CN113847744A - Geothermal exploitation and utilization method - Google Patents
Geothermal exploitation and utilization method Download PDFInfo
- Publication number
- CN113847744A CN113847744A CN202111167680.2A CN202111167680A CN113847744A CN 113847744 A CN113847744 A CN 113847744A CN 202111167680 A CN202111167680 A CN 202111167680A CN 113847744 A CN113847744 A CN 113847744A
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- Prior art keywords
- heat exchange
- exchange layer
- well
- water
- layer
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T50/00—Geothermal systems
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- 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
Abstract
A geothermal exploitation and utilization method comprises the following process steps: the novel well drilling construction has the advantages that pumping and recharging equipment are installed, the novel well drilling construction is in butt joint with heating equipment, water is pumped when the machine is started, recharging is conducted, and water pumping and recharging are conducted periodically and alternately. And the structure of the water taking well and the water returning well determines the radiation distance of the far end of the heat extraction pipe. Compared with the prior art, the invention has the advantages that the first pumping-back is periodically exchanged, so that the problem of backwater blockage is solved; all the water pumping wells and the water returning wells are arranged in a ground centralized manner, and underground heat collection and radiation are arranged, so that the heat collection area is large, the engineering occupied area is small, and the construction cost is low; each group of heat collecting perforated pipes are arranged in the geological heat layer in a three-dimensional mode, and the geothermal utilization rate is high.
Description
Technical Field
The invention relates to a geothermal exploitation and utilization method.
Background
Currently, there are two modes of geothermal mining in the prior art: the first mode is a pump-back mode, which, although it is said to be thermally efficient, has the following two disadvantages: the first is that it is big to occupy the ground area, and the construction cost is high, and the second is that the return water well floral tube has lasted easy jam. The second mode is the underground heat exchange of the U-shaped heat exchanger, and the defects of the mode are that the heat exchange area is small (caused by the reason of constructors) and the mode is not suitable for large heating projects. Therefore, the design of the geothermal exploitation and utilization method which occupies small ground area and is not easy to block a backwater perforated pipe is a technical problem to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a geothermal exploitation and utilization method which occupies small ground area and is not easy to block a backwater perforated pipe.
The technical scheme for solving the technical problem is as follows:
a geothermal exploitation and utilization method comprises the following process steps: the novel well drilling construction has the advantages that pumping and recharging equipment are installed, the novel well drilling construction is in butt joint with heating equipment, water is pumped when the machine is started, recharging is conducted, and water pumping and recharging are conducted periodically and alternately.
As a preferred scheme of the invention, the well drilling construction, firstly, carries on the geological exploration, namely carries on the depth, position, resource amount determination of the geothermal energy storage, secondly, determines the number and well diameter of the water intake well, the backwater well according to the geothermal energy consumption; thirdly, determining the minimum well spacing according to the well diameter and the well depth; fourthly, determining the number of water taking wells and water returning wells according to the minimum well spacing, determining the minimum ground floor area and the well hole layout mode, and fifthly, determining the structures of the water taking wells and the water returning wells, and determining the radiation distance of the far ends of the heat collecting pipes; and sixthly, completing the well drilling by using a directional drilling technology.
As a preferred scheme of the invention, the well layout mode is a rectangular layout or a circular layout, no matter the rectangular layout or the circular layout, the water taking well and the water returning well are distributed in pairs nearby, namely, the nearest water taking well and the nearest water returning well form a group, the water taking well comprises a deep well pump layer I, a light pipe layer I and a heat exchange layer I, the water returning well comprises a deep well pump layer II, a light pipe layer II and a heat exchange layer II, the heat exchange layer I and the heat exchange layer II are flower pipes, the heat exchange layer I and the heat exchange layer II enter the geological heat layer and then are turned by first bending and extend towards the direction far away from the water taking well and the water returning well, the distance between the heat exchange layer I and the heat exchange layer II is far greater than the distance between the water taking well and the water returning well when the wells are vertical, and the tails of the heat exchange layer I and the heat exchange layer II are intersected in a short distance by second turning.
As a preferable scheme of the invention, the heat exchange layer I and the heat exchange layer II are horizontally arranged up and down, the tail part of the heat exchange layer I and the tail part of the heat exchange layer II are bent downwards after the heat exchange layer I and the heat exchange layer II are bent for the second time, and the tail part of the heat exchange layer I and the tail part of the heat exchange layer II are bent upwards after the heat exchange layer I and the heat exchange layer II are bent for the second time.
As a preferable scheme of the invention, the heat exchange layer I and the heat exchange layer II are obliquely arranged up and down, the tail part of the heat exchange layer I and the tail part of the heat exchange layer II are bent downwards after the opposite position is changed to the upper part through the second bending, and the tail part of the heat exchange layer I and the tail part of the heat exchange layer II are bent upwards after the opposite position is changed to the lower part through the second bending, so that the tail parts of the heat exchange layer I and the heat exchange layer II are converged at a short distance.
