CN117267968A - Dry-hot rock single-well open forced circulation efficient heat-taking system - Google Patents
Dry-hot rock single-well open forced circulation efficient heat-taking system Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 46
- 238000003860 storage Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims description 45
- 238000007789 sealing Methods 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 230000000704 physical effect Effects 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 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
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- 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
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a single-well open forced circulation high-efficiency heat-taking system for dry-heated rock, which comprises a gas lift heat-taking unit, a heat-taking medium reversing unit, a well bottom heat-taking unit and a heat utilization unit, wherein the gas lift heat-taking unit is arranged on the ground surface and consists of a gas lift pump assembly, a gas transmission pipeline and a gas collecting pipeline; the heat collecting medium reversing unit is arranged above the fracture thermal reservoir and consists of a reversing device; the bottom hole heat collecting unit consists of a sleeve and an adjustable packer, wherein the adjustable packer is arranged in the middle of the fracture heat reservoir and connected with the sleeve, and is connected with the booster pump through a gas charging and discharging pipeline; the heat utilization unit is arranged on the ground surface and consists of a water storage tank, a circulating booster pump, a heat user and a wellhead device which are connected in sequence; the water storage tank is connected with the gas lift pump assembly through a gas collecting pipeline, one end of the gas lift pump assembly of the gas pipeline is connected, and the other end of the gas pipeline is led into the sleeve; a heating medium inlet and outlet pipeline is formed between the sleeve and the wall of the dry-hot rock well; the sleeve is divided into two sections, and the two sections of sleeve are communicated through the reversing device.
Description
Technical Field
The invention belongs to the technical field of geothermal energy resource development and utilization, and particularly relates to a single-well open forced circulation high-efficiency heat taking system for dry-hot rock.
Background
In recent years, geothermal energy has received wide attention from various communities of society because of its advantages such as large reserves, wide distribution, and strong stability. The dry-hot rock is used as one of geothermal energy resources, and has the characteristics of high temperature, wide resource distribution, sustainable energy supply, wide application range, large development potential and the like. Therefore, the technology innovation is quickened, the technical bottleneck is broken through, and the high-efficiency and stable development and utilization of the geothermal resources of the dry-hot rock are realized.
The existing dry-hot rock resource development and utilization mode mainly takes a traditional enhanced geothermal system (CN 205939792U, CN206478884U, CN 209355517U), an artificial thermal reservoir is built by means of obtaining cracks through large-scale fracturing, and a heat collecting medium flows out into a ground utilization system through a production well after entering the crack reservoir through an injection well to exchange heat with rock. The crack generation and trend of the rock fracturing technology have great uncertainty, the investment is high, the problems of serious heat collecting medium loss, low recovery rate, easy induction of geological disasters such as earthquakes and the like, large environment and the like exist, so in recent years, expert students put forward a dry heat rock single well closed circulation heat collecting system (CN 110863800A), a coaxial or U-shaped well heat exchanger is arranged in a shaft, the heat collecting medium extracts heat from a thermal reservoir through a closed circulation system and is not contacted with surrounding stratum, and the system can avoid the heat collecting medium loss caused by large hydraulic fracturing construction, flow short circuit and flow dead angle, but has the defects of small heat collecting area and low heat collecting power with peripheral thermal storage; the improved dry-hot rock Shan Jingduo branch heat exchange system (CN 110863800A, CN 205957523U) and the multi-branch single horizontal well closed cycle heat exchange system (CN 106948795A) have the advantages that the heat exchange area and the heat extraction power are increased to a certain extent, but the heat exchange system is still limited, the branch horizontal wells are required to be directionally drilled, the drilling process is complex, the drilling period is long, and the cost is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, solve the problems of low heat extraction power, complex drilling process and high cost, and simultaneously further improve the heat extraction power of a dry-hot rock heat extraction system. The system utilizes the gas lift pump to lift the heated high Wen Caire medium to the ground utilization system, fully utilizes the self-siphon effect of the heat collection medium between the shaft and the inner pipe, and reduces the power consumption of the circulating pump; meanwhile, the reversing device is innovatively arranged above the fracture thermal reservoir, so that the low-temperature heat collecting medium can fully absorb heat of the fracture rock stratum around the shaft in the recharging process, the heat exchange area of the heat collecting medium in the fracture thermal reservoir can be increased, and the heat collecting power is further increased; in addition, an adjustable packer is arranged around the fracture thermal reservoir, the size of the packer can be dynamically adjusted according to the flow requirement of a ground thermal utilization system and the recharging capacity of the system, and the matching of high heat extraction power and optimal heat extraction flow is realized on the premise of ensuring complete recharging.
