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U-shaped tube heat exchange closed type circulating underground thermoelectric generation system and method

A thermoelectric power generation and U-shaped tube technology, which is applied in geothermal energy systems, geothermal energy, heating fuels, etc., can solve the problems of restricting the development of geothermal power generation, formation subsidence, wellbore scaling, etc., and achieve heat generation without water extraction. , the effect of reducing emissions and stabilizing power supply

Active Publication Date: 2018-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all need to extract the thermal reservoir fluid to the ground before generating 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.

Method used

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  • U-shaped tube heat exchange closed type circulating underground thermoelectric generation system and method
  • U-shaped tube heat exchange closed type circulating underground thermoelectric generation system and method
  • U-shaped tube heat exchange closed type circulating underground thermoelectric generation system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 The shown U-tube heat exchange closed-cycle downhole thermoelectric power generation system includes a wellbore 112, a fluid circulation module 200, and an electrical energy transmission module 302.

[0047] Further, the wellbore 112 includes a casing 103 that is drilled through the overlying strata 102 and the production layer 101 in sequence from top to bottom, a tubing 105 embedded in the casing 103, and thermoelectric power generation placed on the outer wall of the tubing 105 The module 104, the cold fluid injection pipe 106, and the U-tube heat exchanger 107 embedded in the sleeve 103 located in the production layer. The casing 103 is provided with a perforation section 113 on the part where the production layer 101 is located. The top of the tubing 105 is flush with the top of the casing 103, and the bottom is located at the junction of the overlying stratum 102 and the production layer 101 of the production layer.

[0048] Specifically, the producti...

Embodiment 2

[0069] Such as Figure 4 The U-tube heat exchange closed-circulation downhole thermoelectric power generation system in the case of tubing injection is shown, and figure 1 The difference of the U-tube heat exchange closed-circulation downhole thermoelectric power generation system in the case of the oil jacket annulus injection in the first embodiment shown is that the cold fluid injection pipe 106 is inserted from the oil pipe 105, that is, the cold fluid injection pipe 106 is arranged in the oil pipe flow channel 402. Part of the cold fluid diverted from the downhole diverter 108 enters the tubing flow channel 402, and flows upwardly from the surface along the tubing flow channel 402. The U-tube heat exchanger 107 communicates with the cold fluid injection pipe 106 through a through-type tubing plug 110. The U-tube heat exchanger 107 passes through the through packer 109 to communicate with the oil jacket annulus flow channel 401. Specifically, the lower end of the cold flui...

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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 the depths of the earth. The potential global geothermal resources are approximately 450,000 times the current global energy consumption. As a new clean and green energy, with people's increasing environmental awareness and energy shortage, the rational development and utilization of geothermal resources has become more and more popular. [0003] Geothermal power generation is the most important way to use geothermal energy. According to the different types of heating medium, temperature, pressure and other characteristics, geothermal power generation can be divided into steam-type geothermal power generation and hot water-type geothermal power generation. Steam-ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03G4/00F24T10/17
CPCF03G7/04
Inventor 刘均荣史开源杜鹏王哲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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