CN111636840B - Reducing rolling type expansion pipe column and using method thereof - Google Patents
Reducing rolling type expansion pipe column and using method thereof Download PDFInfo
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- CN111636840B CN111636840B CN202010587553.7A CN202010587553A CN111636840B CN 111636840 B CN111636840 B CN 111636840B CN 202010587553 A CN202010587553 A CN 202010587553A CN 111636840 B CN111636840 B CN 111636840B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 title claims abstract description 14
- 238000003825 pressing Methods 0.000 claims abstract description 70
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000004080 punching Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000000875 corresponding effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims 2
- 238000001125 extrusion Methods 0.000 claims 1
- 238000007906 compression Methods 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000001771 impaired effect Effects 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037081 physical activity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 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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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a reducing rolling type expansion-compression pipe column and a using method thereof, wherein the reducing rolling type expansion-compression pipe column comprises a driving mechanism and an expansion-compression device, the driving mechanism is arranged at a sleeve wellhead, the driving mechanism comprises a hydraulic pump, a pressurization cylinder, a rotating device and a vertical moving device, the expansion-compression device is arranged on the driving mechanism, the rotating device and the moving device can respectively drive the expansion-compression device to rotate and vertically move, and the expansion-compression device comprises a pipe body, the pressurization cylinder arranged in the pipe body and a movable pressing block arranged in a staggered mode. The damaged part of sleeve pipe is carried out the punching press through the flexible motion of making a round trip of activity briquetting and is restoreed, at first corrects, heats, impact the type of moulding and the type is moulded to the secondary impact through the impact pressure in different stages to the sleeve pipe, through mutually supporting of a plurality of steps, can make the sleeve pipe restore to and improve the metal strength of damaged part, avoided the sleeve pipe secondary to appear impaired.
Description
Technical Field
The invention relates to the technical field of pipe column repairing equipment, in particular to a reducing rolling type expansion pipe column and a using method thereof.
Background
When the underground casing pipe of the oil-gas well is used, the deformation, abrasion and reduction of drift diameter of the casing pipe are often caused due to corrosion, earth crust movement and the like, so that the oil-gas well cannot work. The current technique mainly adopted for shaping the sleeve is as follows: shaping by a pear-shaped device, grinding and milling, and explosion shaping. The shaping technology of the pyriform device is that a tubular column is used for putting the pyriform device to a deformed position of a sleeve, and the sleeve is expanded in a striking mode. The milling technology is to grind or mill the deformed casing pipe, which can cause damage to the casing pipe. The common defect of the technologies is that the pipe column is pulled out and put down, so that the labor intensity of workers is high. Explosive shaping is to put explosive to the deformed position of the sleeve, ignite the explosive and burst the deformed sleeve, which can cause damage to the sleeve. According to the existing device and method, the casing is subjected to external force, so that the casing is thinned, and once secondary damage occurs, the casing is scrapped.
Disclosure of Invention
The invention mainly aims to provide a reducing rolling type expansion-compression pipe column and a using method thereof, aiming at ensuring the perfect repair of a sleeve and simultaneously avoiding damaging the stable structure of the sleeve, improving the metal stress of the damaged part and prolonging the service life of the sleeve by the method.
In order to achieve the above object, the present invention provides a reducing rolling type expansion pipe column, comprising:
the driving mechanism is arranged at a casing wellhead and comprises a hydraulic pump, a pressure cylinder, a rotating device and a vertical moving device;
the pipe body, the oil pipe, the expansion device, rotary device and mobile device can drive the expansion device respectively and make rotation and vertical removal, the expansion device includes the body, locates the pressure cylinder and the dislocation set's of pipe body activity briquetting, the pressure cylinder is connected with the hydraulic pump through oil pipe, the hydraulic pump can drive the horizontal migration of activity briquetting between the position that stretches out the body and the position that returns the body, oil pipe is equipped with the pressure relief ware.
Further, the body includes outer tube portion and inner tube portion, outer tube portion is located to the activity briquetting, oil pipe is located the inner tube portion and is connected with corresponding activity briquetting, be equipped with the hydraulic pressure expand tube between inner tube portion and the outer tube portion, the hydraulic pressure expand tube is connected with the hydraulic pump, the hydraulic pressure expand tube can be at the bloated state and return and switch over between the state of contracting, when the hydraulic pressure expand tube is in the bloated state, the hydraulic pressure expand tube forms the elastic connection between outer tube portion and the inner tube portion.