The invention aims at realizing the following technical scheme:
the open forced circulation high-efficiency heat extraction system for the dry-heated rock single well comprises a gas lift heat extraction unit, a heat extraction medium reversing unit, a well bottom heat extraction unit and a heat utilization unit, wherein the gas lift heat extraction unit is arranged on the ground surface and consists of a gas lift pump assembly, a gas transmission pipeline and a gas collecting pipeline; the heat collecting medium reversing unit is arranged above the fracture thermal storage layer and consists of a reversing device; the bottom hole heat collection unit consists of a sleeve and an adjustable packer, wherein the adjustable packer is arranged in the middle of the fracture heat reservoir and connected with the sleeve, and is connected with a pressurizing pump arranged on the ground surface through an inflation and deflation pipeline; the heat utilization unit is arranged on the ground surface and consists of a water storage tank, a circulating booster pump, a heat user and a wellhead device which are connected in sequence;
the water storage tank is connected with the gas lift pump assembly through a gas collecting pipeline, one end of the gas transmission pipeline is connected with the gas lift pump assembly, and the other end of the gas transmission pipeline is led into the sleeve;
the sleeve is arranged in a dry hot rock well in the stratum, and a heating medium inlet and outlet pipeline is formed between the sleeve and the dry hot rock well wall;
the sleeve is divided into two sections, and the two sections of sleeve are communicated through the reversing device.
Further, the reversing device consists of an inner pipe, an outer pipe, an inner pipe and outer pipe connecting curved surface, a separation section and a baffle, wherein the separation section is arranged in the middle of the inner pipe to separate the inner pipe into an upper part and a lower part which are not communicated with each other, the upper part is a high Wen Caire medium output channel, and the lower part is a low-temperature heat collecting medium return channel; the reversing device is centrosymmetric with the separation section as the center;
the inner pipes above and below the separation section are respectively provided with a production hole and a backflow hole, baffles are arranged between the inner pipes and the outer pipes at the upper edges of the production holes and the lower edges of the backflow holes, a low Wen Caire medium backflow channel is jointly formed above the inner pipes, the outer pipes, the backflow holes and the baffles, and a high Wen Caire medium production channel is jointly formed below the inner pipes, the outer pipes, the production holes and the baffles;
the inner and outer tube connecting curved surfaces are provided with a plurality of through holes, so that the inflow of fluid outside the annular space is ensured, the through holes on the inner and outer tube connecting curved surfaces at the upper part of the reversing device are channels for low-temperature heat collecting media to flow into the reversing device, and the through holes on the inner and outer tube connecting curved surfaces at the lower part of the reversing device are channels for high Wen Caire media to flow into the reversing device.
Further, the partition section is made of a heat insulating material.
Furthermore, the reversing device is connected with the sleeve through a flange or a screw thread, the outer tube of the reversing device is completely sealed with the wall of the dry hot rock well through a sealing ring, the reversing device is arranged above a fracture thermal reservoir at the bottom of the well, and the specific installation position is determined by the ground temperature condition of the dry hot rock well.
Further, a gas transmission pipeline of the gas lift heat collection unit is led into a high Wen Caire medium output channel inside the sleeve, gas can form bubbles in the inner pipe and ascend in the inner pipe, and the heat collection medium is brought into the water storage tank; the depth of the gas pipeline in the sleeve is adjusted according to the temperature of the dry thermal rock thermal reservoir, the type and physical property of the heat collecting medium and the thermosiphon effect intensity of the heat collecting medium in the well, and the gas pipeline is made of pressure-resistant and high-temperature-resistant materials, such as a silicone tube.
Furthermore, the bottom hole heat collecting unit means that the low-temperature reflux heat collecting medium enters the fracture thermal reservoir from the lower part under the actions of the circulating booster pump, the heat collecting medium self-siphon effect and the adjustable packer, and flows out from the upper part of the fracture thermal reservoir after full heat exchange.
Furthermore, the adjustable packer consists of an injection fluid pressurizing pipeline, a high-temperature-resistant expansion rubber ring and a sealing gasket, wherein the upper part of the injection fluid pressurizing pipeline is in sealing connection with the pressurizing pump, the lower part of the injection fluid pressurizing pipeline passes through a sealing ring of the reversing device to be in sealing connection with the high-temperature-resistant expansion rubber ring, and the contact position of the injection fluid pressurizing pipeline and the sealing ring of the reversing device is completely sealed; the fluid injection pressure of the high-temperature-resistant expansion rubber ring is determined by the recharging condition of the dry-hot rock well and the flow demand of the ground heat utilization unit on the heat collecting medium; the joint of the sealing gasket and the sleeve is completely sealed.
