CN116358175B - Single-well dry hot rock injection fluid heat exchange enhancement device and operation method thereof - Google Patents
Single-well dry hot rock injection fluid heat exchange enhancement device and operation method thereof Download PDFInfo
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- CN116358175B CN116358175B CN202310322302.XA CN202310322302A CN116358175B CN 116358175 B CN116358175 B CN 116358175B CN 202310322302 A CN202310322302 A CN 202310322302A CN 116358175 B CN116358175 B CN 116358175B
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- 239000012530 fluid Substances 0.000 title claims abstract description 163
- 238000002347 injection Methods 0.000 title claims abstract description 87
- 239000007924 injection Substances 0.000 title claims abstract description 87
- 239000011435 rock Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000011295 pitch Substances 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010998 test method 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
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/08—Tubular elements crimped or corrugated in longitudinal section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Sustainable Energy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to the technical field of dry hot rock exploitation engineering, and discloses a single-well dry hot rock injection fluid heat exchange enhancement device and an operation method thereof. The invention comprises a heat exchange base, a fluid connection rod and a spiral ring pipe, wherein the heat exchange base is arranged in a dry-hot rock heat exchange well and comprises a fluid injection annular table, a fluid extraction table arranged on the inner side of the fluid injection annular table, and a connection rod mounting groove is formed between the fluid injection annular table and the fluid extraction table at intervals; the fluid connecting rod is matched and arranged in the connecting rod mounting groove, is divided into a fluid guide end connected with the connecting rod mounting groove, and extends to the connecting end of the heat insulation pipeline outside the heat exchange base. The device can realize basic heat collection function and simultaneously gives consideration to how to improve the heat exchange efficiency of the device. Compared with the existing water injection measure, the heat collection can improve the heat exchange efficiency by 11.3532 percent.
Description
Technical Field
The invention relates to the technical field of dry hot rock exploitation engineering, in particular to a single-well dry hot rock injection fluid heat exchange enhancement device and an operation method thereof.
Background
Dry hot rock is typically at a temperature greater than 180 ℃, a depth of burial of several kilometers, a height Wen Yanti where there is no fluid or only a small amount of subsurface fluid (dense, watertight). The dry-hot rock is a hot rock mass, and at present, cold water injection and heat collection are mainly adopted, and the working principle is that cold water injected into the bottom of a well is in heat exchange with the hot rock mass, so that the utilization of a rock mass heat source is realized. Two wells are used on a mine field to form an injection and production well group, and a circulating crack system is generated among the wells through fracturing, so that one injection of cold water and the other production of hot water are realized.
Enhanced Geothermal Systems (EGS) are a more engineering practice for dry rock geothermal exploitation. The system forms a communicated fracture network between two or more wells through hydraulic fracturing, and then the working medium circularly flows in the underground rock body in a way of pumping and injecting fluid working medium, so that geothermal energy is continuously exploited. The water outlet temperature and the heat recovery amount of the method are high, and the method has large-scale power generation potential and is a main flow development direction for recovering the heat energy of the dry hot rock for a long time.
However, at present, the technology still has the problems of difficult underground communication, serious working medium loss, high investment, high technical risk and the like. Worldwide, only a few engineering projects can realize continuous commercial operation, and the mode needs to increase the number of wells and fracturing measures to realize effective thermal recovery, so that the overall engineering cost is high, and the heat dissipation from a heat source to the surface along a shaft is serious.
Therefore, the single-well circulation thermal model with self injection and self production is widely applied, and the drilling workload and the fracturing cost are greatly reduced. However, the heat collection mode still has the phenomenon of low heat exchange efficiency, mainly because the cold water circulated by a single well has short contact heat source contact distance and short heat exchange time.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The invention is provided in view of the problem of low heat exchange efficiency of the existing self-injection self-production single-well circulating heat production system.
Therefore, the invention aims to provide a single-well dry hot rock injection fluid heat exchange enhancement device, which aims to: and the cold water contact heat source along distance is increased, and the heat collection efficiency under single well circulation is improved.
