CN105840146A - Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies - Google Patents
Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 76
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- 238000005516 engineering process Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000009413 insulation Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 2
- 238000013329 compounding Methods 0.000 claims 2
- 230000005611 electricity Effects 0.000 claims 1
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- 235000020681 well water Nutrition 0.000 claims 1
- 239000002349 well water Substances 0.000 claims 1
- 238000005381 potential energy Methods 0.000 abstract 2
- 238000004891 communication Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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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
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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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
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Abstract
The invention relates to the field of geothermal exploitation and provides a method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies. According to the method, firstly, multilateral well holes are drilled in different depths of a reservoir of the hot dry rock, the reservoir between upper and lower multilateral well holes is fractured with the volume fracturing technology, a high-permeability hot dry rock reservoir is constructed, and finally, thermal-carrying media are injected and exploited for geothermal exploitation. Annularly-injected low-temperature thermal-carrying media flow to the fractured reservoir of the hot dry rock along the multilateral well holes in the upper part of the reservoir, flow to the multilateral well holes in the lower part under the double actions of injection pressure and potential-energy difference and finally flow back to the ground along an oil pipe. According to the method, the multilateral well and fracturing technologies are sufficiently utilized, the reservoirs of the hot dry rock are effectively communicated, the problem about crack communication during conventional double-well fracturing for injection and exploitation is solved, the potential-energy difference in different depths can be further effectively utilized, and the flowing capability of the thermal-carrying media is greatly improved. With the use of the thermal insulation oil pipe, the thermal loss in the exploitation process of the thermal-carrying media is further reduced, and the exploitation efficiency of geothermal energy is improved.
Description
Technical field
The present invention relates to geothermal energy development field, be specifically related to a kind of Multilateral Wells volume fracturing self-loopa exploitation hot dry rock ground
By the use of thermal means.
Background technology
Underground heat is to have one of promising regenerative resource, compared with other new forms of energy such as solar energy, wind energy and biomass energy,
There is distribution wide, by features such as ectocine little (as round the clock, wind speed, the temperature difference), carbon emission amount and maintenance cost are low.
China is located in circum pacific geothermal belt and Mediterranean-HIMALAYA GEOTHERMAL BELT region, and geothermal energy resources enrich.There is relatively usury
It is usually located near the volcanic belt that tectonic movement is active with high-temperature geothermal reservoir in the tradition being worth, but is limited by geographical environment
And reserves scale, abundant geothermal energy cannot obtain effective exploitation and utilize.Along with prospecting the progress of development technique, deep
Geothermal energy resources such as hot dry rock etc. is paid close attention to widely.
Deep earth heart can be based on middle high temperature dry-hot-rock geothermal resource.Dry-hot-rock geothermal resource distribution is wide, reserves greatly, be not subject to
Geographical restriction, is the major domain of following geothermal energy development.Correlative study shows, China's buried depth is in 3000-8000m
Dry-hot-rock geothermal recoverable reserves be 1.49 × 1021Tens times of J, about national total energy consumption in 2014.Rationally,
Economic exploitation dry-hot-rock geothermal can be possible not only to play energy-saving and emission-reduction and the effect of energy adjustment, can be more remote districts energy
Source demand provides practical help.
Hot dry rock buries deeply, and porosity and permeability is minimum, when carrying out geothermal exploitation, needs to carry out large-scale waterpower
Fracturing reform, high the flow domain between artificial constructed injection-production well so that take thermal medium (such as water or supercritical CO2) can be
Circulate between injection-production well, by underground heat output.When using injection-production well exploitation dry-hot-rock geothermal, it is limited to well control technique and ground
The restriction of matter guiding technique, it is impossible to be accurately positioned the particular location in hot dry rock reservoir at the bottom of injection-production well, and use straight well
During pressure break, pressure break radius is limited, and fracture network, based on single major fracture, can cause fracturing fracture between injection-production well not have
Effect docking, it is impossible to set up efficient the flow domain, so that underground heat exploitation effect is undesirable.It is, therefore, desirable to provide it is new
Or improve existing hot dry rock pressure break and development technique, increase permeability and the heat exchange area of hot dry rock reservoir.
