CN112815557A - Heat exchange sleeve device for efficiently exploiting geothermal resources and geothermal single well system - Google Patents
Heat exchange sleeve device for efficiently exploiting geothermal resources and geothermal single well system Download PDFInfo
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- CN112815557A CN112815557A CN202110183507.5A CN202110183507A CN112815557A CN 112815557 A CN112815557 A CN 112815557A CN 202110183507 A CN202110183507 A CN 202110183507A CN 112815557 A CN112815557 A CN 112815557A
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- heat exchange
- casing
- geothermal
- sleeve device
- sleeve
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to a heat exchange sleeve device for efficiently exploiting geothermal resources and a geothermal single well system, wherein the heat exchange sleeve device is arranged at a target heat storage layer section and comprises a steel sleeve and an efficient heat exchange part, the steel sleeve is of a main structure, and the steel sleeve is provided with an original hole position of the heat exchange part and used for installing the efficient heat exchange part; the high-efficiency heat exchange part is made of a material with a heat conductivity coefficient higher than that of steel, is installed in a manner of being matched with the original hole position of the heat exchange part, and is subjected to sealing treatment; the geothermal single well system comprises an outer casing and an inner oil pipe, wherein an annular space formed between the casing and the oil pipe is used as an injection well, the oil pipe is used as a production well, the casing is of a segmented structure, a section of the casing, which is positioned on a non-target thermal reservoir, adopts a common casing made of steel, and a section of the casing, which is positioned on a target thermal reservoir, adopts a heat exchange casing device. The high-efficiency heat exchange casing device is positioned in a target heat reservoir section, and when the high-efficiency heat exchange casing device is applied to exploitation of geothermal resources, the heat exchange efficiency is increased, and the utilization rate of the geothermal resources is improved.
Description
Technical Field
The invention relates to the technical field of geothermal exploitation, in particular to a heat exchange casing device for efficiently exploiting geothermal resources and a geothermal single-well system.
Background
Currently, driven by the development of technology and environmental demands, energy structures are being transformed to cleaner and lower carbon. Geothermal energy is used as green clean energy and is already put into use as an affordable consumption energy in many regions of 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 few renewable energy sources capable of providing continuous base load power, and plays an important role in a clean and sustainable energy system, and the scale utilization of geothermal power generation, geothermal district heating and the like needs to be drilled into a geothermal well to implement controllable exploitation.
Among them, the existing geothermal exploitation technology, for example, chinese invention patent CN107144035A discloses a loop heat pipe type geothermal exploitation system with adjustable working medium circulation flow, which includes: the system comprises a sleeve-type loop heat pipe, a ground 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 medium fluid of the liquid storage tank passes through the reflux section, controls a liquid phase reflux mode and a boiling mode of the evaporation section, and adjusts the effective liquid filling rate of the geothermal heat pipe in real time, so that the geothermal energy is stably and efficiently extracted. The Chinese invention patent CN105909214A discloses a method for exploiting compact dry hot rock geothermal energy by utilizing self-circulation of a long horizontal well, which utilizes a single-opening long horizontal well in a dry hot rock reservoir to carry out circulating injection and exploitation of a heat-carrying medium by adopting an annular circulation structure of an oil pipe under the condition of not fracturing the dry hot rock reservoir, thereby carrying out geothermal exploitation. Chinese utility model patent CN207991010U discloses a large-traffic geothermol power exploitation equipment based on heat storage base rock stratum reservoir performance, it includes: the system comprises a geothermal collecting pipeline, a geothermal storage device, two geothermal transmission pipelines, a heat storage pool, a heat exchange pump, a heat exchange liquid replacing device and an installation rod; the heat-retaining pond outside is provided with the temperature-detecting meter, can reduce the loss of heat in two anti-aspects of thermal transmission and storage, improves geothermal exploitation efficiency.
