CN109630052A - Hydraulic control pressuring expansion pipe automatic expanding device - Google Patents
Hydraulic control pressuring expansion pipe automatic expanding device Download PDFInfo
- Publication number
- CN109630052A CN109630052A CN201811547246.5A CN201811547246A CN109630052A CN 109630052 A CN109630052 A CN 109630052A CN 201811547246 A CN201811547246 A CN 201811547246A CN 109630052 A CN109630052 A CN 109630052A
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- 239000007788 liquid Substances 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 25
- 230000037361 pathway Effects 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
Classifications
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
The present invention relates to a kind of hydraulic control pressuring expansion pipe automatic expanding devices, including two-position four-way valve reset spring, two-position four-way valve core, two-position four-way valve body, outer wall cylinder, central tube, accumulator piston, accumulator lower cover, first stage piston, chamber connector, second piston, three-level piston, expansion cone, upper slips cone, upper slips, upper slips collet, upper disc spring, upper slips support, lower slips cone, lower slips, lower slips collet, lower disc spring and lower slips support.In the present invention, it is provided with multistage chamber, can be realized effective supercharging effect, reduces ground construction pressure；The present invention is capable of a series of expansion processes of completely automatic realization expansion tube, is not needed complicated operating process, do not need manual operation and above mention central tube by the movement of two-position four-way valve.The present invention is stable and reliable in work, can guarantee construction safety, reduce the consumption of the energy.
Description
Technical field
The present invention relates to a kind of hydraulic control pressuring expansion pipe automatic expanding devices, belong to technical field of petroleum industry.
Background technique
Existing bulged tube technology is to make to expand by being moved upwardly or downwardly expansion cone to expansion cone direct weighting
Pipe is plastically deformed, to achieve the purpose that expanding, this expansion fashion needs biggish operation pressure, not only safety compared with
It is low, it is easy to produce major accident, and increase the consumption to the energy.Improved bulged tube technology is then to pass through increase
Chamber increases forced area, but needs sufficiently complex operation, and action is complicated.
Summary of the invention
To overcome problems existing for current bulged tube technology, it is automatically swollen that the present invention provides a kind of hydraulic control pressuring expansion pipe
Swollen device.
To achieve the goals above, technical scheme is as follows.
A kind of hydraulic control pressuring expansion pipe automatic expanding device, including two-position four-way valve reset spring, two-position four-way valve core,
Two-position four-way valve body, outer wall cylinder, central tube, accumulator piston, accumulator lower cover, first stage piston, chamber connector, second level
Piston, three-level piston, expansion cone, upper slips cone, upper slips, upper slips collet, upper disc spring, upper slips support, lower slips cone,
Lower slips, lower slips collet, lower disc spring and lower slips support are equipped with high-pressure channel and highly pressurised liquid phase in two-position four-way valve body
It is logical, it is provided with central tube intake channel on two-position four-way valve body and is connected with the center tube passage in centrally disposed pipe, is arranged
There is annulus access to be connected with annular space, be provided with upper pressure relief opening and lower pressure relief opening and the external world are connected directly, two-position four-way valve core
It is mounted on two-position four-way valve valve inner, two-position four-way valve core lower end is provided with two-position four-way valve control channel, two-position four-way
Two-position four-way valve high-pressure channel on valve body is directly connected to highly pressurised liquid, directly controls with two-position four-way valve by first stage piston
Channel is connected, and two-position four-way valve reset spring is mounted on the upper end of two-position four-way valve core, and central tube is made of four sections of central tubes,
It is connected between each section of central tube by pipe screw thread, central tube is respectively arranged with level-one chamber feed pathway, secondary cavity feed liquor
Channel, three-level chamber feed pathway connect three-level chamber using sealing ring, and annular space, each chamber are formed between outer wall cylinder and cavity
Be connected by the chamber liquid outlet channel of setting with annular space, opened between first stage piston and cavity first stage piston annular space directly with two
Four-way valve high-pressure channel and two-position four-way valve control channel communicate, and are provided with accumulator feed pathway, and accumulator includes accumulation of energy
Device piston, accumulator piston are equipped with sealing ring, and accumulator lower end is equipped with accumulator lower cover, equipped with sealing between central tube
Circle, first stage piston chamber are connected with second piston chamber by chamber connector, and chamber connector top is level-one chamber, lower part two
Grade chamber, and be provided with level-one chamber liquid outlet channel and be connected with annular space, annular space is formed between outer wall cylinder and cavity, each chamber is logical
The chamber liquid outlet channel for crossing setting is connected with annular space.