Further, the heat utilization unit refers to that a high Wen Caire medium flowing out of the wellhead device after heat is taken flows into a heat user from the water storage tank under the action of the circulating pressurizing pump, and a low-temperature heat collection medium fully utilized by the heat user enters a low-temperature heat collection medium return channel from the wellhead device and starts the next heat taking process; the junction of the wellhead device and the heating medium inlet and outlet pipeline, the gas pipeline and the inflation and deflation pipeline is completely sealed; the high-temperature gas at the upper part of the water tank enters the gas lift pump assembly for recycling; the circulating booster pump is used for driving the high Wen Caire medium to circulate in the ground heat utilization unit, completing the heat exchange process, pressurizing the exothermic low-temperature heat collecting medium and expanding the heat exchange range of the heat collecting medium in the crack heat reservoir.
Further, the heat collecting medium adopts water or carbon dioxide.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. compared with the traditional enhanced geothermal system, the heat extraction system does not need to carry out large-scale fracturing with communication property, and reservoirs at the periphery of the bottom of the dry hot rock well are subjected to small-range fracturing, so that investment cost and loss rate of heat extraction media are reduced; compared with a dry-heat rock closed type heat extraction system, the heat extraction medium in the system provided by the invention can fully absorb the heat of the stratum and flow into the crack heat storage layer for heat exchange, so that the heat exchange area is increased, and the heat extraction power of the system is further improved.
2. The heat taking system creatively applies the gas lift pump to the dry-heat rock heat taking system, and conveys low-density gas into the sleeve to discharge the high Wen Caire medium which is fully absorbed in heat to the ground heat utilization unit, so that the limitation that the submersible pump cannot be installed due to the small well diameter is eliminated, the well digging cost is reduced, the thermosiphon effect of the heat collecting medium in heat taking can be excited, the power consumption of the circulating pump is reduced, the electric energy is saved, the running cost of the system is further reduced, and the economical efficiency is superior to that of the existing dry-heat rock heat taking system.
3. The reversing device is innovatively arranged above the fracture thermal reservoir, so that the heat collecting medium can fully absorb the heat of the stratum and enter the fracture thermal reservoir from the bottom of the dry thermal rock well through the sleeve, and is influenced by the gravity of the heat collecting medium and the blocking effect of the packer, and the heat collecting medium flows towards the far end of the fracture thermal reservoir, so that the heat exchange area is increased, and the heat exchange capacity is improved; meanwhile, the heat collecting medium after heat exchange flows into the sleeve from the annular cavity by means of the reversing device, so that heat dissipation loss to the stratum in the production process is reduced, and the heat collecting power of the system is further improved.
4. The adjustable packer is arranged around the fracture thermal reservoir in the heat extraction system, so that the backflow low-temperature heat extraction medium can be prevented from directly flowing upwards to form a thermal short circuit without entering the fracture thermal reservoir, the size of the packer can be dynamically adjusted according to the flow requirement of the ground heat utilization system and the recharging capacity of a well, complete recharging is ensured, and meanwhile, the matching of high heat extraction power and optimal heat extraction flow is realized.
Drawings
FIG. 1 is a schematic diagram of a heat extraction system according to the present invention.
Fig. 2 is a schematic two-dimensional structure of the reversing device.
Fig. 3 is a schematic three-dimensional structure of the reversing device.
FIG. 4 is a schematic illustration of the configuration of an adjustable packer.
Reference numerals: 1-water storage tank, 2-circulating booster pump, 3-heat user, 4-wellhead device, 5-dry-hot rock well wall, 6-sleeve, 7-reversing device, 7-1-inner tube, 7-2-through hole, 7-3-outer tube, 7-4-separation section, 7-5-reflux hole, 7-6-baffle, 7-7-through hole and 7-8-output hole; 8-adjustable packer, 8-1-injection fluid pressurizing pipeline, 8-2-high temperature resistant expansion rubber ring, 8-3-sealing gasket; 9-fracture thermal reservoir, 10-stratum, 11-booster pump, 12-gas lift pump assembly, 12-1-gas transmission pipeline and 12-2-gas collection pipeline.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in FIG. 1, the system is a single-well open forced circulation high-efficiency heat-taking system diagram of dry-hot rock, and consists of a gas lift heat-taking unit, a heat-taking medium reversing unit, a well bottom heat-taking unit and a heat utilization unit.
