CN107166137B - 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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- CN107166137B CN107166137B CN201710542031.3A CN201710542031A CN107166137B CN 107166137 B CN107166137 B CN 107166137B CN 201710542031 A CN201710542031 A CN 201710542031A CN 107166137 B CN107166137 B CN 107166137B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The 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 cavity axially through outer tube structure, the top of outer tube structure is removedly sealedly connected with Vacuuming structure, removedly sealed set has underseal plug for the bottom of outer tube structure, coaxial sleeve is equipped with energy axial restraint in outer tube structure, and inner cavity 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, which is worn, passes through Vacuuming structure, sealing, which is worn, after the downward contact opening underseal plug of bottom energy of inner tube structure passes through outer tube structure, the vacuum heat-insulating layer for the sealed bottom that top is connected to Vacuuming structure can be constituted between the inner wall of outer tube structure and the outer wall of inner tube structure.The structure and its application method can during return water heat-insulation and heat-preservation, reduce heat loss to the maximum 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 uses
Method.
Background technology
Since the 21th century, with Chinese society rapid economic development, energy supply and demand contradictory aggravation, energy resource structure
The needs of adjustment and energy-saving and emission-reduction and environmental protection, the utilization of regenerative resource are increasingly subject to the attention of the whole society.Ground
Thermal energy is as a kind of 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.
It is a kind of current most efficient geothermal exploitation mode that direct water acquisition, which takes heat, but a large amount of extraction of underground water can cause
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 a problem of that tail water recharge is difficult, and not yet large-scale promotion utilizes.
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 " heat is taken not fetch water ", i.e., injects cold water in oil jacket annular space, pass through the continuous of water
Flowing forms heat convection with high ambient temperatures stratum, and at shaft bottom, water temperature reaches highest, is returned by oil pipe and is discharged to ground, realizes
Utilization to geothermal energy resources.But in the field application of Sweden, practical outlet temperature, which is always less than, is expected, one of them
Main cause is that central tube heat preservation and insulation is poor.Since the water temperature in central tube is consistently higher than the water temperature in annular space,
Lasting heat loss is will produce during return water, reduces and takes thermal power, limit the popularization of this kind of geothermal exploitation mode.
The heat-insulating property for improving central tube advantageously reduces heat waste, but currently, there has been no directly apply to thousands of meters
The return water insulating tube of hot well.In addition, being also proposed a few money vacuum heat-preserving tubes in the market 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 to the tensile strength of insulating tube, it is anti-in
Compressive Strength and collapse resistance propose more harsh requirement.By calculating, and consider temperature and high-velocity flow
It influences, intensity at least needs to reach tens megapascal or even a megapascal up to a hundred；Secondly, according to underground heat drilling technique regulation (DZ/T
0260-2014), four to open mineshaft diameter be only 152.4mm, and 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, which will have, greatly to be limited, need it is additional be customized processing, improve
Cost；Again, it is contemplated that engineering is practical, 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 due to can not achieve full-scale vacuum heat-preserving, heat loss can be relatively higher；Finally, scene is right
There is no mating equipment and professional in the tripping in of vacuum tube, needs additionally to put into more manpower and materials, and be also possible to
It brings some tripping in or acts the safety problem of process.
The present inventor relies on experience and the practice for being engaged in relevant industries for many years as a result, proposes a kind of geothermal well double-layer vacuum
Insulation construction and its application method, to overcome the deficiencies of existing technologies.
Invention content
The purpose of the present invention is to provide a kind of geothermal well double-layered vacuum heat-insulation structure and its application methods, overcome existing skill
Generic central pipe poor thermal insulation property present in art and vacuum heat-preserving tube are difficult to install, construction cost is high, safety can not ensure
The problem of, the structure and its application method can during return water heat-insulation and heat-preservation, reduce heat loss, safety to the maximum 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 cavity axially through outer tube structure, it is true that the top of the outer tube structure is removedly sealedly connected with pumping
Hollow structure, removedly sealed set has a underseal plug for the bottom of the outer tube structure, and coaxial sleeve is equipped in the outer tube structure
Can axial restraint and inner cavity 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 wears through the Vacuuming structure, and the bottom of said inner tube structure can be downwards
Sealing is worn through the outer tube structure, inner wall and the said inner tube knot of the outer tube structure after contact opens the underseal plug
The vacuum heat-insulating layer for the sealed bottom that top is connected to 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 lower part of the outer steel pipe is close
Envelope connects outer tube pipe nipple, and the first sealing via that can be tightly connected the Vacuuming structure is provided at the top of the outer steel pipe,
The outer steel pipe is located at the perforation axially below that described first seals via and is provided with diameter dimension more than said inner tube structure
The outer tube heat preservation hole of outer diameter size, the lower part of the outer tube pipe nipple, which is provided with, can seal wear said inner tube structure
Two sealing vias, the outer tube pipe nipple are located at the top that described second seals via and are more than institute axially through diameter dimension is provided with
State the outer pipe nipple heat preservation hole of the outer diameter size of inner tube structure, the outer tube heat preservation hole, the outer pipe nipple heat preservation hole
Side wall and the outer wall of said inner tube structure 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 lower part of the interior steel pipe is close
Envelope connection inner tube pipe nipple, the top seal of the interior steel pipe are worn through the Vacuuming structure, the lower part of said inner tube pipe nipple
It can seal to wear and seal via by described second.
In the better embodiment of the present invention, the second sealing via and the outer pipe nipple heat preservation are set between hole
It is equipped with diameter tapered tapered guide face downwards, is provided with to match with the tapered guide face on the outer wall of said inner tube pipe nipple and sets
The inner tube conical surface set, the length dimension for being located at the inner tube pipe nipple below the said inner tube conical surface are more than 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 slot, each sealing ring are arranged in each closure gasket groove.
In the better embodiment of the present invention, the Vacuuming structure and the 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 third of said inner tube structure, and it is close that the vacuum pipe nipple is located at the third
The perforation axially below of envelope via is provided with diameter dimension and is used more than the vacuum heat-preserving of the outer diameter size of said inner tube structure
Hole, the vacuum heat-preserving hole are connected to setting with the vacuum heat-insulating layer, are provided with and vacuumize on the outer wall of the vacuum pipe nipple
Interface, described one end for vacuumizing interface and the vacuum heat-preserving are connected to setting with hole, the other end for vacuumizing interface with
Vacuum pump connection setting.
In the better embodiment of the present invention, the bottom of the outer tube structure is provided with the upward tapered plug of diameter
Mounting hole, be provided on the outer wall of the underseal plug with the matched plug conical surface of the side wall of the plug mounting hole, it is described stifled
Removedly underseal plug described in sealed set in head mounting hole.
The purpose of the present invention can also be achieved, the application method of the geothermal well double-layered vacuum heat-insulation structure, packet
Include following steps：
Step a, before entering well, underseal plug is set by glue in outer tube pipe nipple bottom first, it is then that outer tube is short
Section is tightly connected with outer steel pipe；
Step b, start tripping in outer tube structure, stop lowering operation after outer tube structure is lowered into suitable position, in well head
Outer steel pipe is fixed in position；
Step c, by inner tube pipe nipple and interior fastener for connection, while sealing ring being installed on inner tube pipe nipple, starts to outer tube knot
Tripping in inner tube structure in structure；
Step d, when inner tube pipe nipple is lowered into outer tube pipe nipple position, under the guiding of the tapered guide face of outer tube pipe nipple, inner tube
Pipe nipple enters in the second sealing via of outer tube pipe nipple, continues to transfer interior steel pipe, the bottom end contact of inner tube pipe nipple opens underseal
Plug, continue transfer inner tube structure until inner tube pipe nipple outer wall on the inner tube conical surface overlapped with the tapered guide face of outer tube pipe nipple,
Outer tube heat preservation hole, outer pipe nipple heat preservation hole side wall and the outer wall of inner tube structure between constitute vacuum heat-insulating layer, it is solid in well head
Determine inner tube structure；
Step d, Vacuuming structure sealing shroud is set on inner tube structure in well head, and by the lower seal of Vacuuming structure
It is connected to the top of outer tube structure, the other end for vacuumizing interface is connected to vacuum pump, by vacuum pump by vacuum heat-insulating layer
In gas extract out to form vacuum；
Step e, underground heat quarrying apparatus is opened, inner cavity of the return water through inner tube structure, which is returned, drains into ground.
From the above mentioned, geothermal well double-layered vacuum heat-insulation structure and its application method provided by the invention have following beneficial to effect
Fruit：
(1) geothermal well double-layered vacuum heat-insulation structural thermal insulation effect of the invention is good, the inner tube structure by being coaxially arranged and
The full-scale vacuum heat-insulating layer constituted between outer tube structure realizes the vacuum insulation of inner tube structure, and heat insulation effect is good, maximum limit
Degree ground reduces heat loss；
(2) geothermal well double-layered vacuum heat-insulation structure operability of the invention is strong, and all tubing strings are common tubing string, are not necessarily to
Special processing and operation, normal round trip personnel can be completed；
(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
It 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 are not necessarily to
Special heat-insulating material is not necessarily to special operating personnel, and operating aspect, the activity duration is short, reduces operating cost, is particularly suitable for ground
Heat exploitation, the structure make geothermal energy resources preferably be developed and used.
Description of the drawings
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein：
Fig. 1：Start schematic diagram when 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 falling off for the inner tube structure tripping in outer tube structure midsole block head of the present invention.
In figure：
100, geothermal well double-layered vacuum heat-insulation structure；
1, outer tube structure；
11, outer steel pipe；
111, the first sealing via；112, outer tube heat preservation hole；
12, outer tube pipe nipple；
121, the second sealing via；122, outer pipe nipple heat preservation hole；123, tapered guide face；
13, plug mounting hole；
2, Vacuuming structure；
21, vacuum pipe nipple；
211, third seals via；212, vacuum heat-preserving hole；
22, interface is vacuumized；
3, inner tube structure；
31, interior steel pipe；
32, inner tube pipe nipple；321, closure gasket groove；
33, the inner tube conical surface；
4, vacuum heat-insulating layer；
5, underseal plug；51, the plug conical surface；
6, sealing ring.
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair
Bright specific implementation mode.
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 cavity is axially passed through
The top of logical outer tube structure 1, 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；Underground heat is exploited in work progress, and outer tube structure 1 is prior to interior
In 3 tripping in geothermal well of pipe structure, 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 be equipped with can axial restraint and inner cavity 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 seal, to be worn by vacuumizing
Structure 2, the bottom of inner tube structure 3 contact can open to seal after underseal plug 5 and wear through outer tube structure 1, inner tube structure 3 downwards
Bottom end be pierced by outer tube structure 1 and enter in geothermal well, inner cavity of the return water 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 are all made of common tubing string, without special processing and operation, normal round trip personnel
It can be completed；The bottom that top is connected to Vacuuming structure 2 can be constituted between the inner wall of outer tube structure 1 and the outer wall of inner tube structure 3
The vacuum heat-insulating layer 4 of portion's sealing, vacuum heat-insulating layer 4 are full-scale insulating layer, can be coated on inner tube structure 3 and be located at outer tube structure
On the outer wall of full section inside 1, vacuum heat-insulating layer 4 can realize that the vacuum insulation of inner tube structure 3, minimal amount of heat pass through heat
The mode of radiation is scattered and disappeared, and heat insulation effect is good, substantially can be to avoid thermal loss.
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, and heat insulation effect is good, to the maximum extent
Reduce heat loss；The geothermal well double-layered vacuum heat-insulation structure operability of the present invention is strong, and all tubing strings are common tubing string, are not necessarily to
Special processing and operation, normal round trip personnel can be completed；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 are not necessarily to special heat-insulating material, are not necessarily to special operating personnel, operating aspect, when 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 to seal to be connected to and vacuumize
The first of structure 2 seals via 111, is provided with connection screw thread on the inner wall of the first sealing via 111, outer steel pipe 11 is located at first
The perforation axially below of sealing via 111 is provided with outer tube heat preservation of the diameter dimension more than the outer diameter size of inner tube structure 3
With hole 112, the lower part 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
Positioned at the top of the second sealing via 121 axially through being provided with outer diameter size of the diameter dimension more than inner tube structure 3
Hole 122 is used in the heat preservation of outer pipe nipple, outer tube heat preservation hole 112, outer pipe nipple heat preservation hole 122 side wall and inner tube structure 3 outer wall it
Between can constitute vacuum heat-insulating layer 4 above-mentioned.
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, length and caliber can match setting according to actual production with outer steel pipe 11；The lower seal of interior steel pipe 31 connects inner tube
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 lower part of inner tube pipe nipple 32, which can seal, to be worn through 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.Sealing effect between sealing ring 6 can make inner tube pipe nipple 32 and second seal via 121 is more preferable.
Further, as shown in Figure 1 and Figure 2, the second sealing via 121 and outer pipe nipple heat preservation are provided with diameter between hole 122
Tapered tapered guide face 123 downwards is provided with the inner tube for match and being arranged with tapered guide face 123 on 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
When 123 abutting contact of face, the stopping of inner tube structure 3 moves down.As shown in Figure 3, Figure 4, the inner tube pipe nipple 32 being located at below the inner tube conical surface
Length dimension L1 be more than be located at tapered guide face below outer tube pipe nipple length dimension L2, will be outer to meet inner tube pipe nipple 32
The requirement that 5 contact of underseal plug of 12 bottom of pipe pipe nipple 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 third of inner tube structure 3, and vacuum pipe nipple 21 is located at third sealing via
211 perforation 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 hole 212 is connected to setting with vacuum heat-insulating layer 4, and vacuum heat-preserving hole 212 collectively forms sealing with vacuum heat-insulating layer 4
Keeping warmth space layer, be provided on the side wall of vacuum pipe nipple 21 and vacuumize interface 22, the one end and vacuum for vacuumizing interface 22 are protected
The temperature connection setting of hole 212.The other end and vacuum pump (prior art is not shown in figure) connection for vacuumizing interface 22 are arranged.
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, be provided on the outer wall of underseal plug 5 with the matched plug conical surface 51 of the side wall of plug mounting hole 13, in plug mounting hole 13
Removedly sealed set underseal plug 5.It, will before 1 tripping in geothermal well of outer tube structure in the specific embodiment of the present invention
Underseal plug 5 is fixed on by glue sealing in plug mounting hole 13.
