CN107166137A - Geothermal well double-layered vacuum heat-insulation structure and its application method - Google Patents
Geothermal well double-layered vacuum heat-insulation structure and its application method Download PDFInfo
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- CN107166137A CN107166137A CN201710542031.3A CN201710542031A CN107166137A CN 107166137 A CN107166137 A CN 107166137A CN 201710542031 A CN201710542031 A CN 201710542031A CN 107166137 A CN107166137 A CN 107166137A
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- inner tube
- pipe nipple
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- vacuum heat
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- 238000009413 insulation Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 59
- 210000002445 nipple Anatomy 0.000 claims description 102
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 241000269793 Cryothenia peninsulae Species 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000012545 processing Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
-
- 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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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The present invention is a kind of geothermal well double-layered vacuum heat-insulation structure and its application method, geothermal well double-layered vacuum heat-insulation structure include inner chamber axially through outer tube structure, the top of outer tube structure is removedly sealedly connected with Vacuuming structure, the bottom of outer tube structure, which is removedly sealed, is provided with underseal plug, coaxial sleeve is provided with energy axial restraint in outer tube structure, and inner chamber axially through inner tube structure, the length dimension of inner tube structure is more than the length of outer tube structure, the top sealing of inner tube structure is worn by Vacuuming structure, the downward contact of bottom energy of inner tube structure, which is opened to seal after underseal plug, to be worn by outer tube structure, the vacuum heat-insulating layer for the sealed bottom that top is connected with Vacuuming structure can be constituted between the inwall of outer tube structure and the outer wall of inner tube structure.The structure and its application method can during backwater heat-insulation and heat-preservation, heat loss is reduced to greatest extent, it is safe, effectively improve economic benefit.
Description
Technical field
The present invention relates to underground heat production technique field, more particularly to a kind of geothermal well double-layered vacuum heat-insulation structure and its use
Method.
Background technology
Since 21 century, with Chinese society rapid economic development, the aggravation of energy supply and demand contradiction, energy resource structure
The need for adjustment and energy-saving and emission-reduction and environmental protection, the exploitation of regenerative resource are increasingly subject to the attention of the whole society.Ground
Heat energy is as one kind cleaning, free of contamination alternative energy source, to alleviating energy supply pressure, improving the ecological environment that it is important to play
Effect.Therefore, the speed for accelerating exploitation and utilization of geotherm resources is imperative.
Direct water acquisition takes heat to be a kind of current most efficient geothermal exploitation mode, but a large amount of extraction of underground water can trigger
The problems such as level of ground water decline and surface subsidence, it is necessary to which tail water is passed through into injection well recharge to geothermal reservoir.Due to reservoir properties
Limitation, direct water acquisition takes heat to there is the problem of tail water recharge is difficult, and not yet large-scale promotion is utilized.
In order to ensure the Sustainable Development and Utilization of geothermal energy resources, the system of economic benefit, social benefit and environmental benefit is realized
One, last century proposes the geothermal exploitation mode of " taking heat not fetch water ", i.e., inject cold water in oil jacket annular space, pass through the continuous of water
Flowing, forms heat convection, at shaft bottom, water temperature reaches highest, is returned by oil pipe and is discharged to ground with high ambient temperatures stratum, realizes
Exploitation to geothermal energy resources.But in the field application of Sweden, actual outlet temperature, which is always less than, is expected, one of them
Main cause is that central tube heat preservation and insulation is poor.The water temperature in annular space is consistently higher than due to the water temperature in central tube, therefore
Lasting heat loss can be produced during backwater, reduces and takes thermal power, the popularization of this kind of geothermal exploitation mode is limited.
The heat-insulating property for improving central tube advantageously reduces heat waste, but at present, not yet directly applies to thousands of meters
The backwater insulating tube of hot well.In addition, in the market is also proposed a few money vacuum heat-preserving tubes in recent years, but it is mainly used for ground work
Journey, has its limitation for the application of geothermal well：Firstly, since the thousands of rice of well depth, thus tensile strength to insulating tube, it is anti-in
Compressive Strength and collapse resistance propose more harsh requirement.By calculating, and consider temperature and high-velocity flow
Influence, its intensity at least needs to reach tens MPas, or even up to a hundred MPas；Secondly, according to underground heat drilling technique code (DZ/T
0260-2014), four mineshaft diameter only 152.4mm is opened, the tail pipe diameter of tripping in is even only 114.3mm, therefore is ensureing foot
Under enough water filling annular space size conditions, vacuum pipe size will have greatly limitation, it is necessary to extra is customized processing, improves
Cost；Again, it is contemplated that engineering is actual, it is impossible to thousands of meters of vacuum tube lower going-into-well bottom again is processed on the ground, even if vacuum
Pipe is segmented tripping in, but is due to that can not realize full-scale vacuum heat-preserving, therefore heat loss can be relatively higher；Finally, scene is right
There is no supporting equipment and professional, it is necessary to additionally put into more manpower and materials, and be also possible in the tripping in of vacuum tube
Bring some tripping in or act the safety problem of process.