The defects of the existing geothermal single-well exploitation technology are mainly as follows: the heat exchange efficiency of the underground heat exchange sleeve is low. The existing geothermal single-well exploitation technology seriously neglects the problem of low heat exchange efficiency of an underground heat exchange sleeve, the heat exchange of a geothermal well and a heat storage layer direct contact section is particularly important, for a target heat storage layer section in a geothermal single-well system, a steel pipe with a low heat conductivity coefficient is still adopted as a sleeve material which is in direct contact with the heat storage layer at present, the structure is simple, the heat exchange coefficient is low, heat conduction is not facilitated, the geothermal recovery efficiency is reduced, and under the condition of a heat source with the same power, the temperature of fluid at an outlet of an exploitation well is low, and the heat utilization rate is low.
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 the geothermal resources.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a heat exchange sleeve device for efficiently exploiting geothermal resources is arranged in a target heat storage layer section and comprises a steel sleeve and an efficient heat exchange part, wherein the steel sleeve is of a main structure, and an original hole of the heat exchange part is formed in the steel sleeve and used for installing the efficient heat exchange part; the high-efficiency heat exchange component is made of a material with a heat conductivity coefficient higher than that of steel, is installed in a manner of being matched with the original hole position of the heat exchange component, and is subjected to sealing treatment.
In the scheme, the original hole positions of the heat exchange components are round drilled holes which are uniformly arranged on the steel sleeve.
In the above scheme, the high-efficiency heat exchange part is installed in the original hole position of the heat exchange part in a welding mode.
In the above scheme, heat exchange sleeve device's bottom is equipped with bottom and cuts connecting thread, and the top is equipped with the tensile connecting thread in top, and last section heat exchange sleeve device's bottom is cuted connecting thread and is connected with next section heat exchange sleeve device's the tensile connecting thread in top to realize the connection of multistage heat exchange sleeve device.
In the scheme, the high-efficiency heat exchange component is made of copper materials, aluminum materials or super heat conduction materials.
Correspondingly, the invention also comprises a geothermal single well system which comprises an outer casing and an inner oil pipe, wherein an annular space formed between the casing and the oil pipe is used as an injection well, the oil pipe is used as a production well, the casing is of a segmented structure, the section of the casing positioned on a non-target thermal reservoir adopts a common casing made of steel, and the section positioned on the target thermal reservoir adopts the heat exchange casing 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 and the heat exchange sleeve device are in threaded connection; the oil pipe adopts a multi-section structure, and two adjacent sections of oil pipes are connected through threads.
In the scheme, the outer wall of the oil pipe is wrapped by the heat insulation layer, and the heat insulation layer is in close contact with the oil pipe.
In the scheme, the bottom of the casing is sealed by the artificial well, and the bottom of the oil pipe is opened.
In the above scheme, the geothermal single-well system further comprises a surface casing pipe arranged on the outer ring of the casing pipe, well cementation cement is arranged between the surface casing pipe and the casing pipe, and the lower end of the surface casing pipe is sealed by arranging an external casing packer.
The invention has the beneficial effects that:
1. the efficient heat exchange sleeve device is positioned in a target heat reservoir zone, the efficient heat exchange sleeve device comprises a traditional steel sleeve and an efficient heat exchange part, the traditional steel sleeve is used as a main body structure and can ensure the overall strength, the efficient heat exchange part is made of common high-heat-conduction materials such as alloy aluminum materials and copper materials, and the super-heat-conduction materials are considered after the cost is reduced, so that when the efficient heat exchange sleeve device is applied to exploitation of geothermal resources, the heat exchange efficiency is increased, and the utilization rate of the geothermal resources is improved.
2. The high-efficiency heat exchange part is arranged in the original hole position of the heat exchange part in a welding mode, and is sealed, so that the sealing performance of the sleeve is ensured.
3. The heat exchange casing device keeps the original casing pipe diameter unchanged, and does not influence the geothermal drilling and well completion processes.
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 construction of a geothermal single well system of the invention;
FIG. 2 is an exploded perspective view of the heat exchange jacket assembly of the present invention;
FIG. 3 is an enlarged view of a portion of the heat exchange jacket apparatus shown in FIG. 2 at A;
fig. 4 is a schematic half-section view of the heat exchange jacket apparatus of fig. 2.
