CN108691527A - A kind of method that individual well takes thermal medium exploitation hot water type geothermal energy - Google Patents
A kind of method that individual well takes thermal medium exploitation hot water type geothermal energy Download PDFInfo
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- CN108691527A CN108691527A CN201710085095.5A CN201710085095A CN108691527A CN 108691527 A CN108691527 A CN 108691527A CN 201710085095 A CN201710085095 A CN 201710085095A CN 108691527 A CN108691527 A CN 108691527A
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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Abstract
The present invention relates to a kind of individual wells to take the method that thermal medium develops hot water type geothermal energy, sequentially includes the following steps:U-shaped well is bored in hot water type geothermal layer, U-shaped well is horizontal segment, cased hole completion in geothermal layer;Tripping in oil pipe in casing, horizontal segment oil pipe is helically around filiform, to increase heat exchange contact area;It is preferred that suitable working media, it is injected from one end of U-shaped well, when injection, is in a liquid state, after carrying out heat exchange with geothermal layer in horizontal segment heat absorption become gaseous state, produced from the other end;Several temperature of arrangement, pressure, flow sensor, monitor downhole conditions in real time in well head and horizontal segment;Output gas is used to generate electricity or becomes liquid after carrying out heat exchange with other media on ground, and the working media of liquid is injected from injection end again, recycles above-mentioned steps;In entire cycle, working media is in sealing state always, without excessive.This method is simple for process, easy to operate, safety non-pollution, has high value of practical.
Description
Technical field
The present invention relates to geothermal energy development field, it is specifically related to a kind of individual well and takes thermal medium exploitation hot water type geothermal energy
Method.
Background technology
Geothermal energy resources have been paid attention to by the world extensively as a kind of clean reproducible energy, and development potentiality is huge.Geothermal energy
It is the novel renewable energy of clean environment firendly, resource reserve is big, distribution is wide, development prospect is wide, and market potential is huge.Actively open
Hair using geothermal energy to alleviate China's energy resources pressure, realize non-fossil energy targets, promote production of energy and consumption revolution,
Ecological Civilization Construction is promoted to have important practical significance and long-range strategic importance.In recent years, China's energy external dependence degree
Rise year by year, the nervous situation of national energy supply can be alleviated by developing and using geothermal energy resources, can ensure national energy supply security;Together
When, low energy consumption for exploitation and utilization of geotherm resources, pollution is small, and geothermal energy is regenerative resource, therefore develops and uses geothermal energy resources again
It can promote Resources for construction economizing type and friendly environment society, realize sustainable development, there is vast potential for future development.
I.e. after the drilling well of underground heat water-bearing layer, direct pumping GEOTHERMAL WATER to ground carries out for conventional geothermal resource of hydrothermal type exploitation
It utilizes.But this kind of recovery method can cause a series of problems, as GEOTHERMAL WATER exhaustive exploitation causes level of ground water to decline, ground is heavy
The geologic Environment Problems such as drop, ground level deformation;Terrestrial heat water discharge after utilization also brings along many problems, discharges ground as changed
Ecological environment, contaminated soil environment etc..
Based on U-shaped well drilling technology, the problems such as current hot water type geothermal utilization water resource exhaustive exploitation, oil pipe is utilized
It is set to carry out heat exchange with the GEOTHERMAL WATER in oil jacket annular space as the circulation line for taking thermal medium, it is proposed that one kind is based on taking thermal technology
Make the hot water type geothermal energy development method that medium circulation utilizes technology.This method drills through U-shaped net horizontal section, completion in geothermal layer
Afterwards using take thermodynamic medium phase-state change by geothermal energy carry to ground carry out geothermal energy development and utilization.Whole process
In, it takes thermodynamic medium and is in closed circulation state, avoid geology and environmental problem that conventional GEOTHERMAL WATER mining belt is come.
Invention content
The object of the present invention is to provide a kind of individual wells to take the method that thermal medium develops hot water type geothermal energy, makes full use of
Thermodynamic medium physical characteristic is taken, increasing contact area promotion using spiral surrounding shape oil pipe takes thermal medium in oil pipe and underground heat
Water carries out heat exchange, and then phase-state change occurs, to effectively be developed to geothermal energy.