Volume fracturing technology is oil and gas development field, develops the fracturing technique come for fine and close oil-gas reservoir effective exploitation.Cause
Close oil-gas reservoir has low hole, the feature such as hypotonic, reservoir fluid cannot in reservoir high efficiency flow, therefore consider in waterpower pressure
During splitting, by net horizontal section classification pressure break, forming the complex fracture network being different from conventional pressure break, thus increase
The seepage area of reservoir and percolation ability.Hot dry rock reservoir is similar to fine and close oil-gas reservoir, uses conventional vertical well fracture technology,
Very difficult structure has the artificial heat storage of high percolation ability.Therefore, it can use for reference the volume fracturing technology in oil-gas field development field,
Improve the fracturing effect of hot dry rock reservoir.
Additionally, the Multilateral Wells technology that oil-gas field development is used can be implemented in same a bite main borehole gets out some branches
Well, such as, can be implemented in the multiple horizontal holes getting out different depth in same a bite straight well respectively, thus store up difference
The diverse location of layer or same reservoir carries out Efficient Development.The drilling cost of Multilateral Wells is than the list boring same branches quantity
Individual horizontal well cost is low so that this technology has considerable application prospect.
Based on Multilateral Wells technology and volume fracturing technology, adopt that vertical well fracture scale is limited for note at present and between well crack is not
Can the effective problem such as docking, utilize pit shaft oil pipe and oil jacket annular space as the circulation line taking thermal medium, it is proposed that Yi Zhongji
Method in individual well multilateral well section volume fracturing self-loopa exploitation dry-hot-rock geothermal.Same a bite straight well is positioned at not by the method
Carry out staged fracturing with the horizontal well branch of the degree of depth, connect upper and lower horizontal well branch, and thermal medium will be taken by straight well oil jacket
Annular space and upper water horizontal well branch heat after injecting hot dry rock reservoir, then exploit extremely through lower horizontal well branch and straight well oil pipe
Ground, carries out the development and utilization of dry-hot-rock geothermal energy.
Summary of the invention
The technical scheme is that a kind of Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method, concrete steps
As follows:
(1) determine target hot dry rock reservoir, drill through Multilateral Wells peupendicular hole section, stop to hot dry rock reservoir；
(2) enter production casing under, select the well cementation of high thermal conductivity coefficient mud, under shaft bottom, enter packer simultaneously；
(3) in straight well pit shaft, different directions to hot dry rock top reservoir drills through multiple horizontal hole, and cements the well；
(4) in straight well pit shaft, different directions to hot dry rock bottom reservoir drills through multiple horizontal hole, and cements the well；
(5) the horizontal well branch of upper and lower is carried out staged fracturing so that be positioned between upper and lower horizontal well branch is dry
Hot rock reservoir effectively connects, and forms hot dry rock and takes thermal medium and carry out the efficient seepage channel of heat exchange；
(6) lower oil pipe in Multilateral Wells peupendicular hole section, makes oil pipe and oil jacket annular space form circulation line；
(7) connection peupendicular hole section oil jacket annular space and upper water horizontal well branch, taking thermal medium can be entered by oil jacket annular space
Bu Ge horizontal well branch；
(8) in the peupendicular hole section between upper and lower horizontal well branch, under enter oil jacket annular packer, prevent from oil jacket ring
Empty inject take thermal medium to bottom horizontal well diverted flow, lower horizontal well branch connects the oil pipe in peupendicular hole section, can
Thermal medium of taking after heating is exploited to ground by oil pipe；
(9) ground uses injection pump or compressor to inject low temperature in straight well section oil jacket annular space and take thermal medium, takes thermal medium
Flow into the horizontal well Multilateral Wells section on top along oil jacket annular space, and enter in hot dry rock reservoir；
(10) thermal medium is taken under gravity and injection production pressure difference effect, along the high bleed-through road of pressure break, from hot dry rock reservoir top
Flow to reservoir bottom, take after thermal medium and hot dry rock reservoir carry out sufficient heat exchange, enter the horizontal hole of reservoir bottom,
Under the suction pump effect of ground, exploit to ground through oil pipe；
(11) on ground, mined high temperature is taken thermal medium and carries out Btu utilization, and thermal medium will be taken again after cooling
It is recycled in hot dry rock by oil jacket annular space.
Preferably: in step (1), Multilateral Wells peupendicular hole section size should be tried one's best greatly, with reduce take thermal medium oil pipe-
Flow resistance pressure drop during oil jacket annular circulation.
Preferably: in step (2), high thermal conductivity coefficient well cementation mud is selected to be conducive to the low temperature injected in oil jacket annular space
Take the heat exchange of thermal medium and surrounding formation.
Preferably: in step (3), (4), (5), in hot dry rock upper and lower, reservoir drills through horizontal well Multilateral Wells
At the moment, should be according to hot dry rock structural feature and reservoir properties, reasonable Arrangement horizontal hole orientation, density and length, maximum
Change pressure break volume, make the hot dry rock reservoir between upper and lower horizontal well branch effectively connect.General, can be the most right in plane
Should be distributed 1～4 pair of horizontal hole, single radial bore length is 100～1000m.
Preferably: in step (6), oil pipe uses insulated tubing, fully reduces the heat between oil pipe and oil jacket annular space
Exchange, takes thermal medium to the high temperature of extraction in oil pipe and plays the effect of insulation.
Preferably: in step (9), taking thermal medium can be conventional water, it is also possible to be supercritical CO2, Yi Jiqi
His function admirable take hot fluid and mixture thereof.
Preferably: in step (11), difference is taken thermal medium and in the heat exchange on ground and is utilized technique different, can be in order to
With devices such as conventional heat pump to direct uses for geothermal energy, it would however also be possible to employ double-work medium power generation technology, preferably employ here
High temperature takes thermal medium generating, and the thermal medium of taking after generating is carried out multistage Waste Heat Reuse.
The invention have the benefit that 1. use Multilateral Wells volume fracturing technology, fracturing technique i.e. can be utilized to form height and ooze
The artificial heat storage of property thoroughly, when can be avoided again twin-well distance pressure break, owing to twin-well well location is uncertain and fracturing fracture
The problem that the twin-well fracturing fracture that the reasons such as extension is uncertain cause can not efficiently connect, it is provided that a kind of safe efficient
And practicable fracturing process；2. horizontal well drilling branch at hot dry rock reservoir different depth, upper water horizontal well are used
Branch's note takes thermal medium, and lower horizontal well branch exploits the method taking thermal medium, takes thermal medium when becoming conventional underground heat exploitation
Plane flowing for perpendicular flow, effectively make use of the gravitional force between upper and lower horizontal well branch, adds and takes thermal medium and exist
Driving force in hot dry rock reservoir, advantageously reduces the power of ground injection-extraction pump；3. utilize individual well oil pipe-oil jacket annular space certainly
Circulating mode, when not only reducing conventional underground heat exploitation, twin-well bores Completion cost, it is also possible in Multilateral Wells vertical section profit
With the sleeve pipe that radius is bigger, abundant and reservoir heat exchange, improves and takes hot fluid temperature, utilize the insulated tubing that radius is less simultaneously
Carry out taking the exploitation of thermal medium, effectively reduce the heat loss taking thermal medium so that standing column well note is adopted and taken thermal medium and carry out
Underground heat exploitation is better than the U-shape structure that conventional injection-production well twin-well is constituted.
Accompanying drawing explanation
Fig. 1 reservoir Multilateral Wells structural representation (as a example by upper and lower corresponding distribution 2 is to horizontal hole).
Fig. 2 Multilateral Wells self-loopa exploitation dry-hot-rock geothermal schematic diagram (as a example by upper and lower corresponding distribution 1 is to horizontal hole)
Wherein, 1, cap rock, 2, hot dry rock reservoir, 3, artificial fracturing reservoir, 4, Multilateral Wells vertical section, 5, reservoir
Upper water horizontal well Multilateral Wells section, 6, fracturing fracture, 7, reservoir lower horizontal well Multilateral Wells section, 8, pit shaft preforation tunnel,
9, surface pipe, 10, cementing concrete ring, 11, production casing, 12, oil pipe, 13, annular packer, 14, well
End packer.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in detail.