In order to solve the technical problems, the invention provides the following technical scheme: the device comprises a heat exchange base, a fluid connection rod and a spiral ring pipe, wherein the heat exchange base is arranged in a dry-hot rock heat exchange well and comprises a fluid injection annular table, a fluid extraction table arranged on the inner side of the fluid injection annular table, and a connection rod mounting groove is formed between the fluid injection annular table and the fluid extraction table at intervals; the fluid connecting rod is arranged in the connecting rod mounting groove in a matching way, is divided into a fluid guide end connected with the connecting rod mounting groove, and extends to a heat insulation pipeline connecting end at the outer side of the heat exchange base; and the spiral ring pipe is arranged inside the heat exchange base and comprises a fluid injection port connected with the fluid injection ring table, a fluid extraction port connected with the fluid extraction table and a heat exchange pipe body connected with the fluid injection port and the fluid extraction port.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: the fluid injection annular table is provided with a liquid injection port matched with the fluid injection port, and the fluid extraction table is provided with a liquid extraction port matched with the fluid extraction port in a penetrating way.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: and a locating groove is formed in one end, far away from the liquid collecting port, of the connecting rod mounting groove, and a clamping piece matched with the locating groove is arranged at the fluid guide end, far away from the connecting end of the heat insulation pipeline.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: the straight line distance from the geometric center position of the fluid extraction platform to the outer edge of the fluid injection ring platform is the outer diameter of the base, the distance from the fluid injection port to the fluid extraction port is the aperture of the base, and a well distance is formed between adjacent dry-hot rock heat exchange wells.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: the outer diameter of the base is 20cm, the aperture of the base is 17cm, and the well distance is 530m.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: the heat exchange tube body comprises a single spiral tube body with the same multi-section structure, and the single spiral tube body is provided with a first tube orifice and a second tube orifice which are communicated with each other.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: the radial pipe diameter of the first pipe orifice is the pipe body caliber, the spiral inner diameter of the single spiral pipe body is the spiral diameter, and the straight line distance between the first pipe orifice and the second pipe orifice in the direction parallel to the axis of the single spiral pipe body is the screw pitch.
As a preferable scheme of the single-well dry hot rock injection fluid heat exchange enhancing device, the invention comprises the following steps: the caliber of the pipe body is 2.5cm, the spiral diameter is 1.0cm, and the thread pitch is 4cm.
It is another object of the present invention to provide a method of operating a single well dry hot rock injection fluid heat exchange enhancement device employing a single well dry hot rock injection fluid heat exchange enhancement device as described above.
As a preferable scheme of the operation method of the single-well dry hot rock injection fluid heat exchange enhancement device, the operation method comprises the following steps: the method comprises the following operation steps:
after the completion of the dry-hot rock casing, the heat exchange base is lowered into the rock surface at the bottom of the dry-hot rock heat exchange well by using a steel wire;
connecting the fluid connecting rod with the heat-insulating oil pipe, then descending the heat-insulating oil pipe connected with the fluid connecting rod into a shaft to the upper surface of the heat exchange base, and realizing the sealing connection between the clamping piece and the positioning groove in a gravity pressing mode;
injecting fluid from the annular space of the heat-insulating oil pipe and the sleeve at the wellhead, allowing the injected fluid to flow in from the fluid injection annular table of the heat exchange base, enabling the fluid to perform sufficient heat exchange with the rock mass through the spiral annular pipe flow passage arranged in the heat exchange base, allowing the fluid to flow into the inner cavity of the fluid connecting rod from the fluid extraction table of the heat exchange base, and finally extracting hot water from the heat-insulating oil pipe at the wellhead.
Compared with the prior art, the invention has the following beneficial effects:
the utility model discloses a single underground dry hot rock injection fluid heat transfer enhancement device, it has taken into account how to promote the heat exchange efficiency of device when realizing basic heat collection function.
The pipe body has obvious heat exchange efficiency enhancement, and the heat exchange efficiency can be improved 11.3532 percent by increasing the flow path of the injection and production circulating fluid in the high-heat rock body at the bottom of the well and increasing the contact area of the fluid and the rock body compared with the heat production of the existing water injection measures.
The required metal material has low requirement on strength, does not need to change the existing well structure, does not need to additionally introduce other working fluids, has low manufacturing cost and installation cost, is used as a 'pump-free' high-efficiency single-well geothermal exploitation technology, can also be used for exploiting water-heating geothermal resources in a region with limited geothermal water exploitation, has wide application range and has application prospect of forming standardized products.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic diagram of a heat exchange base structure of a single-well dry hot rock injection fluid heat exchange enhancing device.
Fig. 2 is a schematic diagram of a fluid connection rod structure of the single-well dry hot rock injection fluid heat exchange enhancing device.
Fig. 3 is a schematic diagram of a spiral loop of the single-well dry hot rock injection fluid heat exchange enhancing device.
FIG. 4 is a schematic view of the structure of a single spiral pipe body of the spiral ring pipe of the present invention.
Fig. 5 is a schematic top view of a spiral loop of the single well dry hot rock injection fluid heat exchange enhancement device of the present invention.
Fig. 6 is a schematic diagram of the positional relationship of the heat exchange base of the present invention.
Fig. 7 is a schematic diagram of regular well pattern development of the single well dry hot rock injection fluid heat exchange enhancement device of the present invention.
Fig. 8 is a schematic diagram of the overall structure of the single well dry hot rock injection fluid heat exchange enhancement device of the present invention.
Fig. 9 is a schematic perspective view of a heat exchange base of the single well dry hot rock injection fluid heat exchange enhancing device of the present invention.
Fig. 10 is a finite element amplification schematic diagram under software simulation of the single well dry hot rock injection fluid heat exchange enhancement device of the present invention.
FIG. 11 shows the heat exchange efficiency enhancement of the single-well dry hot rock injection fluid heat exchange enhancement device based on different hole pitches when the hole pitch is 530m.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Further, in describing the embodiments of the present invention in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of description, and the schematic is only an example, which should not limit the scope of protection of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Example 1
Referring to fig. 1 to 3 and 7, for a first embodiment of the present invention, a single well dry hot rock injection fluid heat exchange enhancing device is provided, which includes a heat exchange base 100, a fluid connection rod 200, and a spiral ring 300. The heat exchange base 100 is disposed in the dry-hot rock heat exchange well a, and includes a fluid injection annular table 101, a fluid extraction table 102 disposed inside the fluid injection annular table 101, and a connecting rod mounting groove 103 formed between the fluid injection annular table 101 and the fluid extraction table 102.
In this embodiment, the fluid connection rod 200 is cooperatively disposed in the connection rod mounting groove 103, and is divided into a fluid guiding end 201 connected with the connection rod mounting groove 103, and a heat insulation pipe connecting end 202 extending to the outer side of the heat exchange base 100; and a spiral ring pipe 300 provided inside the heat exchange base 100 and including a fluid injection port 301 connected to the fluid injection stage 101, a fluid extraction port 302 connected to the fluid extraction stage 102, and a heat exchange tube 303 connecting the fluid injection port 301 and the fluid extraction port 302.
In the use process, the heat exchange base 100 of the invention has larger weight, if the assembled heat exchange base 100 and the fluid connection rod 200 are connected with an oil pipe and then directly put into a rock surface at the bottom of the well, the possibility of damage of the oil pipe can exist in the process of putting into the well, so after the completion of a dry-hot rock casing, the heat exchange base 100 is firstly put into the rock surface at the bottom of the well by using a steel wire.
The heat exchange base 100 adopts a plurality of groups of complex spiral line channel structures, so that the weight of the base device is reduced while the fluid contact area is increased, and the heat exchange base has good advantages for salvaging and taking out the base of the device, and is beneficial to recovery and reuse of the device.
Example 2
Referring to fig. 1 to 9, a second embodiment of the present invention is different from the first embodiment in that: the fluid injection stage 101 is provided with a fluid injection port 101a which is matched with the fluid injection port 301, and the fluid extraction stage 102 is provided with a fluid extraction port 102a which is matched with the fluid extraction port 302. The connecting rod mounting groove 103 is provided with a positioning groove 103a, and the fluid guiding end 201 is provided with a clamping piece 201a matched with the positioning groove 103a away from the heat insulation pipeline connecting end 202.
The device adopts a detachable buckle principle to connect the heat-insulating oil pipe with the device base, can realize the bottom hole sealing effect by pressing down the pipe column under the gravity, and avoids using a threaded interface for sealing. For a metal pipe column with the length of several kilometers, the operation cost for realizing thread sealing in wellhead rotation operation is saved, and the operation safety environment of the pipe column is ensured.
In this embodiment, the straight line distance from the geometric center of the fluid extraction table 102 to the outer edge of the fluid injection ring table 101 is the base outer diameter A1, the distance from the fluid injection port 101a to the fluid extraction port 102a is the base aperture A2, and a well distance A3 is formed between adjacent dry and hot rock heat exchange wells a.