Furthermore, the movable pressing blocks are arranged in a plurality and are distributed radially at intervals along the axis of the pipe body, and the movable pressing blocks are made of high-temperature-resistant steel.
Furthermore, the outer pipe part is provided with a plurality of through grooves, and the movable briquetting hydraulic structure slides between a position extending out of the through grooves and a position retreating from the through grooves under the driving of the pressurizing cylinder and the hydraulic pump.
Furthermore, the cross section of the movable pressing block is rectangular.
Further, the bottom of the sleeve is conical.
The invention also provides a reducing rolling type expansion pipe column and a using method thereof, and the using method comprises the following steps:
s1: fixing a driving mechanism on a wellhead to be repaired;
s2: installing the expansion device on a driving mechanism;
s3: the vertical moving device drives the expansion device to extend into the well mouth to be repaired until the expansion device is positioned at the position to be repaired, and the vertical moving mechanism stops;
s4, starting a hydraulic pump, switching the hydraulic expansion pipe to an expansion state, and filling a gap between the outer pipe and the inner pipe;
s5: and opening the pressurizing cylinder to drive the movable pressing block to perform reciprocating horizontal movement so as to repeatedly press the sleeve.
Further, in S5, the sleeve is heated to 1000 to 1250 degrees celsius by repeatedly pressing the movable pressing block.
Further, the S5 includes:
the first stage is as follows: the extension part of the movable pressing block accounts for one third of the length of the movable pressing block, and the pressure of the movable pressing block is 0.5Mpa to 0.8 Mpa;
and a second stage: the movable pressing block is completely extended out, the pressure of the movable pressing block is 0.50.5MPa to 0.8MPa, and the stamping frequency is 300-500/min;
and a third stage: the movable pressing block is completely extended out, the pressure of the movable pressing block is 1Mpa to 1.5Mpa, and the stamping frequency is 280-360/min.
Further, after the step S5 is completed, the rotating device drives the pressure expanding device to rotate, and the steps S1, S2, S3, S4 and S5 are repeatedly performed.
The technical scheme of the invention has the beneficial effects that:
1. the driving mechanism is matched with the expansion device to realize that the sleeve can be conveniently and rapidly installed and repaired when the sleeve fails, specifically, the movable pressing block is driven by the pressure cylinder and the hydraulic pump, the damaged part of the sleeve is punched and repaired by the back-and-forth telescopic motion of the movable pressing block, firstly, the sleeve is corrected, heated, impact molded and secondarily impact molded by the impact pressure in different stages, and the sleeve can be repaired and the metal strength of the damaged part is improved by the mutual matching of a plurality of steps, so that the secondary damage of the sleeve is avoided;
2. the movable pressing block is arranged in a rectangular shape, so that the punching area can be effectively increased, the processing and the installation are convenient, and under the driving of the hydraulic pump, the driving steps of the movable pressing block are more uniform, and the cooperation performance is higher;
3. the hydraulic expansion pipe can be switched between an expansion state and a retraction state, when the hydraulic expansion pipe is in the expansion state, the hydraulic expansion pipe forms elastic connection between the outer pipe part and the inner pipe part, when the movable pressing block repeatedly presses the sleeve, the hydraulic expansion pipe can effectively absorb the movable pressing block and stress generated by the movable pressing block and the sleeve in a propping mode, damage to an expansion device can be avoided, and rebound caused by the sleeve is reduced.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a schematic view of the present invention in cooperation with a cannula;
fig. 3 is a schematic cross-sectional view of the expansion device.
In the figure: the hydraulic expansion pipe comprises a driving mechanism 1, an expansion device 2, a pipe body 3, an outer pipe portion 31, an inner pipe portion 32, a pressurizing cylinder 4, a movable pressing block 5, a through groove 51, an oil pipe 6, a pressure relief device 7, a hydraulic pump 8, a hydraulic expansion pipe 9 and a sleeve 100.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as … …, which is up, down, left, right, front, back, top, bottom, inner, outer, vertical, transverse, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are provided in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship, motion condition, etc. of the components at a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a reducing rolling type expansion pipe column.
