CN111365871A - Enhanced deep well heat exchanger - Google Patents
Enhanced deep well heat exchanger Download PDFInfo
- Publication number
- CN111365871A CN111365871A CN202010120493.8A CN202010120493A CN111365871A CN 111365871 A CN111365871 A CN 111365871A CN 202010120493 A CN202010120493 A CN 202010120493A CN 111365871 A CN111365871 A CN 111365871A
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- Prior art keywords
- well
- heat
- pipe
- heat exchanger
- composite
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- 238000005553 drilling Methods 0.000 claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 9
- 238000013329 compounding Methods 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
Images
Classifications
-
- 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
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Sustainable Energy (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Sustainable Development (AREA)
- Hydrology & Water Resources (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an enhanced deep well heat exchanger which comprises a well, and rocks, a leakage layer and a low-yield layer which are arranged outside the well, wherein the well comprises a heat insulation pipe, a well pipe and a cement ring coated outside the well pipe, the heat insulation pipe is arranged inside the well pipe, a production channel is formed in the inner space of the heat insulation pipe, an injection channel is formed in the space between the heat insulation pipe and the well pipe, the production channel is communicated with the injection channel at the bottom of the well, and the injection channel obtains heat from the rocks through the well pipe and the cement ring. According to the invention, the drilling fluid with high heat conductivity is leaked into the stratum, so that the heat conductivity of the stratum is improved, and the high-performance heat-conducting channel is embedded between the well pipe and the stratum, so that the single well output is improved; meanwhile, the method is easy to implement, the leakage of the drilling fluid is easy to control by adjusting the density, viscosity and back pressure of the drilling fluid, and the combination of cement and graphene and the combination of a well pipe and graphene are not difficult to achieve.
Description
Technical Field
The invention relates to the technical field of geothermal heating, in particular to an enhanced deep well heat exchanger.
Background
The geothermal resources in China are abundant in reserves but are not uniformly distributed. Some places have poor geothermal resources, a single well has low water yield and high geothermal development cost. Aiming at the current situations of poor geothermal resources and low water yield of a single well, a deep well heat exchanger (DBHE) technology is newly developed at present, and the technology adopts a coaxial sleeve structure, takes heat from rocks through a metal outer wall and outputs the heat through an inner heat insulation pipe. Because the system is in closed circulation, underground hot water is not adopted, the problems of corrosion, scaling, no recharging and the like are solved, and the system is popular in the market. DBHE is a promising geothermal development technology, but the technology mainly depends on the heat conduction of rocks to transfer the heat of the surrounding rocks into a shaft, and the heat power of a single well is low due to the low heat conductivity coefficient of the rocks. In addition, the well drilling cost of the DBHE is high, so that the investment recovery period is long, and the large-scale popularization and application of the technology are limited. If the heat extraction power of the DBHE can be improved and the investment recovery period is reduced, the technology can be rapidly popularized. The invention provides a technology for improving heat extraction power of a DBHE single well, which is called enhanced deep well heat exchanger (EDBHE) for short, and mainly aims at a geothermal well with low productivity.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an enhanced deep well heat exchanger.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides an enhancement mode deep well heat exchanger, includes the well and at rock, the leakage layer and the low production layer in the well outside, the well includes insulating tube, well casing and the cladding cement ring in the well casing outside, the insulating tube sets up inside the well casing, and insulating tube inner space forms the extraction passageway, space between insulating tube and the well casing forms the injection channel, extraction passageway and injection channel communicate in the shaft bottom, the injection channel is passed through well casing and cement ring and is got heat to the rock.
Furthermore, the cement sheath is made of a high-thermal-conductivity material and cement in a composite mode. The heat conducting property of the well wall is enhanced by compounding the high heat conducting property material, so that the heat collecting efficiency is improved.
Further, the well pipe comprises a composite well pipe and a common oil pipe, wherein the composite well pipe is made by compounding high-heat-conductivity materials and the oil pipe, the composite well pipe is arranged in the well sections of the loss formation and the low-production formation, and the common oil pipe is adopted in the rest part.
Furthermore, the composite drilling fluid is prepared by compounding high-heat-conductivity materials and mud during drilling.