The technical scheme is that:A kind of method that individual well takes thermal medium exploitation hot water type geothermal energy, specific steps are such as
Under:
(1) premenstruum (premenstrua) geologic prospect, be expounded through peer review, reasonably select hot water type underground heat target reservoir at one;
(2) it drills through a bite horizontal well and constitutes U-shaped well with a bite straight well;
(3) it is cemented the well to U-shaped well, completion practice;
(4) tripping in perforating gun is to U-shaped well horizontal segment, by casing, cement sheath and the geothermal reservoirs in target geothermal reservoir region
Layer is shot through, to form the preforation tunnel of reasonable layout in net horizontal section;
(5) geothermal layer horizontal segment is handled using acid solution after completion, increases geothermal reservoir permeability;
(6) the tripping in oil pipe in U-shaped well;
(7) sensor, monitoring temperature, pressure, flow are installed in well head and horizontal segment suitable location, data pass through optical fiber reality
When be transmitted to ground;
(8) well head and ground installation are installed;
(9) ground injection pump is utilized, liquid is taken into thermodynamic medium and is injected from injection well, itself and oil in horizontal segment oil pipe
Cover annular space in GEOTHERMAL WATER carry out heat exchange, after heat absorption working media will become gaseous state from extraction well produce to ground;
(10) it on ground, carries out power generation using gaseous working media or carries out heat exchange with other media to utilize it
Thermal energy, later its will become liquid, to continue cycle from injection well inject.
Further, with changing exploitation using phase after the GEOTHERMAL WATER progress heat exchange taken in thermal medium and geothermal layer
Thermal energy avoids and GEOTHERMAL WATER is directly pumped into ground.
Further, in step (1), selected well location should have good geothermal reservoir, have again good
Surface conditions are to be conducive to construction.
Further, in step (2), when drilling well, should select large scale drill bit as possible, to expand hole diameter, the well of injection well
Bottom depth is greater than the bottom depth of extraction well, to there is rational depth difference therebetween, can utilize ground in horizontal well drilling section
The technology of matter steerable drilling, is precisely controlled well track.
Further, in step (3), high heat conduction cement, high heat conduction casing are used when cementing the well to injection well and horizontal segment,
Using low heat conduction cement, thermal sleeve when to extraction well well cementation.
Further, in step (4), after fully considering geothermal layer geologic feature, and it is strong not destroying casing pressure-bearing
Reasonable Arrangement perforating site under the premise of degree, optimization perforation quantity amount and density.
Further, it in step (5), is handled using different acid solutions for different types of geothermal reservoir, such as
Hydrochloric acid acidification can be used in carbonate reservoir, and soil acid acidizing etc. can be used in sandstone reservoir.
Further, in step (6), injection well and geothermal layer horizontal segment tripping in high heat conduction oil pipe, and in horizontal segment
Oil pipe is helically around shape, and to increase the heat exchange contact area for taking thermodynamic medium, extraction well oil pipe uses insulated tubing, and
Insulating layer is built between oil pipe and casing.
Further, in step (7), sensor, monitoring temperature, pressure, flow are installed in well head and horizontal segment both ends
Etc. parameters, monitor collected data and handled by fiber optic cables real-time Transmission to ground, in favor of ground injection rate, note
Enter the adjustment of the parameters such as speed and well head pressure.
Further, in step (9), because injection well is big compared with extraction well depth, there is difference in height between injection-production well, take thermal technology
Make that entire horizontal segment oil pipe will be full of after medium injection under the effect of gravity, so with outside oil pipe GEOTHERMAL WATER and geothermal layer occur
Heat exchange, temperature gradually rise, and when reaching boiling point, become gaseous state from liquid, and then utilize the devices such as the draw-off pump of extraction well
It is acquired to ground.
