CN106839478A - A kind of method of construction of deep geothermal heat heat transfer root system - Google Patents
A kind of method of construction of deep geothermal heat heat transfer root system Download PDFInfo
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- CN106839478A CN106839478A CN201710050951.3A CN201710050951A CN106839478A CN 106839478 A CN106839478 A CN 106839478A CN 201710050951 A CN201710050951 A CN 201710050951A CN 106839478 A CN106839478 A CN 106839478A
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- heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
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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
Can be with the systems technology field of hot dry rock the invention belongs to deep geothermal heat, specifically disclose a kind of method of construction of deep geothermal heat heat transfer root system, the present invention combines downhole perforation and fracturing technique, thermal conducting agent is poured into fracturing fracture, brill is done to well casing after thermal conducting agent solidification and washes operation, then enter expansion tube closure perforation down, make that pipeline interior circulation medium is not permeable to be drained in the middle of stratum using expansion tube Sealing Technology, formation only takes heat and do not adopt underground water and not the interference-free hot systems of polluted underground water；After the thermal conducting agent solidification of pipeline external, geothermal well and deep geothermal heat system is set to form a kind of heat transfer root system, the Fracture System heat conduction energy of geothermal reservoir near wellbore zone is improved, conducting power of the heat energy in underground heat pressure break reservoir is improved, heat is taken in increase geothermal reservoir；The deep geothermal heat conduction-convection problem that the method for the present invention builds, is that a kind of environmentally friendly, efficient and inexpensive thermal conductive utilizes system.
Description
Technical field
Can be with the systems technology field of hot dry rock the invention belongs to deep geothermal heat, and in particular to a kind of deep geothermal heat heat transfer
The method of construction of root system.
Background technology
The relevant new energy report display of the United Nations：Global geothermal energy resources total resources, equivalent to global resources total flow
450,000 times.The decay of radioactive element is the main source of earth heat energy.The earth of motion is constantly stored up and discharges energy
Amount.It is annual to be scattered and disappeared by heat transfer, volcanic eruption, earthquake, the substantial amounts of energy of release such as hot spring.Continental crust general thickness is 30
~ 70 kilometers, geothermic gradient gradually increases from the top down, general every lower 100m, and temperature raises 3 DEG C, geothermal energy type underground heat buried depth to ground
Under thousands of rice, inside is in the absence of fluid or the high heat rock mass of only a small amount of underground fluid.Because substantial amounts of geothermal energy type underground heat is obtained
Less than effective utilization, a large amount of losses and waste of the energy are caused.
In recent years, hot dry rock causes the extensive concern of various circles of society as a kind of buried cleaning geothermal energy in underground,
But country's mid-deep strata geothermal energy production technique and immature at present, then generally obtained using twin-well pressure break infiltration recharge method in the world
Geothermal energy is taken, it is low to there is recharge rate, subterranean strata destruction, recirculated water leakage loss is lost, the defect such as water lift energy consumption is high；
Also another utilizes the singel well system of geothermal energy, and the system includes production casing and the production in production casing
Pipe；Inside-and-outside ring space is formed between production casing and production pipe.The system is operated using individual well, with high-temperature stratum contact surface
Small, the temperature after heating does not often reach requirement, and big flow is small and the low shortcoming of geothermal energy utilization rate to there is pipe resistance.