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 casing; 311. the original hole position of the heat exchange part; 32. a high efficiency heat exchange component; 33. bottom shear connecting threads; 34. the top is stretched to connect the screw thread; 35. a packer inside the pipe; 40. an annulus; 50. a surface casing; 60. cementing cement; 70. an external pipe packer; 80. artificial well bottom; 90. a thermal insulation layer; 200. a ground geothermal utilization system; 201. a circulation pump; 202. a condenser; 203. a turbine; 204. an evaporator; 300. a thermal reservoir.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a geothermal single well system 100 in one embodiment of the invention comprises 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, the outer wall of the tubing 20 is wrapped with a layer of thermal insulation 90, and the thermal insulation 90 is in close contact with the tubing 20. The bottom of the casing 10 forms an artificial well bottom 80 after completion and the bottom of the tubing 20 is open. The casing 10 is a segmented structure, and the section of the casing located in the non-target thermal reservoir 300 is made of a common casing made of steel, and the section located in the target thermal reservoir 300 is made of the heat exchange casing device 30.
As shown in fig. 2-4, the heat exchange sleeve device 30 includes a steel sleeve 31 and a high-efficiency heat exchange component 32, wherein the steel sleeve 31 is a main structure, which ensures the strength of the sleeve 10. The steel sleeve 31 is provided with a heat exchange component original hole 311 for installing the high-efficiency heat exchange component 32. In order to improve the heat exchange efficiency of the underground heat exchange sleeve, the high-efficiency heat exchange component 32 is made of a material with a heat conductivity coefficient higher than that of steel, such as a copper material, an aluminum material or a super heat conduction material. The high-efficiency heat exchange part 32 is installed in the original hole 311 of the heat exchange part in a welding mode, and is sealed, so that the sealing performance of the sleeve is guaranteed.
The working fluid injected into the injection well passes through the heat exchange casing device 30 and then reaches the artificial well bottom 80, and then flows out of the production well in the reverse direction. The working medium fluid can obtain geothermal energy from the target heat reservoir layer 300 through the heat exchange sleeve device 30, the temperature of the extracted high-temperature fluid is reduced after the extracted high-temperature fluid flows through the ground geothermal utilization system 200, then the working medium fluid with the reduced temperature is recharged to the annular space 40 for recycling, the whole process of exploiting geothermal heat and utilizing geothermal heat is a closed circulating system, the technical idea of new energy source environmental protection is met, and the ground geothermal utilization system 200 can be a system for regional heating, refrigeration, hot spring physical therapy, agricultural utilization and industrial utilization. In the process that the working medium fluid flows in the closed circulation system, the working medium 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 capacity of the heat exchange sleeve device 30 is increased, and under the condition of a 300-power heat reservoir heat source, the temperature of working medium fluid produced by a production well is greatly increased, and the utilization rate of geothermal energy is increased.
A liquid outlet of a production well of the geothermal single-well system 100 is communicated with a liquid inlet of the evaporator 204, and 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 medium fluid is re-filled into the geothermal single-well system 100 for repeated cyclic utilization, and is completely isolated from the ground circulating water, thereby reducing the corrosion damage of the geothermal single-well system 100 caused by the mixing of the ground circulating water. The ground geothermal utilization system 200 comprises a turbine 203, a condenser 202, a circulating pump 201 and an evaporator 204, wherein ground circulating water flows through the evaporator 204 and then carries heat energy to become a gas-water mixture, the turbine 203 is pushed to do 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 optimize, in this embodiment, the bottom of the heat exchange sleeve device 30 is provided with a bottom shearing connecting thread 33, the top is provided with a top stretching connecting thread 34, the bottom shearing connecting thread 33 of the previous heat exchange sleeve device 30 is connected with the top stretching connecting thread 34 of the next heat exchange sleeve device 30, and therefore the connection of the multiple sections of heat exchange sleeve devices 30 is realized.
Further, in this embodiment, the common sleeve is connected to the heat exchange sleeve device 30 by a screw.
Further preferably, in this embodiment, the original hole locations 311 of the heat exchange component are round holes uniformly arranged on the steel casing 31.
Further preferably, in this embodiment, an in-pipe packer 35 is disposed between the heat exchange casing device 30 and the oil pipe 20, and is used for controlling the flow of the fluid and fixing the oil pipe 20.
Further optimize, in this embodiment, the oil pipe 20 adopts a multi-section structure, and two adjacent sections of the oil pipe 20 are connected by a thread.
Further preferably, in this embodiment, the geothermal single-well system 100 further includes a surface casing 50 disposed on an outer ring of the casing, a cementing cement 60 is disposed between the surface casing 50 and the casing 10, and a lower end of the surface casing 50 is sealed by disposing an outer packer 70. The surface casing 50, cementing 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 can be a vertical geothermal well (fig. 1), or a horizontal geothermal well, or a geothermal well pattern.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The heat exchange sleeve device for efficiently exploiting geothermal resources is characterized by being arranged in a target heat storage layer section and comprising a steel sleeve and an efficient heat exchange part, wherein the steel sleeve is of a main structure, and an original hole position of the heat exchange part is arranged on the steel sleeve and used for installing the efficient heat exchange part; the high-efficiency heat exchange component is made of a material with a heat conductivity coefficient higher than that of steel, is installed in a manner of being matched with the original hole position of the heat exchange component, and is subjected to sealing treatment.
2. The heat exchange sleeve device for efficiently exploiting geothermal resources according to claim 1, wherein the original hole sites of the heat exchange member are round holes uniformly arranged on the steel sleeve.
3. The heat exchange sleeve device for efficiently exploiting geothermal resources according to claim 1, wherein the efficient heat exchange component is installed in the original hole site of the heat exchange component by welding.
4. The heat exchange sleeve device for efficiently exploiting geothermal resources as recited in claim 1, wherein the heat exchange sleeve device is provided with bottom shearing connecting threads at the bottom and top stretching connecting threads at the top, and the bottom shearing connecting threads of the previous heat exchange sleeve device are connected with the top stretching connecting threads of the next heat exchange sleeve device, so that the connection of the multiple sections of heat exchange sleeve devices is realized.
5. The heat exchange sleeve device for efficiently exploiting a geothermal resource according to claim 1, wherein the high efficiency heat exchange member is made of a copper material, an aluminum material or a super heat conductive material.
6. A geothermal single well system, comprising an outer casing and an inner oil pipe, wherein an annular space 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 of a segmented structure, the section of the casing positioned on a non-target thermal reservoir adopts a common casing made of steel, and the section positioned on a target thermal reservoir adopts the heat exchange casing device of any one of claims 1 to 5; 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.
7. A geothermal single well system according to claim 6, wherein the common casing and the heat exchange casing means are in threaded connection; the oil pipe adopts a multi-section structure, and two adjacent sections of oil pipes are connected through threads.
8. A geothermal single well system according to claim 6, wherein the outer wall of the tubing is wrapped with a layer of insulation which is in intimate contact with the tubing.
9. A geothermal single well system according to claim 6, wherein the bottom of the casing is sealed by an artificial well and the bottom of the tubing is open.
10. The geothermal single-well system according to claim 6, further comprising a surface casing pipe arranged on the outer ring of the casing pipe, wherein well cement is arranged between the surface casing pipe and the casing pipe, and the lower end of the surface casing pipe is sealed by arranging an outer casing packer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110183507.5A CN112815557A (en) | 2021-02-08 | 2021-02-08 | Heat exchange sleeve device for efficiently exploiting geothermal resources and geothermal single well system |
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| CN202110183507.5A CN112815557A (en) | 2021-02-08 | 2021-02-08 | Heat exchange sleeve device for efficiently exploiting geothermal resources and geothermal single well system |
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| CN112815557A true CN112815557A (en) | 2021-05-18 |
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| CN202110183507.5A Pending CN112815557A (en) | 2021-02-08 | 2021-02-08 | Heat exchange sleeve device for efficiently exploiting geothermal resources and geothermal single well system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2021
- 2021-02-08 CN CN202110183507.5A patent/CN112815557A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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