CN208010325U - A kind of underground multiloop heat exchange geothermal well - Google Patents
A kind of underground multiloop heat exchange geothermal well Download PDFInfo
- Publication number
- CN208010325U CN208010325U CN201820370444.8U CN201820370444U CN208010325U CN 208010325 U CN208010325 U CN 208010325U CN 201820370444 U CN201820370444 U CN 201820370444U CN 208010325 U CN208010325 U CN 208010325U
- Authority
- CN
- China
- Prior art keywords
- well
- water
- heat exchange
- heat
- water injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Road Paving Structures (AREA)
Abstract
The utility model discloses a kind of underground multiloop heat exchange geothermal wells, including water injection well, water acquisition well, several heat exchange Multilateral Wells for being connected to water injection well and water acquisition well, the heat exchange Multilateral Wells are horizontal bare hole well, water injection well and water acquisition bottom setting shaft bottom block seat, central water flooding pipe is fixed with by well casing packer in water injection well, its bottom end is located at bottom heat exchange Multilateral Wells, and a well casing packer packing is arranged every well casing at interval of two heat exchange Multilateral Wells in water injection well；Center water gathering tube is arranged by well casing packer in water acquisition well, bottom end is located above the wellbore of heat exchange of top part Multilateral Wells, and exchange heat from below heat exchange of top part lateral wellbore every two lateral wellbore setting down-hole plugging device in water acquisition well；Water injection well, well casing packer, heat exchange Multilateral Wells, water acquisition well and down-hole plugging device form " S " type heat-exchanging loop in underground.The utility model is controlled heat exchange, is improved the heat utilization rate of hot dry rock using fixed point injection way, " S " type heat-exchanging loop.
Description
Technical field
The utility model is related to dry-hot-rock geothermals to take technical field, more particularly to a kind of underground multiloop heat exchange underground heat
Well.
Background technology
Hot dry rock refers to that buried depth is more than the underground high heat rock mass that 2000m, temperature are more than 150 DEG C, its main feature is that in rock mass very
Rare underground fluid exists.The thermal energy preservation of hot dry rock is in various metamorphic rocks or CRYSTALLINE ROCKS class rock mass, more typical hot dry rock
There are biotite gneissic rock, granite, granodiorite etc..General temperature is more than the presence of 150 DEG C of underground high heat rock mass, centainly
Prodigious exception can be brought to the ground temperature environment of surrounding, so many researchers also abnormal study whether geothermal gradient is super
Underground whether there is dry-heat rock body.
Currently, utilization of the people to hot dry rock, mainly generate electricity.Hot dry rock power generation basic principle be：Pass through depth
High pressure water is injected the rock stratum of 2000~6000m of underground by well, so that it is penetrated into the gap of rock stratum and is absorbed geothermal energy；Lead to again
Cross another special deep-well（At a distance of about 200~600m or so）High-temperature water, stripping in rock fracture is got into ground；It takes out
Water, stripping temperature are up to 150~200 DEG C, by heat exchange and ground circulator for generating electricity；Water after cooling is again by height
Press pump injects earth tube heat exchanger and recycles.Water penetrates into the gap of rock stratum by deep well injection underground dry-heat rock body
And absorb geothermal energy, i.e., heat exchange, including Three models are formed in dry-heat rock body：
1. artificial high pressure crack pattern：I.e. by artificial high pressure water injection to shaft bottom, xeothermic rock is acted on shape by water cooling contracting
At many cracks, water passes through between these cracks, you can completes the water circulation system heat exchange that inlet well and wet well are formed
Process；
2. natural fissure pattern：Make full use of the existing Fracture Networks in underground.Although on the one hand existing crack prevents
The development in artificial high pressure water injection crack, but then when artificial recharge, original crack can broaden or misplace bigger, increase
Water penetration between strong crack.In such a mode, can carry out the water bigger of heat exchange, and heat exchange obtain it is more abundant；
3. natural fissure-fault pattern：This pattern is in addition to using the natural crack in underground, also utilizing natural tomography
System, the superposition of the two is so that the permeability of heat-exchange system is more preferable.The sharpest edges of the pattern are also the largest challenge, i.e.,
It is not required to connect inlet well and wet well by way of artificial high pressure crack, but is located to connect by already existing tomography
Fissure system between inlet well and wet well.
The exploitation of hot dry rock mainly establishes earth tube heat exchanger, and above-mentioned artificial high pressure crack pattern, natural fissure
Pattern, natural fissure-fault pattern, need the understanding for having height to underground geological conditions, and engineering risk is big, drilling success rate
It is difficult to control.Since the thermal energy preservation of hot dry rock is in various metamorphic rocks or the rock mass of CRYSTALLINE ROCKS class high intensity（Biotite gneissic rock,
Granite, granodiorite etc.）In, the cost of artificial fracturing connection is big, and success rate is also difficult to control.
