CN208594924U - Develop the well pattern structure of enhanced underground heat - Google Patents
Develop the well pattern structure of enhanced underground heat Download PDFInfo
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Abstract
The utility model is a kind of well pattern structure for developing enhanced underground heat, a pair of of note of dry development area setting on hot dry rock stratum adopts horizontal well, injection well is parallel to each other and vertical with the major fracture direction of dry development area with the horizontal segment of extraction well, and the horizontal segment of two horizontal wells is in same level；Two mouthfuls of water horizontal well zip mode staged fracturings form alternating expression man-made fracture, and man-made fracture links up dry and extends, extends, and form complex fracture between Liang Koushui horizontal well and link up area；Injection device is arranged in the well head of Injection Level well, produces the well head setting extraction equipment of horizontal well, injection device and extraction equipment pass through cycle fluid feed-line respectively and is connected to a generating equipment.The utility model can greatly improve the heat exchange efficiency during enhanced geothermal exploitation between cycle fluid and hot dry rock, improve the flow and extraction temperature of injection-production well cycle fluid, well intake pressure and cycle fluid loss late are reduced, realizes the Efficient Development to enhanced geothermal energy resources.
Description
Technical field
The utility model is about the technology of a kind of enhanced underground heat Efficient Development more particularly to a kind of using dual horizontal well
Zip mode staged fracturing technique develops the well pattern structure of enhanced underground heat.
Background technique
With the continuous improvement of China's energy resource structure transition and environmental requirement, development is efficient, cleans, the renewable energy of low-carbon
Source has become inexorable trend.The stock number of enhanced underground heat (Enhanced Geothermal Systems, EGS) is much larger than
Geothermal resource of hydrothermal type and have the characteristics that widely distributed, stability is high, is the hot spot of current various countries' energy research.It is enhanced
The research object of the development of resources of underground heat is hot dry rock (Hot Dry Rock, HDR), refers to and is imbedded in 3~10Km of underground, temperature
Degree is at 180~650 DEG C, and containing a small amount of water or water-free rock, the country such as the U.S., Germany, France, Iceland is all to enhanced
Geothermal energy resources have carried out demonstration project and have partially realized commercialization, and the development technology of present mainstream is by two mouthfuls of vertical well fractures
Realize that crack is linked up, and injects after water at low temperature after hot dry rock exchanges heat, by high-temperature water from another mouthful of straight well from a bite straight well afterwards
Extraction power generation.This double vertical well fractures note method of adopting has the disadvantages that crack links up that area is small to be caused to exchange heat insufficient, and straight well is split
Seam docking difficulty causes greatly crack to be linked up to be not thorough, and note adopts water and recharge rate is low causes generating capacity limited, and problem above is tight
The commercialized process of enhanced underground heat is constrained again, how to improve enhanced geothermal exploitation technique, realizes hot dry rock and takes thermal technology
The high efficient heat exchanging of matter becomes key technology difficulty urgently to be resolved at present.
The present inventor based on years of experience and practice in relevant industries, proposes a kind of enhanced underground heat of exploitation as a result,
Well pattern structure, to overcome the deficiencies of existing technologies.
Utility model content
The purpose of this utility model is to provide a kind of well pattern structures for developing enhanced underground heat, existing enhanced to solve
Crack communication is difficult in underground heat routine exploitation, heat exchange is insufficient, infuses the problem of adopting flow and recharge low efficiency.
The purpose of this utility model is achieved in that a kind of well pattern structure for developing enhanced underground heat, in hot dry rock
A pair of of note of dry development area setting of layer adopts horizontal well, injection well be parallel to each other with the horizontal segment for producing well and with split naturally
The major fracture direction for stitching development area is vertical, and the horizontal segment of two horizontal wells is in same level；Two mouthfuls of water horizontal well zip modes
Staged fracturing forms alternating expression man-made fracture, and man-made fracture links up dry and extends, extends, formed between Liang Koushui horizontal well
Complex fracture links up area；Injection device is arranged in the well head of Injection Level well, produces the well head setting extraction equipment of horizontal well, described
Injection device and extraction equipment pass through cycle fluid feed-line respectively and are connected to a generating equipment.
In a better embodiment of the utility model, on the horizontal segment of two horizontal wells is located in hot dry rock stratum
Position, the man-made fracture length of the spacing of the horizontal segment of two horizontal wells greater than one times and the man-made fracture length less than twice.
In a better embodiment of the utility model, it is the three well bore knots for opening cased hole completion that a pair of note, which adopts horizontal well,
Structure；One spud in into bit diameter be greater than 400mm, two spud in into bit diameter be greater than 300mm, three spud in into bit diameter
Greater than 200mm；One ends brill layer casing and the well cementation of G class g cement；Two end the lower protective casing of brill, and simultaneously G class g cement is cemented the well, and three
End the lower production casing of brill and the well cementation of G class g cement；Two end bore layer position should more than hot dry rock top layer 50~70m；Three water opened
Flat section is located in hot dry rock, and horizontal section length is 1000~2000m；The thermal coefficient of production casing is greater than 100w/ (m.k), G
The thermal coefficient of grade cementing concrete is greater than 20w/ (m.k).
In a better embodiment of the utility model, the number of segment of two mouthfuls of water horizontal well zip mode staged fracturings is 5~9
Section；Preforation tunnel is Spiral distribution, and preforation tunnel spacing is 0.05~0.2m, and the phase angle of preforation tunnel is 45~60 °；Manually
Fracture length is 50~100m, is in mutually stagger state between two mouthfuls of water horizontal well fracturing fractures, two mouthfuls of water horizontal wells are adjacent manually to be split
The spacing of seam is 50~200m.
In a better embodiment of the utility model, being equipped in cycle fluid feed-line can be in the communication area of crack
The cycle fluid sufficiently to be exchanged heat between hot dry rock, the cycle fluid are clear water or critical carbon dioxide.
In a better embodiment of the utility model, injection well is parallel with extraction well drilling well orientation, the brill of two mouthfuls of wells
Well gun parallax is 0 ° or 180 °.
In a better embodiment of the utility model, the fracturing fluid of two mouthfuls of water horizontal well zip mode staged fracturings is clear water
Middle addition appropriate amount of quartz sand is constituted.
From the above mentioned, the utility model develops the well pattern structure of enhanced underground heat, can greatly improve enhanced underground heat
Heat exchange efficiency in development process between cycle fluid and hot dry rock improves the flow and extraction temperature of injection-production well cycle fluid, drop
Low well intake pressure and cycle fluid loss late realize the Efficient Development to enhanced geothermal energy resources.The tool of the utility model
Body has the beneficial effect that the well pattern structure safety and environmental protection of the enhanced underground heat of (1) exploitation, is discharged without waste liquid (slag), and cycle fluid can
With recycling.(2) compared with existing straight well, horizontal well considerably increases the communication range of pit shaft and dry, increases
Hot dry rock heat exchange area.(3) man-made fracture of alternating expression, man-made fracture are formed by dual horizontal well zip mode staged fracturing technique
It communicates with each other to form complicated crack communication area between dry, the abundant heat exchange between cycle fluid and hot dry rock provides
Channel.(4) well pattern structure of the enhanced underground heat of the exploitation increases circulation under the premise of guaranteeing cycle fluid outlet temperature
The flow of working medium can increase generated output.(5) dual horizontal well zip mode staged fracturing technique substantially increases two cracks Kou Jing
The success rate of communication can be improved primary connection success rate, reduces and subsequent remedies construction operation.
Detailed description of the invention
Following drawings are only intended to schematically illustrate and explain the present invention, does not limit the model of the utility model
It encloses.Wherein:
Fig. 1: the well pattern structure schematic diagram of enhanced underground heat is developed for the utility model.
Fig. 2: for technique stream of the well pattern structure to enhanced geothermal exploitation for developing enhanced underground heat using the utility model
Journey schematic diagram.
