CN113686034B - Operation method of medium-low temperature geothermal well utilization system for composite aquifer - Google Patents
Operation method of medium-low temperature geothermal well utilization system for composite aquifer Download PDFInfo
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- CN113686034B CN113686034B CN202111002097.6A CN202111002097A CN113686034B CN 113686034 B CN113686034 B CN 113686034B CN 202111002097 A CN202111002097 A CN 202111002097A CN 113686034 B CN113686034 B CN 113686034B
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- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 238000005065 mining Methods 0.000 claims description 13
- 239000011152 fibreglass Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 238000003973 irrigation Methods 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 abstract description 12
- 230000004888 barrier function Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000018109 developmental process Effects 0.000 description 6
- 238000005429 filling process Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The utility model provides a compound low temperature geothermal well utilization system for aquifer, includes compound aquifer, upper water barrier, immersible pump, exploitation well, geothermal water pipeline, plate heat exchanger, ground technology portion, recharging well, compound aquifer upside is connected upper water barrier, exploitation well and recharging well pass upper water barrier and insert compound aquifer, exploitation well and recharging well set up relatively, geothermal water pipeline middle part sets up plate heat exchanger, ground technology portion, plate heat exchanger sets up and is being close to exploitation well side, geothermal water pipeline left end sets up the immersible pump, the immersible pump inserts in the exploitation well, geothermal water pipeline right-hand member inserts in the recharging well; the composite aquifer comprises a lower aquifer, a lower water-resisting layer and an upper aquifer, wherein the upper aquifer, the lower water-resisting layer and the lower aquifer are sequentially arranged at the lower side of the upper water-resisting layer.
Description
Technical Field
The invention relates to the field of geothermal energy, in particular to an operation method of a medium-low temperature geothermal well utilization system for a composite aquifer.
Background
The geothermal energy is natural thermal energy which is stored in the earth, has the advantages of cleanness, high efficiency, stability, safety and the like, plays a unique role in energy conservation, emission reduction, haze treatment, energy structure adjustment and the like, and particularly becomes a main development direction in the future in the building energy supply field.
At present, the problems of low recharging efficiency of different degrees exist in a medium-deep water heating type geothermal system, a water source heat pump system and the like. Because geothermal recharging is a powerful measure for realizing sustainable development of geothermal resources, the geothermal recharging has been widely applied to countries around the world, and has important significance in the aspects of protecting geothermal resources, reducing resource waste, prolonging the service life of production wells, reducing environmental pollution and the like. It is necessary to try to improve recharging efficiency of geothermal water resources.
Disclosure of Invention
The invention provides a medium-low temperature geothermal well utilization system for a composite aquifer, which aims at the defects in the prior art and improves the recharging efficiency of geothermal water resources.
The invention aims at realizing the following technical scheme:
The utility model provides a compound aquifer is with well low temperature geothermal well utilization system, includes compound aquifer, goes up water barrier, immersible pump, exploitation well, geothermal water pipeline, plate heat exchanger, ground technology portion, recharging well, compound aquifer upside is connected and is gone up the water barrier, exploitation well and recharging well pass and go up the water barrier and insert compound aquifer, exploitation well and recharging well set up relatively, geothermal water pipeline middle part sets up plate heat exchanger, ground technology portion, plate heat exchanger sets up and is being close to exploitation well side, geothermal water pipeline left end sets up the immersible pump, the immersible pump inserts in the exploitation well, geothermal water pipeline right-hand member inserts in the recharging well.
The composite aquifer comprises a lower aquifer, a lower water-resisting layer and an upper aquifer, wherein the upper aquifer, the lower water-resisting layer and the lower aquifer are sequentially arranged at the lower side of the upper water-resisting layer.
The geothermal water pipeline is made of glass fiber reinforced plastic, the plate heat exchanger is made of titanium plates, and the ground process part is selectively combined according to actual conditions and can comprise a cyclone sand remover, a coarse filter, a precise filter, an exhaust tank and the like.