In this embodiment, the heat exchange tube 303 includes a single spiral tube 303a having a plurality of sections of the same structure, and the single spiral tube 303a has a first nozzle 303a-1 and a second nozzle 303a-2 which are in communication with each other. The radial pipe diameter of the first pipe orifice 303a-1 is the pipe body caliber C1, the spiral inner diameter of the single spiral pipe body 303a is the spiral diameter C2, and the straight line distance between the first pipe orifice 303a-1 and the second pipe orifice 303a-2 is the screw pitch C3.
The rest of the structure is the same as that of embodiment 1.
Example 3
Referring to fig. 1 to 9, for a third embodiment of the present invention, which is based on the single-well dry hot rock injection fluid heat exchange enhancing device as described above, a method for operating the single-well dry hot rock injection fluid heat exchange enhancing device is provided, comprising the following operation steps:
after the completion of the dry heat rock casing, the heat exchange base 100 is lowered into the bottom rock face of the dry heat rock heat exchange well A by using a steel wire;
connecting the fluid connection rod 200 with the heat insulation oil pipe, then lowering the heat insulation oil pipe connected with the fluid connection rod 200 into a shaft to the upper surface of the heat exchange base 100, and realizing the sealing connection of the clamping piece 201a and the positioning groove 103a in a gravity pressing mode;
fluid is injected from the annular space of the heat-insulating oil pipe and the sleeve at the wellhead, the injected fluid flows in from the fluid injection annular table 101 of the heat exchange base 100, passes through the spiral annular pipe 300 flow channel arranged in the heat exchange base 100, so that the fluid and the rock mass perform sufficient heat exchange, then flows into the inner cavity of the fluid connecting rod 200 from the fluid extraction table 102 of the heat exchange base 100, and finally hot water is extracted from the heat-insulating oil pipe at the wellhead.
Specifically, the fluid connection rod 200 is connected to the bottom of the heat insulation oil pipe through the connection end 202 on the connection rod, then the heat insulation oil pipe connected with the fluid connection rod 200 is lowered into the shaft to the upper surface of the heat exchange base 100, the position of the clamping piece 201a at the bottom of the fluid connection rod 200 is adjusted to correspond to the positioning groove 103a in the heat exchange base 100, and finally the heat exchange base 100 is in sealed connection with the positioning groove 103a in a gravity pressing mode.
Fluid is injected from the annular space of the oil pipe and the sleeve of the wellhead, and the heat conductivity coefficient of water in nonmetallic liquid is the largest in consideration of engineering practice, so that the fluid in the invention adopts cold water, the injected water flows in from the liquid injection port 101a of the heat exchange base 100, passes through the spiral ring pipe 300 in the heat exchange base 100, enables the fluid to perform full heat exchange with the rock mass, then flows into the inner cavity of the fluid connection rod 200 from the liquid extraction port 102a of the fluid extraction platform 102, and finally extracts hot water from the heat insulation oil pipe of the wellhead.
The rest of the structure is the same as that of embodiment 2.
Example 4
Referring to fig. 1, a fourth embodiment of the present invention is shown, which differs from the third embodiment in that:
when a single-well heat collection project is carried out, the temperature of the dry-hot rock is 200 ℃, and the heat conductivity, the tensile strength, the yield strength, the hardness and the price of different materials at 200 ℃ are analyzed, so that the cost performance of copper is highest.
TABLE 1 Material Properties
The rest of the structure is the same as that of embodiment 3.
Example 5
Referring to fig. 3 to 5, a fifth embodiment of the present invention is different from the fourth embodiment in that: to determine the optimal size of the spiral tube, an orthogonal test method is adopted to take the outer diameter C1, the pipe diameter C2 and the pitch C3 of the spiral tube as influencing factors, which are respectively defined as A, B, C, and three levels are used for each factor.
TABLE 2 factor level Table
Simulation using ADINA software resulted in the heat exchange amplification efficiency (η) at three factors and three levels as shown in the following table:
TABLE 3 three-factor three-level orthogonal analysis Table
It can be seen from Table 3 that the optimum combination is obtained when the outside diameter C1 is 2.5cm, the pipe diameter C2 is 1.0cm, and the pitch C3 is 4cm, and the simulation value of the heat exchange amplification efficiency at this time is 4.4%.
The rest of the structure is the same as that of embodiment 4.
Example 6
Referring to fig. 6 to 7, a sixth embodiment of the present invention is different from the fifth embodiment in that: the effective thickness h of the dry hot rock is 40m, and the middle temperature Td of the dry hot rock is 230 ℃. And (3) developing a regular well pattern, wherein the bottom hole temperature is 100 ℃, and the outer diameter A1 of the base is 20cm. The heat conductivity kr of the dry heat rock is 0.8 w/(m.DEG C), the heat conductivity kw of water is 0.59 w/(m.DEG C), and the heat conductivity km of the metal of the device is 372 w/(m.DEG C). The hole distance A2 is respectively designed to be 4-8 cm, 8-13 cm, 13-17 cm, 17-20 cm and is taken as a section, the well distance A3 is taken as a section, 100-300 m, 300-500 m, 500-700 m, 700-900 m and 900-1100 m, ADINA software is used for simulation by combining the parameters, the simulation results are shown in table 4, and the influence rule of specific hole distances and well distances on the heat exchange efficiency amplification of the device is shown in fig. 10.
Table 4 heat exchange efficiency increases under several typical parameter schemes
The highest value of the heat exchange amplification efficiency is determined to be 20cm at the outer diameter A1 of the base, 17cm at the aperture A2 of the base and 530m at the well spacing A3, so that the best amplification is obtained, the heat exchange amplification efficiency is 11.3532%, and in the embodiment, when the well spacing A3 is 530m, the heat exchange amplification efficiency is rapidly reduced when the aperture A2 of the base exceeds 17.2 cm. As shown in fig. 11. The rest of the structure is the same as that of example 5.
The rest of the structure is the same as that of example 5.
Example 7
Referring to fig. 1 to 11, the heat exchange base 100 of the present invention has a relatively large weight, and if the assembled heat exchange base 100 and fluid connection rod 200 are connected to an oil pipe and then directly lowered into a rock face at the bottom of the well, there is a possibility that the oil pipe is damaged during the lowering process, so that after the completion of a dry-hot rock casing, it is first necessary to use a steel wire to lower the heat exchange base 100 into the rock face at the bottom of the well.
The heat exchange base 100 adopts a plurality of groups of complex spiral line channel structures, so that the weight of the base device is reduced while the fluid contact area is increased, and the heat exchange base has good advantages for salvaging and taking out the base of the device, and is beneficial to recovery and reuse of the device.
The device adopts the detachable buckle principle to connect the heat-insulating oil pipe and the device base, can realize the sealing effect at the bottom of the well by pressing down the pipe column under the gravity, and avoids using a threaded interface for sealing. For a metal pipe column with the length of several kilometers, the operation cost for realizing thread sealing in wellhead rotation operation is saved, and the operation safety environment of the pipe column is ensured.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. A single well dry hot rock injection fluid heat transfer enhancement device which is characterized in that: comprising the steps of (a) a step of,
the heat exchange base (100) is arranged in the dry-hot rock heat exchange well (A) and comprises a fluid injection annular table (101), a fluid extraction table (102) arranged on the inner side of the fluid injection annular table (101), and a connecting rod mounting groove (103) is formed between the fluid injection annular table (101) and the fluid extraction table (102);
the fluid connecting rod (200) is arranged in the connecting rod mounting groove (103) in a matching way, is divided into a fluid guide end (201) connected with the connecting rod mounting groove (103), and is extended to a heat insulation pipeline connecting end (202) outside the heat exchange base (100); the method comprises the steps of,
the spiral ring pipe (300) is arranged inside the heat exchange base (100), comprises a fluid injection opening (301) connected with the fluid injection ring table (101), a fluid extraction opening (302) connected with the fluid extraction table (102), and a heat exchange pipe body (303) connected with the fluid injection opening (301) and the fluid extraction opening (302).
2. The single well dry hot rock injection fluid heat exchange enhancement device of claim 1, wherein: the fluid injection annular table (101) is provided with a fluid injection port (101 a) matched with the fluid injection port (301), and the fluid extraction table (102) is provided with a fluid extraction port (102 a) matched with the fluid extraction port (302) in a penetrating way.
3. The Shan Jinggan hot rock injection fluid heat exchange enhancement device of claim 2, wherein: and one end, far away from the liquid collecting port (102 a), of the connecting rod mounting groove (103) is provided with a positioning groove (103 a), and the fluid guide end (201) is far away from the heat insulation pipeline connecting end (202) and is provided with a clamping piece (201 a) matched with the positioning groove (103 a).
