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Equipment and method for enhancing stratum heat storage and supply efficiency in geothermal energy extraction system

An extraction system and geothermal energy technology, applied in the field of strengthening the heat supply efficiency of formation thermal storage, can solve the problems of reduced heat exchange efficiency, low heat exchange intensity, slow natural convection flow rate of geothermal water, etc. The effect of taking heat power

Active Publication Date: 2022-03-01
HEBEI HUATONG WIRES & CABLES GRP CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The natural convection flow rate of geothermal water in the pores of the heat storage formation is slow, resulting in low heat exchange intensity between the geothermal water and the heat extraction pipe string, and the temperature of the geothermal water in the vicinity of the heat extraction pipe string drops, while the geothermal water farther away is too late Replenish
The advantage of fully enclosed geothermal energy extraction technology is that the heat extraction medium does not come into contact with the heat storage formation. However, since the heat storage fluid can only exchange heat with the medium in the heat extraction pipe through natural convection in the pores of the formation, the heat exchange efficiency is greatly reduced, making the whole The heat extraction power of closed geothermal energy extraction technology is much lower than that of large displacement water extraction heat extraction mode and enhanced geothermal mode

Method used

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  • Equipment and method for enhancing stratum heat storage and supply efficiency in geothermal energy extraction system
  • Equipment and method for enhancing stratum heat storage and supply efficiency in geothermal energy extraction system
  • Equipment and method for enhancing stratum heat storage and supply efficiency in geothermal energy extraction system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment one, with reference to the attached figure 1 , the present invention is used in the concrete implementation mode of single vertical well coaxial tube closed heat exchanger:

[0033] A heat pipe 24 is arranged inside the heat pipe column 15 and the heat pipe section 15-1, and the heat pipe column 15, the heat pipe section 15-1 and the heat pipe 24 constitute a sleeve structure with a closed end of the outer cylinder, and the heat medium 14 is taken from the heat pipe 24. Enter the end of the heat extraction section 15-1, and return through the heat extraction pipe column 15 and the annular space between the heat extraction section 15-1 and the heat extraction pipe 24, forming a fully enclosed system for circulating heat extraction;

[0034] 1) After the completion of the main well of the geothermal well, the sidetracking branch well 7 is opened above the heat extraction formation 10, and the target layer of the branch well 7 is located in the same heat extract...

Embodiment 2

[0042] Embodiment two, referring to the attached figure 2 , the invention is used for a single horizontal well coaxial tube closed heat exchanger.

[0043] After the heat extraction main shaft reaches the heat extraction formation 10 vertically with the ground, it starts to bend into a horizontally arranged heat extraction main shaft, and the lowered heat extraction pipe string 15 is bent into the same shape as the overall shape of the heat extraction main shaft. All the other structures are the same as in Embodiment 1.

Embodiment 3

[0044] Embodiment three, with reference to the attached image 3 . The invention is used for a U-shaped butt joint well closed heat exchanger.

[0045] Two heat extraction main wells perpendicular to the ground 1 are connected at the bottom after entering the heat extraction formation 10, and the overall structure is U-shaped; the two heat extraction main wells are respectively lowered into the heat extraction pipe string 15 perpendicular to the ground, and the two heat extraction pipe strings The bottom of 15 is communicated with the heat-taking channel 25 arranged horizontally, and a heat-taking annular space 11-1 is formed around the heat-taking channel 25; , the heat extraction medium 14 enters the heat extraction channel 25 of the heat extraction formation 10 through a heat extraction column for heat exchange, and then returns to the ground through another heat extraction column, forming a fully enclosed system for circulating heat extraction.

[0046] The branch well 7...

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Abstract

The invention relates to equipment and a method for enhancing stratum heat storage and supply efficiency in a geothermal energy extraction system, and belongs to the field of new energy. According to the technical scheme, a branch well (7) communicated with a main well of the geothermal well is arranged above a heat removal stratum (10) of the main well of the geothermal well, and a target layer at the terminal point of the branch well and a heat removal annulus (11-1) of the main well of the geothermal well are located on the same heat removal stratum; an annular upper packer (12) and an annular lower packer (20) are arranged between a well completion casing pipe II (22) of the geothermal well main well and a heat taking pipe column (15), and the upper packer and the lower packer are located above and below the joint (4) of the geothermal well main well and the branch well respectively so as to pack a geothermal well shaft annulus (11) between the heat taking pipe column and the well completion casing pipe II. And a circulating pump (8) is arranged in the heat removal annulus below the lower packer. According to the method, underground water is not extracted, external fluid is not injected into the stratum, and the heat extraction power can be effectively improved under the condition that the requirement for environment-friendly development of geothermal energy is met.

Description

technical field [0001] The invention relates to a device and a method for enhancing the heat supply efficiency of stratum heat storage in a geothermal energy extraction system, belonging to the field of new energy. Background technique [0002] The reserves of geothermal energy in my country are very rich, and it is a clean and renewable green new energy. Vigorously developing geothermal energy technology and realizing the efficient and environmentally friendly development of geothermal energy are of great significance for adjusting my country's energy structure and achieving the goal of carbon neutrality. Significantly, at present, the main modes of exploiting geothermal energy include water extraction mode and enhanced geothermal development mode. Among them, the direct extraction of geothermal water has been restricted, banned or even shut down in China due to ground subsidence and the formation of a water level drop funnel. The problem of geological disasters. The estab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D15/00F24D19/00F24T10/17
CPCF24D15/00F24D19/00F24T10/17F24D2200/11Y02E10/10
Inventor 梁政刘强赵广慧蒋发光张书军刘艳平马怀兵
Owner HEBEI HUATONG WIRES & CABLES GRP CO LTD