CN207063968U - A kind of two wells connection circulates enhanced underground heat completion system - Google Patents
A kind of two wells connection circulates enhanced underground heat completion system Download PDFInfo
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- CN207063968U CN207063968U CN201720213713.5U CN201720213713U CN207063968U CN 207063968 U CN207063968 U CN 207063968U CN 201720213713 U CN201720213713 U CN 201720213713U CN 207063968 U CN207063968 U CN 207063968U
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- water
- well
- protective casing
- water injection
- injection well
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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
It the utility model is related to a kind of two wells connection and circulate enhanced underground heat completion system, its feature is：By injecting water in water injection well; water carries out poorly efficient heat exchange in water injection well straight well section; then enter geothermal reservoir along horizontal heat-collection well; water adopts hot well with geothermal reservoir by entering after the fully efficient heat exchange of high temperature resistant sleeve pipe progress; after the heat-barrier coating that high-temperature-hot-water scribbles heat-barrier material by adopting protective casing inside and outside in hot well is formed; ground is produced, extraction hot water is used to generate electricity.
Description
Technical field
It the utility model is related to underground heat production technique field, and in particular to a kind of two wells connection circulates enhanced underground heat completion
System.
Background technology
Resource and environment is the primary condition that the mankind depend on for existence, multiply and developed, and resource environment and sustainable development are
As the significant problem of mankind's facing.Since a nearly century, global population increases 2 times, the energy and naturally money
The consumption in source increases 10 times, and the utilization to non-renewable energy resources is well beyond the ability that environment can bear, air
Pollution and the living environment of the global warming serious threat mankind, geothermal energy resources as a kind of regenerative resource of cleanliness without any pollution,
In today that people's environmental consciousness is increasingly stronger, also receive more and more attention.
Geothermal energy resources refer under current techniques economy and geological conditions, can be from earth's crust clinical practice, reasonably open
The useful constituent of heat in heat, geothermal fluid and its association in the High temperature rocks issued.The earth is one huge
Thermal store, from ground, more down temperature is higher, and normal geothermal gradient is to increase by 20 DEG C or so per 1000m, when surface temperature is 10
DEG C when, in the case of normal geothermal gradient, formation temperature is about 90 DEG C at the 4000m of underground.Due to constructing reason, the whole world is differently
The geothermal gradient difference in area is larger so that the formation temperature difference of the same depth of different regions is larger, the ground temperature of some areas
Gradient just forms high-temperature geothermal reservoir when being more than normal geothermal gradient, there are many area formation temperatures at the 4000m of underground in the whole world
Abnormal high temperature geothermal reservoir is formed more than 200 DEG C, the energy storage stores very high heat, i.e. referred to as geothermal energy.China
Thermal resource enriches, and market potential is huge, and development prospect is wide.Speeding up development using geothermal energy resources not only to readjusting the energy structure,
Energy-saving and emission-reduction, improvement environment are significant.To implement《Renewable Energy Law》, according to《Renewable Energy Development " 13
Five " planning》, formulate《Geothermal energy development utilizes " 13 " planning》, plan and elaborate the guidance side that geothermal energy development utilizes
Pin and target, key task, great layout, and safeguard of planning implementation etc., the planning are " 13 " period China
The basic foundation that geothermal energy development utilizes.
Geothermal energy is divided into hot water type underground heat and xeothermic lithotype underground heat, and hot water type underground heat is that have high-temperature-hot-water in subsurface reservoir,
Xeothermic lithotype underground heat is that subsurface reservoir is High temperature rocks, and the world exploits and is mainly hot water type underground heat using geothermal energy resources at present,
I.e. from ground drilling to high-temperature geothermal reservoir, geothermal water is then produced into ground and generated electricity, xeothermic lithotype is from ground by water
Underground is injected into, by absorbing heat water body after being contacted with High temperature rocks, then high temperature water body, which returns, is discharged to ground to generate electricity,
The system is referred to as enhanced geothermal system, Future potentiality it is bigger be xeothermic lithotype underground heat exploitation, i.e., enhanced underground heat
Electricity generation system.