Thus, the present inventor relies on experience and the practice for being engaged in relevant industries for many years, proposes a kind of geothermal well double-layer vacuum
Insulation construction and its application method, to overcome the defect of prior art.
The content of the invention
It is an object of the invention to provide a kind of geothermal well double-layered vacuum heat-insulation structure and its application method, existing skill is overcome
Generic central pipe poor thermal insulation property present in art and vacuum heat-preserving tube installation difficulty, construction cost height, security can not ensure
The problem of, the structure and its application method can during backwater heat-insulation and heat-preservation, heat loss, security are reduced to greatest extent
Height, effectively improves economic benefit.
The object of the present invention is achieved like this, a kind of geothermal well double-layered vacuum heat-insulation structure；The geothermal well is double-deck true
Empty insulation construction include inner chamber axially through outer tube structure, the top of the outer tube structure, which is removedly sealedly connected with, takes out true
Hollow structure, the bottom of the outer tube structure, which is removedly sealed, is provided with underseal plug, and coaxial sleeve is provided with the outer tube structure
Can axial restraint and inner chamber axially through inner tube structure, the length dimension of said inner tube structure is more than the outer tube structure
Length, the top sealing of said inner tube structure worn by the Vacuuming structure, and the bottom of said inner tube structure can be downwards
Contact is opened sealing after the underseal plug and worn by the outer tube structure, inwall and the said inner tube knot of the outer tube structure
The vacuum heat-insulating layer for the sealed bottom that top is connected with the Vacuuming structure can be constituted between the outer wall of structure.
In the better embodiment of the present invention, the outer tube structure includes outer steel pipe, and the bottom of the outer steel pipe is close
The first sealing via of the Vacuuming structure can be tightly connected by being provided with the top of envelope connection outer tube pipe nipple, the outer steel pipe,
The insertion axially below that the outer steel pipe is located at the described first sealing via is provided with diameter dimension more than said inner tube structure
The outer tube insulation hole of outer diameter size, the bottom of the outer tube pipe nipple, which is provided with, can seal wear said inner tube structure
Two sealing vias, the top that the outer tube pipe nipple is located at the described second sealing via is more than institute axially through diameter dimension is provided with
State the outer pipe nipple insulation hole of the outer diameter size of inner tube structure, the outer tube insulation is with hole, the outer pipe nipple insulation hole
Side wall and said inner tube structure outer wall between can constitute the vacuum heat-insulating layer.
In the better embodiment of the present invention, said inner tube structure includes interior steel pipe, and the bottom of the interior steel pipe is close
Envelope connection inner tube pipe nipple, the top seal of the interior steel pipe is worn by the Vacuuming structure, the bottom of said inner tube pipe nipple
It can seal and wear by the described second sealing via.
In the better embodiment of the present invention, the second sealing via and the outer pipe nipple insulation are set between hole
It is equipped with to be provided with to match with the tapered guide face on the downward tapered tapered guide face of diameter, the outer wall of said inner tube pipe nipple and sets
The inner tube conical surface put, the length dimension of the inner tube pipe nipple below the said inner tube conical surface, which is more than, to be located under the tapered guide face
The length dimension of the outer tube pipe nipple of side.
The present invention a better embodiment in, on the outer wall of said inner tube pipe nipple it is axially spaced be provided with it is multiple close
Seal.
The present invention a better embodiment in, on the outer wall of said inner tube pipe nipple it is axially spaced be provided with it is multiple close
Seal ring groove, each sealing ring is arranged in each closure gasket groove.
In the better embodiment of the present invention, the Vacuuming structure and the described first sealing via are close by screw thread
Envelope connection.