The gas lift heat collecting unit is arranged on the ground surface and consists of a gas lift pump assembly 12, a gas pipeline 12-1 and a gas collecting pipeline 12-2; one end of the gas transmission pipeline 12-1 is connected with the gas lift pump assembly 12, and the other end of the gas transmission pipeline is led into a high Wen Caire medium output channel inside the sleeve 6, and the high Wen Caire medium is lifted into the water storage tank 1 by means of low-density gas; the gas collecting pipeline 12-2 is connected with the upper part of the water storage tank 1 and the gas lifting pump assembly 12, and is used for introducing high-temperature gas in the water storage tank 1 into the gas lifting pump assembly 12 for recycling.
The heat collecting medium reversing unit is arranged above a fracture thermal reservoir 9, the main body of the heat collecting medium reversing unit is a fluid reversing device 7, as shown in fig. 2, the reversing device 7 consists of an inner pipe 7-1, an outer pipe 7-3, an inner pipe connecting curved surface, an outer pipe connecting curved surface, a separation section 7-4 and a baffle 7-6, and the interior of the reversing device 7 is in central symmetry with the separation section 7-4 as a center; the middle position of the inner tube 7-1 is provided with a separation section 7-4, the inner tube 7-1 is divided into an upper part and a lower part which are not communicated, the upper part is a high Wen Caire medium output channel, the lower part is a low-temperature heat collecting medium return channel, and the separation section 7-4 is made of heat insulating materials;
the inner pipes above and below the separation section are respectively provided with a production hole 7-8 and a backflow hole 7-5, a baffle 7-6 is arranged between the inner pipe 7-1 and the outer pipe 7-3 which are positioned at the upper edge of the production hole 7-8 and the lower edge of the backflow hole 7-5, a low Wen Caire medium backflow channel is formed by the inner pipe 7-1, the outer pipe 7-3, the backflow hole 7-5 and the baffle 7-6, and a high Wen Caire medium production channel is formed by the inner pipe 7-1, the outer pipe 7-3, the production hole 7-8 and the baffle 7-6;
the inner and outer tube connecting curved surfaces are provided with a plurality of through holes 7-7, so that the inflow of fluid outside the annular space is ensured, the through holes 7-2 on the inner and outer tube connecting curved surfaces at the upper part of the reversing device are channels for the low-temperature heat collecting medium to flow into the reversing device, and the through holes 7-7 on the inner and outer tube connecting curved surfaces at the lower part of the reversing device are channels for the high Wen Caire medium to flow into the reversing device. The sum of the areas of all through holes 7-2 and 7-7 is equal to the inner tube flow area.
The bottom hole heat collecting unit is composed of a sleeve 6 and an adjustable packer 8, the adjustable packer 8 is arranged in the middle of a fracture heat reservoir 9, the adjustable packer 8 is connected with a booster pump 11 through an injection fluid pressurized pipeline 8-1, the adjustable packer 8 is composed of an injection fluid pressurized pipeline 8-1, a high temperature resistant expansion rubber ring 8-2 and a sealing gasket 8-3, the upper part of the injection fluid pressurized pipeline 8-1 is connected with the booster pump 11, the lower part of the injection fluid pressurized pipeline passes through a sealing ring of a reversing device 7 to be connected with the high temperature resistant expansion rubber ring 8-2, the contact position of the sealing ring of the reversing device 7 is completely sealed, and the joint of the sealing gasket 8-3 and the sleeve 6 is completely sealed. Specifically, the gasket in the adjustable packer 8 is an elastic rubber ring with an inner diameter slightly smaller than the outer diameter of the sleeve 6, and the gasket 8-3 cannot move up and down after being mounted at a designated position due to the diameter difference. The high-temperature resistant expansion rubber ring is arranged in the middle of the two sealing gaskets 8-3, and the installation position of the high-temperature resistant expansion rubber ring 8-2 can be fixed.
The heat utilization unit is arranged on the ground surface and consists of a wellhead device 4, a water storage tank 1, a circulating booster pump 2 and a heat user 3. The water storage tank 1, the circulating booster pump 2, the heat user 3 and the wellhead device 4 are connected in sequence. The wellhead 4 is disposed at the surface and at the top of the hot dry rock well.
