CN108332440A - A kind of enhanced heat-exchange system of mid-deep strata geothermal ground and heat-exchange method - Google Patents
A kind of enhanced heat-exchange system of mid-deep strata geothermal ground and heat-exchange method Download PDFInfo
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- CN108332440A CN108332440A CN201810237436.0A CN201810237436A CN108332440A CN 108332440 A CN108332440 A CN 108332440A CN 201810237436 A CN201810237436 A CN 201810237436A CN 108332440 A CN108332440 A CN 108332440A
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- heat
- heat exchanger
- outer tube
- inner tube
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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
A kind of mid-deep strata ground thermal-enhanced underground heat exchange system and heat-exchange method, heat-exchange system include positioned at the inner tube on soaking zone stratum, outer tube and the heat exchanger positioned at heat exchanging segment stratum, artificial flash heat transfer channel, artificial flash heat transfer channel by inserted in crack high thermal conductivity coefficient concrete support dosage form at.Cylindrical elastomeric metal fin is uniformly installed, the length of metal fin is slightly larger than the annular gap between hot device outer tube and inner tube of heat exchanger, to ensure that metal fin comes into full contact with hole wall on the outside of heat exchanger outer tube.Plug is mounted on the bottom end of heat exchange outer tube, seals heat exchanger.Circulatory mediator is transported to heat exchanger by inner tube, then returns to ground by the annular gap between inner tube and outer tube, and ground can be collected by the heat exchange action geothermal of heat exchanger.The present invention can dramatically increase effective heat range of heat of underground heat rock mass, improve the heat transfer rate of heat exchanger and stratum, have the advantages that efficient, economic, green.
Description
Technical field
This bright underground heat that is related to exploits field more particularly to a kind of enhanced heat-exchange system of mid-deep strata geothermal ground and heat exchange side
Method.
Background technology
Mid-deep strata geothermal energy temperature is 25 DEG C -150 DEG C, and buried depth is generally less than 3000m, and the geothermal energy resources content of storage is huge
Greatly, exploration prospect is optimistic.But the thermal coefficient of underground 2000-3000 meters of closely knit rock mass is relatively low (1.8-2.1W/ (m.K)),
In mid-deep strata underground heat recovery process, take the thermal efficiency low, the temperature of geothermal well surrounding rock body can simultaneously decline year by year, after exploiting for many years,
Subterranean body will appear low temperature funnelling phenomenon, seriously affect the using effect of geothermal well.Currently used in mid-deep strata geothermal well
Heat-exchanger rig is generally dual-tubes heat exchanger, by heat exchanger outer tube be arranged plate-shaped fins, increase in outer tube inner tube it is convex
Rib improves underground heat collecting efficiency to increase heat exchange efficiency, build the methods of accumulator tank on heat exchange stratum.Such as patent：《Strengthen
The underground deep layer heat-exchange system of heat exchange》、《Mid-deep strata underground heat bore hole heat exchanger》、《Regenerative heat exchanger in mid-deep strata geothermal well》Deng.
Existing technology is limited to the effect for taking the thermal efficiency, solving underground heat low temperature funnelling phenomenon for improving geothermal well, and urgent need separately wards off new think of
Road solves the problem.
Hydraulic fracturing technology is a kind of construction means of maturation, deep stratum can be formed over long distances, on a large scale in underground
Crackle system.And it is filled into be formed in the crack of hydraulic fracturing generation using close-graded high thermal conductivity coefficient concrete support agent and grow
Distance, large-scale efficient heat transfer channel effectively promote heat exchanger heat supply rock mass radius, improve geothermal well and adopt the thermal efficiency, solve
The underground heat heat-exchange system of low temperature funnel problem yet there are no report.
Invention content
For the purpose of the present invention aiming at problem of the existing technology, a kind of brand new ideas of design offer, new construction are suitable
The enhanced underground heat heat-exchange system in underground for the exploitation of mid-deep strata geothermal energy resources.Reach with improving heat exchange efficiency, solution mid-deep strata
There is the purpose that low temperature funnel influences underground heat production efficiency problem in thermal resource after exploiting for a long time.