In the better embodiment of the present invention, the Vacuuming structure includes vacuum pipe nipple, the vacuum pipe nipple
Top is provided with to seal to wear seals via by the 3rd of said inner tube structure, and it is close that the vacuum pipe nipple is located at the described 3rd
The insertion axially below of envelope via is provided with diameter dimension and used more than the vacuum heat-preserving of the outer diameter size of said inner tube structure
Hole, the vacuum heat-preserving hole connects to be provided with setting, the outer wall of the vacuum pipe nipple with the vacuum heat-insulating layer and vacuumized
Interface, described one end for vacuumizing interface and the vacuum heat-preserving connect setting with hole, the other end for vacuumizing interface with
Vavuum pump connection is set.
In the better embodiment of the present invention, the bottom of the outer tube structure is provided with the upward tapered plug of diameter
The plug conical surface matched with the side wall of the plug mounting hole is provided with mounting hole, the outer wall of the underseal plug, it is described stifled
Removedly sealing sets the underseal plug in head mounting hole.
The purpose of the present invention can also be achieved in that, the application method of described geothermal well double-layered vacuum heat-insulation structure, bag
Include following steps：
Step a, before well is entered, underseal plug is set in outer tube pipe nipple bottom by glue first, it is then that outer tube is short
Section is connected with outer steel pipe sealing；
Step b, beginning tripping in outer tube structure, stop lowering operation, in well head when outer tube structure is lowered into after correct position
Outer steel pipe is fixed in position；
Step c, by inner tube pipe nipple and interior fastener for connection, while installing sealing ring on inner tube pipe nipple, start to outer tube knot
Tripping in inner tube structure in structure；
Step d, it is lowered into outer tube pipe nipple position when inner tube pipe nipple, under the tapered guide face guiding of outer tube pipe nipple, inner tube
Pipe nipple is entered in the second sealing via of outer tube pipe nipple, continues to transfer interior steel pipe, the bottom contact of inner tube pipe nipple opens underseal
Plug, continuation decentralization inner tube structure is overlapped up to the inner tube conical surface on inner tube pipe nipple outer wall with the tapered guide face of outer tube pipe nipple,
Outer tube insulation constitutes vacuum heat-insulating layer with hole, outer pipe nipple insulation between the side wall in hole and the outer wall of inner tube structure, solid in well head
Determine inner tube structure；
Step d, well head by Vacuuming structure sealing shroud on the inner tube structure, and by the lower seal of Vacuuming structure
The top of outer tube structure is connected to, the other end for vacuumizing interface is connected with vavuum pump, by vavuum pump by vacuum heat-insulating layer
In gas extract out to form vacuum；
Step e, unlatching underground heat quarrying apparatus, inner chamber of the backwater through inner tube structure, which is returned, drains into ground.
From the above mentioned, the geothermal well double-layered vacuum heat-insulation structure and its application method that the present invention is provided have following beneficial effect
Really：
(1) geothermal well double-layered vacuum heat-insulation structural thermal insulation effect of the invention is good, by the inner tube structure that is coaxially arranged and
The full-scale vacuum heat-insulating layer constituted between outer tube structure realizes the vacuum insulation of inner tube structure, high insulating effect, maximum limit
Degree ground reduction heat loss；
(2) geothermal well double-layered vacuum heat-insulation structure of the invention is workable, and all tubing strings are common tubing string, without
Special processing and operation, normal round trip personnel can complete；
(3) geothermal well double-layered vacuum heat-insulation safety of structure of the invention is good, movement-less part, no operations involving high pressure, sealing
Can be permanently effective；
(4) geothermal well double-layered vacuum heat-insulation structure economics of the invention are good, and all tubing strings are common tubing string, and need not
Special heat-insulating material, without special operating personnel, operating aspect, the activity duration is short, reduces operating cost, is particularly suitable for ground
Heat exploitation, the structure causes geothermal energy resources preferably to be developed.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1：Start schematic diagram during exploitation in geothermal well double-layered vacuum heat-insulation structure lower going-into-well for the present invention.
Fig. 2：For the schematic diagram of the outer tube structure of the present invention.
Fig. 3：Schematic diagram when not fallen off for the inner tube structure tripping in outer tube structure midsole block head of the present invention.
Fig. 4：Schematic diagram when being come off for the inner tube structure tripping in outer tube structure midsole block head of the present invention.