The enhanced existing development scheme of geothermal system is：In the area with geothermal energy reservoir, on ground at a distance of 1000
Then two positions of rice carry out pressure break, by reservoir simultaneously to two mouthfuls of wells of underground drilling in Liang Koujing underground geothermal reservoir position
Rock is pressed into crack, and the crack of two mouthfuls of well pressure breaks is connected, two mouthfuls of wells is connected by the crack of pressure break in underground, then passes through
A bite well absorbs heat to ground high-pressure pump to ground bet normal-temperature water, water by temperature reservoirs flow in fracture therefrom, then
Hot water is generated electricity from another mouthful of well extraction to ground.But deficiency existing for the system is：Need to carry out pressure break after boring two mouthfuls of wells,
The pressure break expense of 1000m length probably needs 6,000,000, the somewhat expensive of pressure break, adds development cost.
Analysis based on more than, the development cost of geothermal energy are high, if it is possible to which researching and developing a set of needs to bung down together
When do not need pressure break mode just can mining geothermal energy technology, development cost can be substantially reduced.Analyzed based on more than, this practicality is new
A kind of two wells connection of type Patent design circulates enhanced underground heat completion system, it is intended to it is unified in enhanced geothermal system to fill up China
Kind two wells connection circulates the vacancy of enhanced underground heat completion system, and compared with existing development scheme, the system only needs to bore two mouthfuls
Well head well is docked, and geothermal energy is absorbed by the circulation of water body, and underground heat is reduced by the design of the development system
Energy development cost, to realize safe efficient, sustainable, the inexpensive development and utilization to geothermal energy.
Utility model content
The purpose of this utility model is to provide a kind of two wells connection circulation enhancing into well for the exploitation of enhanced geothermal system
Type underground heat completion system, to improve the high efficiency of exploitation of geothermal resource, security, sustainability.
In order to achieve the above object, the utility model adopts the following technical scheme that：
A kind of two wells connection circulates enhanced underground heat completion system, mainly by water injection well and water acquisition well construction, by water injection well,
Water acquisition well connects to form U-shaped casing programme, and water acquisition well well type is straight well, and water injection well well type is horizontal well, water injection well casing programme
Including straight well section and horizontal segment；Before drilling well, it is necessary in the selection of previously selected geothermal reservoir top at a distance of the two of 2000m
Point, as water injection well, the geographical coordinates of water acquisition well；Then to underground subdrilling a bite water acquisition well to geothermal reservoir, water filling is then bored
Well, in water injection well drilling process, straight well section is first drilled to, straight well section reaches in geothermal reservoir, horizontal segment is then bored, until getting into
Position of the water acquisition well in geothermal reservoir, the horizontal segment of water injection well drill the straight well section of water acquisition well, realize the connection of two mouthfuls of wells, water
Flat segment length is 2000m.Bored in geothermal reservoir before water injection well horizontal segment, it is necessary to which that magnetic steering instrument is lowered into water injection well is straight
Well section bottom, the magnetic steering instrument play a part of orientation, that is, guide brill chance water acquisition well in water injection well horizontal segment drilling process to exist
Position in geothermal reservoir.
U-shaped casing programme is formed after water injection well, the connection of water acquisition well, then injects normal-temperature water from water injection well, water is from water injection well
Straight well section protective casing flows to horizontal segment protective casing, because horizontal segment protective casing is in geothermal reservoir, geothermal reservoir heat
Endlessly it is delivered in protective casing, heat is absorbed when water flows in the horizontal segment protective casing and becomes high-temperature water, so
High-temperature water flows to water acquisition well protective casing from horizontal segment protective casing afterwards, and then flowing to ground from water acquisition well protective casing is sent out
Electricity.
The protective casing of water injection well horizontal segment described in the utility model size is more than water acquisition underground portion protective casing size, should
Design water injection well horizontal segment protective casing size is larger, and water flowing velocity in large-sized horizontal segment protective casing is slower, water
Flowing time in the protective casing is longer, i.e. the time of water absorption geothermal reservoir heat is just longer, and heat transfer effect is more
Good, water temperature becomes higher, and generating efficiency is more preferable after hot water reaches ground.