Further, in step (9), preferred, ideal shape should be carried out according to the condition of geothermal reservoir by taking thermodynamic medium
Its boiling point should be slightly below geothermal layer temperature under state, it is ensured that it becomes gaseous state, and its specific heat after carrying out heat exchange in geothermal layer
Rong Yao great, such unit volume working media can absorb more heats, and according to different situations, taking thermodynamic medium can be
Common water or other eligible, function admirable fluids or mixture.
Further, in step (10), mined high-temperature gas takes thermodynamic medium and is preferably used for generating electricity, later
According to waste heat situation, Multi-class propagation can be carried out until it becomes liquid and temperature is reduced to after environment temperature and is noted again from injection well
Enter to be recycled.
The present invention is as follows using the principle that working media progress geothermal energy development utilizes:Working media is passed through first U-shaped
Well injection end injects in geothermal reservoir, and because temperature gradually rises in pit shaft, working media constantly absorbs heat, especially in geothermal reservoir water
Horizontal well section part, gas is eventually become after working media heat absorption, is finally passed through production end and is produced;On ground, gaseous work is utilized
Make medium power generation or become liquid again after carrying out heat exchange with other media, refills, recycle later.Entire cycle
Process can be divided into four-stage:Liquid working media injection stage, working media heat exchange stage, gaseous working medium produce rank
Section, gaseous working medium ground utilize the stage.
Beneficial effects of the present invention are:1. the present invention uses individual well mining geothermal energy, can effectively reduce conventional underground heat exploitation
It notes, adopt well drilling well construction and ground soil collection construction cost.2. carry out underground heat exploitation using this method, without extracting underground
Hot water can keep subterranean geology original appearance to greatest extent, reduce the yield to underground water and be avoided that mining of groundwater band
The geologic Environment Problems such as the surface subsidence, the level of ground water decline that come;Meanwhile it also avoiding the geothermal tail water processing after utilizing and asking
Topic, the problems such as no longer needing to drill through geothermal reinjection well, save great amount of cost, and avoid earthquake caused by ground recharge.3. horizontal segment
Using high heat conduction spiral oil pipe or other high-efficiency thermal displacement apparatus, promote to take thermodynamic medium and GEOTHERMAL WATER progress heat exchange,
Raising is taken thermodynamic medium temperature and is promoted so that it becomes gaseous state;Meanwhile production end is protected using filling in insulated tubing and oil jacket annular space
Warm layer can reduce the thermal loss during extraction, improve take hot fluid adopt thermal energy power;In addition, taking hot fluid on ground
Becoming liquid after heat exchange can re-inject, and recycle.Whole process carries out in closing pipe network, takes thermodynamic medium without outer
It lets out, efficient, safety and environmental protection.4. by rationally preferably taking thermodynamic medium, it can be achieved that regardless of geothermal layer temperature, injecting
Working media is liquid when end, becomes gaseous state after heat exchange in underground heat horizontal segment.
Description of the drawings
Fig. 1 is the casing programme schematic diagram that individual well takes that thermal medium develops hot water type geothermal energy.
Wherein, 1, injection well wellhead assembly, 2, injection well Well mouth sensor, 3, overlying interlayer, 4, injection casing, 5, note
Enter well oil pipe, 6, geothermal reservoir, 7, horizontal segment sensor, 8, centralizer, 9, horizontal segment oil pipe, 10, preforation tunnel, 11, it is horizontal
Section casing, 12, horizontal segment sensor, 13, extraction well oil pipe, 14, extraction casing, 15, thermal insulation layer, 16, extraction well well head passes
Sensor, 17, extraction well wellhead assembly, 18, terrestrial power generation station or heat-exchange device.
Fig. 2 is helical form circular tube schematic diagram.
Specific implementation mode
The present invention is described in detail below in conjunction with the accompanying drawings.
A kind of method that individual well takes thermal medium exploitation hot water type geothermal energy, is as follows:
(1) pass through geological prospecting early period, be expounded through peer review hot water type underground heat purpose of horizon 6 at preferably one;
(2) a bite horizontal well and a bite straight well are drilled through in geothermal reservoir, horizontal well horizontal segment is located in geothermal reservoir, profit
Horizontal segment is mutually linked up with extraction well with Geosteering Drilling Technology and is connect, and the well depth of injection well is greater than extraction well, it is horizontal
Duan Chengxian certain slopes are tilted to extraction well end;
(3) it is to increase heat exchange contact area, net horizontal section should be grown as possible under economic technology conditions permit, and horizontal well
Eye radius also should be big as possible, so as to tripping in large diameter oil tube, increases heat exchange contact area.
(4) injection well and horizontal segment are cemented the well using high heat conduction cement mortar, and form injection well using high heat conduction casing
Casing 4, horizontal segment casing 11, extraction well is cemented the well using insulating cement and thermal sleeve 14;
(5) well section and net horizontal section are injected using high heat conduction oil pipe composition injection well oil pipe 5, horizontal segment oil pipe 9, produce well
Section uses insulated tubing 13, and produces filled polyurethane formation of foam thermal insulation layer 15 in well section oil jacket annular space, with further heat-insulated
Heat preservation;
(6) segmenting perforating is carried out in net horizontal section and obtain preforation tunnel 10, establish underground heat water flow channel, perforation scale
It can rationally be determined according to casing and geothermal layer characteristic;
(7) net horizontal section is acidified after perforation, releases pollution caused by the operations such as drilling well and well cementation, enhances geothermal layer
Percolation ability, increase the fluid ability of GEOTHERMAL WATER;
(8) centralizer 8 is installed in entire U-shaped well well section, especially net horizontal section, to ensure that oil pipe is located among casing,
GEOTHERMAL WATER is full of in horizontal segment oil jacket annular space at this time;
(9) in injection well, extraction well well head, horizontal segment both ends appropriate location is installed sensor 2,7,11,15, can be supervised in real time
The parameters such as testing temperature, pressure, flow;
(10) injection well and extraction well are opened, liquid low temperature is taken into thermodynamic medium and is injected into geothermal layer from injection well
In horizontal segment oil pipe 9 because injection well is deeper, due to gravity, take thermal medium will in horizontal segment oil pipe from injection end to
Production end is migrated, and thermodynamic medium is taken in migration process and carries out heat exchange by oil pipe, eventually becomes gaseous state after heat absorption, and by
Well wellhead assembly 17 is produced to acquire to ground;
(11) the selection Main Basiss geothermal layer temperature for taking thermodynamic medium, should make it in the item of slightly below geothermal layer temperature
Gasification becomes gaseous state under part, and has high density, the characteristic of high specific heat capacity as far as possible, to increase caloric receptivity;
(12) in injection process, downhole conditions are judged according to Sensor monitoring data, if sensor 12 monitors level
Section production end still contains more liquid-working-medium, then should reduce the injection rate of injection end, reduces injection rate, makes in horizontal segment
Heat exchange fully carry out;
(13) it if sensor 2 monitors that the equivalent flow of injection end and production end is unequal with 16, can determine whether as well
It is lower to leak, injection should be suspended, search reason;
(14) it after the gaseous working medium of production end reaches ground, generates electricity, and carries out preferably by surface power station 18
Multi-class propagation can be refilled until its temperature reaches room temperature and becomes liquid again by injection end wellhead assembly 1 at this time
It is recycled;
(15) rational working system is maintained, ensures that cycle constantly carries out.
(16) it takes thermodynamic medium in order to allow and fully carries out heat exchange, the oil pipe of horizontal segment is replaced by other efficient
Heat displacer, or oil pipe can be processed as to spiral surrounding shape, to increase heat exchange contact area, as shown in Figure 2.Meanwhile
Dual horizontal well or multilevel well technology can also be used, multiple net horizontal sections are established in geothermal layer to increase heat exchange contact face
Product.
This method not groundwater abstraction can reduce water resource exploitation, prevent the geology rings such as surface subsidence, ground level deformation
Border problem;Also the problems such as not having geothermal reinjection well, can effectively avoid the earthquake caused by water filling, also can avoid because of injection water quality
The underground water pollution situation that problem is brought.Method is simple, environmental-friendly.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, it will be apparent to one skilled in the art that, under the premise of without departing from thinking of the present invention, it is similar can also to make other
Change, and this is regarded as the protection domain of technical solution of the present invention.