In figure：
100th, geothermal well double-layered vacuum heat-insulation structure；
1st, outer tube structure；
11st, outer steel pipe；
111st, the first sealing via；112nd, outer tube insulation hole；
12nd, outer tube pipe nipple；
121st, the second sealing via；122nd, outer pipe nipple insulation hole；123rd, tapered guide face；
13rd, plug mounting hole；
2nd, Vacuuming structure；
21st, vacuum pipe nipple；
211st, the 3rd sealing via；212nd, vacuum heat-preserving hole；
22nd, interface is vacuumized；
3rd, inner tube structure；
31st, interior steel pipe；
32nd, inner tube pipe nipple；321st, closure gasket groove；
33rd, the inner tube conical surface；
4th, vacuum heat-insulating layer；
5th, underseal plug；51st, the plug conical surface；
6th, sealing ring.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now control illustrates this hair
Bright embodiment.
As shown in Figures 1 to 4, the present invention provides a kind of geothermal well double-layered vacuum heat-insulation structure 100, including inner chamber is axially passed through
Logical outer tube structure 1, the top of outer tube structure 1 is removedly sealedly connected with Vacuuming structure 2, in the present embodiment, takes out
Vacuum structure 2 is connected to the top of outer tube structure 1 by thread seal；In underground heat exploitation work progress, outer tube structure 1 is prior to interior
In the tripping in geothermal well of tubular construction 3, in order to avoid being full of down-hole liquid in outer tube structure 1, the bottom of outer tube structure 1 is removedly close
Envelope is provided with underseal plug 5.In outer tube structure 1 coaxial sleeve provided with can axial restraint and inner chamber axially through inner tube structure
3, the length dimension of inner tube structure 3 is more than the length of outer tube structure 1, and the top of inner tube structure 3, which can be sealed, to be worn by vacuumizing
Structure 2, the downward contact of bottom energy of inner tube structure 3, which is opened to seal after underseal plug 5, to be worn by outer tube structure 1, inner tube structure 3
Bottom pass outer tube structure 1 and enter in geothermal well, inner chamber of the backwater through inner tube structure 3 in underground heat exploitation is returned and is discharged to ground.
Outer tube structure 1 and inner tube structure 3 use common tubing string, without special processing and operation, normal round trip personnel
It can complete；The bottom that top is connected with Vacuuming structure 2 can be constituted between the inwall of outer tube structure 1 and the outer wall of inner tube structure 3
The sealed vacuum heat-insulating layer 4 in portion, vacuum heat-insulating layer 4 is full-scale heat-insulation layer, and it can be coated on inner tube structure 3 positioned at outer tube structure
On the outer wall of full section inside 1, vacuum heat-insulating layer 4 can realize the vacuum insulation of inner tube structure 3, and minimal amount of heat passes through heat
The mode of radiation is scattered and disappeared, and high insulating effect can avoid thermal loss substantially.
The geothermal well double-layered vacuum heat-insulation structural thermal insulation effect of the present invention is good, passes through the inner tube structure and outer tube being coaxially arranged
The full-scale vacuum heat-insulating layer constituted between structure realizes the vacuum insulation of inner tube structure, high insulating effect, to greatest extent
Reduce heat loss；The geothermal well double-layered vacuum heat-insulation structure of the present invention is workable, and all tubing strings are common tubing string, without
Special processing and operation, normal round trip personnel can complete；The geothermal well double-layered vacuum heat-insulation structure safety of the present invention
Good, the movement-less part of property, no operations involving high pressure, sealing can be permanently effective；The geothermal well double-layered vacuum heat-insulation structure economics of the present invention
Property it is good, all tubing strings are common tubing string, and without special heat-insulating material, without special operating personnel, operating aspect, during operation
Between it is short, reduce operating cost, be particularly suitable for geothermal exploitation.
Further, as shown in Figures 1 to 4, outer tube structure 1 includes outer steel pipe 11, and outer steel pipe 11 uses common tubing string,
Its length and caliber can be determined according to actual production；The lower seal connection outer tube pipe nipple 12 of outer steel pipe 11, in this embodiment party
In formula, outer steel pipe 11 connects outer tube pipe nipple 12 by thread seal, and the top of outer steel pipe 11 is provided with and can seal connection and vacuumize
Connection screw thread is provided with first sealing via 111 of structure 2, the inwall of the first sealing via 111, outer steel pipe 11 is located at first
The insertion axially below of sealing via 111 is provided with outer tube insulation of the diameter dimension more than the outer diameter size of inner tube structure 3
With hole 112, the bottom of outer tube pipe nipple 12, which is provided with, can seal the wear inner tube structure 3 second sealing via 121, outer tube pipe nipple 12
Top positioned at the second sealing via 121 is axially through being provided with outer diameter size of the diameter dimension more than inner tube structure 3
Hole 122 is used in the insulation of outer pipe nipple, outer tube insulation hole 112, the insulation of outer pipe nipple with the outer wall of the side wall in hole 122 and inner tube structure 3 it
Between can constitute foregoing vacuum heat-insulating layer 4.