Utility model content
Place in view of the shortcomings of the prior art, the purpose of this utility model is to provide a kind of heat exchange of underground multiloop
Geothermal well improves injection water and geothermal reservoir contact area and time of contact, and pinpoints water filling work using the central tube of water injection well
Skill controls heat exchanger effectiveness, compared with using self-open connection, artificial fracturing connection, increases engineering operability, improves
The rate of geothermal utilization of heat reservori.
The purpose of this utility model is achieved through the following technical solutions：
A kind of underground multiloop heat exchange geothermal well, including water injection well, water acquisition well, connection water injection well and the several of water acquisition well change
Hot Multilateral Wells, the heat exchange Multilateral Wells are horizontal or oblique straight open hole well, and the water injection well and water acquisition bottom setting shaft bottom block
, central water flooding pipe is fixedly installed by well casing packer in the water injection well, central water flooding tube bottom end is changed positioned at bottom
At the wellbore of hot Multilateral Wells, and underground is fixed on by well casing packer, at interval of two heat exchange Multilateral Wells in the water injection well
One well casing packer fixed center water injection pipe of setting simultaneously insulates well casing；Center is arranged by well casing packer in the water acquisition well
Water gathering tube, center water gathering tube bottom end are located above the wellbore of heat exchange of top part Multilateral Wells, from heat exchange of top part in the water acquisition well
The lateral wellbore that exchanges heat every two is played below lateral wellbore, and down-hole plugging device is set；The water injection well, changes well casing packer
Hot Multilateral Wells, water acquisition well and down-hole plugging device form " S " type heat-exchanging loop in underground.
Further, the water injection well, water acquisition well the borehole wall be provided with heat insulation layer.
Preferably, the material of the well casing packer and down-hole plugging device is heat-barrier material.
The utility model compared with the prior art, has the following advantages and advantageous effect：
The utility model can reduce Geological Prediction risk, reduce pressure break risk, using controllable engineering construction method,
Achieve the purpose that heat exchange, and propose fixed point injection way, controls heat exchanger effectiveness, increase engineering operability, improve ground
The utilization rate of thermal energy.
Description of the drawings
Fig. 1 is the three heat exchange Multilateral Wells structural schematic diagrams of the utility model.
Wherein：1, geothermal reservoir；2, water injection well；3, water acquisition well；4, central water flooding pipe；5, center water gathering tube；6, well casing seals
Every device；7, down-hole plugging device；8, shaft bottom blocks seat；9, first level well；10, the second horizontal well；11, third horizontal well；12, well
Mouth seat；13, heat insulation layer.
Specific implementation mode
With reference to using three heat exchange Multilateral Wells as embodiment, the utility model is described in further detail, but this reality
It is without being limited thereto with novel embodiment.
Embodiment
As shown in Figure 1, to realize the underground multiloop heat exchange geothermal well of the utility model, constructed using following steps real
It is existing：
Step1, several geology prospect pits are opened up in construction area, to the formation temperature and rock of the geothermal reservoir 1 of underground heat accumulation
Property information is acquired；
Step2, according to the lithological informations such as the formation temperature and porosity of the geothermal reservoir collected in Step1, rock strength
Calculate the spacing of water injection well and water acquisition well, and the horizontal well borehole diameter of connection water injection well and water acquisition well；
Step3, water injection well 2 and water acquisition well 3 are drilled through to 1 bottom of geothermal reservoir, tripping according to the result of above-mentioned steps respectively
Shaft bottom blocks seat 8；
Step4, the thermal energy according to geothermal reservoir 1 and exploitation target, determine the number of the heat exchange Multilateral Wells in geothermal reservoir 1
Amount, sidetracking first level well 9, the second horizontal well 10 and third horizontal well 11 in water injection well 2, and by first level well 9, second
Horizontal well 10 and third horizontal well 11 are docked and connected with water acquisition well 3, concrete well cementation are carried out to water injection well 2 and water acquisition well 3, in well
Lower setting heat insulation layer 13 is simultaneously fixed in well head setting wellhead receptacle 12；
Step5, in water injection well 2 above tripping in central water flooding pipe 4 to the wellbore of first level well 9, with well casing packer 6
It is fixed, later well casing packer 6 is set in water injection well 2 above the wellbore of third horizontal well 11 and completes to center water injection pipe 4
Installation；
Step6, in water acquisition well 3, well is set between 11 wellbore of wellbore and third horizontal well of the second horizontal well 10
Lower plugging device 7；
Step7, it above tripping in center water gathering tube 5 to 11 wellbore of third horizontal well, is then insulated with well casing in water acquisition well 3
Device 6 is fixed；
Step8, heat transferring medium is injected to 2 bottom of water injection well by central water flooding pipe 4, heat transferring medium is in water injection well 2, water acquisition
It is formed between well 3, first level well 9, the second horizontal well 10, third horizontal well 11 and down-hole plugging device 7, well casing packer 6
It is flowed in serpentine circuit and completes heat exchange with geothermal reservoir 1, passed through center water gathering tube 5 later and extract out.