As a preferable scheme of the invention, the heat exchange layer I and the heat exchange layer II are obliquely arranged from left to right, the tail part of the heat exchange layer I and the tail part of the heat exchange layer II are bent rightwards after the relative position of the heat exchange layer I and the heat exchange layer II is changed to the left through the second bending, and the tail part of the heat exchange layer I and the tail part of the heat exchange layer II are bent leftwards after the relative position of the heat exchange layer I and the tail part of the heat exchange layer II are changed to the right through the second bending, so that the tail parts of the heat exchange layer I and the heat exchange layer II are converged at a short distance.
As a preferable scheme of the invention, the tail parts of the heat exchange layer I and the heat exchange layer II are closely converged and then have a certain extension, and the extension sections are parallel to each other.
Compared with the prior art, the invention has the advantages that the first pumping-back is periodically exchanged, so that the problem of backwater blockage is solved; all the water pumping wells and the water returning wells are arranged in a ground centralized manner, and underground heat collection and radiation are arranged, so that the heat collection area is large, the engineering occupied area is small, and the construction cost is low; each group of heat collecting perforated pipes are arranged in the geological heat layer in a three-dimensional mode, and the geothermal utilization rate is high.
Drawings
FIG. 1 is a schematic diagram of a surface concentration arrangement, subsurface radiation arrangement (first embodiment) of the present invention;
FIG. 2 is a schematic diagram of a surface concentration arrangement, subsurface radiation arrangement (second embodiment) of the present invention;
FIG. 3 is a schematic view of a water pumping and returning well structure according to the present invention (first embodiment);
FIG. 4 is a schematic view of a water pumping and returning well structure according to the present invention (second embodiment);
fig. 5 is a schematic view of the structure of a water pumping and returning well according to the present invention (third embodiment-axial side-view method).
Detailed Description
As shown in the figure, the geothermal exploitation and utilization method comprises the following process steps: the novel well drilling construction has the advantages that pumping and recharging equipment are installed, the novel well drilling construction is in butt joint with heating equipment, water is pumped when the machine is started, recharging is conducted, and water pumping and recharging are conducted periodically and alternately.
The well drilling construction comprises the steps of firstly, carrying out geological exploration, namely determining the depth, the position and the resource amount of geothermal energy storage, and secondly, determining the number and the well diameter of a water taking well and a water returning well according to the geothermal energy consumption; thirdly, determining the minimum well spacing according to the well diameter and the well depth; fourthly, determining the number of water taking wells and water returning wells according to the minimum well spacing, determining the minimum ground floor area and the well hole layout mode, and fifthly, determining the structures of the water taking wells and the water returning wells, and determining the radiation distance of the far ends of the heat collecting pipes; and sixthly, completing the well drilling by using a directional drilling technology.
The well hole layout mode is a rectangular layout or a circular layout, and no matter the rectangular layout or the circular layout, the water taking wells and the water returning wells are distributed in pairs nearby, namely, the nearest one-eye water taking well A and one-eye water returning well B form a group, the water taking well A comprises a deep well pump layer IA 1, a light pipe layer IA 2 and a heat exchange layer IA 3, the water returning well B comprises a deep well pump layer IIB 1, a light pipe layer IIB 2 and a heat exchange layer IIB 3, the heat exchange layer IA 3 and the heat exchange layer IIB 3 are flower tubes, the heat exchange layer IA 3 and the heat exchange layer IIB 3 enter the geological heat layer and then change the direction to the direction far away from the water taking well A and the water returning well B through first bending, the distance between the heat exchange layer IA 3 and the heat exchange layer IIB 3 is far larger than the distance between the water taking well A and the water returning well B3 in a vertical well, and the tail portions of the heat exchange layer IA 3 and the heat exchange layer IIB 3 are changed in a close distance.
The heat exchange layer IA 3 and the heat exchange layer IIB 3 are horizontally arranged up and down, the tail part of the heat exchange layer IA 3 at the upper opposite position is bent downwards after being changed to the direction by the second bending, and the tail part of the heat exchange layer IA 3526 at the lower opposite position is bent upwards after being changed to the direction by the second bending, so that the tail parts of the heat exchange layer IA 3 and the heat exchange layer IIB 3 are formed to be converged at a short distance.
The heat exchange layer IA 3 and the heat exchange layer IIB 3 are arranged obliquely up and down, the tail part of the heat exchange layer IA 3 at the upper opposite position is bent downwards after being changed to the direction by the second bending, and the tail part of the heat exchange layer IA 3526 at the lower opposite position is bent upwards after being changed to the direction by the second bending, so that the tail parts of the heat exchange layer IA 3 and the heat exchange layer IIB 3 are formed to be converged at a short distance.