The protective casing of water acquisition well described in the utility model is divided into top protective casing and bottom protective casing, and water acquisition well
Bottom protective casing size is less than water acquisition well top protective casing size, be because high-temperature-hot-water in water acquisition well protective casing from
Under when flowing up, due to pressure action, in water acquisition underground portion protective casing in the pressure ratio top protective casing of water water pressure
Power is big, because the three-phase of water is determined by the temperature and pressure of water, when the timing of temperature one of water, the pressure that water is subject to are larger
When be liquid, be changed into gaseous state when reverse pressure is smaller, therefore, the high-temperature-hot-water in water acquisition well protective casing is in bottom protective casing
Pressure is big during place, is liquid, and pressure is small when at the protective casing of top, and aqueous water becomes gaseous state.Aqueous water becomes body after gaseous state
Product expansion, pressure increase, it is possible to the protective casing for ruining top can be squeezed, is ruined in order to avoid well top protective casing is not squeezed,
So increase top protective casing size, buffering aqueous water becomes the pressure that volumetric expansion after gaseous state is brought.
Water injection well straight well section protective casing is different from water injection well horizontal segment protective casing size, can be formed in the reducer
Current are hoarded, and row buffering is flowed into water, it is miscellaneous can will not to inject air etc. on the premise of ensureing that injection flow, pressure are constant
Matter, air take heat transfer space in water injection well horizontal segment protective casing, influence heat-transfer effect.
Brief description of the drawings
Accompanying drawing 1 is cross-sectional view of the present utility model.
1 water injection well straight well section, 2 water injection well horizontal segments, 3 water acquisition wells, 4 water injection well surface pipes, 5 water injection well straight well section technologies
Sleeve pipe, 6 water injection well horizontal segment protective casings, 7 water acquisition well top protective casings, 8 water acquisition underground portion protective casings, 9 water acquisition well tables
Layer sleeve pipe.
Embodiment
Below in conjunction with accompanying drawing 1, the utility model is described in detail, it is as follows：
A kind of main 1 water injection well straight well section of the enhanced underground heat completion system of two wells connection circulation, 2 water injection well horizontal segments, 3 are adopted
Well, 4 water injection well surface pipes, 5 water injection well straight well section protective casings, 6 water injection well horizontal segment protective casings, 7 water acquisition well tops
Protective casing, 8 water acquisition underground portion protective casings, 9 water acquisition well surface pipes composition.
The utility model is in the case where the parameters such as geothermal reservoir geographical position, orientation, depth determine, in geothermal reservoir
A bite straight well, as water acquisition well 3 are bored in top first, and the well type of water acquisition well 3 is straight well, is spudded in first by 374.4mm drill bits, under
Enter 272.8mm surface pipes 9 and cementing well, it is therefore an objective to isolate top layer complicated geological structure；Then using the resistance to of 250.6mm
High temperature drill bit is drilled into geothermal reservoir, then the water acquisition underground portion of the large-sized water acquisition well top protective casing 7 of tripping in and small size
Protective casing 8, and shunt in a well after cementing well.
During water injection well drilling well, water injection well straight well section 1 gets into geothermal reservoir, and the well type of water injection well is horizontal well, is sequentially note
Well straight well section 1, water injection well horizontal segment 2, pit shaft and stratum heat exchange area, water filling well water can fully be increased using horizontal well technology
The length of flat section 2 is more than 2000m.During 1 drilling well of water injection well, spudded in first by 444.2mm drill bits, subsequent tripping in 406.1mm
Water injection well surface pipe 4 and cementing well, isolate stratum top layer complicated geological structure；Secondly it is drilled into using 374.4mm drill bits
Geothermal reservoir kickoff point (KOP), tripping in water injection well straight well section protective casing 5 are simultaneously cemented the well；Then using 250.6mm drill bits and high temperature resistant magnetic
Guide instrument directional inclination.