Advantageous effects
The exploitation well uses the lower water layer of the composite aquifer, and the well forming process can be selected from a one-open large-caliber gravel filling process, a two-open filter well forming process, a two-open perforation well forming process and the like. The submersible pump is selected after accurate hydraulic calculation. The geothermal water pipeline is made of glass fiber reinforced plastic, and proper pressure level can be selected according to actual conditions. The plate heat exchanger is made of titanium plates. The ground process part of the invention can be selected and combined according to actual conditions, and can comprise a cyclone sand remover, a coarse filter, a precise filter, an exhaust tank and the like. The recharging well utilizes all water layers of the composite water-bearing layer, and the well forming process can be selected from a one-open large-caliber gravel filling process, a two-open filter well forming process, a two-open perforation well forming process and the like.
The invention adopts the water layers at different positions of the composite aquifer, and the water layers are not polluted because the water layers belong to the same aquifer, and the invention belongs to the same-layer recharging in the hydrologic sense.
The well-forming process of the exploitation well and the recharging well can be mature processes such as a one-open large-caliber gravel-filling process, a two-open filter well-forming process, a two-open perforation well-forming process and the like, and has high selectivity.
The exploitation well only uses the lower water layer of the composite water-bearing layer, the water quantity is reduced, but the water temperature is increased, and the use effect is not affected; the recharging well utilizes all water layers of the composite water-bearing layer, increases the length of the water-bearing layer section, improves the utilization area of the reservoir, obviously increases the recharging quantity, and ensures a one-mining one-irrigation development and utilization mode. Particularly in a composite aquifer area with high ground temperature gradient, a development and utilization mode of three-mining two-mining four-mining three-mining can be designed properly.
The invention adopts glass fiber reinforced plastic materials for the pipelines, the valves and the like, has high strength, strong impact resistance, good temperature resistance and strong aging resistance, can select resin types according to different corrosion environment types, and has strong corrosion resistance designability.
The ground process part of the invention selectively combines the cyclone sand remover, the coarse filter, the precise filter and the exhaust tank according to actual conditions, thereby effectively solving the problem of blockage.
Taking a geothermal well as an example, the original exploitation well utilizes all the composite aquifer, the water quantity is 100 m/h, the available temperature is 5 ℃, 581.5kw of heat can be provided, when the exploitation well is changed to utilize the water layer at the lower part of the composite aquifer, the water quantity is reduced to 70 m/h, but the water temperature rises, the available temperature reaches 7 ℃, 569.87kw of heat can be provided, and the use effect is not affected.
When recharging, the exploiting well utilizes the lower water-bearing layer-part of the composite water-bearing layer, the recharging well utilizes the lower water-bearing layer-part and the upper water-bearing layer-part of the composite water-bearing layer, geothermal water is extracted by the submerged pump in the exploiting well, enters the plate heat exchanger through the geothermal water pipeline to complete heat exchange, then enters the ground process part to be treated, and then enters the recharging well to complete recharging.
The foregoing detailed description of a mid-low temperature geothermal well utilization system for a composite aquifer with reference to the embodiments is illustrative and not limiting, and therefore, should fall within the scope of the present invention without departing from the general inventive concept.
Drawings
FIG. 1 is a schematic diagram of a system for utilizing a geothermal well at medium and low temperatures for a composite aquifer according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples:
The utility model provides a well utilization system of low temperature geothermal well for compound aquifer, includes compound aquifer, upper water barrier 2, immersible pump 3, exploitation well 4, geothermal water pipeline 5, plate heat exchanger 6, ground technology portion 7, recharging well 8, compound aquifer upside is connected upper water barrier 2, exploitation well 4 and recharging well 8 pass upper water barrier 2 and insert compound aquifer, exploitation well 4 and recharging well 8 set up relatively, geothermal water pipeline 5 middle part sets up plate heat exchanger 6, ground technology portion 7, plate heat exchanger 6 sets up and is being close to exploitation well 4 side, geothermal water pipeline 5 left end sets up immersible pump 3, immersible pump 3 inserts in exploitation well 4, geothermal water pipeline 5 right-hand member inserts in recharging well 8.
The composite aquifer comprises a lower aquifer 1-1, a lower water-resisting layer 1-2 and an upper aquifer 1-3, wherein the upper aquifer 1-3, the lower water-resisting layer 1-2 and the lower aquifer 1-1 are sequentially arranged at the lower side of the upper water-resisting layer 2.