The heat exchange layer IA 3 and the heat exchange layer IIB 3 are arranged in a left-right inclined mode, the tail portion of the heat exchange layer IA 3 and the tail portion of the heat exchange layer IIB 3 are bent rightwards after the opposite position is changed to the left through second bending, the tail portion of the heat exchange layer IA 3 and the tail portion of the heat exchange layer IIB 3 are bent leftwards after the opposite position is changed to the right through second bending, and therefore close-distance intersection is formed.
The tail parts of the heat exchange layer IA 3 and the heat exchange layer IIB 3 are closely converged and then extend to a certain extent, and the extending sections are parallel to each other.
Claims (7)
1. A geothermal exploitation and utilization method is characterized by comprising the following process steps: the novel well drilling construction has the advantages that pumping and recharging equipment are installed, the novel well drilling construction is in butt joint with heating equipment, water is pumped when the machine is started, recharging is conducted, and water pumping and recharging are conducted periodically and alternately.
2. The geothermal mining and utilization method according to claim 1, wherein the drilling construction, first, performs geological exploration, i.e., determination of depth, position, and resource amount of geothermal energy storage, and second, determines the number and diameter of water intake wells and water return wells according to geothermal energy usage; thirdly, determining the minimum well spacing according to the well diameter and the well depth; fourthly, determining the number of water taking wells and water returning wells according to the minimum well spacing, determining the minimum ground floor area and the well hole layout mode, and fifthly, determining the structures of the water taking wells and the water returning wells, and determining the radiation distance of the far ends of the heat collecting pipes; and sixthly, completing the well drilling by using a directional drilling technology.
3. The geothermal mining and utilization method according to claim 2, wherein the wellbore layout is a rectangular layout or a circular layout, and the water intake wells and the water return wells are distributed in pairs nearby regardless of the rectangular layout or the circular layout, that is, the nearest water intake well (A) and water return well (B) are grouped, the water intake well (A) comprises a deep well pump layer I (A1), a light pipe layer I (A2) and a heat exchange layer I (A3), the water return well (B) comprises a deep well pump layer II (B1), a light pipe layer II (B2) and a heat exchange layer II (B3), the heat exchange layer I (A3) and the heat exchange layer II (B3) are flower tubes, the heat exchange layer I (A3) and the heat exchange layer II (B3) enter the geological heat layer and then are bent for the first time to extend in the direction away from the water intake well (A) and the water return well (B), and the distance between the heat exchange layer I (A3) and the heat exchange layer II (B3) is far greater than the vertical distance between the water intake well (A) and the water return well (B), and the tail parts of the heat exchange layer I (A3) and the heat exchange layer II (B3) are closely converged by changing the direction for the second time.
4. The geothermal mining and utilizing method according to claim 3, wherein the heat exchange layer I (A3) and the heat exchange layer II (B3) are horizontally arranged one above the other, and the tail portion thereof is bent downward after the opposite position is changed to the upper position by the second bending, and the tail portion thereof is bent upward after the opposite position is changed to the lower position by the second bending, thereby forming the tail portions of the heat exchange layer I (A3) and the heat exchange layer II (B3) to meet closely.
5. The geothermal mining and utilizing method according to claim 3, wherein the heat exchange layer I (A3) and the heat exchange layer II (B3) are arranged obliquely above each other, and the tail portion thereof is bent downward after the opposite position is changed to the upper position by the second bending and is bent upward after the opposite position is changed to the lower position by the second bending, thereby forming a close meeting of the tail portions of the heat exchange layer I (A3) and the heat exchange layer II (B3).
6. The geothermal mining and utilizing method according to claim 3, wherein the heat exchange layer I (A3) and the heat exchange layer II (B3) are arranged obliquely left and right, and the tail portion thereof is bent to the right after the opposite position is changed to the left by the second bending, and the tail portion thereof is bent to the left after the opposite position is changed to the right by the second bending, thereby forming the tail portions of the heat exchange layer I (A3) and the heat exchange layer II (B3) to meet closely.
7. A geothermal mining method according to claim 4, 5 or 6, wherein the first heat exchange layer (A3) and the second heat exchange layer (B3) are extended after meeting closely at their ends and the extended sections are parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111167680.2A CN113847744A (en) | 2021-10-07 | 2021-10-07 | Geothermal exploitation and utilization method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111167680.2A CN113847744A (en) | 2021-10-07 | 2021-10-07 | Geothermal exploitation and utilization method |
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| CN113847744A true CN113847744A (en) | 2021-12-28 |
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| CN202111167680.2A Pending CN113847744A (en) | 2021-10-07 | 2021-10-07 | Geothermal exploitation and utilization method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575836A (en) * | 2022-01-27 | 2022-06-03 | 陕西煤田地质勘查研究院有限公司 | Method for improving mining and irrigating efficiency of hydrothermal geothermal well group |
-
2021
- 2021-10-07 CN CN202111167680.2A patent/CN113847744A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575836A (en) * | 2022-01-27 | 2022-06-03 | 陕西煤田地质勘查研究院有限公司 | Method for improving mining and irrigating efficiency of hydrothermal geothermal well group |
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