In conclusion description through this embodiment, can make those skilled in the art preferably implement this programme.
Claims (3)
- The geothermal well 1. a kind of underground multiloop exchanges heat, including water injection well, water acquisition well, several heat exchange for being connected to water injection well and water acquisition well Multilateral Wells, it is characterised in that：The heat exchange Multilateral Wells are horizontal bare hole well, and the water injection well and water acquisition bottom setting shaft bottom are sealed Central water flooding pipe is fixedly installed by well casing packer in the water injection well in block, and central water flooding tube bottom end is located at bottom At the wellbore for the Multilateral Wells that exchange heat, and underground is fixed on by well casing packer, at interval of two heat exchange branches in the water injection well Well is arranged a well casing packer fixed center water injection pipe and insulates well casing；Center water gathering tube is arranged by well casing packer in the water acquisition well, center water gathering tube bottom end is positioned at heat exchange of top part point Above the wellbore of Zhi Jing, exchange heat from below heat exchange of top part lateral wellbore every two lateral wellbore in the water acquisition well Down-hole plugging device is set；The water injection well, well casing packer, heat exchange Multilateral Wells, water acquisition well and down-hole plugging device form " S " type in underground and exchange heat back Road.
- The geothermal well 2. a kind of underground multiloop according to claim 1 exchanges heat, it is characterised in that：The water injection well, water acquisition The borehole wall of well is provided with heat insulation layer.
- The geothermal well 3. a kind of underground multiloop according to claim 1 exchanges heat, it is characterised in that：The well casing packer and The material of down-hole plugging device is heat-barrier material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820370444.8U CN208010325U (en) | 2018-03-19 | 2018-03-19 | A kind of underground multiloop heat exchange geothermal well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820370444.8U CN208010325U (en) | 2018-03-19 | 2018-03-19 | A kind of underground multiloop heat exchange geothermal well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208010325U true CN208010325U (en) | 2018-10-26 |
Family
ID=63889570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820370444.8U Active CN208010325U (en) | 2018-03-19 | 2018-03-19 | A kind of underground multiloop heat exchange geothermal well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208010325U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810105A (en) * | 2020-07-16 | 2020-10-23 | 中国矿业大学 | Method for building artificial heat storage by using regional fractured dry hot rock |
-
2018
- 2018-03-19 CN CN201820370444.8U patent/CN208010325U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810105A (en) * | 2020-07-16 | 2020-10-23 | 中国矿业大学 | Method for building artificial heat storage by using regional fractured dry hot rock |
| CN111810105B (en) * | 2020-07-16 | 2021-05-14 | 中国矿业大学 | Method for building artificial heat storage by using regional fractured dry hot rock |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106948795B (en) | A kind of method of multi-branched horizontal well closed cycle exploitation hot water type underground heat | |
| CN110318675B (en) | Deep coal bed gas thermal co-production method | |
| CN102852496B (en) | Medium-deep heavy oil reservoir exploitation method | |
| CN105863568A (en) | Method for exploring dry-hot-rock geotherm through underground heat siphon self-circulation | |
| CN208966316U (en) | U-shaped horizontal well | |
| CN103362442B (en) | Drilling well multiple spot communication loop gathers geothermal method | |
| CN105909214A (en) | Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure | |
| CN105863569A (en) | Single-well fracture gravity self-circulation dry-hot-rock geotherm mining method | |
| CN103225497B (en) | Exploitation method for microwave in-situ vaporization of formation water and displacement of thick oil | |
| CN101629485A (en) | Exploitation method of communication well of geothermal energy bore well | |
| CN104633996B (en) | Water source heat pump recharging technical method | |
| CN108489124A (en) | Multiloop heat-exchange method under a kind of geothermal well | |
| CN204252967U (en) | Hot dry rock multi cycle heating system | |
| CN206478882U (en) | A kind of U-shaped well deep geothermal heat conduction-convection problem | |
| CN106640028A (en) | Completion method of enhanced geothermal system through communication and circulation of two wells | |
| CN206419171U (en) | A kind of geothermal exploitation system | |
| CN106194122A (en) | The method that a kind of oil field abandoned well transform geothermal well or sub-salt well as | |
| US20230045716A1 (en) | Exploiting geothermal energy through heat recovery by circulating working fluid in purpose-built system of multilateral wells | |
| CN106968661A (en) | It is a kind of to strengthen the completion method of hot water type geothermal system | |
| CN109826595A (en) | A kind of multipotency joint hot dry rock energy storage heating system | |
| CN106839478A (en) | A kind of method of construction of deep geothermal heat heat transfer root system | |
| CN111022014A (en) | Method for developing hot dry rock resources by utilizing gravity drainage technology | |
| CN110657594A (en) | Closed circulation deep geothermal energy exploitation system | |
| CN112524829A (en) | Heat exchange working medium recyclable same-well heat recovery method | |
| CN112502687A (en) | Artificial heat storage construction system and method for group-hole dry hot rock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |