CN104975814B - Instlated tubular and its gas injection tube column - Google Patents
Instlated tubular and its gas injection tube column Download PDFInfo
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- CN104975814B CN104975814B CN201510386403.9A CN201510386403A CN104975814B CN 104975814 B CN104975814 B CN 104975814B CN 201510386403 A CN201510386403 A CN 201510386403A CN 104975814 B CN104975814 B CN 104975814B
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- inner tube
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- instlated tubular
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Abstract
A kind of instlated tubular of disclosure and its gas injection tube column, the instlated tubular include：Outer tube, it has outer tube first end and the end of outer tube second；Inner tube in the outer tube, it has inner tube first end and the end of inner tube second；Said inner tube first end is provided with external screw thread, and the end of said inner tube second is provided with the internal thread and external screw thread being engaged with the external screw thread of said inner tube first end；Hold-down ring, it is slideably set in outside said inner tube first end；There is annular space between the hold-down ring and said inner tube, the graphite-seal ring that sealing is set on said inner tube outer wall is provided with the annular space；The hold-down ring can drive the graphite-seal ring to be slided towards said inner tube first end；The annular space has opening close to one end of said inner tube first end.The hold-down ring is provided with the internal thread being engaged with the external screw thread at the end of said inner tube second.The application, which provides instlated tubular and its gas injection tube column, can be advantageous to improve the effect of heat insulation of whole gas injection tube column.
Description
Technical field
The application is related to field of heavy oil thermal recovery, more particularly to a kind of instlated tubular and its gas injection tube column.
Background technology
Viscosity is big, heavy crude oil is referred to as viscous crude.The viscosity of viscous crude can significantly change with temperature change, experiment
Show, for viscous crude, if temperature increases by 8~9 DEG C, its viscosity can reduce half.Therefore, the exploitation to viscous crude, conveying, are adopted more
Its viscosity is reduced with heating power：It is the main of current petroleum industry heavy crude producing by injecting high-temperature steam to the heavy oil tested layer of underground
Technical measures, it is commonly called as " the steam soak method of heavy crude heat extraction " or " steam drive method ".
To underground inject high temperature (200 DEG C~350 DEG C) steam when, in order to reduce the loss of its heat, reduce thermal recovery into
This, the gas injection tube column that generally use is formed with multiple instlated tubulars at present.Currently used instlated tubular designs for bimetallic tube, and its is usual
Including outer tube, body inner tube.Outer tube is to be coaxially disposed with body inner tube.It is heat-insulated formed with body between outer tube and body inner tube
Chamber, and vacuumize process is carried out to body heat-insulation chamber.Form gas injection tube column when, more instlated tubulars join end to end, it is two neighboring every
Heat pipe provided with box cupling sealer by being thermally shielded sealed connection.Box cupling sealer is located at the junction of two neighboring instlated tubular
Outside, during the connection of two neighboring instlated tubular, the connection ends of two instlated tubulars stretches in box cupling sealer and close in box cupling
Sealing in device and connect, constantly screwed in the end of instlated tubular, two instlated tubulars compress the heat-insulating and sealing set of box cupling sealer, until
Complete the connection of two neighboring instlated tubular.
Above-mentioned instlated tubular is in connection procedure, because the connection end of two neighboring instlated tubular connects in box cupling sealer,
Staff can not observe directly the connection of two instlated tubulars, it is difficult to know whether two instlated tubulars compress heat-insulating and sealing
Cover, and then the situation that the junction that two neighboring instlated tubular easily occurs is poorly sealed, when this allows for steam by junction,
Steam is in easily turbulent shape, and serious heat can be occurred in box cupling junction by, which causing, scatters and disappears, and in turn results in whole gas injection tube column
Effect of heat insulation is poor.
The content of the invention
In view of the deficiencies in the prior art, the application provides a kind of instlated tubular and its gas injection tube column, whole to be advantageous to improve
The effect of heat insulation of gas injection tube column.
To reach above-mentioned purpose, the application provides a kind of instlated tubular, including：
Outer tube, it has outer tube first end and the end of outer tube second；
Inner tube in the outer tube, it has by the inner tube first end of outer tube first end stretching and by described outer
The end of inner tube second that the end of pipe second is stretched out；The outer tube first end and the sealing of the outer wall of the end of the outer tube second and said inner tube are solid
Fixed connection；There is vacuum heat-insulation space between the outer tube and said inner tube；Said inner tube first end is provided with external screw thread, described interior
The end of pipe second is provided with the internal thread and external screw thread being engaged with the external screw thread of said inner tube first end；
Hold-down ring, it is slideably set in outside said inner tube first end；Have between the hold-down ring and said inner tube
Annular space, the interior graphite-seal ring for being provided with sealing and being set on said inner tube outer wall of the annular space；The hold-down ring can drive described
Graphite-seal ring slides towards said inner tube first end；The annular space has opening close to one end of said inner tube first end.It is described
Hold-down ring is provided with the internal thread being engaged with the external screw thread at the end of said inner tube second.
As preferred embodiment, the graphite-seal ring along said inner tube it is axially arranged have it is multiple.
As preferred embodiment, the one end of the hold-down ring away from said inner tube first end is provided with step, described
Rank provides upper projecting face for the graphite-seal ring.
As preferred embodiment, outer tube the second end sealing welding is on the outer wall of said inner tube.
It is provided with and is set on outer tube as preferred embodiment, between the outer wall of the outer tube first end and said inner tube
Gasket ring, the gasket ring and the outer tube and said inner tube sealing welding.
As preferred embodiment, the gasket ring close to one end of said inner tube first end and the outer tube and it is described in
The seal of tube welds, the one end of the gasket ring away from said inner tube first end and said inner tube sealing welding.
As preferred embodiment, the pressure in the vacuum heat-insulation space is less than 0.1 pa.
The application also provides a kind of gas injection tube column, including：
Multiple as above any described instlated tubular；In the two neighboring instlated tubular, one of them instlated tubular it is interior
Pipe first end and hold-down ring are threadedly coupled with the end of inner tube second of another instlated tubular；It is close that the hold-down ring compresses the graphite
Seal ring with by the junction of the two neighboring instlated tubular seal.
As preferred embodiment, the junction of the two neighboring instlated tubular is arranged with clip, the clip
Heat-barrier material is filled between the junction of the two neighboring instlated tubular.
As preferred embodiment, the clip includes the semicircular cylinder that two ends are provided with latch, two semicircles
Cylinder is engaged by the latch and by being fixed provided with steady pin.
By above description as can be seen that instlated tubular provided herein passes through provided with the hold-down ring and sealing shroud
The graphite-seal ring being located on said inner tube outer wall, can be in the junction of two neighboring instlated tubular by individually adjusting hold-down ring
Contiguity with the end of inner tube second is that being fully sealed for two neighboring instlated tubular junction can be achieved, and is not susceptible to two neighboring
The poorly sealed situation in the junction of instlated tubular, and then be advantageous to improve the effect of heat insulation of whole gas injection tube column.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those skilled in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the instlated tubular structural representation that one embodiment of the application is provided；
Fig. 2 is the gas injection tube column structural representation that one embodiment of the application is provided；
Fig. 3 is a half-cylinder structure schematic diagram of the clip that one embodiment of the application is provided.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, it is real below in conjunction with the application
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example only some embodiments of the present application, rather than whole embodiments.It is common based on the embodiment in the application, this area
The every other embodiment that technical staff is obtained on the premise of creative work is not made, should all belong to guarantor of the present invention
The scope of shield.
Referring to Fig. 1, a kind of instlated tubular 100 that one embodiment of the application is provided, including：Outer tube 1, it has outer
Pipe first end 11 and the second end of outer tube 12；Inner tube 2 in the outer tube 1, it has is stretched out by the outer tube first end 11
Inner tube first end 21 and the second end of inner tube 22 for being stretched out by second end of outer tube 12；The outer tube first end 11 and described outer
The second end of pipe 12 and the outer wall of said inner tube 2 are sealedly and fixedly connected；There is vacuum heat-insulation between the outer tube 1 and said inner tube 2
Space 3；Said inner tube first end 21 is provided with external screw thread, and the second end of said inner tube 22 is provided with the outer spiral shell with said inner tube first end 21
The internal thread and external screw thread that line is engaged；Hold-down ring 4, it is slideably set in outside said inner tube first end 21；The compression
There is annular space 5, it is close to be provided with the graphite that sealing is set on the outer wall of said inner tube 2 in the annular space 5 between ring 4 and said inner tube 2
Seal ring 6；The hold-down ring 4 can drive the graphite-seal ring 6 to be slided towards said inner tube first end 21；The annular space 5 is close to institute
Stating one end of inner tube first end 21 has opening 51.The hold-down ring 4 is provided with to match with the external screw thread at the second end of said inner tube 22
The internal thread of conjunction.
Referring again to Fig. 2, when the instlated tubular 100 provided using present embodiment forms gas injection tube column, it is two neighboring every
In heat pipe 100, one of them instlated tubular 100a said inner tube first end 21 is described with another instlated tubular 100b's
The second end of inner tube 22 is threadedly coupled.Treat that the said inner tube first end 21 and instlated tubular 100b's of the instlated tubular 100a is described
After the threaded connection of the second end of inner tube 22 terminates, mobile instlated tubular 100a hold-down ring 4 cause the hold-down ring 4 with it is described heat-insulated
Pipe 100b screw thread (external screw thread) connection of the second end of said inner tube 22, with the hold-down ring 4 and the spiral shell at the second end of said inner tube 22
The increase of line connecting length, the hold-down ring 4 compress the graphite-seal ring 6 to the end of said inner tube second of the instlated tubular 100b
On 22 end face, and then the junction of the two neighboring instlated tubular is fully sealed.With this connected mode will it is multiple it is described every
Heat pipe is sequentially connected with the composition gas injection tube column.
By above description as can be seen that the instlated tubular 100 that is provided of present embodiment by provided with the hold-down ring 4 with
And sealing is set in the graphite-seal ring 6 on the outer wall of said inner tube 2, can pass through in the junction of two neighboring instlated tubular 100
Individually regulation hold-down ring 4 and the contiguity at the second end of inner tube 22 are the complete of the achievable two neighboring junction of instlated tubular 100
Sealing, is not susceptible to the poorly sealed situation in the junction of two neighboring instlated tubular 100, and then be advantageous to improve whole air injection pipe
The effect of heat insulation of post.
The outer tube 1 and the entirety of said inner tube 2 are tubulose, and to be coaxially disposed.In the outer tube 1, the outer tube
One end 11 and the second end of the outer tube 12 are connected on the outer wall of said inner tube 2.The length of the outer tube 1 is less than in described
The length of pipe 2, and then ensure that said inner tube first end 21 and the second end of said inner tube 22 are exposed by the outer tube 1.The outer tube
Second end 12 can reduce to form a connection step with internal diameter, by the connection step can ensure to have the larger vacuum every
Heat space 3, and then there is more preferable effect of heat insulation.
In said inner tube 2, it is adjacent to connect that said inner tube first end 21 and the second end of said inner tube 22 are equipped with screw thread
The inner tube first end 21 of other instlated tubulars 100 and the second end of inner tube 22.In view of usually used specification phase on same gas injection tube column
Same instlated tubular 100, in the instlated tubular 100, the institute of external screw thread and the instlated tubular 100 that said inner tube first end 21 opens up
The internal thread that the second end of inner tube 22 opens up is stated to be adapted, and then, the said inner tube first end 21 of current instlated tubular 100 can with it is same
The second end of inner tube 22 of the adjacent insulation pipe 100 of specification is threadedly coupled.
Specifically, said inner tube first end 21 is the bullet shunk towards port, the second end of said inner tube 22 is direction
The bullet of port expansion.The said inner tube first end 21 of current instlated tubular 100 can rotate the institute for stretching into another instlated tubular 100
State the second end of inner tube 22.The external thread length of said inner tube first end 21 is preset length, accordingly, said inner tube second
The internal thread length at end 22 is similarly preset length, and then when the two neighboring instlated tubular 100 connects, said inner tube first
It can stop screwing in work after the screwing into of external screw thread and second end of said inner tube 22 at end 21, quite convenient for operation
Personnel learn the mated condition of two adjacent insulation pipes 100.
The outer wall of said inner tube 2, to be sealedly and fixedly connected, enters with the outer tube first end 11 and the second end of the outer tube 12
And ensure that the vacuum heat-insulation space 3 can be formed between said inner tube 2 and the outer tube 1.The vacuum heat-insulation space 3 can
To be formed by air extractor pumped down, getter can also be put into the vacuum heat-insulation space 3 and forms vacuum state.Institute
The pressure stated in vacuum heat-insulation space 3 is less than 0.1 pa, to obtain preferable effect of heat insulation.
Please continue to refer to Fig. 1, second end of outer tube 12 can be with sealing welding on the outer wall of said inner tube 2.It is described outer
Can be provided between the outer wall of pipe first end 11 and said inner tube 2 and be set in gasket ring 7 on outer tube 1, the gasket ring 7 with it is described outer
Pipe 1 and the sealing welding of said inner tube 2.The gasket ring 7 is used to form the vacuum heat-insulation space 3 with the connection step, has
Body, the gasket ring 7 can be with the outer tube 1 and the sealing welding of said inner tube 2, institute close to one end of said inner tube first end 21
Stating the one end of gasket ring 7 away from said inner tube first end 21 can be with the sealing welding of said inner tube 2.The thickness of gasket ring 7 described in Fig. 1
Can be equal with the thickness in vacuum heat-insulation space 3 (along the length of the radial direction of inner tube 2).
It can be connected by finding out in Fig. 1 between the gasket ring 7 and said inner tube 2 and the outer tube 1 by angle welding.Together
When, the end face of the close said inner tube first end 21 of the gasket ring 7 can be that the hold-down ring 4 provides spacing place, when the pressure
When tight ring 4 touches the end face of the gasket ring 7, the gasket ring 7 can prevent the hold-down ring 4 from continuing towards the end of said inner tube second
22 movements.
The hold-down ring 4 is sheathed in said inner tube 2, specifically, the hold-down ring 4 is sheathed on said inner tube first end 21
On.The section of the hold-down ring 4 is integrally L-shaped.The hold-down ring 4 can sliding axially along said inner tube 2, in its part
Surface can be bonded with the outer surface of said inner tube 2.Formed with provided with the graphite between the hold-down ring 4 and said inner tube 2
The annular space 5 of sealing ring 6.The hold-down ring 4 can drive the graphite-seal ring 6 to move when being moved towards said inner tube first end 21
It is dynamic, and then graphite-seal ring 6 is pressed on the end face of the inner tube 2 of another instlated tubular 100.The opening 51 of the annular space 5
Towards said inner tube first end 21, the ring can be stretched into by the second end of inner tube 22 of 51 other instlated tubulars 100 of the opening
In sky 5, and then ensure that the graphite-seal ring 6 is pressed on the end face at second end of inner tube 22, ensure two neighboring instlated tubular
100 junction sealing.Specifically, the described one end of hold-down ring 4 away from said inner tube first end 21 is provided with step 41, described
Rank 41 is that the graphite-seal ring 6 provides upper projecting face.The step 41 is by the hold-down ring 4 away from said inner tube first end 21
One end internal diameter reduces to be formed, by the step 41, the hold-down ring 4 towards said inner tube first end 21 move when, described
Rank 41 can be such that the graphite-seal ring 6 is together moved with the hold-down ring 4 towards said inner tube first end 21.
The sealing of graphite-seal ring 6 is set in said inner tube 2, and it can follow the hold-down ring 4 to move and be pressed on
On the end face at the second end of inner tube 22 of another instlated tubular 100, and then the junction of two neighboring instlated tubular 100 is fully sealed.
Further, axial direction of the graphite-seal ring 6 along said inner tube 2 can be provided with multiple.Referring to Fig. 2, it can be seen that
The hold-down ring 4 towards said inner tube first end 21 move when, the step 41 gives the graphite-seal ring 6 to said inner tube
The thrust that first end 21 moves, and then the graphite-seal ring 6 is moved towards said inner tube first end 21.Meanwhile by phase
When adjacent two instlated tubulars 100 are dismantled, it is only necessary to after the hold-down ring 4 is rotated into dismounting, then rotate two instlated tubulars 100
Realize and disengage, disassembly procedure is simple and easy to operation.
Referring to Fig. 2, one embodiment of the application also provides a kind of gas injection tube column, the gas injection tube column includes：It is multiple such as
Instlated tubular 100 described in upper any embodiment；In the two neighboring instlated tubular 100, one of them instlated tubular 100
Inner tube first end 21 and hold-down ring 4 are threadedly coupled with the second end of inner tube 22 of another instlated tubular 100；The hold-down ring 4 is pressed
The tight graphite-seal ring 6 is so that the junction of the two neighboring instlated tubular 100 to be sealed.
To be further ensured that effect of heat insulation, the junction of the two neighboring instlated tubular 100 can be arranged with clip
201, it can be filled with heat-barrier material 200 between the clip 201 and the junction of the two neighboring instlated tubular 100.
The heat-barrier material 200 can use the one or more in the materials such as glass fibre, asbestos, aerogel blanket.The heat-insulated material
Material 200 can be located between the relative end of outer tube 1 of two neighboring instlated tubular 100, and then will whole two neighboring instlated tubular
100 junction is completely heat-insulated, farthest reduces heat and scatters and disappears.The heat-barrier material 200 generally both ends can coordinate
The rectangle of connection, when its curling is covered in the junction of the two neighboring instlated tubular 100, its both ends is connected, and then
Completion is arranged action.
Referring to Fig. 3, the clip 201 is used for the banding of heat-barrier material 200 described two neighboring described heat-insulated
The junction of pipe 100, its entirety are set in outside the heat-barrier material 200.Specifically, the clip 201 can wrap as shown in Figure 3
Semicircular cylinder 201a of two ends provided with latch 2011 is included, two semicircular cylinder 201a can be engaged by the latch 2011
And by being fixed provided with steady pin 202.The latch 2011 is located on the end of the both sides of the semicircular cylinder 201a, described in two
Semicircular cylinder 201a can form the columnar clip 201 by the latch 2011.Each latch 2011 is provided with edge
The through hole 2012 that the axial direction of the clip 201 is run through.On the end of the side of the semicircular cylinder 201a, each latch
The axis of through hole 2012 on 2011 overlaps, and then can pass through for the steady pin 202.Certainly, two semicircular cylinder 201a's
The axis that latch 2011 engages the through hole 2012 on the latch 2011 of latter two end still overlaps, now in the clip 201
Upper to form a through hole for axially running through clip 201 along the clip 201, the steady pin 202 is by stretching into described run through
In hole, two semicircular cylinder 201a are fixed together, and then form the clip 201, and the heat-barrier material 200 is bound round
Tightly.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement is both fallen within the scope of protection of present invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
- A kind of 1. instlated tubular, it is characterised in that including：Outer tube, it has outer tube first end and the end of outer tube second；Inner tube in the outer tube, it has the inner tube first end stretched out by the outer tube first end and by the outer tube the The end of inner tube second that two ends are stretched out；The outer tube first end and the fixed company of the outer wall of the end of the outer tube second and said inner tube sealing Connect；There is vacuum heat-insulation space between the outer tube and said inner tube；Said inner tube first end is provided with external screw thread, said inner tube Two ends are provided with the internal thread and external screw thread being engaged with the external screw thread of said inner tube first end；Hold-down ring, it is slideably set in outside said inner tube first end；There is annular space between the hold-down ring and said inner tube, The graphite-seal ring that sealing is set on said inner tube outer wall is provided with the annular space；The hold-down ring can drive the graphite close Seal ring is slided towards said inner tube first end；The annular space has opening close to one end of said inner tube first end；The hold-down ring The internal thread being engaged provided with the external screw thread with the end of said inner tube second.
- 2. instlated tubular as claimed in claim 1, it is characterised in that：The graphite-seal ring has along the axially arranged of said inner tube It is multiple.