A kind of enhanced heat-exchange system of mid-deep strata geothermal ground includes the inner tube positioned at soaking zone stratum, outer tube and is located at
The heat exchanger on heat exchanging segment stratum, artificial flash heat transfer channel, artificial flash heat transfer channel is first by hydraulic fracturing technology in underground rock
Crack is formed in body, then is inserted the agent of high thermal conductivity coefficient concrete support in crack and formed；
The heat exchanger is made of heat exchanger outer tube, inner tube of heat exchanger, elastic metallic fin, metal ribs, plug, is changed
Hot outer tube and heat exchange outer coaxial tube installation, centre are connected by metal ribs, and metal ribs are passed through from the middle part of inner tube, outside heat exchanger outer tube
Side is uniformly equipped with columned elastic metallic fin, and the length of elastic metallic fin is more than heat exchanger outer tube and inner tube of heat exchanger
Between annular gap, to ensure that elastic metallic fin and hole wall come into full contact with.Plug is mounted on the bottom end of heat exchange outer tube, is used for
Seal heat exchanger.
The inner and outer tubes are co-axially mounted, and inner and outer tubes are linked together by screw thread and heat exchanger respectively；It follows
Ring medium is transported to heat exchanger by inner tube, then returns to ground by the annular gap between inner tube and outer tube, passes through the heat of heat exchanger
Exchange interaction geothermal can collect ground.
The heat-exchange method of the present invention includes the following steps：
(1) hydraulic fracturing method is utilized to form many cracks on geothermal well heat exchanging segment stratum, and it is mixed to pour into high thermal conductivity coefficient
Solidifying soil proppant, the agent of high thermal conductivity coefficient concrete support just forms artificial flash heat transfer after being solidified in formation fracture and pit shaft logical
Road.
(2) it utilizes drilling machine by original geothermal well drilling to completion, heat exchanger is transferred to heat exchange stratum, then transfer outer
In pipe, inner tube to geothermal well, it is installed together with heat exchanger；Fraclional well cementing technology is utilized to fix outer tube later.
(3) circulatory mediator is inputted by inner tube, after circulatory mediator reaches the heat exchanger in shaft bottom, along between inner and outer tubes
Annular gap return to ground, Will geothermal energies acquire out.
The operation principle of the present invention：
The first, present invention forms man-made fracture by using hydraulic fracturing method in underground heat rock stratum, and inserts closely knit grade
With high thermal conductivity coefficient concrete support agent, artificial flash heat transfer channel is formed, having for heat exchanger heat supply rock mass is significantly increased
Imitate radius.
Second, the present invention has been evenly distributed with cylindrical elastomeric metal fin on heat exchanger outer tube, increases heat exchanger and periphery
The contact area of the borehole wall and establish the quick conductive approach between the borehole wall and heat exchanger.Pass through both methods, Ke Yiji
It is big improve heat exchanger periphery rock mass for heat condition, promote heat exchanger adopts the thermal efficiency.
Beneficial effects of the present invention：
Present invention system is logical at quick conductive using hydraulic fracturing methods, thick grading high thermal conductivity coefficient concrete support dosage form
Road and enhancing type heat exchanger can dramatically increase effective heat range of heat of underground heat rock mass, improve heat exchanger compared with the prior art
Heat exchange efficiency, solution low temperature funnel problem with underground heat rock mass, have the advantages that efficient, economic, green.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
In figure：1- inner tubes；2- outer tubes；3- heat exchangers；The artificial flash heat transfer channels 4-；5- high thermal conductivity coefficient concrete supports
Agent；6- heat exchanger outer tubes；7- inner tube of heat exchanger；8- elastic metallic fins；9- metal ribs；10- plugs.
Specific implementation mode
Refering to Figure 1, this example includes positioned at the inner tube 1 on soaking zone stratum, outer tube 2 and positioned at heat exchanging segment stratum
Heat exchanger 3, artificial flash heat transfer channel 4, artificial flash heat transfer channel 4, which is first formed by hydraulic fracturing method in subterranean body, to be split
Seam, then insert high thermal conductivity coefficient concrete support agent 5 in crack and formed；
The heat exchanger 3 is by heat exchanger outer tube 6, inner tube of heat exchanger 7, elastic metallic fin 8, metal ribs 9, plug 10
It constituting, heat exchange outer tube 6 and heat exchange outer tube 7 are co-axially mounted, and centre is connected by metal ribs 9, and metal ribs 9 are passed through from the middle part of inner tube 7,
6 outside of heat exchanger outer tube is uniformly equipped with columned elastic metallic fin 8, and the length of elastic metallic fin 8 is more than heat exchanger
Annular gap between outer tube 6 and inner tube of heat exchanger 7, to ensure that elastic metallic fin 8 and hole wall come into full contact with.Plug 10 is installed
In the bottom end of heat exchange outer tube 6, for sealing heat exchanger 3.
The inner tube 1 and outer tube 2 is co-axially mounted, and inner tube 1 and outer tube 2 are connected to one by screw thread and heat exchanger 3 respectively
It rises；Circulatory mediator is transported to heat exchanger 3 by inner tube 1, then returns to ground by the annular gap between inner tube 1 and outer tube 2, by changing
The heat exchange action geothermal of hot device 3 can collect ground.
The implementation of the present invention includes step:
(1) hydraulic fracturing method is utilized to form many cracks on geothermal well heat exchanging segment stratum, and it is mixed to pour into high thermal conductivity coefficient
Solidifying soil proppant 5, high thermal conductivity coefficient concrete support agent 5 just form artificial flash heat transfer after being solidified in formation fracture and pit shaft
Channel 4.
(2) it utilizes drilling machine by original geothermal well drilling to completion, by the decentralization of heat exchanger 3 to heat exchange stratum, then transfers outer
In pipe 2, inner tube 1 to geothermal well, it is installed together with heat exchanger 3；Fraclional well cementing technology is utilized to fix outer tube 2 later.
(3) circulatory mediator is inputted by inner tube 1, after circulatory mediator reaches the heat exchanger 3 in shaft bottom, along inner tube 1 and outer tube 2
Between annular gap return to ground, Will geothermal energies acquire out.
Claims (3)
1. a kind of enhanced heat-exchange system of mid-deep strata geothermal ground, it is characterised in that：It include the inner tube positioned at soaking zone stratum
(1), outer tube (2) and the heat exchanger (3) positioned at heat exchanging segment stratum, artificial flash heat transfer channel (4), the heat exchanger (3) are
It is made of heat exchanger outer tube (6), inner tube of heat exchanger (7), elastic metallic fin (8), metal ribs (9), plug (10), exchange heat outer tube
(6) it is co-axially mounted with heat exchange outer tube (7), intermediate to be connected by metal ribs (9), metal ribs (9) are passed through from the middle part of inner tube (7), changed
Columned elastic metallic fin (8) is uniformly installed, the length of elastic metallic fin (8), which is more than, changes on the outside of hot device outer tube (6)
Annular gap between hot device outer tube (6) and inner tube of heat exchanger (7), to ensure that elastic metallic fin (8) comes into full contact with hole wall；
Plug (10) is mounted on the bottom end of heat exchange outer tube (6), for sealing heat exchanger (3)；
The inner tube (1) and outer tube (2) is co-axially mounted, and inner tube (1) and outer tube (2) are connected by screw thread and heat exchanger (3) respectively
It is connected together；Circulatory mediator is transported to heat exchanger (3) by inner tube (1), then by the annular gap between inner tube (1) and outer tube (2)
Ground is returned to, ground can be collected by the heat exchange action geothermal of heat exchanger (3).
2. a kind of enhanced heat-exchange system of mid-deep strata geothermal ground according to claim 1, it is characterised in that：The people
It is crack to be formed in subterranean body by hydraulic fracturing method, then high heat conduction system is inserted in crack to make flash heat transfer channel (4)
It counts concrete support agent (5) and is formed.