Claims (9)
1. a kind of method that individual well takes thermal medium exploitation hot water type geothermal energy, which is characterized in that it is as follows:
(1) premenstruum (premenstrua) geologic prospect, be expounded through peer review, reasonably select hot water type underground heat target reservoir at one;
(2) it drills through a bite horizontal well and constitutes U-shaped well with a bite straight well;
(3) it is cemented the well to U-shaped well, completion practice;
(4) tripping in perforating gun penetrates casing, cement sheath and the geothermal reservoir in target geothermal reservoir region to U-shaped well horizontal segment
It wears, to form the preforation tunnel of reasonable layout in net horizontal section;
(5) geothermal layer horizontal segment is handled using acid solution after completion, increases heat reservori permeability;
(6) the tripping in oil pipe in U-shaped well;
(7) sensor, monitoring temperature, pressure, flow are installed in well head and horizontal segment suitable location, data are passed in real time by optical fiber
Transport to ground;
(8) well head and ground installation are installed;
(9) ground injection pump is utilized, liquid is taken into thermodynamic medium and is injected from injection well, itself and oil jacket ring in horizontal segment oil pipe
GEOTHERMAL WATER in sky carries out heat exchange, and working media will become gaseous state and be produced from extraction well to ground after heat absorption;
(10) it on ground, carries out power generation using gaseous working media or carries out heat exchange using its heat with other media
Can, it will become liquid later, be injected from injection well to continue cycle.
2. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that using taking heat
Medium changes with phase after the GEOTHERMAL WATER progress heat exchange in geothermal layer and then exploitation of geothermal energy, avoids underground heat directly
Water is pumped into ground.
3. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(2) in, when drilling well, should select large scale drill bit as possible, and to expand hole diameter, the bottom depth of injection well is greater than the well of extraction well
Bottom depth, to have therebetween rational depth difference away from, in horizontal well drilling section can utilize geologic steering drilling technology, precisely
Control well track.
4. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(3) it in, is led using low when to extraction well well cementation using high heat conduction cement, high heat conduction casing when cementing the well to injection well and horizontal segment
Hot Cement, thermal sleeve.
5. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(5) it in, is handled using different acid solutions for different types of geothermal reservoir, as hydrochloric acid acid can be used in carbonate reservoir
Change, soil acid acidizing etc. can be used in sandstone reservoir.
6. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(6) in, injection well and geothermal layer horizontal segment tripping in high heat conduction oil pipe, and the oil pipe in horizontal segment helically surround shape, to increase
The heat exchange contact area for taking thermodynamic medium uses low heat-conducting oil pipes in extraction well oil pipe, and is built between oil pipe and casing
Insulating layer.
7. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(7) in, sensor is installed in well head and horizontal segment both ends, the parameters such as monitoring temperature, pressure, flow monitor collected data
It is handled by fiber optic cables real-time Transmission to ground, in favor of parameters such as ground injection rate, injection rate and well head pressures
Adjustment.
8. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(9) in, because injection well is big compared with extraction well depth, there is difference in height between injection-production well, will makees in gravity after taking thermodynamic medium injection
Be full of entire horizontal segment oil pipe with lower, so with outside oil pipe GEOTHERMAL WATER and geothermal layer heat exchange occurs, temperature gradually rises, when
When reaching boiling point, gaseous state is become from liquid, and then acquired to ground using devices such as the draw-off pumps of extraction well.
9. the method that individual well as described in claim 1 takes thermal medium exploitation hot water type geothermal energy, which is characterized in that in step
(10) in, mined high-temperature gas takes thermodynamic medium and is preferably used for generating electricity, and later according to waste heat situation, can carry out multistage
Using until it becomes liquid and temperature is reduced to after environment temperature and is recycled again from injection well injection.