Further, it is connected between two-position four-way valve body and outer wall cylinder by screw thread, two-position four-way valve body and chamber
It is connected between body by pipe screw thread, accumulator lower cover is fixed on first stage piston by pipe screw thread, and accumulator piston is mounted in storage
In energy device chamber, first stage piston, second piston, three-level piston are fixed by pipe screw thread and central tube, and piston is mounted in chamber,
Sealing ring is housed between cavity, opposite sliding, is equipped with sealing ring, expansion cone and outer wall cylinder and chamber between cavity and central tube
Body is threadably secured, and three-level chamber liquid outlet channel is provided in expansion cone, equipped with sealing between expansion cone and central tube
Circle.
Further, expansion cone lower end is connected through a screw thread upper slips cone, and upper slips cone lower end connects upper slips, on
Slips is then in contact with upper slips collet, does not contact between upper slips collet and central tube, and upper slips support and upper slips cone are logical
It crosses screw thread to be connected, and is not fixed between upper slips support and upper slips cone and central tube, and sealing ring sealing, upper dish are set
Spring is mounted between upper slips support and upper slips collet, by pushing upper slips collet to expand upper slips, is connect with expansion tube
Touching, moves upwards entire upper slips, expansion cone, outer wall cylinder, cavity, two-position four-way valve.
Further, lower slips cone is mutually fixed with central tube by screw thread, and lower end is in contact with lower slips, lower slips bottom
Support is placed on lower slips lower part, and does not contact between lower slips collet and central tube, and lower slips support is connected through a screw thread fixation
In the bottom of central tube, lower disc spring is mounted between lower slips support and lower slips collet, under pushing lower slips collet to make
Slips expands, and contacts with expansion tube, and entire lower slips, central tube is made to determine upward movement.
Invention has the beneficial effects that: in the present invention, it is provided with multistage chamber, can be realized effective supercharging effect,
Reduce ground construction pressure；The present invention completely automatic can realize a series of of expansion tube by the movement of two-position four-way valve
Expansion process does not need complicated operating process, does not need manual operation and above mention central tube.Stable and reliable in work, energy of the invention
Enough guarantee construction safety, reduces the consumption of the energy.
Detailed description of the invention
Fig. 1 is hydraulic control pressuring expansion pipe automatic expanding device entirety installation diagram；
Fig. 2 is hydraulic control pressuring expansion pipe automatic expanding device entirety sectional view；
Fig. 3 is hydraulic control pressuring expansion pipe automatic expanding device two-position four-way valve front sectional view；
Fig. 4 is hydraulic control pressuring expansion pipe automatic expanding device two-position four-way valve left view cross-sectional view；
Fig. 5 is hydraulic control pressuring expansion pipe automatic expanding device center tube structure figure；
Fig. 6 is hydraulic control pressuring expansion pipe automatic expanding device first stage piston internal structure chart；
Fig. 7 is hydraulic control pressuring expansion pipe automatic expanding device chamber connecting-piece structure figure.
