an oil tube flowing channel is formed in the inner space of the oil tube; the cold fluid injection tube is arranged in the oil sleeve annulus flowing channel or the oil tube flowing channel; and the fluid circulating module comprises a cold fluid injecting pipeline, a cold fluid injecting pump, a cold fluid flow-out pipeline, a cold fluid storage container, a cold fluid flow-in pipeline, a hot fluid utilization module, an oil sleeve annulus return fluid flowing pipeline and an oil tube return fluid flowing pipeline. The U-shaped tube heat exchange closed type circulating underground thermoelectric generation system can realize heat removing to generate power without removing water, provides stable electric energy supply, and does not affect follow-up utilization ofheat exchange fluid.

Description

technical field [0001] The invention belongs to the technical field of geothermal power generation, and in particular relates to a U-shaped tube heat exchange closed circulation downhole thermoelectric power generation system and method. Background technique [0002] Geothermal energy is a renewable energy source from deep within the earth. The global geothermal potential resources are about 450,000 times the current global energy consumption. As a new clean green energy, the rational development and utilization of geothermal resources has become more and more popular under the circumstances that people's awareness of environmental protection is increasing day by day and energy resources are increasingly scarce. [0003] Geothermal power generation is the most important way of geothermal utilization. According to the heat carrier type, temperature, pressure and other characteristics, geothermal power generation methods can be divided into two categories: steam type geother...

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Problems solved by technology

These methods all need to extract the thermal reservoir fluid to the ground and then generate electricity. A large amount of thermal reservoir fluid exploitation will bring about problems such as potential formation subsidence and wellbore fouling, which restricts the development of geothermal power generation to a certain extent.

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