Heat exchange working medium recyclable type same-well thermal recovery method

A heat exchange working medium and heat recovery technology, which is applied in the field of heat recovery of heat exchange working medium in the same well, can solve the problems of changing groundwater distribution, low heat exchange efficiency, etc., to reduce usage, improve heat exchange effect, Stable and continuous effect of energy supply

Inactive Publication Date: 2021-03-19
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned problems, the present invention provides a recyclable heat exchange working medium heat recovery method in the same well, which solves the problems of long-term operation of the existing geothermal energy resource heat recovery system to change the original groundwater distribution and low heat exchange efficiency

Method used

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  • Heat exchange working medium recyclable type same-well thermal recovery method
  • Heat exchange working medium recyclable type same-well thermal recovery method
  • Heat exchange working medium recyclable type same-well thermal recovery method

Examples

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Embodiment 1

[0056] In this embodiment, the heat is extracted for heating of residents, so the heat exchange or power generation equipment 8 in the ground heat exchange and energy supply part is heat exchange equipment.

[0057] like figure 1 , figure 2 , image 3 As shown in the figure, a recyclable heat exchange medium heat recovery technology in the same well, the implementation system based on it includes the underground heat recovery part, that is, the single well system and the surface heat exchange and energy supply part. The underground heat recovery part includes 1 The wellbore 3 connected to the target geothermal reservoir 2, the sealing flange 6, the artificial fracture 4 selected and set according to the permeability of the reservoir and the proppant 5 filled in it, that is, if the hot dry rock type geothermal resources are dense For igneous rocks, it is necessary to form artificial fractures in the geothermal reservoir by hydraulic fracturing and other stimulating means. In...

Embodiment 2

[0061] In this embodiment, the heat is extracted for heating of residents.

[0062] On the basis of Example 1, this example illustrates the implementation process of realizing the heat recovery method in the same well with recyclable heat-exchanging fluid in two wells for residential heating. like Figure 4 As shown, two wells coordinate and alternately carry out the process of injection-steaming-recovery to ensure the stability and continuity of the total heat produced. The shafts 3 in the system are respectively the first shaft 31 and the second shaft 32, and the first shaft 31 and the second shaft 32 share a set of ground heat exchange and heating parts;

[0063] Assuming that the total amount of injection and the total amount of production of the two wellbores are equal in each injection-simmering-recovery cycle, the mass is recorded as M. The injection rate is v, the production rate is 1 / 2v, the injection time is t=M / v, the production time is 2t, and the brine time is t...

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Abstract

The invention belongs to the technical field of geothermal development, and particularly relates to a heat exchange working medium recyclable type same-well thermal recovery method. An implementationsystem comprises a shaft, a submersible pump, a booster pump, heat exchange equipment, a buffer storage tank and a wellhead sealing flange, the shaft penetrates through a cover layer and communicatesto a target thermal reservoir, the submersible pump is used for exploitation, the booster pump is used for injection, a reservoir permeability improvement link according to needs can be set, for instance, an artificial fracture and a proppant filled in the artificial fracture are set; and the implementation process comprises the steps that a certain amount of low-temperature heat exchange workingmedia are injected into the target thermal reservoir through the shaft which communicate to the target thermal reservoir, then soaking is conducted, the injected heat exchange working media are movedoutwards in a geothermal reservoir and conduct sufficient heat exchange with the reservoir, and then geothermal recovery is achieved by pumping back the injected heat exchange working media through the same shaft. The problems that an existing geothermal energy resource thermal recovery system operates for a long time to change original underground water distribution, and the heat exchange efficiency is low are solved.

Description

technical field [0001] The invention belongs to the technical field of geothermal development, and in particular relates to a recyclable heat-exchange working fluid heat recovery method in the same well. Background technique [0002] Geothermal energy is a green, low-carbon, sustainable and renewable energy. With its large reserves, wide distribution, stability and reliability, its development is increasingly valued and supported by countries all over the world. According to the occurrence state of geothermal energy, it can be divided into hydrothermal type, dry hot rock type and shallow geothermal energy geothermal resources. Different types of geothermal energy resources are developed in different ways. For geothermal reservoirs with good connectivity and permeability, the multi-well heat recovery-recharge mode is generally used for exploitation, while for geothermal reservoirs with poor connectivity and permeability, either An enhanced geothermal system is established by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24T10/20
CPCF24T10/20Y02E10/10
Inventor 雷宏武蔡雨娜白冰崔银祥
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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