- 3. instlated tubular as claimed in claim 1, it is characterised in that：The one end of the hold-down ring away from said inner tube first end is set There is step, the step provides upper projecting face for the graphite-seal ring.
- 4. instlated tubular as claimed in claim 1, it is characterised in that：Outer tube the second end sealing welding is in the outer of said inner tube On wall.
- 5. instlated tubular as claimed in claim 1, it is characterised in that：Set between the outer wall of the outer tube first end and said inner tube There are the gasket ring being set on outer tube, the gasket ring and the outer tube and said inner tube sealing welding.
- 6. instlated tubular as claimed in claim 5, it is characterised in that：The gasket ring is close to one end of said inner tube first end and institute State outer tube and said inner tube sealing welding, the one end of the gasket ring away from said inner tube first end and said inner tube sealing welding.
- 7. instlated tubular as claimed in claim 1, it is characterised in that：Pressure in the vacuum heat-insulation space is less than 0.1 pa.
- A kind of 8. gas injection tube column, it is characterised in that including：Multiple instlated tubulars as described in claim 1 to 7 is any；In the two neighboring instlated tubular, one of them is described heat-insulated The inner tube first end and hold-down ring of pipe are threadedly coupled with the end of inner tube second of another instlated tubular；Described in the hold-down ring compresses Graphite-seal ring with by the junction of the two neighboring instlated tubular seal.
- 9. gas injection tube column as claimed in claim 8, it is characterised in that：The junction of the two neighboring instlated tubular is arranged There is clip, heat-barrier material is filled between the clip and the junction of the two neighboring instlated tubular.
- 10. gas injection tube column as claimed in claim 9, it is characterised in that：The clip includes half that two ends are provided with latch Cylinder, two semicircular cylinders are engaged by the latch and by being fixed provided with steady pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386403.9A CN104975814B (en) | 2015-06-30 | 2015-06-30 | Instlated tubular and its gas injection tube column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386403.9A CN104975814B (en) | 2015-06-30 | 2015-06-30 | Instlated tubular and its gas injection tube column |
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| Publication Number | Publication Date |
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| CN104975814A CN104975814A (en) | 2015-10-14 |
| CN104975814B true CN104975814B (en) | 2018-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510386403.9A Active CN104975814B (en) | 2015-06-30 | 2015-06-30 | Instlated tubular and its gas injection tube column |
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| CN (1) | CN104975814B (en) |
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| CN204804704U (en) * | 2015-06-30 | 2015-11-25 | 中国石油天然气股份有限公司 | Thermal -insulated pipe and gas injection tubular column thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2716489Y (en) * | 2004-07-28 | 2005-08-10 | 中国石化胜利油田有限公司采油工艺研究院 | Freely telescopic ground gas injection pipe compensator |
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| RU2011122227A (en) * | 2011-06-02 | 2012-12-10 | Общество с ограниченной ответственностью "Советскнефтеторгсервис" | PIPE THERMAL ISOLATED PUMP-COMPRESSOR (TTNK) |
| CN202215220U (en) * | 2011-09-23 | 2012-05-09 | 中国石油天然气股份有限公司 | Concentric type lamination steam driving underground process tubular column |
| CN202441330U (en) * | 2012-02-28 | 2012-09-19 | 中国石油天然气集团公司 | Heat insulation oil tube device |
| CN102748009A (en) * | 2012-07-05 | 2012-10-24 | 中国地质大学（武汉） | High-temperature-resistant protective sleeve for probe tube, and manufacturing and application methods thereof |
| CN103321583A (en) * | 2013-07-05 | 2013-09-25 | 新疆华油油气工程有限公司 | Tubular pile momentum balancing device |
| CN203628153U (en) * | 2013-11-22 | 2014-06-04 | 中国石油天然气股份有限公司 | Prestressed vacuum thermal insulation pipe |
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| CN204804704U (en) * | 2015-06-30 | 2015-11-25 | 中国石油天然气股份有限公司 | Thermal -insulated pipe and gas injection tubular column thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104975814A (en) | 2015-10-14 |
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