The geothermal water pipeline 5 is made of glass fiber reinforced plastic, the plate heat exchanger 6 is made of titanium plates, and the ground process part 7 is selectively combined according to actual conditions and can comprise a cyclone sand remover, a coarse filter, a precise filter, an exhaust tank and the like.
The exploitation well 4 utilizes the lower water layer of the composite aquifer, and the well forming process can be selected from a one-open large-caliber gravel filling process, a two-open filter well forming process, a two-open perforation well forming process and the like. The submersible pump 3 is selected after accurate hydraulic calculation. The geothermal water pipeline 5 is made of glass fiber reinforced plastic, and proper pressure level can be selected according to actual conditions. The plate heat exchanger 6 is made of titanium plates. The ground process part 7 of the invention can be selectively combined according to actual conditions and can comprise a cyclone sand remover, a coarse filter, a precise filter, an exhaust tank and the like. The recharging well 8 utilizes all water layers of the composite water-bearing layer, and the well forming process can be selected from a one-open large-caliber gravel filling process, a two-open filter well forming process, a two-open perforation well forming process and the like.
The exploitation well 4 and the recharging well 8 of the invention utilize water layers at different positions of the composite aquifer, and the water layers are not polluted because the water layers belong to the same aquifer, and belong to the same-layer recharging in the hydrologic sense.
The well forming process of the exploitation well 4 and the recharging well 8 can be mature processes such as a one-open large-caliber gravel filling process, a two-open filter well forming process, a two-open perforation well forming process and the like, and has high selectivity.
The exploitation well 4 only uses the lower water layer of the composite water-bearing layer, the water quantity is reduced, but the water temperature is increased, and the use effect is not affected; the recharging well 8 utilizes all water layers of the composite water-bearing layer, increases the length of the water-bearing layer section, improves the utilization area of the reservoir, obviously increases the recharging amount, and ensures a one-mining one-irrigation development and utilization mode. Particularly in a composite aquifer area with high ground temperature gradient, a development and utilization mode of three-mining two-mining four-mining three-mining can be designed properly.
The invention adopts glass fiber reinforced plastic materials for the pipelines, the valves and the like, has high strength, strong impact resistance, good temperature resistance and strong aging resistance, can select resin types according to different corrosion environment types, and has strong corrosion resistance designability.
The ground process part 7 of the invention selectively combines the cyclone sand remover, the coarse filter, the precise filter and the exhaust tank according to actual conditions, thereby effectively solving the problem of blockage.
Taking a geothermal well as an example, the original exploitation well utilizes all the composite aquifer, the water quantity is 100 m/h, the available temperature is 5 ℃, 581.5kw of heat can be provided, when the exploitation well is changed to utilize the water layer at the lower part of the composite aquifer, the water quantity is reduced to 70 m/h, but the water temperature rises, the available temperature reaches 7 ℃, 569.87kw of heat can be provided, and the use effect is not affected.
During recharging, the exploitation well 4 utilizes the lower aquifer 1-1 part of the composite aquifer, the recharging well 8 utilizes the lower aquifer 1-1 part and the upper aquifer 1-3 part of the composite aquifer, geothermal water is extracted by the submerged pump 3 in the exploitation well 4, enters the plate heat exchanger 6 through the geothermal water pipeline 5 to complete heat exchange, and then enters the ground process part 7 to be treated and then enters the recharging well 8 to complete recharging.
The foregoing detailed description of a mid-low temperature geothermal well utilization system for a composite aquifer with reference to the embodiments is illustrative and not limiting, and therefore, should fall within the scope of the present invention without departing from the general inventive concept.
The operation method of the medium-low temperature geothermal well utilization system for the composite aquifer comprises the following steps:
1. during recharging, the exploitation well 4 utilizes the lower aquifer 1-1 part of the composite aquifer, and the recharging well 8 utilizes the lower aquifer 1-1 part and the upper aquifer 1-3 part of the composite aquifer;
2. The geothermal water is extracted by a submersible pump 3 in a exploitation well 4, and enters a plate heat exchanger 6 through a geothermal water pipeline 5 to complete heat exchange;
3. And the water after heat exchange enters the ground process part 7 for treatment and then enters the recharging well 8, so that recharging is completed.