Furthermore, when the drilling meets the leakage layer, the density, viscosity and back pressure of the composite drilling fluid are adjusted, so that the composite drilling fluid leaks into the leakage layer more, and the heat conducting performance of the leakage layer is improved.
Furthermore, when the drilling meets a low-yield layer, the density, viscosity and back pressure of the composite drilling fluid are adjusted, so that the composite drilling fluid leaks into the low-yield layer more, and the heat conducting performance of the low-yield layer is improved.
Further, the high-thermal-conductivity material is made of a graphene material.
Compared with the prior art, the invention has the following advantages:
according to the invention, the drilling fluid with high heat conductivity is leaked into the stratum, so that the heat conductivity of the stratum is improved, and the high-performance heat-conducting channel is embedded between the well pipe and the stratum, so that the single well output is improved; meanwhile, the method is easy to implement, the leakage of the drilling fluid is easy to control by adjusting the density, viscosity and back pressure of the drilling fluid, and the combination of cement and graphene and the combination of a well pipe and graphene are not difficult to achieve.
Drawings
FIG. 1 is a schematic structural view of an enhanced deep well heat exchanger;
description of reference numerals: 1. a well pipe; 2. a heat preservation pipe; 3. a cement sheath; 4. a rock; 5. a leakage layer; 6. a low-yield zone; 7. a well bottom; 8. an injection channel; 9. and (4) a production channel.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
As shown in fig. 1, an enhanced deep well heat exchanger comprises a well, rocks 4 outside the well, a leakage layer 5 and a low-yield layer 6, wherein the well comprises a heat preservation pipe 2, a well pipe 1 and a cement sheath 3 coated outside the well pipe 1, the heat preservation pipe 2 is arranged inside the well pipe 1, a production passage 9 is formed in the space inside the heat preservation pipe 2, an injection passage 8 is formed in the space between the heat preservation pipe 2 and the well pipe 1, the production passage 9 is communicated with the injection passage 8 at the bottom of the well 7, the injection passage 8 extracts heat from the rocks 4 through the well pipe 1 and the cement sheath 3, the cement sheath 3 is made by compounding high-heat-conducting materials and cement, for example, the graphene and the cement are compounded, and the high-heat-conducting materials can also adopt other high-heat-conducting materials such as carbon fibers and the.
Because the heat transfer effect of the loss zone 5 and the low-production zone 6 is smaller than that of the rock 4, the well pipe 1 is improved aiming at the loss zone 5 and the low-production zone 6, the well pipe 1 comprises a composite well pipe and a common oil pipe which are made by compositing graphene and the oil pipe, the composite well pipe is arranged at the well sections of the loss zone 5 and the low-production zone 6 to enhance the heat exchange effect, and the rest part adopts the common oil pipe.
In order to further improve the heat conductivity of the thief zone 5 and the low-yield zone 6, composite drilling fluid prepared by compounding graphene and mud is adopted during drilling, and when the thief zone 5 and the low-yield zone 6 are met during drilling, the composite drilling fluid is deliberately leaked into the thief zone 5 and the low-yield zone 6 by adjusting the density, viscosity and back pressure of the composite drilling fluid, so that the heat conductivity of the thief zone 5 and the low-yield zone 6 is improved.
When the heat exchanger is used, water enters the heat exchanger through the injection channel 9, in the process of flowing from a wellhead to a shaft bottom, the rock 4, the leakage layer 5 and the low-yield layer 6 are subjected to heat absorption through the well pipe 1 and the cement sheath 3, and after the heat absorption, the water flows through the shaft bottom to enter the extraction channel 9, and the extraction channel 9 is the inner space of the heat preservation pipe 2, so that the heat can be well kept until the water is extracted from the extraction channel 9, and the heat exchange is completed.
Specifically, the construction is carried out as follows:
firstly, preparing a composite drilling fluid with high thermal conductivity: the mud drilling fluid with the mass fraction of 70% is compounded with the graphene with the mass fraction of 30% to prepare the composite drilling fluid with high thermal conductivity.
And secondly, starting drilling: the well opening section drill bit is 311.15mm, the casing pipe is 244.275mm and the depth is 200 meters, and the well opening section drill bit is mainly used for protecting shallow underground water.
Thirdly, drilling a well: 215.9mm drill bit, 177.8mm casing, target depth 3000 meters. In the drilling process, when an anhydrous leakage layer 5 or a low-yield layer 6 is encountered, the drilling fluid is intentionally leaked into the leakage layer 5 or the low-yield layer 6 by adjusting the density, viscosity and back pressure of the composite drilling fluid, so that the heat conductivity of the stratum is improved.
Fourthly, a well pipe is lowered: common oil pipes with the diameter of 177.8mm are adopted in the well sections outside the thief zone 5 and the low-producing zone 6; and in the leakage layer 5 and the low-yield layer 6, an oil pipe and graphene are compounded to form the composite well pipe with high heat conductivity.
Fifthly, preparing composite well cementation cement: ordinary well cementing cement and graphene are compounded to prepare the composite well cementing cement with high heat conductivity. The mass ratio of the common cement to the graphene is 7: 3.
sixthly, cementing the well: and (5) adopting the composite well cementation cement to perform well cementation.
Seventhly, putting a heat preservation pipe: the length of the heat preservation pipe 2 is 2995m, the diameter is 110mm, and the material is polyethylene.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (7)
1. An enhanced deep well heat exchanger comprising a well and outside the well rock (4), thief zone (5) and low producing zone (6), characterized in that: the well includes insulating tube (2), well casing (1) and cladding cement sheath (3) in well casing (1) outside, insulating tube (2) set up inside well casing (1), and insulating tube (2) inner space forms extraction passageway (9), and the space between insulating tube (2) and well casing (1) forms injection channel (8), extraction passageway (9) and injection channel (8) are in shaft bottom (7) intercommunication, injection channel (8) are got heat to rock (4) through well casing (1) and cement sheath (3).
2. The enhanced deep well heat exchanger of claim 1, wherein: the cement sheath (3) is made by compounding a high-heat-conducting material and cement.
3. The enhanced deep well heat exchanger of claim 1, wherein: the well pipe (1) comprises a composite well pipe and a common oil pipe, wherein the composite well pipe is made by compounding high-heat-conductivity materials and the oil pipe, the composite well pipe is arranged in a lost circulation layer (5) and a low-production layer (6) part of well sections, and the common oil pipe is adopted in the rest part.
4. The enhanced deep well heat exchanger of claim 1, wherein: the composite drilling fluid is prepared by compounding high-heat-conductivity materials and mud during drilling.
5. The enhanced deep well heat exchanger of claim 4, wherein: when the drilling meets the leakage layer (5), the composite drilling fluid is leaked into the leakage layer (5) more by adjusting the density, viscosity and back pressure of the composite drilling fluid, so that the heat conducting property of the leakage layer (5) is improved.
6. The enhanced deep well heat exchanger of claim 5, wherein: when drilling in a low-yield layer (6), the density, viscosity and back pressure of the composite drilling fluid are adjusted, so that the composite drilling fluid is leaked into the low-yield layer (6) more, and the heat conducting property of the low-yield layer (6) is improved.
7. An enhanced deep well heat exchanger according to any of claims 2-4, wherein: the high-thermal-conductivity material is a graphene material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010120493.8A CN111365871B (en) | 2020-02-26 | 2020-02-26 | Enhanced deep well heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010120493.8A CN111365871B (en) | 2020-02-26 | 2020-02-26 | Enhanced deep well heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111365871A true CN111365871A (en) | 2020-07-03 |
| CN111365871B CN111365871B (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010120493.8A Active CN111365871B (en) | 2020-02-26 | 2020-02-26 | Enhanced deep well heat exchanger |
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| Country | Link |
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| CN (1) | CN111365871B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113587464A (en) * | 2021-06-30 | 2021-11-02 | 北京市地质工程勘察院 | Open type coaxial sleeve heat exchange system for geothermal well |
| CN114482930A (en) * | 2020-10-23 | 2022-05-13 | 中国科学院广州能源研究所 | Unconsolidated sandstone area geothermal mining method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114482930A (en) * | 2020-10-23 | 2022-05-13 | 中国科学院广州能源研究所 | Unconsolidated sandstone area geothermal mining method |
| CN113587464A (en) * | 2021-06-30 | 2021-11-02 | 北京市地质工程勘察院 | Open type coaxial sleeve heat exchange system for geothermal well |
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| Publication number | Publication date |
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| CN111365871B (en) | 2021-08-31 |
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