Further, as shown in Fig. 1, Fig. 3, Fig. 4, inner tube structure 3 includes interior steel pipe 31, and interior steel pipe 31 is using common tubing string
Can, its length and caliber with outer steel pipe 11 can match setting according to actual production；The lower seal connection inner tube of interior steel pipe 31
Pipe nipple 32, in the present embodiment, interior steel pipe 31 connect inner tube pipe nipple 32 by thread seal, and the top seal of interior steel pipe 31 is worn
If by Vacuuming structure 2, the bottom of inner tube pipe nipple 32, which can be sealed, to be worn by the second sealing via 121.In present embodiment
In, it is axially spaced on the outer wall of inner tube pipe nipple 32 to be provided with multiple sealing rings 6, it is interior in the specific embodiment of the present invention
Axially spaced on the outer wall of pipe pipe nipple 32 to be provided with multiple closure gasket grooves 321, each sealing ring 6 is arranged in each closure gasket groove 321
It is interior.The sealing effectiveness that sealing ring 6 can be such that inner tube pipe nipple 32 and second seals between via 121 is more preferable.
Further, as shown in Figure 1 and Figure 2, the second sealing via 121 and outer pipe nipple insulation are provided with diameter between hole 122
The inner tube for matching and setting with tapered guide face 123 is provided with downward tapered tapered guide face 123, the outer wall of inner tube pipe nipple 32
The conical surface 33.Inner tube structure 3 is slidedly arranged in outer tube structure 1, and the inner tube conical surface 33 and tapered guide being displaced downwardly on inner tube pipe nipple 32
During 123 abutting contact of face, inner tube structure 3 stops moving down.As shown in Figure 3, Figure 4, the inner tube pipe nipple 32 below the inner tube conical surface
Length dimension L1 be more than the length dimension L2 of the outer tube pipe nipple being located at below tapered guide face, will be outer to meet inner tube pipe nipple 32
The requirement that the contact of underseal plug 5 of the bottom of pipe pipe nipple 12 is opened.
Further, as shown in figure 1, Vacuuming structure 2 is in cap-like structure, including vacuum pipe nipple 21, the top of vacuum pipe nipple 21
Portion is provided with to seal to wear seals via 211 by the 3rd of inner tube structure 3, and vacuum pipe nipple 21 is located at the 3rd sealing via
211 insertion axially below is provided with vacuum heat-preserving hole 212 of the diameter dimension more than the outer diameter size of inner tube structure 3,
Vacuum heat-preserving connects setting with vacuum heat-insulating layer 4 with hole 212, and vacuum heat-preserving hole 212 collectively forms sealing with vacuum heat-insulating layer 4
Keeping warmth space layer, be provided with the side wall of vacuum pipe nipple 21 and vacuumize interface 22, the one end and vacuum for vacuumizing interface 22 are protected
Temperature is connected with hole 212 and set.The other end of interface 22 and vavuum pump (prior art, figure not shown in) connection is vacuumized to set.
Further, as shown in Figures 1 to 4, the bottom of outer tube structure 1 is provided with the upward tapered plug mounting hole of diameter
13, it is provided with the plug conical surface 51 matched with the side wall of plug mounting hole 13, plug mounting hole 13 on the outer wall of underseal plug 5
Removedly sealing sets underseal plug 5., will before the tripping in geothermal well of outer tube structure 1 in the specific embodiment of the present invention
Underseal plug 5 is fixed in plug mounting hole 13 by glue sealing.
When carrying out underground heat exploitation using the geothermal well double-layered vacuum heat-insulation structure 100 of the present invention, before well is entered, first the bottom of by
Block head 5 is set in the plug mounting hole 13 of the bottom of outer tube pipe nipple 12, then by outer tube pipe nipple 12 and outer steel pipe by glue
11 are connected through a screw thread, and start tripping in outer tube structure 1, and under hydraulic pressure effect, underseal plug 5 is pressed in plug mounting hole 13
It is interior, stop lowering operation when outer tube structure 1 is lowered into after correct position, outer steel pipe 11 is fixed in pithead position；Then by inner tube
Pipe nipple 32 is connected through a screw thread with interior steel pipe 31, while installing sealing ring 6 on inner tube pipe nipple 32, is started into outer tube structure 1
Tripping in inner tube structure 3 (its state is as shown in Figure 3), when inner tube pipe nipple 32 is lowered into the position of outer tube pipe nipple 12, in outer tube pipe nipple 12
Tapered guide face 123 guide under, inner tube pipe nipple 32 enter outer tube pipe nipple 12 second sealing via 121 in, continue transfer
Interior steel pipe 31, when inner tube pipe nipple 32 reaches underseal position, the bottom contact of inner tube pipe nipple 32 opens underseal under gravity
Plug 5, continues to transfer inner tube structure 3 until the tapered guide of the inner tube conical surface 33 and outer tube pipe nipple 12 on the outer wall of inner tube pipe nipple 32
Face 123 is overlapped, and the bottom of inner tube pipe nipple 32 is in geothermal well, and the inner chamber of inner tube structure 3 is connected with geothermal well.Outer tube insulation is used
Hole 112, outer pipe nipple insulation composition vacuum heat-insulating layer 4 (its state such as Fig. 4 between the side wall in hole 122 and the outer wall of inner tube structure 3
It is shown), the height of inner tube structure 3 is adjusted to install Vacuuming structure 2 in well head, and fixes inner tube structure 3 in well head；As schemed
Shown in 1, the sealing shroud of vacuum pipe nipple 21 of Vacuuming structure 2 is located on interior steel pipe 31 in well head, and by under vacuum pipe nipple 21
Portion is sealedly attached in the first sealing via 111 of outer steel pipe 11, and the other end for vacuumizing interface 22 is connected with vavuum pump, led to
Cross vavuum pump to extract out to form vacuum by the gas in vacuum heat-insulating layer 4, realize the full-scale vacuum heat-preserving in underground heat recovery process,
Underground heat quarrying apparatus are opened, underground heat exploitation are carried out, inner chamber of the backwater through inner tube structure 3, which is returned, drains into ground.
From the above mentioned, the geothermal well double-layered vacuum heat-insulation structure and its application method that the present invention is provided have following beneficial effect
Really：
(1) geothermal well double-layered vacuum heat-insulation structural thermal insulation effect of the invention is good, by the inner tube structure that is coaxially arranged and
The full-scale vacuum heat-insulating layer constituted between outer tube structure realizes the vacuum insulation of inner tube structure, high insulating effect, maximum limit
Degree ground reduction heat loss；
(2) geothermal well double-layered vacuum heat-insulation structure of the invention is workable, and all tubing strings are common tubing string, without
Special processing and operation, normal round trip personnel can complete；
(3) geothermal well double-layered vacuum heat-insulation safety of structure of the invention is good, movement-less part, no operations involving high pressure, sealing
Can be permanently effective；
(4) geothermal well double-layered vacuum heat-insulation structure economics of the invention are good, and all tubing strings are common tubing string, and need not
Special heat-insulating material, without special operating personnel, operating aspect, the activity duration is short, reduces operating cost, is particularly suitable for ground
Heat exploitation, the structure causes geothermal energy resources preferably to be developed.
Schematical embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, made equivalent variations and modification on the premise of the design of the present invention and principle is not departed from,
The scope of protection of the invention should be belonged to.
Claims (10)
1. a kind of geothermal well double-layered vacuum heat-insulation structure；It is characterized in that：The geothermal well double-layered vacuum heat-insulation structure includes interior
Chamber axially through outer tube structure, the top of the outer tube structure is removedly sealedly connected with Vacuuming structure, the outer tube
The bottom of structure, which is removedly sealed, is provided with underseal plug, in the outer tube structure coaxial sleeve provided with can axial restraint and
Inner chamber axially through inner tube structure, the length dimension of said inner tube structure is more than the length of the outer tube structure, said inner tube
The top sealing of structure is worn by the Vacuuming structure, and the bottom of said inner tube structure contact can open the underseal downwards
Sealing is worn by the outer tube structure after plug, can structure between the inwall of the outer tube structure and the outer wall of said inner tube structure
The vacuum heat-insulating layer of the sealed bottom connected into top with the Vacuuming structure.
2. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 1, it is characterised in that：The outer tube structure includes outer steel
Described take out very can be tightly connected by being provided with the top of pipe, the lower seal connection outer tube pipe nipple of the outer steel pipe, the outer steel pipe
First sealing via of hollow structure, the insertion axially below that the outer steel pipe is located at the described first sealing via is provided with diameter chi
The outer tube insulation hole of the very little outer diameter size more than said inner tube structure, the bottom of the outer tube pipe nipple is provided with and can sealed
Wear said inner tube structure second sealing via, the outer tube pipe nipple be located at described second sealing via top axially through
Outer pipe nipple insulation hole of the diameter dimension more than the outer diameter size of said inner tube structure is provided with, the outer tube insulation is used
The vacuum heat-insulating layer can be constituted between the outer wall in hole, the side wall in the outer pipe nipple insulation hole and said inner tube structure.
3. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 2, it is characterised in that：Said inner tube structure includes interior steel
Pipe, the lower seal connection inner tube pipe nipple of the interior steel pipe, the top seal of the interior steel pipe is worn vacuumizes knot by described
Structure, the bottom of said inner tube pipe nipple, which can be sealed, to be worn by the described second sealing via.
4. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 3, it is characterised in that：The second sealing via and institute
State outer pipe nipple insulation and be provided with being provided between hole on diameter tapered tapered guide face downwards, the outer wall of said inner tube pipe nipple
The inner tube conical surface set is matched with the tapered guide face, the length dimension of the inner tube pipe nipple below the said inner tube conical surface is big
In the length dimension of the outer tube pipe nipple below the tapered guide face.
5. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 3, it is characterised in that：On the outer wall of said inner tube pipe nipple
It is axially spaced to be provided with multiple sealing rings.
6. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 5, it is characterised in that：On the outer wall of said inner tube pipe nipple
Axially spaced to be provided with multiple closure gasket grooves, each sealing ring is arranged in each closure gasket groove.
7. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 2, it is characterised in that：The Vacuuming structure with it is described
First sealing via is connected by thread seal.
8. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 1, it is characterised in that：The Vacuuming structure includes true
It is provided with to seal to wear at the top of empty pipe nipple, the vacuum pipe nipple and seals via by the 3rd of said inner tube structure, it is described
It is outer more than said inner tube structure that vacuum pipe nipple is provided with diameter dimension positioned at the insertion axially below of the described 3rd sealing via
The vacuum heat-preserving hole of wall diameter dimension, the vacuum heat-preserving hole connects setting with the vacuum heat-insulating layer, and the vacuum is short
It is provided with the side wall of section and vacuumizes interface, described one end for vacuumizing interface connects setting, institute with hole with the vacuum heat-preserving
State the other end for vacuumizing interface and vavuum pump connects setting.
9. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 1, it is characterised in that：The bottom of the outer tube structure is set
It is equipped with the side wall being provided with the upward tapered plug mounting hole of diameter, the outer wall of the underseal plug with the plug mounting hole
Removedly sealing sets the underseal plug in the plug conical surface of matching, the plug mounting hole.
10. the application method of the geothermal well double-layered vacuum heat-insulation structure as described in any one of claim 1 to 9, it is characterised in that
Comprise the following steps：
Step a, before well is entered, underseal plug is set in outer tube pipe nipple bottom by glue first, then by outer tube pipe nipple with
Outer steel pipe sealing connection；
Step b, beginning tripping in outer tube structure, stop lowering operation, in pithead position when outer tube structure is lowered into after correct position
Fixed outer steel pipe；
