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Middle-deep layer geothermal energy closed heat exchange structure and process method

A heat exchange structure, deep underground technology, applied in the direction of geothermal energy, geothermal energy power generation, geothermal collectors, etc., can solve the problems of underground space loss, increased ground subsidence, and increased ground fissure activity.

Pending Publication Date: 2021-08-20
EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing mid-to-deep geothermal development models, the technology of pumping groundwater and then recharging water on the ground may lead to intensified ground subsidence, increased activity of ground fissures, and loss of underground space

Method used

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  • Middle-deep layer geothermal energy closed heat exchange structure and process method
  • Middle-deep layer geothermal energy closed heat exchange structure and process method
  • Middle-deep layer geothermal energy closed heat exchange structure and process method

Examples

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Effect test

Embodiment 1

[0042] Reference attached figure 1 As shown, when pipe laying construction can be carried out between Block A 1 and Block B 2 that need heat supply and the construction cost is lower than the construction cost of completing a single set of double-level butt-connected wells and a set of double-level butt-connected wells, it can be used The following heat exchange mode is used to collect mid-to-deep geothermal energy; the pipelines include underground pipelines 9 and aboveground pipelines 8, and each group of block shafts includes a shaft, the shaft is the first shaft 10 opened in Block A 1 and the first shaft opened in Block B The second vertical shaft 11 of block 2, the first vertical shaft 10, the second vertical shaft 11 and the horizontal shaft are laid with underground pipelines 9, and the heat exchange device 7 is a heat exchange station fixedly arranged between the first vertical shaft 10 and the second vertical shaft 11 , the heat exchange station communicates with the ...

Embodiment 2

[0044] Reference attached figure 2 As shown, when it is not possible to carry out pipe laying construction between Block A 1 and Block B 2 that require heating, or although pipe laying operations can be carried out, the construction cost is higher than that of completing a set of double-level butt-joint wells and double-horizontal section butt-joint wells In terms of construction costs, this heat exchange mode can be used to collect mid- to deep-layer geothermal energy; the pipelines include underground pipelines 9 and aboveground pipelines 8, and each group of block shafts includes two shafts, the shafts being the first shaft 10 and the second shaft 11 , the third vertical shaft 12 and the fourth vertical shaft 13, the first vertical shaft 10 and the third vertical shaft 12 are symmetrically opened in the A block 1, the second vertical shaft 11 and the fourth vertical shaft 13 are symmetrically opened in the B block 2, and the heat exchange device 7 is set At the wellhead po...

Embodiment 3

[0046] Reference attached image 3 As shown, in the urban space, the underground pipeline is complicated, and due to the small construction site, it is impossible to design the conventional wellbore structure in a small site. In order to avoid the interference of the underground wellbore When the flat well cannot meet the needs, the following heat exchange mode can be adopted. The horizontal well with double build-up section is used to collect the geothermal energy in the middle and deep layers. Increase the wellbore spacing to prevent the wellbore from being too close to the heat extraction effect. The heat extraction process is the same as the conventional double-horizontal horizontal well. The first horizontal well 16 connects the first vertical shaft 10 and the third vertical shaft 12. In the deflection section, the connection between the second horizontal well 17 and the second vertical shaft 11 and the fourth vertical shaft 13 is provided with an outward deflection secti...

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Abstract

The invention discloses a middle-deep layer geothermal energy closed heat exchange structure and a process method. The structure comprises a geothermal well ground pipe network layout mode and a geothermal well body structure and heat exchange mode; each mode comprises at least two sets of block vertical shafts; the bottoms of every two adjacent sets of block vertical shafts communicate through horizontal wells formed in a heat storage layer; pipelines capable of forming closed loops with the horizontal wells are laid in the block vertical shafts; heat exchange media are introduced into the pipelines; and heat exchange of the heat exchange media in the pipelines can be achieved through heat exchange devices located on the ground by means of every two adjacent sets of block vertical shafts. According to the middle-deep layer geothermal energy closed heat exchange process method provided based on the heat exchange structure, liquid with good heat transfer performance can be adopted for heat exchange, water is not needed for heat extraction, disturbance to underground space is small, and safety and environment friendliness are achieved.

Description

technical field [0001] The invention relates to the technical field of mid-deep geothermal energy collection, in particular to a mid-deep geothermal energy closed heat exchange structure and a process method thereof. Background technique [0002] With the rapid development of the economy and the continuous improvement of people's living standards, people's demand for energy is increasing day by day, especially the energy consumption dominated by fossil energy such as coal, oil and natural gas has risen sharply. Fossil energy is not only non-renewable, but also burning will cause serious environmental pollution and threaten the sustainable development of human society. Therefore, vigorously developing clean and renewable energy has become the energy strategy of countries all over the world. [0003] As a green, low-carbon, recyclable, renewable and clean energy, geothermal energy is basically not affected by geographical location, climate and seasons. It has the characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/30E21B33/13E21B7/06E21D8/00F24T10/15
CPCE21B43/00E21B43/305E21B33/13E21B7/06E21D8/00F24T10/15Y02E10/10F24T10/10
Inventor 宋刚刘春生胡汉月韩泽龙刘聃侯岳何楠陈剑垚陈晓林牛庆磊崔淑英田英英赵明李小洋
Owner EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI