CN112815557B - A heat exchange casing device and geothermal single well system for efficiently exploiting geothermal resources - Google Patents
A heat exchange casing device and geothermal single well system for efficiently exploiting geothermal resources Download PDFInfo
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- CN112815557B CN112815557B CN202110183507.5A CN202110183507A CN112815557B CN 112815557 B CN112815557 B CN 112815557B CN 202110183507 A CN202110183507 A CN 202110183507A CN 112815557 B CN112815557 B CN 112815557B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000554 physical therapy Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010792 warming 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
本发明涉及一种高效开采地热资源的换热套管装置及地热单井系统，换热套管装置设置在目标热储层段，包括钢材套管和高效换热部件，钢材套管为主体结构，钢材套管上设有换热部件原孔位，用于安装高效换热部件；高效换热部件采用导热系数高于钢材的材料制成，与换热部件原孔位适配安装，并进行密封处理；地热单井系统包括外层的套管和内层的油管，套管与油管之间形成的环空作为注入井，油管作为采出井，套管为分段结构，其位于非目标热储层上的区段采用钢材制成的普通套管，位于目标热储层上的区段采用换热套管装置。本发明高效换热套管装置位于目标热储层区段，应用于地热资源开采时，增加换热效率，提高地热资源的利用率。
The present invention relates to a heat exchange casing device and a geothermal single well system for efficiently exploiting geothermal resources. The heat exchange casing device is arranged in a target heat reservoir section, and includes a steel casing and a high-efficiency heat exchange component. The steel casing is the main structure, and the steel casing is provided with an original hole position of the heat exchange component for installing the high-efficiency heat exchange component; the high-efficiency heat exchange component is made of a material with a higher thermal conductivity than steel, and is adapted to be installed in the original hole position of the heat exchange component, and is sealed; the geothermal single well system includes an outer casing and an inner oil pipe, and the annulus formed between the casing and the oil pipe is used as an injection well, and the oil pipe is used as a production well. The casing is a segmented structure, and the section located on the non-target heat reservoir adopts an ordinary casing made of steel, and the section located on the target heat reservoir adopts a heat exchange casing device. The high-efficiency heat exchange casing device of the present invention is located in the target heat reservoir section, and is applied to geothermal resource exploitation to increase heat exchange efficiency and improve the utilization rate of geothermal resources.
Description
Technical Field
The invention relates to the technical field of geothermal exploitation, in particular to a heat exchange sleeve device for efficiently exploiting geothermal resources and a geothermal single-well system.
Background
Currently, energy structures are being transformed to cleaner, lower carbon directions under the combined drive of technological advances and environmental demands. Geothermal energy, which is a green clean energy source, has been put into use as an affordable consumer energy source in many regions around the world, and exploitation of geothermal resources can reduce the problems of global warming and public health risks caused by excessive dependence on fossil fuels. Geothermal energy is a small number of renewable energy sources capable of providing continuous electricity for basal loading, plays an important role in a clean and sustainable energy system, and large-scale utilization of geothermal power generation, geothermal regional heating and the like is required to drill geothermal wells to implement controllable exploitation.
The prior geothermal exploitation technology, for example, chinese patent No. CN107144035A discloses a loop heat pipe type geothermal exploitation system with adjustable working medium circulation flow, which comprises: the device comprises a sleeve-type loop heat pipe, a surface heat exchanger, a liquid storage tank, an evaporation section, a heat insulation section, a condensation section and a reflux section; the evaporation section is positioned in the high-temperature heat storage, and the condensation section exchanges heat with the outside; working fluid of the liquid storage tank passes through the reflux section, the liquid phase reflux mode and the boiling mode of the evaporation section are controlled, and the effective liquid filling rate of the geothermal heat pipe is adjusted in real time, so that the geothermal energy is stably and efficiently extracted. The Chinese patent No. 105909214A discloses a method for exploiting dense dry hot rock geothermal heat by using self-circulation of a long horizontal well, which utilizes a single long horizontal well in a dry hot rock reservoir, and under the condition of not fracturing the dry-hot rock reservoir, adopting an annular circulating structure of an oil pipe of the dry-hot rock reservoir to carry out circulating injection and production of a heat carrying medium, thereby carrying out geothermal exploitation. Chinese patent No. CN207991010U discloses a high flow geothermal exploitation device based on thermal reservoir bedrock reservoir property, which comprises: the device comprises a geothermal collection pipeline, a geothermal storage device, two geothermal transmission pipelines, a heat storage tank, a heat exchange pump, a heat exchange liquid exchange device and a mounting rod; the outside of the heat storage tank is provided with a temperature detector, so that heat loss can be reduced in the two opposite aspects of heat transmission and heat storage, and geothermal exploitation efficiency is improved.
The defects of the existing geothermal single well exploitation technology are mainly that: the heat exchange efficiency of the underground heat exchange sleeve is low. The existing geothermal single-well exploitation technology seriously ignores the problem of low heat exchange efficiency of an underground heat exchange sleeve, and the heat exchange of a geothermal well and a direct contact section of a thermal reservoir is particularly important, and for a target thermal reservoir section in a geothermal single-well system, a steel pipe with a lower heat conductivity coefficient is still adopted as a sleeve material in direct contact with the thermal reservoir at present, so that the geothermal single-well exploitation technology has the advantages of simple structure, low heat exchange coefficient, adverse heat conduction, geothermal recovery efficiency reduction, lower fluid temperature at an outlet of a exploited well and low heat utilization rate under the condition of the same power heat source.
Disclosure of Invention
The invention aims to solve the technical problem that the underground heat exchange sleeve has low heat exchange efficiency in the prior art, and provides a heat exchange sleeve device for efficiently exploiting geothermal resources and a geothermal single well system, which can greatly increase the exploitation efficiency of geothermal resources.
The technical scheme adopted by the invention for solving the technical problems is as follows:
The heat exchange sleeve device is arranged at a target thermal reservoir section and comprises a steel sleeve and a high-efficiency heat exchange component, wherein the steel sleeve is of a main structure, and a primary hole site of the heat exchange component is arranged on the steel sleeve and is used for installing the high-efficiency heat exchange component; the high-efficiency heat exchange component is made of a material with a heat conductivity higher than that of steel, is installed in an adaptive manner with the original hole site of the heat exchange component, and is subjected to sealing treatment.
In the scheme, the primary hole positions of the heat exchange component are round drill holes uniformly arranged on the steel sleeve.
In the scheme, the efficient heat exchange component is arranged in the original hole of the heat exchange component in a welding mode.
In the above scheme, the bottom of heat exchange sleeve device is equipped with the bottom and cuts the connecting screw thread, and the top is equipped with the tensile connecting screw thread in top, and the bottom of last section heat exchange sleeve device cuts the connecting screw thread and is connected with the tensile connecting screw thread in top of next section heat exchange sleeve device to realize the connection of multistage heat exchange sleeve device.
In the scheme, the high-efficiency heat exchange component is made of copper, aluminum or super heat conducting materials.
Correspondingly, the invention also comprises a geothermal single well system which comprises an outer sleeve and an inner oil pipe, wherein an annulus formed between the sleeve and the oil pipe is used as an injection well, the oil pipe is used as a production well, the sleeve is of a segmented structure, a section of the sleeve positioned on a non-target thermal reservoir is a common sleeve made of steel, and a section of the sleeve positioned on the target thermal reservoir is the heat exchange sleeve device; an in-pipe packer is arranged between the heat exchange sleeve device and the oil pipe and is used for controlling fluid flow and fixing the oil pipe.
In the scheme, the common sleeve is in threaded connection with the heat exchange sleeve device; the oil pipes are of multi-section structures, and two adjacent sections of oil pipes are connected through threads.
In the scheme, the outer wall of the oil pipe is wrapped with the heat insulation layer, and the heat insulation layer is in close contact with the oil pipe.
In the scheme, the bottom of the sleeve is sealed through the artificial well, and the bottom of the oil pipe is opened.
In the scheme, the geothermal single well system further comprises a surface casing arranged on the outer ring of the casing, well cementation cement is arranged between the surface casing and the casing, and the lower end of the surface casing is sealed by arranging an external packer.
The invention has the beneficial effects that:
1. The high-efficiency heat exchange sleeve device is positioned in a target thermal reservoir zone, comprises a traditional steel sleeve and a high-efficiency heat exchange component, wherein the traditional steel sleeve is used as a main structure to ensure the overall strength, the high-efficiency heat exchange component uses common high-heat conduction materials such as alloy aluminum materials and copper materials, and the super-heat conduction materials are considered to be used after the cost is reduced, so that the heat exchange efficiency is improved and the utilization rate of geothermal resources is improved when the high-efficiency heat exchange sleeve device is applied to geothermal resource exploitation.
2. The high-efficiency heat exchange component is arranged in the original hole position of the heat exchange component in a welding mode, and is subjected to sealing treatment, so that the tightness of the sleeve is ensured.
3. The heat exchange sleeve device has the advantages that the original sleeve pipe diameter is kept unchanged, and the geothermal drilling and completion process is not affected.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the geothermal single-well system of the present invention;
FIG. 2 is an exploded view of the heat exchange sleeve assembly of the present invention;
FIG. 3 is an enlarged schematic view of a partial structure at A of the heat exchange sleeve assembly shown in FIG. 2;
fig. 4 is a schematic view of the heat exchange jacket assembly of fig. 2 in semi-section.
In the figure: 100. a geothermal single well system; 10. a sleeve; 20. an oil pipe; 30. a heat exchange sleeve device; 31. a steel sleeve; 311. the original hole site of the heat exchange component; 32. a high-efficiency heat exchange component; 33. bottom shearing connecting threads; 34. stretching the connecting threads at the top; 35. an in-pipe packer; 40. an annulus; 50. a surface layer sleeve; 60. cementing cement; 70. an external pipe packer; 80. manually setting the bottom of a well; 90. a thermal insulation layer; 200. a ground geothermal energy utilization system; 201. a circulation pump; 202. a condenser; 203. a turbine; 204. an evaporator; 300. thermal reservoirs.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1, a geothermal single well system 100 according to one embodiment of the present invention includes an outer casing 10 and an inner tubing 20, wherein an annulus 40 formed between the casing 10 and the tubing 20 is used as an injection well, the tubing 20 is used as a production well, an outer wall of the tubing 20 is wrapped with a thermal insulation layer 90, and the thermal insulation layer 90 is in close contact with the tubing 20. The bottom of casing 10 forms an artificial bottom 80 and tubing 20 is open at the bottom after completion. The casing 10 is a segmented structure, wherein the section of the casing positioned on the non-target thermal reservoir 300 is a common casing made of steel, and the section positioned on the target thermal reservoir 300 is a heat exchange casing device 30.
As shown in fig. 2 to 4, the heat exchange sleeve device 30 comprises a steel sleeve 31 and a high-efficiency heat exchange component 32, wherein the steel sleeve 31 is of a main structure, and the strength of the sleeve 10 is ensured. The steel sleeve 31 is provided with a primary hole site 311 for installing the efficient heat exchange component 32. In order to improve the heat exchange efficiency of the underground heat exchange jacket, the high-efficiency heat exchange member 32 is made of a material having a higher heat conductivity than steel, such as copper, aluminum, or super heat conductive material. The high-efficiency heat exchange component 32 is arranged in the original hole site 311 of the heat exchange component in a welding mode, and is subjected to sealing treatment, so that the tightness of the sleeve is ensured.
The working fluid injected into the injection well passes through the heat exchange sleeve device 30, reaches the artificial well bottom 80, and flows out of the extraction well in the reverse direction. The working fluid can obtain geothermal energy from the target thermal reservoir 300 through the heat exchange sleeve device 30, the temperature of the extracted high-temperature fluid is reduced after flowing through the ground geothermal utilization system 200, then the working fluid with reduced temperature is recharged to the annulus 40 for recycling, the whole geothermal exploitation and geothermal utilization process is a closed circulation system, the technical concept of new energy environment protection is met, and the ground geothermal utilization system 200 can be a regional heating, refrigerating, thermal spring physiotherapy, agricultural utilization and industrial utilization system. In the process of flowing of the closed circulation system, the working fluid is completely isolated from the thermal reservoir 300, so that the problems of pipeline blockage and pipeline corrosion are relieved; on the other hand, compared with the traditional heat exchange sleeve device, the heat exchange capability of the heat exchange sleeve device 30 is improved, and under the condition of the heat source of the equal-power thermal reservoir 300, the temperature of working fluid extracted from the extraction well is greatly improved, so that the geothermal energy utilization rate is increased.
The liquid outlet of the extraction well of the geothermal single-well system 100 is communicated with the liquid inlet of the evaporator 204, and the heat of the circulating working medium is brought to the turbine 203 through the evaporator 204; the liquid outlet of the evaporator 204 is communicated with the liquid inlet of the injection well of the geothermal single-well system 100, so that the working fluid is refilled into the geothermal single-well system 100 for recycling, and is completely isolated from the ground circulating water, and the corrosion damage of the ground circulating water to the geothermal single-well system 100 caused by mixing in is reduced. The ground geothermal utilization system 200 comprises a turbine 203, a condenser 202, a circulating pump 201 and an evaporator 204, wherein after flowing through the evaporator 204, ground circulating water carries heat energy to become a gas-water mixture, the turbine 203 is driven to work to generate electric energy, the ground circulating water flowing through the turbine 203 is further cooled in the condenser 202, and is pumped into the evaporator 204 again under the pushing of the pump pressure of the circulating pump 201 to form a circulating loop.
Further preferably, in this embodiment, the bottom of the heat exchange sleeve device 30 is provided with a bottom shearing connection thread 33, the top is provided with a top stretching connection thread 34, and the bottom shearing connection thread 33 of the previous section of heat exchange sleeve device 30 is connected with the top stretching connection thread 34 of the next section of heat exchange sleeve device 30, so as to realize connection of the multi-section heat exchange sleeve device 30.
Further preferably, in this embodiment, a threaded connection is adopted between the common sleeve and the heat exchange sleeve device 30.
Further preferably, in this embodiment, the primary holes 311 of the heat exchange component are circular holes uniformly arranged on the steel sleeve 31.
Further preferably, in this embodiment, an in-pipe packer 35 is provided between the heat exchange sleeve device 30 and the oil pipe 20 for controlling the flow of fluid and fixing the oil pipe 20.
Further preferably, in this embodiment, the oil pipes 20 are of a multi-section structure, and two adjacent sections of oil pipes 20 are connected by threads.
Further preferably, in the present embodiment, the geothermal single-well system 100 further includes a surface casing 50 disposed on an outer ring of the casing, the well cementation cement 60 is disposed between the surface casing 50 and the casing 10, and the lower end of the surface casing 50 is sealed by setting an external packer 70. The surface casing 50, cement 60, and external packer 70 function to ensure that the wellbore does not collapse during completion.
Further preferably, in the present embodiment, the geothermal single-well system may be a vertical geothermal well (fig. 1), or a horizontal geothermal well, or a geothermal well pattern.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (8)
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| CN113883735A (en) * | 2021-09-29 | 2022-01-04 | 万江新能源集团有限公司 | Deep well heat exchange heat pump system utilizing working medium phase change heat absorption |
| CN118376014B (en) * | 2024-04-07 | 2024-11-08 | 中国长江三峡集团有限公司 | Long-distance sleeve type geothermal energy development device based on carbon dioxide working medium |
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| CN207963217U (en) * | 2017-12-01 | 2018-10-12 | 西安交通大学 | Wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy |
| CN208901664U (en) * | 2018-08-20 | 2019-05-24 | 中国石油化工集团公司 | Geothermal well system based on single-well injection-production exploitation of geothermal energy |
| CN109403917B (en) * | 2018-12-05 | 2023-07-11 | 田振林 | Process for improving geothermal well heat production capacity |
| CN111609574B (en) * | 2019-02-25 | 2025-01-17 | 国家电投集团科学技术研究院有限公司 | Sustainable use cross-season geothermal energy development system |
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