Step c, by inner tube pipe nipple and interior fastener for connection, while installing sealing ring on inner tube pipe nipple, start into outer tube structure
Tripping in inner tube structure；
Step d, it is lowered into outer tube pipe nipple position when inner tube pipe nipple, under the tapered guide face guiding of outer tube pipe nipple, inner tube pipe nipple
In the second sealing via for entering outer tube pipe nipple, continue to transfer interior steel pipe, the bottom contact of inner tube pipe nipple opens underseal plug,
Continue to transfer inner tube structure until the inner tube conical surface on inner tube pipe nipple outer wall is overlapped with the tapered guide face of outer tube pipe nipple, outer tube is protected
Temperature constitutes vacuum heat-insulating layer with hole, outer pipe nipple insulation between the side wall in hole and the outer wall of inner tube structure, and inner tube is fixed in well head
Structure；
Step d, in well head Vacuuming structure sealing shroud connected on the inner tube structure, and by the lower seal of Vacuuming structure
In the top of outer tube structure, the other end for vacuumizing interface is connected with vavuum pump, by vavuum pump by vacuum heat-insulating layer
Gas is extracted out to form vacuum；
Step e, unlatching underground heat quarrying apparatus, inner chamber of the backwater through inner tube structure, which is returned, drains into ground.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109595833A (en) * | 2018-12-03 | 2019-04-09 | 湖南达道新能源开发有限公司 | A kind of underground heat extract equipment with heat insulation function |
| CN109708328A (en) * | 2018-12-29 | 2019-05-03 | 湖南达道新能源开发有限公司 | A kind of producing device and application method of geothermal heat pipeline insulating layer |
| CN113310230A (en) * | 2021-07-01 | 2021-08-27 | 李成成 | Multi-pipe deep well heat exchange device with conical water collection countersunk head |
| CN113531252A (en) * | 2021-06-29 | 2021-10-22 | 北京航天发射技术研究所 | Vacuum heat insulation low-temperature connector |
| CN114017934A (en) * | 2021-09-17 | 2022-02-08 | 中材(北京)地热能科技有限公司 | Tube bottom self-sealing device of coaxial sleeve heat exchanger |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2555394Y (en) * | 2002-07-05 | 2003-06-11 | 盘锦兴隆石化机械厂 | Vacuum thermal insulation heat pouring compensator |
| CN102704867A (en) * | 2012-06-08 | 2012-10-03 | 山东创佳石油机械制造有限公司 | Vacuum heat-preservation circulating pipe special for oil production of oilfield |
| CN203570215U (en) * | 2013-10-24 | 2014-04-30 | 辽宁九通石油机械制造有限公司 | Efficient and energy-saving compensating device |
| CN104948118A (en) * | 2015-06-16 | 2015-09-30 | 中国石油天然气股份有限公司 | Vacuum heat insulation pipe |
| CN205078195U (en) * | 2015-11-13 | 2016-03-09 | 东营新佳环保技术开发有限公司 | Bimetal heat preservation oil pipe |
| CN206000473U (en) * | 2016-08-24 | 2017-03-08 | 东营新佳环保技术开发有限公司 | Vacuum heat-insulation sucker rod |
-
2017
- 2017-07-05 CN CN201710542031.3A patent/CN107166137B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2555394Y (en) * | 2002-07-05 | 2003-06-11 | 盘锦兴隆石化机械厂 | Vacuum thermal insulation heat pouring compensator |
| CN102704867A (en) * | 2012-06-08 | 2012-10-03 | 山东创佳石油机械制造有限公司 | Vacuum heat-preservation circulating pipe special for oil production of oilfield |
| CN203570215U (en) * | 2013-10-24 | 2014-04-30 | 辽宁九通石油机械制造有限公司 | Efficient and energy-saving compensating device |
| CN104948118A (en) * | 2015-06-16 | 2015-09-30 | 中国石油天然气股份有限公司 | Vacuum heat insulation pipe |
| CN205078195U (en) * | 2015-11-13 | 2016-03-09 | 东营新佳环保技术开发有限公司 | Bimetal heat preservation oil pipe |
| CN206000473U (en) * | 2016-08-24 | 2017-03-08 | 东营新佳环保技术开发有限公司 | Vacuum heat-insulation sucker rod |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109595833A (en) * | 2018-12-03 | 2019-04-09 | 湖南达道新能源开发有限公司 | A kind of underground heat extract equipment with heat insulation function |
| CN109708328A (en) * | 2018-12-29 | 2019-05-03 | 湖南达道新能源开发有限公司 | A kind of producing device and application method of geothermal heat pipeline insulating layer |
| CN113531252A (en) * | 2021-06-29 | 2021-10-22 | 北京航天发射技术研究所 | Vacuum heat insulation low-temperature connector |
| CN113310230A (en) * | 2021-07-01 | 2021-08-27 | 李成成 | Multi-pipe deep well heat exchange device with conical water collection countersunk head |
| CN114017934A (en) * | 2021-09-17 | 2022-02-08 | 中材(北京)地热能科技有限公司 | Tube bottom self-sealing device of coaxial sleeve heat exchanger |
| CN114017934B (en) * | 2021-09-17 | 2024-04-19 | 中材(北京)地热能科技有限公司 | Self-sealing device for bottom of coaxial double-pipe heat exchanger |
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