The content of the invention
In order to solve low recharge rate present in prior art, subterranean strata destruction, the mistake of recirculated water leakage loss, water lift energy consumption
Geothermal energy resources are waited caused by height, and the small grade of high-temperature stratum contact surface cannot effectively be utilized, cause a large amount of losses of the energy with
The problem of waste, the invention provides a kind of method of construction of deep geothermal heat heat transfer root system.The invention solves the problems that technology ask
Topic is achieved through the following technical solutions：
A kind of method of construction of deep geothermal heat heat transfer root system, comprises the following steps：
Step one, completion carry bore after U-shaped well under enter heat conduction production casing, between geothermal reservoir and heat conduction production casing
Filling heat-conductive well cementing of cement, by the butted part welded seal of heat conduction production casing, forms the environmentally friendly geothermal system of sealing；
Step 2, ground install perforating apparatus, by the perforating gun of perforating apparatus bring in geothermal reservoir region heat conduction produce set
Guan Zhong, opens the igniter on perforating apparatus, perforating bullet is ignited, by heat conduction production casing, the water of deep geothermal heat reservoir area
Mud layer and geothermal reservoir are shot through, and equally distributed preforation tunnel is formed on heat conduction production casing, cement layer and geothermal reservoir；
Step 3, using fracturing technology, the geothermal reservoir around perforation is produced crack under the effect of the pressure；
Step 4, thermal conducting agent is poured into fracturing fracture, brill is done to well casing after thermal conducting agent solidification and washes operation；
Step 5, bore wash after well casing under enter expansion tube closure perforation, make pipeline interior circulation using expansion tube Sealing Technology
Medium is not permeable to be drained in the middle of stratum；
Step 6, opening ground suction pump, hot fluid is taken in injection in heat conduction production casing, realizes that U-shaped well takes hot fluid circulation
Flowing.
Further, the perforation spacing is 0.05 ~ 0.2m, and perforation phase is 60 ° ~ 80 °.
Further, the length in the crack is 10 ~ 100m.
Further, the heat conduction production casing is thermal conductivity factor more than 100W/'s (m.k) and corrosion resistant steel pipe.
Further, the heat conduction cement is that density is 1.89g/cm3, cement mortar of the API dehydrations less than 100ml.
Further, the well is U-shaped well.
Compared with prior art, beneficial effects of the present invention：
The present invention combines downhole perforation and fracturing technique, and thermal conducting agent is poured into fracturing fracture, and well casing is done after thermal conducting agent solidification
Brill washes operation, and expansion tube closure perforation is then entered down, makes that pipeline interior circulation medium is not permeable to drain to ground using expansion tube Sealing Technology
In the middle of layer, formation only takes heat and does not adopt underground water and not the interference-free hot systems of polluted underground water；The thermal conducting agent of pipeline external is consolidated
After change, geothermal well and deep geothermal heat system is formed a kind of heat transfer root system, improve the crack system of geothermal reservoir near wellbore zone
System heat conduction energy, improves conducting power of the heat energy in underground heat pressure break reservoir, and heat is taken in increase geothermal reservoir；Solve existing
There are low recharge rate present in deep geothermal heat energy production technique, subterranean strata destruction, the mistake of recirculated water leakage loss, water lift high energy consumption, with
And geothermal energy resources cannot be utilized effectively caused by high-temperature stratum contact surface small grade etc., cause a large amount of losses and waste of the energy
Problem.
The deep geothermal heat conduction-convection problem that the method for the present invention builds, is that a kind of environmentally friendly, efficient and inexpensive underground heat is passed
Lead and utilize system.
Brief description of the drawings
The step of Fig. 1 is the inventive method flow chart.
Fig. 2 is the U-shaped well heat transfer root structure schematic diagram that the inventive method is built.
In figure：1st, U-shaped well water inlet pipe；2nd, U-shaped well outlet pipe；3rd, heat conduction root system.
Specific embodiment
Further detailed description is done to the present invention with reference to specific embodiment, but embodiments of the present invention are not limited to
This.
The method of construction of deep geothermal heat heat transfer root system as shown in Figure 1, comprises the following steps：
Step one, in the U-shaped well that completion is carried after boring thermal conductivity factor is added more than 100W/'s (m.k) and corrosion resistant along well track
The steel pipe of erosion, it is 1.89g/cm3 that density is injected between geothermal reservoir and steel pipe, and cement mortar of the API dehydrations less than 100ml is consolidated
Well, by the butted part welded seal of steel pipe, forms the environmentally friendly geothermal system of sealing.
Step 2, perforating apparatus are installed on ground, in bringing the perforating gun of perforating apparatus the steel pipe of geothermal reservoir region in,
The igniter on perforating apparatus is opened, perforating bullet is ignited, by the steel pipe of deep geothermal heat reservoir area, cement layer and geothermal reservoir
It is shot through, equally distributed preforation tunnel is formed on steel pipe, cement layer and geothermal reservoir；During operation, can first in the vertical of U-shaped well
Well section geothermal reservoir region perforation, then carries out reperforation by the net horizontal section that perforating gun brings U-shaped well in again.
Because shot density increases, formation fracture pressure lowers, and shot density is higher than shadow of the hole depth to fracture pressure
Ring, in order to reduce construction risk, it is 0.05 ~ 0.2m to set perforation spacing, and perforation phase is 60 ° ~ 80 °.
Step 3, using fracturing technology separate stratum fracfturing geothermal area reservoir, fracturing fluid is pressed into geothermal reservoir along preforation tunnel,
Formed along the fracturing fracture being distributed around pit shaft, build the underground heat pressure break reservoir for taking hot fluid seepage flow heat exchange；The length in crack
It is 10 ~ 100m to spend.
Step 4, thermal conducting agent is poured into fracturing fracture, deep geothermal heat reservoir is formed a kind of heat transfer after thermal conducting agent solidification
Root system, then makees brill and washes operation to well casing.
Step 5, bore wash after well casing under enter expansion tube closure perforation, made in pipeline using expansion tube Sealing Technology
Circulatory mediator is not permeable to be drained in the middle of stratum；Expansion tube Sealing Technology uses the existing technology of field of petroleum exploitation.
Step 6, opening ground suction pump, hot fluid is taken in injection in steel pipe, and taking hot fluid will be exploited by high-temperature stratum
Geothermal energy therein, realizes that U-shaped well takes hot fluid circulation flowing.
The present invention combines downhole perforation and fracturing technique（Downhole perforation and fracturing technique are showing for field of petroleum exploitation use
There is technology, do not do more detailed introduction herein）, thermal conducting agent is poured into fracturing fracture, well casing is done after thermal conducting agent solidification
Brill washes operation, expansion tube closure perforation is then entered down, using expansion tube Sealing Technology（Expansion tube Sealing Technology is also oil exploitation
In the prior art that field uses）Make that pipeline interior circulation medium is not permeable to be drained in the middle of stratum, formation only takes heat and do not adopt underground water and not
The interference-free hot systems of polluted underground water；After the thermal conducting agent solidification of pipeline external, form geothermal well and deep geothermal heat system
A kind of heat transfer root system, improves the Fracture System heat conduction energy of geothermal reservoir near wellbore zone, improves heat energy and is stored up in underground heat pressure break
Conducting power in layer, heat is taken in increase geothermal reservoir；Solve and returned present in existing deep geothermal heat energy production technique
Filling rate is low, subterranean strata destruction, recirculated water leakage loss lose, water lift high energy consumption, and the small grade of high-temperature stratum contact surface caused by etc. ground
Thermal resource cannot be utilized effectively, cause the problem of a large amount of losses and waste of the energy.
The deep geothermal heat heat transfer root system that the method according to the invention is built, it is adaptable to the U-shaped well system of underground heat exploitation, when
In a Vertical Well of U-shaped well（Water inlet pipe 3）Hot fluid is taken in middle injection（Such as water）When, when water passes through the heat accumulation rock stratum of U-shaped well,
In the presence of heat accumulation rock stratum heat conduction root system 1, the thermal conducting agent being distributed in all root systems can be by the warm of the geothermal reservoir of deeper
In amount conduction to the water in steel pipe, water is heated rapidly, heated water is along another Vertical Well（Outlet pipe 2）It is sucked up to ground
Terrestrial cells are heated or carry out other heat utilizations by face in the heating cycle system of ground surface end；Overheated through ground circulation
The water of exchange carries out heat transfer again by Vertical Well into deep geothermal heat heat transfer root system system, and being constituted circulated heat with this passes
Delivery system.
U-shaped well depth in the method for the present invention is about 3000 meters, and deep geothermal heat conduction root system is located at 2000-3000 meters
In xeothermic rock stratum, the fluid in well can be heated to 60 DEG C ~ 150 DEG C by single U-shaped well area of heat-supply service up to 7~100,000 square metres,
Life-span is 50 years, and its running cost is far below the operation of the heating systems such as municipal heat supply, natural gas, deep earth source heat pump
Expense.Therefore, the deep geothermal heat conduction-convection problem that the method for the present invention builds, is a kind of environmentally friendly, efficient and inexpensive underground heat
Conduction utilizes system.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Specific implementation of the invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should be all considered as belonging to of the invention
Protection domain.
Claims (5)
1. a kind of method of construction of deep geothermal heat heat transfer root system, it is characterised in that：Comprise the following steps：
Step one, completion carry bore after U-shaped well under enter heat conduction production casing, between geothermal reservoir and heat conduction production casing
Filling heat-conductive well cementing of cement, by the butted part welded seal of heat conduction production casing, forms the environmentally friendly geothermal system of sealing；
Step 2, ground install perforating apparatus, by the perforating gun of perforating apparatus bring in geothermal reservoir region heat conduction produce set
Guan Zhong, opens the igniter on perforating apparatus, perforating bullet is ignited, by heat conduction production casing, the water of deep geothermal heat reservoir area
Mud layer and geothermal reservoir are shot through, and equally distributed preforation tunnel is formed on heat conduction production casing, cement layer and geothermal reservoir；
Step 3, using fracturing technology, the geothermal reservoir around perforation is produced cracks under the effect of the pressure；
Step 4, thermal conducting agent is poured into fracturing fracture, brill is done to well casing after thermal conducting agent solidification and washes operation；
Step 5, bore wash after well casing under enter expansion tube closure perforation, make pipeline interior circulation using expansion tube Sealing Technology
Medium is not permeable to be drained in the middle of stratum；
Step 6, opening ground suction pump, hot fluid is taken in injection in heat conduction production casing, realizes that U-shaped well takes hot fluid circulation
Flowing.
2. method of construction according to claim 1, it is characterised in that：The perforation spacing is 0.05 ~ 0.2m, perforation phase
It is 60 ° ~ 80 °.
3. method of construction according to claim 2, it is characterised in that：The length in the crack is 10 ~ 100m.
4. method of construction according to claim 3, it is characterised in that：The heat conduction production casing is more than for thermal conductivity factor
100W/'s (m.k) and corrosion resistant steel pipe.
5. method of construction according to claim 1, it is characterised in that：The heat conduction cement is that density is 1.89g/cm3,
Cement mortar of the API dehydrations less than 100ml.
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| CN201710050951.3A CN106839478A (en) | 2017-01-23 | 2017-01-23 | A kind of method of construction of deep geothermal heat heat transfer root system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278787A (en) * | 2018-01-04 | 2018-07-13 | 河北绿源地热能开发有限公司 | A kind of high efficiency of energy based on geothermal exploitation well utilizes winning apparatus and method |
| CN109721303A (en) * | 2019-01-03 | 2019-05-07 | 中国煤炭地质总局水文地质局 | A kind of well cementing material and geothermal well of mid-deep strata geothermal well |
| CN109779529A (en) * | 2019-01-03 | 2019-05-21 | 中国煤炭地质总局水文地质局 | A kind of geothermal well drill construction technique and geothermal well |
| CN110318662A (en) * | 2019-07-10 | 2019-10-11 | 台州长天能源技术有限公司 | Gravity head beats U-shaped well method device product |
| 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 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278787A (en) * | 2018-01-04 | 2018-07-13 | 河北绿源地热能开发有限公司 | A kind of high efficiency of energy based on geothermal exploitation well utilizes winning apparatus and method |
| CN109721303A (en) * | 2019-01-03 | 2019-05-07 | 中国煤炭地质总局水文地质局 | A kind of well cementing material and geothermal well of mid-deep strata geothermal well |
| CN109779529A (en) * | 2019-01-03 | 2019-05-21 | 中国煤炭地质总局水文地质局 | A kind of geothermal well drill construction technique and geothermal well |
| 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 |
| CN110318662A (en) * | 2019-07-10 | 2019-10-11 | 台州长天能源技术有限公司 | Gravity head beats U-shaped well method device product |
| CN110318662B (en) * | 2019-07-10 | 2023-12-19 | 台州长天能源技术有限公司 | Gravity head U-shaped well drilling method and equipment product |
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