3. the heat-exchange method of the enhanced heat-exchange system of mid-deep strata geothermal ground, this method include following described in a kind of claim 1
Step：
(1) it utilizes hydraulic fracturing method to form many cracks on geothermal well heat exchanging segment stratum, and pours into high thermal conductivity coefficient concrete
Proppant (5), high thermal conductivity coefficient concrete support agent (5) just form artificial flash heat transfer after being solidified in formation fracture and pit shaft
Channel (4)；
(2) it utilizes drilling machine by original geothermal well drilling to completion, by heat exchanger (3) decentralization to heat exchange stratum, then transfers outer tube
(2), it in inner tube (1) to geothermal well, is installed together with heat exchanger (3)；Fraclional well cementing technology is utilized to fix outer tube (2) later；
(3) circulatory mediator is inputted by inner tube (1), after circulatory mediator reaches the heat exchanger (3) in shaft bottom, along inner tube (1) and outer tube
(2) annular gap between returns to ground, and Will geothermal energies acquire out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810237436.0A CN108332440A (en) | 2018-03-22 | 2018-03-22 | A kind of enhanced heat-exchange system of mid-deep strata geothermal ground and heat-exchange method |
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| CN201810237436.0A CN108332440A (en) | 2018-03-22 | 2018-03-22 | A kind of enhanced heat-exchange system of mid-deep strata geothermal ground and heat-exchange method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109403917A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | The technique for improving geothermal well Thermogenesis |
| CN109405607A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | Spiral plate type condensation segment gravity heat pipe heat exchanger |
| CN109458167A (en) * | 2018-12-05 | 2019-03-12 | 田振林 | Technique is led in the increasing of geothermal well pressure break |
| CN109724277A (en) * | 2019-03-01 | 2019-05-07 | 河北地质大学 | Geothermal well heat-exchanger rig |
| CN109779529A (en) * | 2019-01-03 | 2019-05-21 | 中国煤炭地质总局水文地质局 | A kind of geothermal well drill construction technique and geothermal well |
| CN109931036A (en) * | 2019-04-18 | 2019-06-25 | 田振林 | The method that underground heat and oil gas are adopted altogether in petroleum or natural gas extraction |
| CN111442549A (en) * | 2020-03-10 | 2020-07-24 | 甘肃省建材科研设计院有限责任公司 | Method for enhancing heat exchange |
| CN114543151A (en) * | 2022-01-24 | 2022-05-27 | 中国长江三峡集团有限公司 | Medium-deep geothermal heating device |
| WO2023216372A1 (en) * | 2022-05-12 | 2023-11-16 | 等熵循环(北京)新能源科技有限公司 | Medium-deep geothermal guiding pipe having combined vacuum cavities with support structure |
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| US20110232858A1 (en) * | 2010-03-25 | 2011-09-29 | Hiroaki Hara | Geothermal well using graphite as solid conductor |
| US20150122453A1 (en) * | 2013-11-06 | 2015-05-07 | Controlled Thermal Technologies Pty Ltd | Geothermal loop in-ground heat exchanger for energy extraction |
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| CN210374724U (en) * | 2019-02-19 | 2020-04-21 | 西安乐金新能源技术有限公司 | Heat exchanger in middle-deep geothermal heat exchange well |
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| US4912941A (en) * | 1987-07-22 | 1990-04-03 | Buechi Hans F | Method and apparatus for extracting and utilizing geothermal energy |
| US20110232858A1 (en) * | 2010-03-25 | 2011-09-29 | Hiroaki Hara | Geothermal well using graphite as solid conductor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109403917A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | The technique for improving geothermal well Thermogenesis |
| CN109405607A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | Spiral plate type condensation segment gravity heat pipe heat exchanger |
| CN109458167A (en) * | 2018-12-05 | 2019-03-12 | 田振林 | Technique is led in the increasing of geothermal well pressure break |
| WO2020113914A1 (en) * | 2018-12-05 | 2020-06-11 | 田振林 | Process for improving heat production capacity of geothermal well |
| CN109779529A (en) * | 2019-01-03 | 2019-05-21 | 中国煤炭地质总局水文地质局 | A kind of geothermal well drill construction technique and geothermal well |
| CN109724277A (en) * | 2019-03-01 | 2019-05-07 | 河北地质大学 | Geothermal well heat-exchanger rig |
| CN109931036A (en) * | 2019-04-18 | 2019-06-25 | 田振林 | The method that underground heat and oil gas are adopted altogether in petroleum or natural gas extraction |
| CN111442549A (en) * | 2020-03-10 | 2020-07-24 | 甘肃省建材科研设计院有限责任公司 | Method for enhancing heat exchange |
| CN114543151A (en) * | 2022-01-24 | 2022-05-27 | 中国长江三峡集团有限公司 | Medium-deep geothermal heating device |
| CN114543151B (en) * | 2022-01-24 | 2023-05-16 | 中国长江三峡集团有限公司 | Middle-deep geothermal heat supply device |
| WO2023216372A1 (en) * | 2022-05-12 | 2023-11-16 | 等熵循环(北京)新能源科技有限公司 | Medium-deep geothermal guiding pipe having combined vacuum cavities with support structure |
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