In figure: 1, two-position four-way valve reset spring, 2, two-position four-way valve core, 3, two-position four-way valve body, 4, outer wall cylinder,
5, central tube, 6, accumulator piston, 7, accumulator lower cover, 8, first stage piston, 9, chamber connector, 10, second piston, 11,
Three-level piston, 12, expansion cone, 13, upper slips cone, 14, upper slips, 15, upper slips collet, 16, upper disc spring, 17, upper slips
Support, 18, lower slips cone, 19, lower slips, 20, lower slips collet, 21, lower disc spring, 22, lower slips support, 301, high-pressure channel,
302, central tube intake channel, 303, annulus access, 304, two-position four-way valve high-pressure channel, 305, upper pressure relief opening, 306, under let out
Press mouth, 307, two-position four-way valve control channel, 501, center tube passage, 502, level-one chamber feed pathway, 503, secondary cavity
Feed pathway, 504, three-level chamber feed pathway, 505, sealing ring, 801, first stage piston annular space, 802, accumulator feed pathway,
803, sealing ring, 901, level-one chamber, 902, level-one chamber liquid outlet channel, 903, secondary cavity.
Specific embodiment
A specific embodiment of the invention is described below with reference to embodiment, to better understand the present invention.
Embodiment
The hydraulic control pressuring expansion pipe automatic expanding device as shown in FIG. 1 to FIG. 7, including two-position four-way valve reset spring 1, two
Position four-way valve spool 2, two-position four-way valve body 3, outer wall cylinder 4, central tube 5, accumulator piston 6, accumulator lower cover 7, level-one
Piston 8, chamber connector 9, second piston 10, three-level piston 11, expansion cone 12, upper slips cone 13, upper slips 14, upper slips
Collet 15, upper disc spring 16, upper slips support 17, lower slips cone 18, lower slips 19, lower slips collet 20, lower disc spring 21 and lower card
Watt support 22 is equipped with high-pressure channel 301 in two-position four-way valve body 3 and communicates with highly pressurised liquid, and passes through two-position four-way valve core 2
The flow direction of action control highly pressurised liquid is provided with central tube intake channel 302 and centrally disposed pipe on two-position four-way valve body 3
Center tube passage 501 in 5 is connected, is provided with annulus access 303 is connected with annular space, be provided with upper pressure relief opening 305 and under let out
Pressure mouth 306 is connected directly with the external world, and two-position four-way valve core 2 is mounted on inside two-position four-way valve body 3, two-position four-way valve core
2 lower ends are provided with two-position four-way valve control channel 307, and the two-position four-way valve high-pressure channel 304 on two-position four-way valve body 3 is direct
Highly pressurised liquid is connected, is directly connected with two-position four-way valve control channel 307 by first stage piston 8, for controlling two-position four-way valve
The movement of spool 2, two-position four-way valve reset spring 1 is mounted on the upper end of two-position four-way valve core 2, for controlling two-position four-way valve
The movement of spool 2, when two-position four-way valve control channel 307 is without highly pressurised liquid, two-position four-way valve core 2 is answered by two-position four-way valve
Position spring 1 is depressed into lower end, and when two-position four-way valve control channel 307 is there are when highly pressurised liquid, two-position four-way valve core 2 is in
End, central tube 5 are made of four sections of central tubes, are connected between each section of central tube by pipe screw thread, central tube 5 is respectively arranged with one
Grade chamber feed pathway 502, secondary cavity feed pathway 503, three-level chamber feed pathway 504 are using the connection of sealing ring 505 three
Grade chamber forms annular space between outer wall cylinder 4 and cavity, each chamber is connected by the chamber liquid outlet channel of setting with annular space, and one
Grade piston 8 and cavity between opened first stage piston annular space 801 directly with two-position four-way valve high-pressure channel 304 and two-position four-way valve control
Channel 307 processed communicates, and is provided with accumulator feed pathway 802, and accumulator includes accumulator piston 6, and accumulator piston 6 is installed
There is sealing ring 803, accumulator lower end is equipped with accumulator lower cover 7, and sealing ring, first stage piston chamber and two are housed between central tube
Grade plunger shaft is connected by chamber connector 9, and 9 top of chamber connector is level-one chamber 901, and lower part is secondary cavity 903, and
It is connected provided with level-one chamber liquid outlet channel 902 with annular space, forms annular space between outer wall cylinder 4 and cavity, each chamber is by setting
The chamber liquid outlet channel set is connected with annular space.