4. A single well dry hot rock injection fluid heat exchange enhancement device according to claim 3, wherein: the straight line distance of the geometric center position of the fluid extraction platform (102) pointing to the outer side edge of the fluid injection annular platform (101) is the outer diameter (A1) of the base, the distance of the fluid injection port (101 a) pointing to the fluid extraction port (102 a) is the aperture (A2) of the base, and a well distance (A3) is formed between adjacent dry and hot rock heat exchange wells (A).
5. The single well dry hot rock injection fluid heat exchange enhancement device of claim 4, wherein: the outer diameter (A1) of the base is 20cm, the aperture (A2) of the base is 17cm, and the well distance (A3) is 530m.
6. The single well dry hot rock injection fluid heat exchange enhancement device of claim 5, wherein: the heat exchange tube body (303) comprises a single spiral tube body (303 a) with the same multi-section structure, and the single spiral tube body (303 a) is provided with a first tube orifice (303 a-1) and a second tube orifice (303 a-2) which are communicated with each other.
7. The single well dry hot rock injection fluid heat exchange enhancement device of claim 6, wherein: the radial pipe diameter of the first pipe orifice (303 a-1) is a pipe body caliber (C1), the spiral inner diameter of the single spiral pipe body (303 a) is a spiral diameter (C2), and the straight line distance between the first pipe orifice (303 a-1) and the second pipe orifice (303 a-2) in the direction parallel to the axis of the single spiral pipe body (303 a) is a screw pitch (C3).
8. The single well dry hot rock injection fluid heat exchange enhancement device of claim 7, wherein: the caliber (C1) of the pipe body is 2.5cm, the spiral diameter (C2) is 1.0cm, and the thread pitch (C3) is 4cm.
9. An operation method of a single-well dry hot rock injection fluid heat exchange enhancement device is characterized by comprising the following steps of: a single well dry hot rock injection fluid heat exchange enhancement device according to any one of claims 3-8.
10. The method of operating a single well dry hot rock injection fluid heat exchange enhancement device of claim 9, wherein: the method comprises the following operation steps:
after the completion of the dry-hot rock casing, the heat exchange base (100) is lowered into the rock surface at the bottom of the dry-hot rock heat exchange well (A) by using a steel wire;
connecting the fluid connection rod (200) with a heat insulation oil pipe, then lowering the heat insulation oil pipe connected with the fluid connection rod (200) into a shaft to the upper surface of the heat exchange base (100), and realizing the sealing connection of the clamping piece (201 a) and the positioning groove (103 a) in a gravity pressing mode;
fluid is injected from the annular space of the heat-insulating oil pipe and the sleeve pipe at the wellhead, the injected fluid flows in from the fluid injection annular table (101) of the heat exchange base (100) and flows through a spiral annular pipe (300) runner arranged in the heat exchange base (100) to enable the fluid to perform sufficient heat exchange with the rock mass, then flows into the inner cavity of the fluid connecting rod (200) from the fluid extraction table (102) of the heat exchange base (100), and finally hot water is extracted from the heat-insulating oil pipe at the wellhead.
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| US5816314A (en) * | 1995-09-19 | 1998-10-06 | Wiggs; B. Ryland | Geothermal heat exchange unit |
| JP2014025688A (en) * | 2012-07-30 | 2014-02-06 | Just Thokai:Kk | Heat exchange unit |
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| CN106968601A (en) * | 2017-04-14 | 2017-07-21 | 中国石油大学(华东) | Exploit the casing programme and method of dry-hot-rock geothermal resource |
| CN213480633U (en) * | 2020-09-09 | 2021-06-18 | 山西泰杰地能干热岩有限公司 | Hot dry rock heat transfer device |
| CN113124579A (en) * | 2021-05-28 | 2021-07-16 | 陕西延长石油（集团）有限责任公司 | Non-interference underground heat exchanger for changing abandoned well into geothermal well |
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Patent Citations (6)
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| US5816314A (en) * | 1995-09-19 | 1998-10-06 | Wiggs; B. Ryland | Geothermal heat exchange unit |
| JP2014025688A (en) * | 2012-07-30 | 2014-02-06 | Just Thokai:Kk | Heat exchange unit |
| CN105909214A (en) * | 2016-04-14 | 2016-08-31 | 中国石油大学(华东) | Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure |
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