CN111365752A - Solar energy combined double-well closed type enhanced geothermal heating system - Google Patents

Solar energy combined double-well closed type enhanced geothermal heating system Download PDF

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CN111365752A
CN111365752A CN202010120086.7A CN202010120086A CN111365752A CN 111365752 A CN111365752 A CN 111365752A CN 202010120086 A CN202010120086 A CN 202010120086A CN 111365752 A CN111365752 A CN 111365752A
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well
heat
solar
heating system
composite
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CN111365752B (en
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卜宪标
蒋坤卿
王令宝
李华山
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Guangzhou Institute of Energy Conversion of CAS
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Guangzhou Institute of Energy Conversion of CAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
    • F24D11/003—Central heating systems using heat accumulated in storage masses water heating system combined with solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T2010/50—Component parts, details or accessories
    • F24T2010/56—Control arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/40—Geothermal heat-pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Central Heating Systems (AREA)

Abstract

The invention discloses a solar energy combined double-well closed enhanced geothermal heating system which comprises a first heating system, a second heating system and a heat storage system, wherein the first heating system comprises a circulating pump, a heat pump and a double-well closed enhanced geothermal system; the second heat supply system comprises a solar heat collector, a heat storage water tank and a hot water pump, an outlet of the solar heat collector is sequentially connected with the heat storage water tank, the hot water pump and the target building, and an inlet of the solar heat collector is connected with the target building. The solar energy and the double-well closed enhanced geothermal system are combined to supply heat in the heating season, the instability of the solar energy is solved by utilizing the adjusting capability of the geothermal system, and the heat of the solar energy is stored in the geothermal system in the non-heating season.

Description

Solar energy combined double-well closed type enhanced geothermal heating system
Technical Field
The invention relates to the technical field of clean energy heating, in particular to a solar energy combined double-well closed type enhanced geothermal heating system.
Background
For a region lacking in hydrothermal geothermal resources, if geothermal energy needs to be exploited in a large scale, two ways are usually adopted, one is a traditional Enhanced Geothermal System (EGS) and the other is a closed deep well heat exchanger (DBHE). the EGS creates a high-permeability fracture in low-permeability rock through a hydraulic fracturing method to realize convective heat exchange between fluid and rock, and the heat exchange way can greatly improve the heat exchange of water and rock, and is a promising way for exploitation of dry-hot rock thermal energy.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a solar energy combined double-well closed type enhanced geothermal heating system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a solar energy combined double-well closed enhanced geothermal heating system comprises a first heating system, a second heating system and a heat storage system, wherein the first heating system comprises a circulating pump, a heat pump and a double-well closed enhanced geothermal system, the double-well closed enhanced geothermal system comprises an injection well, a production well and a horizontal well communicated with the injection well and the production well, well pipes are coated on the outer sides of the injection well, the production well and the horizontal well, cement rings are coated on the outer sides of partial well pipes of the horizontal well, the injection well is sequentially connected with the circulating pump and a first inlet of the heat pump, the production well is connected with a first outlet of the heat pump, and a second inlet and a second outlet of the heat pump are connected with a target building; the second heat supply system comprises a solar heat collector, a heat storage water tank and a hot water pump, an outlet of the solar heat collector is sequentially connected with the heat storage water tank, the hot water pump and a target building, and an inlet of the solar heat collector is connected with the target building.
Further, the heat storage system comprises a hot water pump, a solar heat collector and a heat pump, wherein the outlet of the hot water pump is connected with a production well, and the inlet of the solar heat collector is connected with an injection well; a first injection valve is arranged between the injection well and the circulating pump, and a first production valve is arranged between the production well and the first outlet; a second injection valve is arranged between the inlet of the solar heat collector and the target building, and a second extraction valve is arranged between the hot water pump and the target building; and a heat storage injection valve is arranged between the hot water pump and the extraction well, and a heat storage extraction valve is arranged between the solar heat collector and the injection well.
Further, the temperature of the hot water supplied to the target building by the first heating system and the second heating system is 45 ℃.
Further, the horizontal well is arranged in a leakage layer and a water-containing layer.
Furthermore, the cement sheath is made of a high-thermal-conductivity material and cement in a composite mode.
Further, the well pipe comprises a composite well pipe and a common oil pipe, wherein the composite well pipe is made by compounding high-heat-conductivity materials and the oil pipe, the composite well pipe is arranged in a lost circulation layer and a water-bearing layer part well section, and the common oil pipe is adopted in the rest part.
Furthermore, the composite drilling fluid is prepared by compounding high-heat-conductivity materials and mud during drilling.
Furthermore, when the drilling meets the leakage layer, the density, viscosity and back pressure of the composite drilling fluid are adjusted, so that the composite drilling fluid leaks into the leakage layer more, and the heat conducting performance of the leakage layer is improved.
Furthermore, when the water-bearing stratum is drilled, the density, viscosity and back pressure of the composite drilling fluid are adjusted, so that the composite drilling fluid is leaked into the water-bearing stratum more, and the heat-conducting property of the water-bearing stratum is improved.
Further, the high-thermal-conductivity material is made of a graphene material.
Compared with the prior art, the invention has the following advantages:
the invention adopts the combination of solar energy and the double-well closed enhanced geothermal system, the combination of the solar energy and the double-well closed enhanced geothermal system is used for heating in the heating season, the instability of the solar energy is solved by utilizing the wide load adjusting capability of the double-well closed enhanced geothermal system, and the heat of the solar energy is stored into the double-well closed enhanced geothermal system in the non-heating season. The double-well closed enhanced geothermal system adopts graphene to be respectively compounded with drilling mud, well-cementing cement and a well pipe to form a composite material with high heat conductivity so as to strengthen the heat conductivity of a stratum, the well-cementing cement and the well pipe. As the water-free leakage layer or aquifer is often drilled in the drilling process, horizontal wells are drilled at the layers, and meanwhile, the composite drilling mud with high heat conductivity is deliberately leaked into the stratum so as to improve the heat conductivity of the stratum.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a solar combined twin-well closed type enhanced geothermal heating system;
FIG. 2 is a schematic diagram of the overall structure of a twin-well closed enhanced geothermal system;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;
description of reference numerals: 1. a circulation pump; 2. a heat pump; 21. a first inlet; 22. a first outlet; 23. a second inlet; 24. a second outlet; 3. a twin-well closed enhanced geothermal system; 31. an injection well; 32. a production well; 33. a leakage layer; 34. horizontal wells; 35. a cement sheath; 36. an aqueous layer; 37. a dense layer; 4. a target building; 5. a solar heat collector; 6. a heat storage water tank; 7. a hot water pump; 81. a first injection valve; 82. a first production valve; 83. a second injection valve; 84. a second production valve; 91. a heat storage injection valve; 92. a heat storage extraction valve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
As shown in fig. 1, a solar energy combined double-well closed enhanced geothermal heating system comprises a first heating system, a second heating system and a heat storage system, wherein the first heating system comprises a circulating pump 1, a heat pump 2 and a double-well closed enhanced geothermal system 3, the double-well closed enhanced geothermal system 3 comprises an injection well 31, a production well 32 and a horizontal well 34 communicated with the injection well 31 and the production well 32, the outsides of the injection well 31, the production well 32 and the horizontal well 34 are respectively coated with a well pipe, the outside of part of the well pipe of the horizontal well 34 is coated with a cement ring 35, the injection well 31 is sequentially connected with the circulating pump 1 and a first inlet 21 of the heat pump 2, the production well 32 is connected with a first outlet 22 of the heat pump 2, and a second inlet 23 and a second outlet 24 of the heat pump 2 are both connected with a target; the second heat supply system comprises a solar heat collector 5, a heat storage water tank 6 and a hot water pump 7, an outlet of the solar heat collector 5 is sequentially connected with the heat storage water tank 6, the hot water pump 7 and the target building 4, and an inlet of the solar heat collector 5 is connected with the target building 4.
As shown in fig. 2 and 3, the twin-well closed enhanced geothermal system 3 comprises a dense layer 37, a lost circulation layer 33 and an aquifer 36 on the ground, and further comprises an injection well 31, a production well 32 and a horizontal well 34 communicating the injection well 31 and the production well 32, wherein the injection well 31, the production well 32 and the horizontal well 34 are coated with well pipes on the outer sides, and a portion of the well pipes of the horizontal well 34 is coated with a cement ring 35 on the outer side. The horizontal well 34 is arranged in the thief zone 33 and the aquifer 36, and the cement sheath 35 is made of a material with high thermal conductivity and cement, for example, graphene is compounded with cement, so that the thermal conductivity of the thief zone 33 and the aquifer 36 is improved. Besides graphene, the high-thermal-conductivity material can also be made of carbon fiber and other high-thermal-conductivity materials.
Because the heat transfer effect of the loss formation 33 and the aquifer 36 is smaller than that of the compact layer 37, the well pipes are improved aiming at the loss formation 33 and the aquifer 36, the well pipes comprise a composite well pipe and a common oil pipe, the composite well pipe is made by compositing graphene and the oil pipe, the composite well pipe is arranged on the well sections of the loss formation 33 and the aquifer 36 to enhance the heat exchange effect, and the common oil pipe is used in the rest part.
In order to further improve the heat conductivity of the thief zone 33 and the aquifer 36, the composite drilling fluid prepared by compounding graphene and mud is adopted during drilling, and when the thief zone 33 and the aquifer 36 are encountered during drilling, the composite drilling fluid is deliberately leaked into the thief zone 33 and the aquifer 36 more by adjusting the density, viscosity and back pressure of the composite drilling fluid, so as to improve the heat conductivity of the thief zone 33 and the aquifer 36.
Because the heat-taking power of the double-well closed enhanced geothermal system 3 is further improved after being optimized, the heat loss of the compact layer 37 is increased, and if heat is taken for a long time, the heat-taking performance of the system can be attenuated, and the problem is well solved by a heat-storage system, as shown in fig. 1, the heat-storage system comprises a hot water pump 7 with an outlet connected with a production well 32 and a solar heat collector 5 with an inlet connected with an injection well 31; a first injection valve 81 is arranged between the injection well 31 and the circulating pump 1, and a first production valve 82 is arranged between the production well 32 and the first outlet 22; a second injection valve 83 is arranged between the inlet of the solar heat collector 5 and the target building 4, and a second extraction valve 84 is arranged between the hot water pump 77 and the target building 4; a heat storage injection valve 91 is arranged between the hot water pump 7 and the extraction well 32, and a heat storage extraction valve 92 is arranged between the solar heat collector 5 and the injection well 31. When heat storage is needed, the first and second extraction valves and the first and second injection valves are closed, and the heat storage injection valve 91 and the heat storage extraction valve 92 are opened to store heat for the deep well heat exchanger.
Specifically, the implementation process of the construction of the twin-well closed type enhanced geothermal system 3 is as follows:
firstly, preparing the composite drilling fluid with high thermal conductivity. The mud drilling fluid with the mass fraction of 80% is compounded with the graphene with the mass fraction of 20% to prepare the composite drilling fluid with high thermal conductivity.
And secondly, drilling an injection well and a production well. The well opening section drill bit is 311.15mm, the sleeve is 244.275mm, the depth is 200 m, the well opening section drill bit is mainly used for protecting shallow underground water, and a common well pipe and common well cementing cement are adopted. The injection well and the production well are 1000m apart.
And thirdly, drilling a well for two times, wherein the drill bit is 215.9mm, the sleeve is 177.8mm, and the target depth is 3000 meters. During the drilling process, the positions and the thicknesses of an anhydrous leakage layer and an aquifer are ascertained;
and fourthly, drilling a horizontal well in the thief zone and the aquifer, wherein the drill bit is 171.45mm and the well pipe is 127 mm. By adjusting the density, viscosity and back pressure of the composite drilling fluid, the drilling fluid is intentionally leaked into the stratum, and the heat-conducting property of the stratum is improved.
And fifthly, lowering the well pipe. For horizontal well pipes of a leakage layer and a water-bearing layer, an oil pipe and graphene are compounded to form a composite well pipe with high heat conductivity. The well pipes of 1000m in the injection well and the extraction well are made of high-performance composite materials, and the upper well section is made of common oil pipes.
And sixthly, compounding ordinary well cementation cement and graphene to prepare the composite well cementation cement with high heat conductivity. The mass ratio of the common cement to the graphene is 8: 2.
and seventhly, cementing the well. And the horizontal well is fixed by adopting composite well cementation cement. The 100m sections of the lower parts of the injection well and the extraction well adopt high-performance composite well cementing cement, and the upper sections adopt ordinary cement for well cementing.
When the solar heat-storage system is used specifically, in seasons needing heating, the first and second extraction valves and the first and second injection valves are opened, the heat-storage injection valve 91 and the heat-storage extraction valve 92 are closed, the hot water pump 7, the heat pump 2 and the circulating pump 1 are started, and solar energy and geothermal energy are used for heating the target building 4 at the same time; in rainy days or at night, when solar energy is unstable and discontinuous, the heat load requirement of the building is met by changing the injection temperature and flow of geothermal water and adjusting the output heat power of the heat pump 2; when the heat load of the building changes with the changes of the temperature of the weather, the injection temperature and the flow of the geothermal water are mainly changed, and the heat load requirement of the heat pump 2 is adjusted.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (9)

1. The utility model provides a solar energy closes twin-well closed enhancement mode geothermal heating system which characterized in that: comprises a first heat supply system, a second heat supply system and a heat storage system, wherein the first heat supply system comprises a circulating pump (1), a heat pump (2) and a double-well closed enhanced geothermal system (3), the double-well closed enhanced geothermal system (3) comprises an injection well (31), a production well (32) and a horizontal well (34) communicated with the injection well (31) and the production well (32), the outsides of the injection well (31), the extraction well (32) and the horizontal well (34) are all coated with well pipes, the exterior of a part of well pipes of the horizontal well (34) is coated with a cement sheath (35), the injection well (31) is sequentially connected with a circulating pump (1) and a first inlet (21) of a heat pump (2), the production well (32) is connected with a first outlet (22) of the heat pump (2), the second inlet (23) and the second outlet (24) of the heat pump (2) are both connected with the target building (4); the second heating system comprises a solar heat collector (5), a heat storage water tank (6) and a hot water pump (7), an outlet of the solar heat collector (5) is sequentially connected with the heat storage water tank (6), the hot water pump (7) and a target building (4), and an inlet of the solar heat collector (5) is connected with the target building (4).
2. The solar combined twin-well closed geothermal heating system of claim 1, wherein: the heat storage system comprises a hot water pump (7) with an outlet connected with a production well (32), and a solar heat collector (5) with an inlet connected with an injection well (31); a first injection valve (81) is arranged between the injection well (31) and the circulating pump (1), and a first production valve (82) is arranged between the production well (32) and the first outlet (22); a second injection valve (83) is arranged between the inlet of the solar heat collector (5) and the target building (4), and a second extraction valve (84) is arranged between the hot water pump (7) and the target building (4); a heat storage injection valve (91) is arranged between the hot water pump (7) and the extraction well (32), and a heat storage extraction valve (92) is arranged between the solar heat collector (5) and the injection well (31).
3. The solar combined twin-well closed geothermal heating system of claim 1, wherein: the horizontal well (34) is disposed within a thief zone (33) and an aquifer (36).
4. The solar combined twin-well closed geothermal heating system of claim 1, wherein: the cement sheath (35) is made of a high-heat-conductivity material and cement in a composite mode.
5. The solar combined twin-well closed geothermal heating system of claim 1, wherein: the well pipe comprises a composite well pipe and a common oil pipe, wherein the composite well pipe is made by compounding high-heat-conductivity materials and the oil pipe, the composite well pipe is arranged at a well section of a leakage layer (33) and a water-bearing layer (36), and the common oil pipe is adopted in the rest part.
6. The solar combined twin-well closed geothermal heating system of claim 1, wherein: the composite drilling fluid is prepared by compounding high-heat-conductivity materials and mud during drilling.
7. The solar combined twin-well closed geothermal heating system of claim 6, wherein: when the drilling meets the leakage layer (33), the composite drilling fluid is leaked into the leakage layer (33) more by adjusting the density, viscosity and back pressure of the composite drilling fluid, so that the heat conducting property of the leakage layer (33) is improved.
8. The solar combined twin-well closed geothermal heating system of claim 6, wherein: when drilling the aquifer (36), the density, viscosity and back pressure of the composite drilling fluid are adjusted to ensure that the composite drilling fluid is leaked into the aquifer (36) more, so as to improve the heat-conducting property of the aquifer (36).
9. A solar energy combination twin-well closed geothermal heating system according to any one of claims 4 to 6, characterised in that: the high-thermal-conductivity material is a graphene material.
CN202010120086.7A 2020-02-26 2020-02-26 Solar energy combined double-well closed type enhanced geothermal heating system Active CN111365752B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN114427755A (en) * 2022-01-17 2022-05-03 中国科学院广州能源研究所 Efficient heat taking system of U-shaped heat exchanger for karst heat storage

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CN1451930A (en) * 2002-04-12 2003-10-29 米砂瓦环境技术株式会社 Snow melting device using geothermal energy
CN201093653Y (en) * 2007-09-25 2008-07-30 天津凯能科技发展有限公司 Solar energy and heat pump cold and hot supplying apparatus for summer hot winter use
CN101701733A (en) * 2009-12-04 2010-05-05 天津大学 Solar energy-ground source heat pump-floor radiation heating combined heating system
US20180172318A1 (en) * 2016-12-16 2018-06-21 Woods Technologies, LLC Induced groundwater flow closed loop geothermal system
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