A kind of Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method, specifically comprises the following steps that
(1) choosing hot dry rock reservoir 2, at reservoir 2 ground region, it is vertical that employing drills through Multilateral Wells more than 20 inch drill bit
Well section 4 top hole, under enter surface pipe 9, use conventional cement slurries to cement the well；
(2) employing drills through Multilateral Wells peupendicular hole section 4 lower part borehole more than 12 inch drill bit, bores chance xeothermic after drilling cap rock 1
Rock reservoir 2, regulation bit speed continues to be drilled down into, and is positioned at hot dry rock reservoir bottom upper 1-3m to drill bit and stops；
(3) production casing 11 under, and utilize thermal conductivity factor to be more than 50W/ (m DEG C) high heat-conductive water mud 10 to cement the well, simultaneously
At shaft bottom lower packet 14；
(4) on hot dry rock reservoir top, utilize casing sidetracking technology, drill through 1～4 horizontal hole 5 to different directions,
And utilize geosteering drilling tool to control horizontal hole inclination angle less than 5 °, it is 100～1000m that horizontal segment creeps into distance, under enter set
Pipe is cemented the well, and enters packer 14 under shaft bottom；
(5) in hot dry rock reservoir bottom, casing sidetracking technology is utilized, along drilling through 1～4 with upper level well equidirectional
Individual horizontal hole 7, and utilize geosteering drilling tool control horizontal hole inclination angle less than 5 °, horizontal segment creeps into distance and is
100～1000m, under enter casing cementing, and under shaft bottom, enter packer 14；
(6) utilize suitable perforation tool, to reservoir upper water horizontal well branch 5 and lower horizontal well branch 7 perforation, obtain
Obtain the preforation tunnel 8 of reasonable layout；
(7) staged fracturing of horizontal well technology is used, respectively to reservoir upper water horizontal well branch 5 and lower horizontal well branch 7
Carry out volume fracturing so that the hot dry rock reservoir between net horizontal section is by the effective UNICOM of fracturing fracture 6 up and down, is formed and takes heat
Medium carries out the seepage channel of heat exchange at reservoir；
(8) in Multilateral Wells peupendicular hole section 4, under enter the insulated tubing 12 that thermal conductivity factor is 0.05～0.2W/ (m DEG C), from
And form a circulation line with oil jacket annular space；
(9) connection peupendicular hole section 4 oil jacket annular space and upper water horizontal well branch 5, taking thermal medium can be entered by oil jacket annular space
Top each horizontal well branch 5；
(10) in the peupendicular hole section 4 oil jacket annular space between upper and lower horizontal well branch 5 and 7, under enter packer 13, prevent
The thermal medium of taking injected from oil jacket annular space flows to bottom horizontal well branch 7；
(11) ground use injection pump injects in peupendicular hole section 4 oil jacket annular space low temperature take thermal medium (include water, surpass
Critical CO2, and other function admirables take hot fluid and mixture thereof), take thermal medium along oil jacket annular space flow into upper water
Horizontal well section 5, and enter in hot dry rock reservoir 3；
(12) thermal medium is taken under self gravitation and injection production pressure difference effect, along the high seepage channel 6 of pressure break, from hot dry rock
Reservoir top flows to reservoir bottom, eventually flows to the net horizontal section 7 of reservoir bottom；
(13) high temperature in ground uses suction pump extraction vertical bore 4 oil pipe takes thermal medium so that reservoir bottom water
High temperature in horizontal well section 7 is taken thermal medium and is flowed to ground well head along oil pipe；
(14) on ground, mined high temperature is taken thermal medium and carries out Btu utilization, and the thermal medium of taking after cooling is led to
The oil jacket annular space crossing peupendicular hole section 4 is recycled in hot dry rock.
Being above a specific embodiment of the present invention, the specific embodiment of the invention can not be only limitted to this, for ability
For technical staff in territory, on the premise of without departing from thinking of the present invention, it may also be made that other similar changes, and this
It is regarded as the protection domain of technical solution of the present invention.