Water injection well straight well section protective casing 5 is different from water injection well horizontal segment 6 sizes of protective casing, is formed in the reducer
Current are hoarded, and row buffering is flowed into water, can will not inject the impurity such as air, air exists on the premise of guarantee flow, pressure
Heat transfer space is taken in water injection well horizontal segment protective casing 6, influences heat-transfer effect.
When boring water injection well horizontal segment 2, it is oriented by high temperature resistant magnetic steering instrument, controls drill bit in real time in geothermal reservoir
The direction of middle drilling, until water injection well horizontal segment 2 reaches position of the water acquisition well 3 in geothermal reservoir, water injection well horizontal segment 2 bores
Water acquisition underground portion protective casing 8 is worn, realizes the connection of two mouthfuls of wells.
A kind of two wells connection circulates enhanced underground heat completion system by injecting normal-temperature water from water injection well straight well section 1, water from
Water injection well straight well section protective casing 5 flows to water injection well horizontal segment protective casing 6, because water injection well horizontal segment protective casing 6 is on ground
In heat reservori, geothermal reservoir heat is endlessly delivered to water injection well horizontal segment protective casing 6, and water is in water injection well horizontal segment skill
Heat is absorbed when being flowed in art sleeve pipe 6 and becomes high-temperature water, then high-temperature water flows to water acquisition from water injection well horizontal segment protective casing 6
Underground portion protective casing 8, then high temperature flow to ground from water acquisition well top protective casing 7 and generated electricity.
Claims (3)
1. a kind of two wells connection circulates enhanced underground heat completion system, mainly by water injection well, water acquisition well construction, it is characterised in that：
The water injection well is made up of water injection well surface pipe, water injection well straight well section protective casing, water injection well horizontal segment protective casing, three kinds
Sleeve pipe is sequentially connected from top to bottom；The water acquisition well is by water acquisition well surface pipe, water acquisition well top protective casing, water acquisition underground portion
Protective casing is formed, and three kinds of sleeve pipes are sequentially connected from top to bottom；Completion casing programme connected by water injection well with water acquisition well formed it is U-shaped
Casing programme.
2. a kind of two wells connection according to claim 1 circulates enhanced underground heat completion system, it is characterised in that：Water injection well
Horizontal segment protective casing size is more than water acquisition underground portion protective casing size.
3. a kind of two wells connection according to claim 1 circulates enhanced underground heat completion system, it is characterised in that：Water acquisition well
Bottom protective casing size is less than water acquisition well top protective casing size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720213713.5U CN207063968U (en) | 2017-03-06 | 2017-03-06 | A kind of two wells connection circulates enhanced underground heat completion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720213713.5U CN207063968U (en) | 2017-03-06 | 2017-03-06 | A kind of two wells connection circulates enhanced underground heat completion system |
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| Publication Number | Publication Date |
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| CN207063968U true CN207063968U (en) | 2018-03-02 |
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| CN201720213713.5U Expired - Fee Related CN207063968U (en) | 2017-03-06 | 2017-03-06 | A kind of two wells connection circulates enhanced underground heat completion system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775275A (en) * | 2018-05-28 | 2018-11-09 | 中国石油大学(华东) | Individual well closed cycle underground thermoelectric heat generation system and method |
| CN108799024A (en) * | 2018-05-28 | 2018-11-13 | 中国石油大学(华东) | U-tube heat exchange closed cycle underground thermoelectric heat generation system and method |
| 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 |
-
2017
- 2017-03-06 CN CN201720213713.5U patent/CN207063968U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775275A (en) * | 2018-05-28 | 2018-11-09 | 中国石油大学(华东) | Individual well closed cycle underground thermoelectric heat generation system and method |
| CN108799024A (en) * | 2018-05-28 | 2018-11-13 | 中国石油大学(华东) | U-tube heat exchange closed cycle underground thermoelectric heat generation system and method |
| 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 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180302 Termination date: 20190306 |