Claims (1)
1. The operation method of the medium-low temperature geothermal well utilization system for the composite aquifer is characterized by comprising the following steps that the medium-low temperature geothermal well utilization system for the composite aquifer comprises a composite aquifer, an upper water-resisting layer, a submersible pump, a exploitation well, a geothermal water pipeline, a plate heat exchanger, a ground process part and a recharging well, wherein the upper side of the composite aquifer is connected with the upper water-resisting layer, the exploitation well and the recharging well penetrate through the upper water-resisting layer and are inserted into the composite aquifer, the exploitation well and the recharging well are arranged oppositely, the plate heat exchanger and the ground process part are arranged in the middle of the geothermal water pipeline, the plate heat exchanger is arranged on the side close to the exploitation well, the submersible pump is arranged at the left end of the geothermal water pipeline, the submersible pump is inserted into the exploitation well, and the right end of the geothermal water pipeline is inserted into the recharging well; the composite aquifer comprises a lower aquifer, a lower water-resisting layer and an upper aquifer, wherein the upper aquifer, the lower water-resisting layer and the lower aquifer are sequentially arranged at the lower side of the upper water-resisting layer; the geothermal water pipeline is made of glass fiber reinforced plastic, the plate heat exchanger is made of titanium plates, and the ground process part comprises a cyclone sand remover, a coarse filter, a precise filter and an exhaust tank; the exploitation well only uses the lower water layer of the composite water-bearing layer, the water quantity is reduced, but the water temperature is increased, so that the use effect is not affected; the recharging well utilizes all water layers of the composite aquifer, increases the length of an aquifer section, increases the utilization area of a reservoir, obviously increases recharging quantity, ensures a one-mining one-irrigation development and utilization mode, realizes a three-mining two-irrigation and four-mining three-irrigation development and utilization mode in a composite aquifer area with high ground temperature gradient, reduces the water quantity to 70 m/h when the exploitation well is changed to utilize the water layer at the lower part of the composite aquifer, but increases the water temperature, and the available temperature reaches 7 ℃, so that the water temperature can provide 569.87kw of heat; the first step, the exploiting well uses the lower water-bearing layer part of the composite water-bearing layer during recharging, and the recharging well uses the lower water-bearing layer part and the upper water-bearing layer part of the composite water-bearing layer;
secondly, geothermal water is extracted by a submerged pump in a exploitation well and enters a plate heat exchanger through a geothermal water pipeline to complete heat exchange;
And thirdly, the water subjected to heat exchange enters a ground process part for treatment and then enters a recharging well to finish recharging.
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| CN202111002097.6A CN113686034B (en) | 2021-08-30 | 2021-08-30 | Operation method of medium-low temperature geothermal well utilization system for composite aquifer |
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| CN202111002097.6A CN113686034B (en) | 2021-08-30 | 2021-08-30 | Operation method of medium-low temperature geothermal well utilization system for composite aquifer |
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| CN112502922A (en) * | 2020-12-28 | 2021-03-16 | 山东地子新能源科技有限公司 | Underground energy development and recycling system |
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| CN103104219B (en) * | 2011-11-14 | 2015-08-19 | 国惠环保新能源有限公司 | Utilize and draw back with layer equivalent original place the method that well group draws underground heat energy |
| US9869167B2 (en) * | 2012-11-12 | 2018-01-16 | Terracoh Inc. | Carbon dioxide-based geothermal energy generation systems and methods related thereto |
| CN112197448B (en) * | 2020-09-07 | 2022-03-11 | 河北省地矿局国土资源勘查中心 | Geothermal development system |
| CN113153223B (en) * | 2021-03-23 | 2022-03-22 | 河北省地矿局第三水文工程地质大队 | Sandstone-type water outlet geothermal well and recharge well construction method |
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| CN112502922A (en) * | 2020-12-28 | 2021-03-16 | 山东地子新能源科技有限公司 | Underground energy development and recycling system |
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