Drawing reference numeral:
100, the well pattern structure of enhanced underground heat is developed；
1, injection well；
11, injection well surface pipe；
12, injection well protective casing；
13, injection well production casing；
15, injection well man-made fracture；
2, well is produced；
21, well surface pipe is produced；
22, well protective casing is produced；
23, well production casing is produced；
25, well man-made fracture is produced；
3, complex fracture links up area；
4, injection device；
5, equipment is produced；
6, generating equipment；
7, cycle fluid feed-line；
9, hot dry rock stratum.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, the utility model proposes a kind of well pattern structures 100 for developing enhanced underground heat, on hot dry rock stratum 9
A pair of of note of dry development area setting adopt horizontal well, dry described in present embodiment refers to nature vertical fissure
Seam, injection well 1 is parallel to each other with the horizontal segment of extraction well 2 and, two water vertical with the major fracture direction of dry development area
The horizontal segment of horizontal well is in same level；Two mouthfuls of water horizontal well zip mode staged fracturings form alternating expression injection well man-made fracture
15 link up dry and simultaneously extend, extend with extraction well man-made fracture 25, man-made fracture, are formed between Liang Koushui horizontal well complicated
Crack communication area 3；The well head of Injection Level well is provided with injection device 4, and the well head for producing horizontal well is provided with extraction equipment 5,
The injection device 4 and extraction equipment 5 are connected to a generating equipment 6 by cycle fluid feed-line 7 respectively.
The utility model also proposes a kind of technique for developing enhanced underground heat, as shown in Fig. 2, the specific steps of which are as follows:
Step (1): determining horizontal well orientation, and that completes injection-production well is drilled well, FRACTURING DESIGN；
By geology and well-log information, the dry developmental state on hot dry rock stratum is studied, determines that dry is developed
Area and dry major developmental direction determine injection-production well target position and horizontal well orientation (horizontal well orientation and major fracture side
To vertical), it determines horizontal well zip mode staged fracturing position and completes relevant to be drilled well, pressing crack construction conceptual design.
Step (2): drilling well, setting of casing, well cementing operation that note adopts horizontal well are completed；
The main lithology of hot dry rock is igneous rock and sedimentary rock, and hot dry rock depth is 2000~6000m；Two mouthfuls of water horizontal wells are equal
The casing programme for opening cased hole completion using three, injection-production well drilling well, well-completing process are identical；One spud in into bit diameter be greater than
400mm, two spud in into bit diameter be greater than 300mm, three spud in into bit diameter be greater than 200mm；One ends the lower injection of brill
Well surface pipe 11 and extraction well surface pipe 21, the well cementation of G class g cement, cement return to ground；Two spudding wells are to xeothermic rock stratum position
Upper formation finishing drilling, two end bore layer position should more than hot dry rock top layer 50~70m (namely bottom Ying Gan of protective casing
50~70m above hot rock top layer), lower injection well protective casing 12 and extraction well protective casing 22 after finishing drilling, the well cementation of G class g cement,
Cement returns to ground；Three be opened in hot dry rock complete horizontal segment drilling, horizontal section length be 1000~2000m, after finishing drilling under
Injection well production casing 13 and extraction well production casing 23, the well cementation of G class g cement, cement return to ground；Injection well production casing 13
It is greater than 100w/ (m.k) with the thermal coefficient of extraction production casing 23, the thermal coefficient of G grades of cementing concretes is greater than 20w/ (m.k).
Step (3): by zip mode staged fracturing, note is made to adopt the man-made fracture between horizontal well and the abundant ditch of dry
It is logical, form complicated crack communication area；
Horizontal well carries out to continuous perforation, pressure break paragraph by paragraph by Staged Fracturing Technique In Horizontal Wells from toe-end to butt, two mouthfuls
Fractured horizontal well mutually staggers two-by-two between crack, so that every man-made fracture can communicate with each other with dry, reduces people
The probability that work crack is directly linked up.For the complexity for ensuring crack in crack communication area in fracturing process, refracturing can be carried out；
The number of segment of two mouthfuls of water horizontal well zip mode staged fracturings is 5~9 sections；Preforation tunnel is Spiral distribution, and preforation tunnel spacing is 0.05
~0.2m, the phase angle of preforation tunnel are 45~60 °；Man-made fracture length is 50~100m, two mouthfuls of water horizontal well fracturing fractures it
Between in state is mutually staggered, the spacing of the adjacent man-made fracture of two mouthfuls of water horizontal wells is 50~200m；Two mouthfuls of water horizontal well zip mode segmentations
The fracturing fluid of pressure break is that addition appropriate amount of quartz sand is constituted in clear water, and quartz sand is as proppant.
Step (4): installation injection well, extraction well wellhead equipment and generating equipment are developed enhancedly by cycle fluid
Thermal resource；
After injection-production well pressing crack construction, in the corresponding placement injection device 4 of respective well head, extraction equipment 5 and cycle fluid
Feed-line 7 installs generating equipment 6 in terrestrial power generation factory, is equipped with cycle fluid, the circulation industrial in cycle fluid feed-line 7
Matter is clear water or critical carbon dioxide；Low-temperature circulating working medium is injected from Injection Level well, enters pit shaft by injection device 4,
By injection well man-made fracture 15 enter two horizontal wells between crack communication area 3, in crack communication area 3 low-temperature circulating working medium with
Become high temperature circulation working medium after carrying out sufficiently heat exchange between hot dry rock；High temperature circulation working medium enters from the man-made fracture 25 of extraction well
In pit shaft, the generating equipment 6 for entering power plant along pit shaft and well head extraction equipment 5 generates electricity, the cooling cycle work after power generation
Matter reenters the heat exchange that cycle fluid feed-line 7 carries out a new round.
From the above mentioned, the utility model develops the well pattern structure and its development technology of enhanced underground heat, in dry base
Complicated seam net is formed by artificial seam on plinth, high efficient heat exchanging channel is formed between Liang Koushui horizontal well, greatly improves heat exchange
Efficiency.Specifically, the straight well of the horizontal well in the utility model compared to the prior art can sufficiently link up the nature in rock stratum
Crack increases pit shaft and hot dry rock contact area, forms manually splitting for alternating expression by the zip mode staged fracturing of dual horizontal well
Seam, man-made fracture and dry are sufficiently linked up and gull size and expanded range, is formed and is answered between Liang Koushui horizontal well
Miscellaneous crack communication area, crack communication area improve two mouthfuls of water horizontal well cracks connection probabilities, provide and fill for the heat exchange of cryogenic fluid
The hot switching path divided, expand hot dry rock utilizes area, is conducive to the temperature and flow that improve injection-production well cycle fluid.
The utility model develops the well pattern structure and its development technology of enhanced underground heat, overcomes enhanced underground heat and routinely opens
The shortcomings that difficult, heat exchange is insufficient, note adopts flow and recharge low efficiency, is linked up in crack in forwarding method, is the efficient of enhanced underground heat
Exploitation provides new thought.
In above-mentioned steps (1), well-log information refers to crustal stress well log interpretation data and bottom hole path interpretation data.
In above-mentioned steps (3), Injection Level well staged fracturing technique refers to back-up sand segmented fracturing technology, mechanical bridge plug
Formula staged fracturing technique or packer staged fracturing technique.
Further, in the present embodiment, the horizontal segment of two horizontal wells be located at hot dry rock stratum middle part position or in
The spacing of upper portion, the horizontal segment of two horizontal wells is long less than twice of man-made fracture greater than one times of man-made fracture length
Degree；Well head spacing of the injection-production well in the rectilinear direction of vertical two horizontal segment is 100~200m.
Injection well 1 is parallel with extraction 2 drilling well orientation of well, and the drilling well gun parallax of two mouthfuls of wells is 0 ° or 180 °, i.e. two mouthfuls of water
Horizontal well is in setting in the same direction or in oppositely arranged.
When the thickness of the hot dry rock of exploitation is thicker, two mouthfuls of water horizontal wells disposed in parallel can be become vertical design (i.e.:
Vertical direction is set by injection-production well horizontal segment), injection well produces well in xeothermic rock stratum portion on the lower side in xeothermic rock stratum portion on the upper side,
Horizontally disposed two mouthfuls of water horizontal well horizontal segment is converted into being vertically arranged；It hangs down yet by zip mode staged fracturing technique in hot dry rock
Histogram is upwardly formed complicated fracture network, injects low-temperature circulating working medium by upper water horizontal well, working medium passes through under the effect of gravity
The horizontal well extraction after the heat exchange of complex fracture network in lower part is crossed to generate electricity.
The utility model has the following beneficial effects: the well pattern structure safety and environmental protection of the enhanced underground heat of (1) exploitation, without waste liquid
(slag) discharge, cycle fluid can reuse.(2) compared with existing straight well, horizontal well considerably increases pit shaft and splits naturally
The communication range of seam, increases hot dry rock heat exchange area.(3) alternating expression is formed by dual horizontal well zip mode staged fracturing technique
Man-made fracture, communicate with each other to form complicated crack communication area between man-made fracture and dry, be cycle fluid with it is xeothermic
Abundant heat exchange between rock provides channel.(4) well pattern structure of the enhanced underground heat of the exploitation is guaranteeing cycle fluid outlet temperature
The flow of cycle fluid is increased under the premise of degree, can increase generated output.(5) dual horizontal well zip mode staged fracturing technique
The success rate for substantially increasing the communication of two cracks Kou Jing can be improved primary connection success rate, reduces and subsequent remedy construction and make
Industry.
Embodiment one
The well pattern structure of enhanced underground heat is developed to the utility model with a specific example below and its development technology is made
Illustrate:
Step (1), according to geologic information, crustal stress well-log information and the bottom hole path in enhanced geothermal exploitation area
Data determines dry developmental state and the dry major developmental direction on hot dry rock stratum, the dry of the present embodiment
Major developmental direction is north-south direction (as shown in Figure 1), therefore, the drilling well orientation of two mouthfuls of water horizontal wells for east-west to；It determines
It simultaneously completes relevant to be drilled well, Construction Scheme in horizontal well zip mode staged fracturing position.
Step (2), injection well 1 and the extraction drilling well orientation of well 2 are opposite (as shown in Figure 1) in the present embodiment, i.e. two wells
180 ° of drilling well interferometry difference；Two mouthfuls are rationally designed according to the long monitoring result of the seam of man-made fracture after the horizontal well hydraulic fracturing of this area
Well is in the well spacing in vertical bore direction, and well head spacing of the injection-production well in vertical bore direction is 150m in the present embodiment, and two
Mouth well is all made of three casing programmes for opening cased hole completion；
Note, which adopts horizontal well and is all made of the drill bit of Φ 444.5mm, to be completed one and spuds in into, tripping in Φ 339.7mm after finishing drilling, thermally conductive
Coefficient is greater than the J grade surface pipe of 100w/ (mk), is completed using the G class g cement that thermal coefficient should be greater than 20w/ (mk)
It cements the well, returns to ground on cement；Two are completed using the drill bit of Φ 311.2mm to spud in into finishing drilling layer position should be in hot dry rock top 70m
Place, tripping in Φ 244.5mm, thermal coefficient are greater than the J grade protective casing of 100w/ (mk) after finishing drilling, should using thermal coefficient
G class g cement greater than 20w/ (mk) completes well cementation, returns to ground on cement；Three are completed using the drill bit of Φ 215.9mm to spud in
Into horizontal segment is crept into hot dry rock, and horizontal section length 1500m, tripping in Φ 139.7mm, thermal coefficient are greater than after finishing drilling
The J grade production casing of 100w/ (mk) completes well cementation, water using the G class g cement that thermal coefficient should be greater than 20w/ (mk)
Ground is returned on mud.
Step (3), note are adopted horizontal well and are realized between man-made fracture and hot dry rock dry by zip mode staged fracturing
Abundant communication.Horizontal well is carried out piecewise perforation from toe-end to butt by that can bore bridge plug staged fracturing technique by horizontal well, is penetrated
Hole eyelet uses Spiral distribution, pitch of holes 0.1m, and perforation phase angle is 45 °, uses during fractured horizontal well in embodiment
For clear water+quartz sand as fracturing fluid, pressure break number of segment is 5 sections, and the half of man-made fracture is long to be greater than 75m.Two mouthfuls of water horizontal well fracturing fractures
Between mutually stagger two-by-two, link up every man-made fracture can with dry sufficiently, reduce man-made fracture and directly link up
Probability, the adjacent man-made fracture spacing of two wells is 150m in embodiment.It is to ensure crack in the communication area of crack in fracturing process
Complexity can carry out refracturing.
Step (4) installs the delivery pipe of injection device, extraction equipment and cycle fluid in injection well and the well head for producing well
Line.Cycle fluid in the present embodiment is clear water, and the water at low temperature injected from Injection Level well enters pit shaft by injection device, so
Enter the crack communication area between horizontal well by man-made fracture afterwards, is carried out sufficiently between water at low temperature and hot dry rock in the communication area of crack
Become high-temperature water after heat exchange；High-temperature water enters in pit shaft from the man-made fracture of extraction well, enters along pit shaft and well head extraction equipment
The generating equipment in power plant generates electricity, and the feed-line that the cooling water after power generation reenters cycle fluid carries out a new round
Heat exchange.
The above descriptions are merely exemplary embodiments of the present utility model, the model being not intended to limit the utility model
It encloses.Any those skilled in the art, made equivalent change under the premise of not departing from the conceptions and principles of the utility model
Change and modify, should belong to the range of the utility model protection.
Claims (7)
1. a kind of well pattern structure for developing enhanced underground heat, which is characterized in that set in the dry development area on hot dry rock stratum
It sets a pair of of note and adopts horizontal well, injection well and the horizontal segment for producing well are parallel to each other and the major fracture direction with dry development area
Vertically, the horizontal segment of two horizontal wells is in same level；Two mouthfuls of water horizontal well zip mode staged fracturings form alternating expression people
Work crack, man-made fracture link up dry and extend, extend, and form complex fracture between Liang Koushui horizontal well and link up area；Injection
Injection device is arranged in the well head of horizontal well, produces the well head setting extraction equipment of horizontal well, the injection device and extraction equipment
A generating equipment is connected to by cycle fluid feed-line respectively.
2. developing the well pattern structure of enhanced underground heat as described in claim 1, which is characterized in that the horizontal segment of two horizontal wells
The spacing of upper position positioned at hot dry rock stratum, the horizontal segment of two horizontal wells is greater than one times of man-made fracture length and is less than
Twice of man-made fracture length.
3. developing the well pattern structure of enhanced underground heat as described in claim 1, which is characterized in that a pair of note adopts horizontal well and is
Three open the casing programme of cased hole completion；One spud in into bit diameter be greater than 400mm, two spud in into bit diameter be greater than
300mm, three spud in into bit diameter be greater than 200mm；One ends brill layer casing and the well cementation of G class g cement；Two end under brill
Protective casing and the well cementation of G class g cement, three end the lower production casing of brill and the well cementation of G class g cement；Two end brill layer position should be in hot dry rock
More than top layer 50~70m；Three horizontal segments opened are located in hot dry rock, and horizontal section length is 1000~2000m；Production casing is led
Hot coefficient is greater than 100w/ (m.k), and the thermal coefficient of G grades of cementing concretes is greater than 20w/ (m.k).
4. developing the well pattern structure of enhanced underground heat as described in claim 1, which is characterized in that two mouthfuls of water horizontal well zip modes point
The number of segment of section pressure break is 5~9 sections；Preforation tunnel is Spiral distribution, and preforation tunnel spacing is 0.05~0.2m, the phase of preforation tunnel
Parallactic angle is 45~60 °；Man-made fracture length is 50~100m, in the state that mutually staggers between two mouthfuls of water horizontal well fracturing fractures, two
The spacing of the adjacent man-made fracture of saliva horizontal well is 50~200m.
5. developing the well pattern structure of enhanced underground heat as described in claim 1, which is characterized in that in cycle fluid feed-line
Equipped with the cycle fluid that can be sufficiently exchanged heat between hot dry rock in the communication area of crack, which is clear water or faces
Boundary's carbon dioxide.
6. developing the well pattern structure of enhanced underground heat as described in claim 1, which is characterized in that injection well and extraction well drilling well
Orientation is parallel, and the drilling well gun parallax of two mouthfuls of wells is 0 ° or 180 °.
7. developing the well pattern structure of enhanced underground heat as described in claim 1, which is characterized in that two mouthfuls of water horizontal well zip modes point
The fracturing fluid of section pressure break is that addition appropriate amount of quartz sand is constituted in clear water.
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| CN112780232A (en) * | 2021-02-01 | 2021-05-11 | 中国地质调查局水文地质环境地质调查中心 | Pressure-control heat-insulation exploitation system for hot dry rock |
| CN113389537A (en) * | 2021-06-29 | 2021-09-14 | 太原理工大学 | Hot dry rock geothermal exploitation method for filling thermal reservoir in later stage of deep crack |
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| CN114961668B (en) * | 2022-05-18 | 2023-12-29 | 太原理工大学 | Fracture type dry hot rock reservoir double inclined shaft sectional regulation and control reinforced heat collection method |
| CN115182712B (en) * | 2022-07-20 | 2023-06-13 | 中国长江三峡集团有限公司 | Dry-hot rock geothermal and shale gas combined production system and construction method thereof |
| CN115182712A (en) * | 2022-07-20 | 2022-10-14 | 中国长江三峡集团有限公司 | Hot dry rock geothermal and shale gas combined mining system and construction method thereof |
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