It is connected between two-position four-way valve body 3 and outer wall cylinder 4 by screw thread, between two-position four-way valve body 3 and cavity
It is connected by pipe screw thread, accumulator lower cover 7 is fixed on first stage piston 8 by pipe screw thread, and accumulator piston 6 is mounted in accumulator
In chamber, first stage piston 8, second piston 10, three-level piston 11 are fixed by pipe screw thread and central tube 5, and piston is mounted on
In chamber, sealing ring is housed between cavity, opposite sliding between cavity and central tube is equipped with sealing ring, expansion cone 12 and outer
Wall cylinder 4 and cavity are threadably secured, and three-level chamber liquid outlet channel, expansion cone 12 and center are provided in expansion cone 12
Sealing ring is housed between pipe.
12 lower end of expansion cone is connected through a screw thread upper slips cone 13, and 13 lower end of upper slips cone connects upper slips 14, on
Slips 14 is then in contact with upper slips collet 15, does not contact between upper slips collet 15 and central tube 5, upper slips support 17 and upper card
Watt cone 13 is connected by screw thread, and is not fixed between upper slips support 17 and upper slips cone 13 and central tube 5, and be arranged
Sealing ring sealing, upper disc spring 16 are mounted between upper slips collet 15 and upper slips support 17, by pushing upper slips collet 15 to make
Upper slips 14 expand, and contact with expansion tube, make entire upper slips 14, expansion cone 12, outer wall cylinder 4, cavity, two-position four-way valve to
Upper movement.
Lower slips cone 18 is mutually fixed with central tube 5 by screw thread, and lower end is in contact with lower slips 19, lower slips collet 20
It is placed on 19 lower part of lower slips, and is not contacted between lower slips collet 20 and central tube 5, lower slips support 22 is connected through a screw thread
It is fixed on the bottom of central tube 5, lower disc spring 21 is mounted between lower slips support 22 and lower slips collet 20, by pushing lower card
Watt collet 20 expands lower slips 19, contacts with expansion tube, moves upwards entire lower slips 19, central tube 5.
The application method of above-mentioned hydraulic control pressuring expansion pipe automatic expanding device is as follows:
Hydraulic control pressuring expansion pipe automatic expanding device is entirely run in first, under original state, two-position four-way valve
Spool 2 is in bottom under the action of two-position four-way valve 1 power of reset spring, and highly pressurised liquid is by high-pressure channel 301 through two four
Port valve and central tube intake channel 302 enter in center tube passage 501, then enter one by the chamber feed pathway of central tube
Grade piston 8,11 top of second piston 10 and three-level piston, since upper slips 14 and expansion cone 12 are relatively fixed, 19 He of lower slips
Central tube 5 is connected, and move upwards expansion cone 12 and central tube 5 all can only, after highly pressurised liquid enters chambers at different levels, expansion cone 12
Expansion tool cavity and entire two-position four-way valve body 3 is driven to move upwards；Meanwhile first stage piston 8, second piston 10 and three
The liquid of 11 lower part of grade piston is then flowed out by each piston chamber's liquid outlet channel, into annulus access 303, eventually by lower pressure relief opening
306 discharges.Accumulator original state on first stage piston 8 is light condition, and accumulator piston 6 is in bottom, when on cavity
After shifting makes highly pressurised liquid flow into first stage piston annular space 801 by two-position four-way valve high-pressure channel 304, and then pass through accumulator feed liquor
After channel 802 flows into accumulator inside, accumulator piston 6 is pushed to move upwards, accumulator starts accumulation of energy, until cavity rises to
Contacted with piston base and accumulator accumulation of energy after the completion of, the highly pressurised liquid flowed by two-position four-way valve high-pressure channel 304 can flow
Enter two-position four-way valve control channel 307, thus overcome two-position four-way valve reset spring 1 push dynamic two-position four-way valve core 2 to
Upper movement, and this position can be kept since highly pressurised liquid exists always in next a period of time two-position four-way valve core 2
It is constant.
Next, highly pressurised liquid is then entered the annular space of cavity and outer wall cylinder 4 by high-pressure channel 301 by annulus access 303
Area, highly pressurised liquid flow into 11 lower part of first stage piston 8, second piston 10 and three-level piston simultaneously by each chamber liquid outlet channel,
Due to the presence of upper slips 14, cavity and expansion cone 12 and entire two-position four-way valve body 3 are not moved, central tube 5 drive with
Connected first stage piston 8, second piston 10 and three-level piston 11 move upwards, the liquid of upper piston area be then by chamber into
Liquid channel inflow center tube passage 501, eventually passes through central tube intake channel 302 and upper pressure relief opening 305 is discharged, and works as first stage piston
Rise, when first stage piston annular space 801 and two-position four-way valve high-pressure channel 304 are not communicated with, highly pressurised liquid input truncation, accumulator is lived
Plug 6 moves downward, and accumulator continues to energize, and two-position four-way valve reset spring 1 is still in compressive state, until accumulator exoergic is complete
When complete and piston stroking upward to vertex, under the effect of two-position four-way valve reset spring 1, two-position four-way valve core 2 declines, and is returned to
Original state, a cycle work are completed.
The gradually movement that expansion cone is realized by cycling, is finally completed entire expansion process.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (4)
1. a kind of hydraulic control pressuring expansion pipe automatic expanding device, it is characterised in that: including two-position four-way valve reset spring, two four
Port valve spool, two-position four-way valve body, outer wall cylinder, central tube, accumulator piston, accumulator lower cover, first stage piston, chamber connect
Fitting, second piston, three-level piston, expansion cone, upper slips cone, upper slips, upper slips collet, upper disc spring, upper slips support, under
Slips cone, lower slips, lower slips collet, lower disc spring and lower slips support are equipped with high-pressure channel in the two-position four-way valve body
It is communicated with highly pressurised liquid, the center in central tube intake channel and centrally disposed pipe is provided on the two-position four-way valve body
Tube passage is connected, is provided with annulus access is connected with annular space, be provided with upper pressure relief opening and lower pressure relief opening and the external world is connected directly,
The two-position four-way valve core is mounted on two-position four-way valve valve inner, and two-position four-way valve core lower end is provided with two four
Port valve control channel, the two-position four-way valve high-pressure channel on the two-position four-way valve body is directly connected to highly pressurised liquid, by one
Grade piston is directly connected with two-position four-way valve control channel, and the two-position four-way valve reset spring is mounted on two-position four-way valve core
Upper end, the central tube is made of four sections of central tubes, is connected between each section of central tube by pipe screw thread, the central tube point
Be not provided with level-one chamber feed pathway, secondary cavity feed pathway, three-level chamber feed pathway, on the central tube three into
Liquid channel is connected with three chambers respectively, and annular space, the chamber that each chamber passes through setting are formed between the outer wall cylinder and cavity
Room liquid outlet channel is connected with annular space, be provided between the first stage piston and cavity first stage piston annular space directly with two-position four-way valve height
Pressure passageway and two-position four-way valve control channel communicate, and are provided with accumulator feed pathway, and the accumulator includes that accumulator is living
Plug, the accumulator piston are equipped with sealing ring, and the accumulator lower end is equipped with accumulator lower cover, is equipped between central tube
Sealing ring, the first stage piston chamber are connected with second piston chamber by chamber connector, and chamber connector top is level-one chamber,
Lower part is secondary cavity, and is provided with level-one chamber liquid outlet channel and is connected with annular space, annular space is formed between outer wall cylinder and cavity, respectively
A chamber is connected by the chamber liquid outlet channel of setting with annular space.
2. a kind of hydraulic control pressuring expansion pipe automatic expanding device according to claim 1, it is characterised in that: described two four
It is connected between port valve valve body and outer wall cylinder by screw thread, is connected between the two-position four-way valve body and cavity by pipe screw thread
It connecing, the accumulator lower cover is fixed on first stage piston by pipe screw thread, and the accumulator piston is mounted in accumulator chamber,
The first stage piston, second piston, three-level piston are fixed by pipe screw thread and central tube, and piston is mounted in chamber, with cavity
Between sealing ring is housed, opposite sliding, is equipped with sealing ring between cavity and central tube, and expansion cone passes through with outer wall cylinder and cavity
It is screwed, and is provided with three-level chamber liquid outlet channel in expansion cone, sealing ring is housed between expansion cone and central tube.
3. a kind of hydraulic control pressuring expansion pipe automatic expanding device according to claim 1, it is characterised in that: the expansion cone
Lower end is connected through a screw thread upper slips cone, and upper slips cone lower end connects upper slips, the upper slips then with upper slips
Collet is in contact, and does not contact between the upper slips collet and central tube, and the upper slips support and upper slips cone pass through screw thread
It is connected, and is not fixed between upper slips support and upper slips cone and central tube, and sealing ring sealing is set, upper disc spring installation
Between upper slips collet and upper slips support, by pushing upper slips collet to expand upper slips, contacts, make whole with expansion tube
A upper slips, expansion cone, outer wall cylinder, cavity, two-position four-way valve determine upward movement.
4. a kind of hydraulic control pressuring expansion pipe automatic expanding device according to claim 1, it is characterised in that: the lower slips
Cone is mutually fixed with central tube by screw thread, and lower end is in contact with lower slips, and lower slips collet is placed on lower slips lower part, and
It not being contacted between lower slips collet and central tube, the lower slips support is connected through a screw thread the bottom for being fixed on central tube, under
Disc spring is mounted between lower slips support and lower slips collet, by pushing lower slips collet to expand lower slips, with expansion tube
Contact, makes entire lower slips, central tube determine upward movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547246.5A CN109630052B (en) | 2018-12-18 | 2018-12-18 | Automatic expansion device of hydraulic control pressurization expansion pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547246.5A CN109630052B (en) | 2018-12-18 | 2018-12-18 | Automatic expansion device of hydraulic control pressurization expansion pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109630052A true CN109630052A (en) | 2019-04-16 |
| CN109630052B CN109630052B (en) | 2021-02-26 |
Family
ID=66074907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811547246.5A Expired - Fee Related CN109630052B (en) | 2018-12-18 | 2018-12-18 | Automatic expansion device of hydraulic control pressurization expansion pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109630052B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153199A (en) * | 2021-05-21 | 2021-07-23 | 长江大学 | Hydraulic traction type expansion casing patching device |
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2018
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| RU2015300C1 (en) * | 1992-02-21 | 1994-06-30 | Олег Александрович Ледяшов | Device for installation of metal patch in casing string |
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| CN202970608U (en) * | 2012-11-12 | 2013-06-05 | 中国石油天然气股份有限公司 | expansion pipe |
| CN206554893U (en) * | 2017-02-16 | 2017-10-13 | 中国石油化工股份有限公司 | Thin-walled expansion pipe device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153199A (en) * | 2021-05-21 | 2021-07-23 | 长江大学 | Hydraulic traction type expansion casing patching device |
| CN113153199B (en) * | 2021-05-21 | 2023-02-28 | 长江大学 | Hydraulic traction type expansion casing patching device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109630052B (en) | 2021-02-26 |
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