When carrying out underground heat exploitation using the geothermal well double-layered vacuum heat-insulation structure 100 of the present invention, before entering well, first the bottom of by
Block head 5 is set by glue in the plug mounting hole 13 of 12 bottom of outer tube pipe nipple, then by outer tube pipe nipple 12 and outer steel pipe
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 after outer tube structure 1 is lowered into suitable 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 sealing ring 6 is installed 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 12 position of outer tube pipe nipple, 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 to transfer
Interior steel pipe 31, when inner tube pipe nipple 32 reaches underseal position, the bottom end contact of inner tube pipe nipple 32 opens underseal under gravity
Plug 5 continues to transfer inner tube structure 3 tapered guide until the inner tube conical surface 33 and outer tube pipe nipple 12 on 32 outer wall of inner tube pipe nipple
Face 123 overlaps, and the bottom end of inner tube pipe nipple 32 is in geothermal well, and the inner cavity of inner tube structure 3 is connected to geothermal well.Outer tube heat preservation is used
Hole 112, outer pipe nipple, which are kept the temperature, constitutes (its state such as Fig. 4 of vacuum heat-insulating layer 4 between side wall and the outer wall of inner tube structure 3 with hole 122
It is shown), the height of inner tube structure 3 is adjusted in well head to install Vacuuming structure 2, and fixes inner tube structure 3 in well head；Such as figure
Shown in 1,21 sealing shroud of vacuum pipe nipple of Vacuuming structure 2 is set on interior steel pipe 31 in well head, and will be 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 to vacuum pump, is led to
It crosses vacuum pump to extract the gas in vacuum heat-insulating layer 4 out to form vacuum, realizes the full-scale vacuum heat-preserving in underground heat recovery process,
Underground heat quarrying apparatus is opened, carries out underground heat exploitation, inner cavity of the return water through inner tube structure 3, which is returned, drains into ground.
From the above mentioned, geothermal well double-layered vacuum heat-insulation structure and its application method provided by the invention have following beneficial to effect
Fruit：
(1) geothermal well double-layered vacuum heat-insulation structural thermal insulation effect of the invention is good, the inner tube structure by being coaxially arranged and
The full-scale vacuum heat-insulating layer constituted between outer tube structure realizes the vacuum insulation of inner tube structure, and heat insulation effect is good, maximum limit
Degree ground reduces heat loss；
(2) geothermal well double-layered vacuum heat-insulation structure operability of the invention is strong, and all tubing strings are common tubing string, are not necessarily to
Special processing and operation, normal round trip personnel can be completed；
(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
It 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 are not necessarily to
Special heat-insulating material is not necessarily to special operating personnel, and operating aspect, the activity duration is short, reduces operating cost, is particularly suitable for ground
Heat exploitation, the structure make geothermal energy resources preferably be developed and used.
The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.It is any
Those skilled in the art, made equivalent variations and modification under the premise of not departing from design and the principle of the present invention,
The scope of protection of the invention should be belonged to.
Claims (9)
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
Removedly sealed set has a underseal plug for the bottom of structure, in the outer tube structure coaxial sleeve be equipped with can axial restraint and
Inner cavity 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 through the Vacuuming structure, and the bottom of said inner tube structure contact can open the underseal downwards
Sealing is worn through the outer tube structure after plug, can structure between the inner wall and the outer wall of said inner tube structure of the outer tube structure
At the vacuum heat-insulating layer for the sealed bottom that top is connected to the Vacuuming structure；
The outer tube structure includes outer steel pipe, and the lower seal of the outer steel pipe connects outer tube pipe nipple, the top of the outer steel pipe
The first sealing via of the Vacuuming structure can be tightly connected by being provided with, and the outer steel pipe is located at described first and seals via
Perforation is provided with outer tube heat preservation hole of the diameter dimension more than the outer diameter size of said inner tube structure axially below, described outer
The lower part of pipe pipe nipple, which is provided with, can seal the wear said inner tube structure second sealing via, and the outer tube pipe nipple is located at described the
Two sealing vias top axially through be provided with diameter dimension more than said inner tube structure outer diameter size outer pipe nipple
Heat preservation hole, the outer tube keep the temperature energy between the side wall and the outer wall of said inner tube structure of using hole, the outer pipe nipple heat preservation hole
Constitute the vacuum heat-insulating layer.
2. geothermal well double-layered vacuum heat-insulation structure as described in claim 1, it is characterised in that：Said inner tube structure includes interior steel
The lower seal of pipe, the interior steel pipe connects inner tube pipe nipple, and the top seal of the interior steel pipe is worn vacuumizes knot by described
Structure, the lower part of said inner tube pipe nipple can seal to wear seals via by described second.
3. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 2, it is characterised in that：The second sealing via and institute
Outer pipe nipple heat preservation is stated with the downward tapered tapered guide face of diameter is provided between hole, is provided on the outer wall of said inner tube pipe nipple
The inner tube conical surface of setting is matched with the tapered guide face, the length dimension for being located at 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.
4. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 2, 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.
5. geothermal well double-layered vacuum heat-insulation structure as claimed in claim 4, 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.
6. geothermal well double-layered vacuum heat-insulation structure as described in claim 1, it is characterised in that：The Vacuuming structure with it is described
First sealing via is connected by thread seal.
7. geothermal well double-layered vacuum heat-insulation structure as described in claim 1, it is characterised in that：The Vacuuming structure includes true
Empty pipe nipple, is provided at the top of the vacuum pipe nipple to seal to wear and seals via by the third of said inner tube structure, described
Vacuum pipe nipple is located at the perforation axially below of third sealing via, and to be provided with diameter dimension outer more than said inner tube structure
The vacuum heat-preserving hole of wall diameter dimension, the vacuum heat-preserving hole are connected to setting with the vacuum heat-insulating layer, and the vacuum is short
It is provided on the side wall of section and vacuumizes interface, described one end for vacuumizing interface is connected to setting, institute with the vacuum heat-preserving with hole
It states and vacuumizes the other end of interface and be connected to setting with vacuum pump.
8. geothermal well double-layered vacuum heat-insulation structure as described in claim 1, it is characterised in that：The bottom of the outer tube structure is set
It is equipped with the upward tapered plug mounting hole of diameter, the side wall with the plug mounting hole is provided on the outer wall of the underseal plug
The matched plug conical surface, removedly underseal plug described in sealed set in the plug mounting hole.
9. such as the application method of claim 1 to 8 any one of them geothermal well double-layered vacuum heat-insulation structure, which is characterized in that
Include the following steps：
Step a, before entering well, underseal plug is set by glue in outer tube pipe nipple bottom first, then by outer tube pipe nipple with
Outer steel pipe is tightly connected；
Step b, start tripping in outer tube structure, stop lowering operation after outer tube structure is lowered into suitable position, in pithead position
Fixed outer steel pipe；
Step c, by inner tube pipe nipple and interior fastener for connection, while sealing ring being installed on inner tube pipe nipple, starts into outer tube structure
Tripping in inner tube structure；
Step d, when inner tube pipe nipple is lowered into outer tube pipe nipple position, under the guiding of the tapered guide face of outer tube pipe nipple, inner tube pipe nipple
It entering in the second sealing via of outer tube pipe nipple, continues to transfer interior steel pipe, the bottom end 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 hole, outer pipe nipple heat preservation hole side wall and the outer wall of inner tube structure between constitute vacuum heat-insulating layer, well head fix inner tube
Structure；
Step d, Vacuuming structure sealing shroud is set on inner tube structure in well head, and the lower seal of Vacuuming structure is connected
In the top of outer tube structure, the other end for vacuumizing interface is connected to vacuum pump, it will be in vacuum heat-insulating layer by vacuum pump
Gas is extracted out to form vacuum；
Step e, underground heat quarrying apparatus is opened, inner cavity of the return water through inner tube structure, which is returned, drains into ground.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109708328B (en) * | 2018-12-29 | 2020-06-09 | 湖南达道新能源开发有限公司 | Manufacturing device and using method of geothermal pipeline heat-insulating layer |
| CN111102754A (en) * | 2020-01-09 | 2020-05-05 | 黑龙江省九0四环境工程勘察设计院 | High-efficient geothermal well structure |
| CN113531252B (en) * | 2021-06-29 | 2022-11-08 | 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2555394Y (en) * | 2002-07-05 | 2003-06-11 | 盘锦兴隆石化机械厂 | Vacuum thermal insulation heat pouring compensator |
| CN102704867B (en) * | 2012-06-08 | 2015-01-21 | 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 |
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