Claims (9)
1. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method, it is characterised in that: its specifically processing step be:
(1) at hot dry rock reservoir ground region, use conventional tower BHA, bore Multilateral Wells vertical section, use pendulum to bore simultaneously
The well straightening instrument inclining prevention such as tool；
(2), after main borehole vertical section bores and meets xeothermic rock stratum, continue to creep into vertically downward, stop to hot dry rock reservoir；
(3) production casing under, utilizes high thermal conductivity coefficient mud to cement the well, simultaneously at shaft bottom lower packet；
(4) on hot dry rock reservoir top, utilize casing sidetracking technology, drill through multiple horizontal hole to different directions, and utilize geology
Steering tool, controls horizontal segment inclination angle and creeps into distance；
(5) in hot dry rock reservoir bottom, utilize casing sidetracking technology, drill through multiple horizontal hole to different directions, and utilize geology
Steering tool, controls horizontal segment inclination angle and creeps into distance；
(6) long horizontal well in segments volume fracturing technology is used, respectively pressure break hot dry rock reservoir top branch's well water horizontal well eye and lower part
Prop up well horizontal hole so that between horizontal hole, area fractures effectively connects up and down, is formed and takes thermal medium and the hottest friendship of reservoir
The efficient seepage channel changed；
(7) lower oil pipe in Multilateral Wells vertical section, makes oil pipe and oil jacket annular space form a circulation line；
(8) in vertical section and branch well hole junction, top, under enter to take thermal medium distributor, be distributed intelligence according to Multilateral Wells net horizontal section
Regulation and control can take the thermal medium flow at each horizontal segment；
(9) in the peupendicular hole section oil jacket annular space between upper and lower horizontal branch, under enter packer, prevent from oil jacket annular space inject taking
Thermal medium flows to bottom horizontal hole, and lower horizontal well connects the oil pipe in vertical bore, can will take heat after heating
Medium is exploited to ground by oil pipe；
(10) ground uses injection pump or compressor to inject low temperature in straight well oil jacket annular space and take thermal medium, takes thermal medium along oil jacket ring
Empty inflow upper water horizontal well section, and enter in hot dry rock reservoir；
(11) thermal medium is taken under gravitional force and injection production pressure difference effect, along the high bleed-through road of pressure break, from hot dry rock reservoir overhead stream
To reservoir bottom, take after thermal medium and hot dry rock reservoir carry out sufficient heat exchange, enter the horizontal hole of reservoir bottom,
Under the suction pump effect of ground, exploit to ground through straight well oil pipe；
(12) utilize in the face of the high temperature heat taken entrained by thermal medium out on ground.
2. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (1)
In, Multilateral Wells vertical section size is the biggest, and borehole diameter is no less than 0.3m.
3. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (2)
In, Multilateral Wells vertical section should be drilled into bottom hot dry rock reservoir as far as possible, avoids drilling hot dry rock reservoir, higher than xeothermic simultaneously
1-3m bottom rock reservoir.
4. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (3)
In, high thermal conductivity coefficient mud thermal conductivity factor is more than 50W/ (m DEG C).
5. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (4),
(5) in, when hot dry rock reservoir upper and lower drill through Multilateral Wells horizontal hole, should be according to hot dry rock reservoir distribution and geology
Situation, reasonable Arrangement horizontal hole orientation, density and length, maximize pressure break volume, plane distribution 4-8 bar horizontal well
Eye, the long 100-1000m of well.
6. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (7)
In, oil pipe is insulated tubing, can fully reduce the heat exchange between oil pipe and oil jacket annular space, to the height of extraction in oil pipe
Temperature is taken thermal medium and is played the effect of insulation.Insulated tubing thermal conductivity factor 0.05-0.2W/ (m DEG C).
7. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (10)
In, taking thermal medium can be conventional water, it is also possible to be supercritical CO2, and other have the stream of excellent heat character
Body, such as water and the compounding fluid such as ethanol or ethylene glycol.
8. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (12)
In, difference is taken thermal medium and in the heat exchange on ground and is utilized technique different, as compounding fluid has more sensitive phase-state change,
Can make to take thermal medium and become gaseous state by changing pressure, thus rapidly and efficiently discharge the heat energy carried.
9. Multilateral Wells volume fracturing self-loopa exploitation dry-hot-rock geothermal method as claimed in claim 1, it is characterised in that: step (12)
In, it is possible to use the devices such as conventional heat pump are to direct uses for geothermal energy, it is also possible to utilize double-work medium power generation technology to generate electricity,
Here preferably employ high temperature and take thermal medium generating, and the thermal medium of taking after generating is carried out multistage Waste Heat Reuse.
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| CN106703760A (en) * | 2016-12-29 | 2017-05-24 | 延安能源化工（集团）能新科油气技术工程有限公司 | Geothermal horizontal well mining system and method |
| CN106948795A (en) * | 2017-03-30 | 2017-07-14 | 中国石油大学(北京) | A kind of method that multi-branched horizontal well closed cycle develops hot water type underground heat |
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| CN107100605A (en) * | 2017-04-21 | 2017-08-29 | 中国石油大学(北京) | A kind of method that dual horizontal well circulation supercritical carbon dioxide develops hot dry rock |
| CN107130944A (en) * | 2017-07-14 | 2017-09-05 | 中国石油大学(华东) | A kind of method that utilization fluid circulation mode employs geothermal energy exploitation of gas hydrate Tibetan |
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