Specifically, for the application of the open forced circulation high-efficiency heat-taking system of the dry-hot rock single well, the working process is as follows:
the low-temperature heat collecting medium after heat release in the heat user 3 enters a low-temperature heat collecting medium backflow channel between a dry thermal rock well wall 5 and a sleeve 6 through a wellhead device 4, fully absorbs heat in a stratum 10, enters the low-temperature heat collecting medium backflow channel between an inner tube 7-1 and an outer tube 7-3 of the reversing device 7 through a through hole 7-2, enters the low-temperature heat collecting medium backflow channel inside the inner tube 7-1 under the action of a baffle 7-6 and a backflow hole 7-5, completes a reversing process, then flows into the bottom of a crack thermal storage layer 9 from the inside of the sleeve 6, and flows into the heat collecting medium storage layer 2 through a high-temperature gas pump under the action of a low-density gas, and flows into the heat collecting channel of the heat collecting medium storage layer 2 through the high-temperature gas pump 62 in the high-pressure pipe 1 by utilizing the effect of a low-density gas pump under the action of a gas lift pump under the action of a low-pressure pump, wherein the low Wen Caire medium is diffused distally in the crack thermal storage layer 9, enters the reversing device 7 through a through hole 7-7 at the bottom of the reversing device 7 after heat exchange, enters the medium output channel of the high-Wen Caire under the action of the high-pressure pump, flows into the sleeve 6, and flows into the high-temperature storage layer 6212 by the high-pressure gas storage layer 2, and then flows into the heat collecting medium storage layer 2 by the heat storage layer 2.
The invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical aspects of the present invention, and is intended to be illustrative only and not limiting. Numerous specific modifications can be made by those skilled in the art without departing from the spirit of the invention and scope of the claims, which are within the scope of the invention.
Claims (9)
1. The open forced circulation high-efficiency heat extraction system for the dry-heated rock single well is characterized by comprising a gas lift heat extraction unit, a heat extraction medium reversing unit, a well bottom heat extraction unit and a heat utilization unit, wherein the gas lift heat extraction unit is arranged on the ground surface and consists of a gas lift pump assembly, a gas transmission pipeline and a gas collecting pipeline; the heat collecting medium reversing unit is arranged above the fracture thermal storage layer and consists of a reversing device; the bottom hole heat collection unit consists of a sleeve and an adjustable packer, wherein the adjustable packer is arranged in the middle of the fracture heat reservoir and connected with the sleeve, and is connected with a pressurizing pump arranged on the ground surface through an inflation and deflation pipeline; the heat utilization unit is arranged on the ground surface and consists of a water storage tank, a circulating booster pump, a heat user and a wellhead device which are connected in sequence;
the water storage tank is connected with the gas lift pump assembly through a gas collecting pipeline, one end of the gas transmission pipeline is connected with the gas lift pump assembly, and the other end of the gas transmission pipeline is led into the sleeve;
the sleeve is arranged in a dry hot rock well in the stratum, and a heating medium inlet and outlet pipeline is formed between the sleeve and the dry hot rock well wall;
the sleeve is divided into two sections, and the two sections of sleeve are communicated through the reversing device.
2. The single-well open forced circulation high-efficiency heat extraction system of dry-hot rock according to claim 1, wherein the reversing device comprises an inner pipe, an outer pipe, an inner pipe connecting curved surface, a separating section and a baffle, the separating section is arranged in the middle of the inner pipe and separates the inner pipe into an upper part and a lower part which are not communicated with each other, the upper part is a high Wen Caire medium output channel, and the lower part is a low-temperature heat extraction medium reflux channel; the reversing device is centrosymmetric with the separation section as the center;
the inner pipes above and below the separation section are respectively provided with a production hole and a backflow hole, baffles are arranged between the inner pipes and the outer pipes at the upper edges of the production holes and the lower edges of the backflow holes, a low Wen Caire medium backflow channel is jointly formed above the inner pipes, the outer pipes, the backflow holes and the baffles, and a high Wen Caire medium production channel is jointly formed below the inner pipes, the outer pipes, the production holes and the baffles;
the inner and outer tube connecting curved surfaces are provided with a plurality of through holes, so that the inflow of fluid outside the annular space is ensured, the through holes on the inner and outer tube connecting curved surfaces at the upper part of the reversing device are channels for low-temperature heat collecting media to flow into the reversing device, and the through holes on the inner and outer tube connecting curved surfaces at the lower part of the reversing device are channels for high Wen Caire media to flow into the reversing device.
3. The dry rock single well open forced circulation high efficiency heat extraction system of claim 2, wherein said separator section is made of a thermally insulating material.
4. The single-well open forced circulation efficient heat extraction system for the dry-hot rock according to claim 1 or 2, wherein the reversing device is connected with the sleeve through a flange or a screw thread, the outer tube of the reversing device is completely sealed with the wall of the dry-hot rock through a sealing ring, the reversing device is arranged above a fracture thermal reservoir at the bottom of the well, and the specific installation position is determined by the ground temperature condition of the dry-hot rock well.
5. The dry-heated rock single-well open forced circulation efficient heat extraction system according to claim 1, wherein a gas transmission pipeline of the gas lift heat extraction unit is led into a high Wen Caire medium output channel inside a sleeve, gas can form bubbles in an inner pipe and ascend in the inner pipe, and a heat extraction medium is brought into a water storage tank; the depth of the gas pipeline in the sleeve is adjusted according to the temperature of the hot reservoir of the dry-hot rock, the type and physical property of the heat collecting medium and the thermosiphon effect intensity of the heat collecting medium in the well, and the gas pipeline is a silicone tube.
6. The single-well open forced circulation high-efficiency heat extraction system for dry-heated rock according to claim 1, wherein the bottom hole heat extraction unit is characterized in that a low-temperature reflux heat extraction medium enters a fracture thermal reservoir from the lower part under the actions of a circulating booster pump, a heat extraction medium self-siphon effect and an adjustable packer, and flows out from the upper part of the fracture thermal reservoir after sufficient heat exchange.
7. The open forced circulation high-efficiency heat extraction system for the dry-hot rock single well is characterized in that the adjustable packer consists of an injection fluid pressurizing pipeline, a high-temperature-resistant expansion rubber ring and a sealing gasket, wherein the upper part of the injection fluid pressurizing pipeline is in sealing connection with a pressurizing pump, the lower part of the injection fluid pressurizing pipeline passes through a sealing ring of a reversing device to be in sealing connection with the high-temperature-resistant expansion rubber ring, and the contact position of the injection fluid pressurizing pipeline and the sealing ring of the reversing device is completely sealed; the fluid injection pressure of the high-temperature-resistant expansion rubber ring is determined by the recharging condition of the dry-hot rock well and the flow demand of the ground heat utilization unit on the heat collecting medium; the joint of the sealing gasket and the sleeve is completely sealed.
8. The single-well open forced circulation high-efficiency heat extraction system of dry-heat rock according to claim 1, wherein the heat utilization unit is characterized in that high Wen Caire medium flowing out from a wellhead device after heat extraction flows into a heat user from a water storage tank under the action of a circulating pressurizing pump, and low-temperature heat extraction medium fully utilized by the heat user enters a low-temperature heat extraction medium return channel from the wellhead device and starts the next heat extraction process; the junction of the wellhead device and the heating medium inlet and outlet pipeline, the gas pipeline and the inflation and deflation pipeline is completely sealed; the high-temperature gas at the upper part of the water tank enters the gas lift pump assembly for recycling; the circulating booster pump is used for driving the high Wen Caire medium to circulate in the ground heat utilization unit, completing the heat exchange process, pressurizing the exothermic low-temperature heat collecting medium and expanding the heat exchange range of the heat collecting medium in the crack heat reservoir.
9. The dry-hot rock single-well open forced circulation efficient heat extraction system according to claim 1, wherein the heat extraction medium adopts water or carbon dioxide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311336064.4A CN117267968B (en) | 2023-10-16 | 2023-10-16 | Dry-hot rock single-well open forced circulation efficient heat-taking system |
| NL2038307A NL2038307A (en) | 2023-10-16 | 2024-07-23 | A high-efficient heat extraction system for a single well open-loop forced circulation in hot dry rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311336064.4A CN117267968B (en) | 2023-10-16 | 2023-10-16 | Dry-hot rock single-well open forced circulation efficient heat-taking system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117267968A true CN117267968A (en) | 2023-12-22 |
| CN117267968B CN117267968B (en) | 2024-08-06 |
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| CN202311336064.4A Active CN117267968B (en) | 2023-10-16 | 2023-10-16 | Dry-hot rock single-well open forced circulation efficient heat-taking system |
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| NL (1) | NL2038307A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN209355517U (en) | 2018-11-16 | 2019-09-06 | 陕西煤田地质勘查研究院有限公司 | A kind of dry-hot-rock geothermal development system |
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| CN117267968B (en) | 2024-08-06 |
| NL2038307A (en) | 2024-08-29 |
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