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| CN201710085095.5A CN108691527A (en) | 2017-02-17 | 2017-02-17 | A kind of method that individual well takes thermal medium exploitation hot water type geothermal energy |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882165A (en) * | 2019-04-04 | 2019-06-14 | 成都理工大学 | Geothermal resource mining simulation device and operation method using microwave heating and infrared temperature measurement |
| CN111236904A (en) * | 2020-01-19 | 2020-06-05 | 中国地质科学院勘探技术研究所 | Geothermal exploitation method for double horizontal wells in butt joint communication to extract heat by water separation |
| WO2020113914A1 (en) * | 2018-12-05 | 2020-06-11 | 田振林 | Process for improving heat production capacity of geothermal well |
| CN111520110A (en) * | 2019-02-02 | 2020-08-11 | 中国石油天然气股份有限公司 | Supercritical CO of horizontal well2Method and system for developing enhanced geothermal energy by fracturing |
| CN113224979A (en) * | 2021-06-16 | 2021-08-06 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Geothermal/seawater semiconductor temperature difference power generation system and method |
| CN113236189A (en) * | 2021-05-21 | 2021-08-10 | 中国地质科学院勘探技术研究所 | Efficient lossless heat-taking geothermal exploitation system and method |
| CN113863910A (en) * | 2021-10-27 | 2021-12-31 | 西安科技大学 | An integrated method for coal underground in-situ gasification and thermal energy co-mining |
| CN114198016A (en) * | 2021-12-31 | 2022-03-18 | 北京派创石油技术服务有限公司 | Geothermal closed-loop working medium circulating exploitation method |
| CN114320791A (en) * | 2022-01-17 | 2022-04-12 | 中国科学院广州能源研究所 | Karst thermal carbon dioxide storage U-shaped heat pipe power generation system |
| CN114659284A (en) * | 2022-03-31 | 2022-06-24 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Multistage circulating heat-taking device and method for high-temperature rock mass |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020113914A1 (en) * | 2018-12-05 | 2020-06-11 | 田振林 | Process for improving heat production capacity of geothermal well |
| CN111520110A (en) * | 2019-02-02 | 2020-08-11 | 中国石油天然气股份有限公司 | Supercritical CO of horizontal well2Method and system for developing enhanced geothermal energy by fracturing |
| CN111520110B (en) * | 2019-02-02 | 2022-06-03 | 中国石油天然气股份有限公司 | Supercritical CO of horizontal well2Method and system for developing enhanced geothermal energy by fracturing |
| CN109882165A (en) * | 2019-04-04 | 2019-06-14 | 成都理工大学 | Geothermal resource mining simulation device and operation method using microwave heating and infrared temperature measurement |
| CN111236904A (en) * | 2020-01-19 | 2020-06-05 | 中国地质科学院勘探技术研究所 | Geothermal exploitation method for double horizontal wells in butt joint communication to extract heat by water separation |
| CN111236904B (en) * | 2020-01-19 | 2021-03-23 | 中国地质科学院勘探技术研究所 | Geothermal exploitation method for double horizontal wells in butt joint communication to extract heat by water separation |
| CN113236189A (en) * | 2021-05-21 | 2021-08-10 | 中国地质科学院勘探技术研究所 | Efficient lossless heat-taking geothermal exploitation system and method |
| CN113224979A (en) * | 2021-06-16 | 2021-08-06 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Geothermal/seawater semiconductor temperature difference power generation system and method |
| CN113863910A (en) * | 2021-10-27 | 2021-12-31 | 西安科技大学 | An integrated method for coal underground in-situ gasification and thermal energy co-mining |
| CN113863910B (en) * | 2021-10-27 | 2022-05-06 | 西安科技大学 | Underground in-situ gasification and heat energy co-extraction integrated method for coal |
| CN114198016A (en) * | 2021-12-31 | 2022-03-18 | 北京派创石油技术服务有限公司 | Geothermal closed-loop working medium circulating exploitation method |
| CN114320791A (en) * | 2022-01-17 | 2022-04-12 | 中国科学院广州能源研究所 | Karst thermal carbon dioxide storage U-shaped heat pipe power generation system |
| CN114659284A (en) * | 2022-03-31 | 2022-06-24 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Multistage circulating heat-taking device and method for high-temperature rock mass |
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Application publication date: 20181023 |