In an embodiment of the present invention, as shown in fig. 1 to 3, the reducing rolling type expansion pipe column includes:
the driving mechanism 1 is arranged at a casing wellhead, and the driving mechanism 1 comprises a hydraulic pump 8, a pressure cylinder 4, a rotating device and a vertical moving device;
the pipe expanding device comprises an expanding device 2, wherein the expanding device 2 is installed in a driving mechanism 1, the rotating device and a moving device can respectively drive the expanding device 2 to rotate and vertically move, the expanding device 2 comprises a pipe body 3, a pressure cylinder 44 arranged in the pipe body 3 and a movable pressing block 5 arranged in a staggered mode, the pressure cylinder 44 is connected with a hydraulic pump 8 through an oil pipe 6, the hydraulic pump 8 can drive the movable pressing block 5 to horizontally move between a position extending out of the pipe body 3 and a position returning back to the pipe body 3, and the oil pipe 6 is provided with a pressure relief device 7.
The driving mechanism 1 and the expansion device 2 are matched to realize that the sleeve can be conveniently and rapidly installed and repaired when the sleeve fails, specifically, the pressure cylinder 4 and the hydraulic pump 8 drive the movable pressing block 5, the damaged part of the sleeve is punched and repaired through the back-and-forth telescopic motion of the movable pressing block 5, the sleeve is firstly corrected, heated, impact molded and secondarily impact molded through impact pressure in different stages, and the sleeve can be repaired through the mutual matching of a plurality of steps, so that the metal strength of the damaged part is improved, and the secondary damage of the sleeve is avoided.
Further, body 3 includes outer tube portion 31 and inner tube portion 32, outer tube portion 31 is located to activity briquetting 5, oil pipe 6 is located inner tube portion 32 and is connected with corresponding activity briquetting 5, be equipped with hydraulic pressure expand tube 9 between inner tube portion 32 and the outer tube portion 31, hydraulic pressure expand tube 9 is connected with hydraulic pump 8, hydraulic pressure expand tube 9 can switch between the bloated state and the state of retracting, when hydraulic pressure expand tube 9 is in the bloated state, hydraulic pressure expand tube 9 forms the elastic connection between outer tube portion 31 and the inner tube portion 32, when activity briquetting 5 repeated to the sleeve pipe punching press, hydraulic pressure expand tube 9 can effectively absorb the stress that activity briquetting 5 and activity briquetting 5 offset the production with the sleeve pipe, can avoid the damage of bloated pressure equipment 2 and reduce the bounce that the sleeve pipe should produce because.
Further, a plurality of movable pressing blocks 5 are arranged and radially distributed at intervals along the axis of the pipe body 3, the movable pressing blocks 5 are made of high-temperature-resistant steel, and specifically, the number of the movable pressing blocks 5 is 8 and the movable pressing blocks are arranged at intervals along the length direction of the pipe body 3.
Further, the outer tube portion is provided with a plurality of through grooves 51, and the movable press block 5 is hydraulically structured to slide between a position protruding out of the through grooves 51 and a position retreating out of the through grooves 51, driven by the pressure cylinder 4 and the hydraulic pump 8. The specific working mode of the movable pressing block 5 can refer to the prior art, wherein the telescopic length and the telescopic frequency of the movable pressing block 5 are generally controlled by the hydraulic pump 8.
Further, the cross section of the movable pressing block 5 is rectangular, and certainly, the movable pressing block 5 can also be a spherical device, but according to the invention, the movable pressing block 5 is rectangular, so that the punching area can be effectively increased, the processing and the installation are convenient, and under the driving of the hydraulic pump 8, the driving steps of the movable pressing block 5 are more uniform, and the cooperation performance is higher.
Further, the bottom of the sleeve is conical.
The invention also provides a reducing rolling type expansion-compression pipe column and a using method thereof, wherein the using method comprises the using method of the reducing rolling type expansion-compression pipe column, and when the method is used, a plurality of pressure sensors and infrared position sensing devices are generally arranged at the hydraulic pump 8, the movable pressing block 5 and the outer pipe part, so that the construction accuracy is improved, and the fault or problem can be found in time during repair.
S1: fixing the driving mechanism 1 on a wellhead to be repaired (wherein the driving mechanism 1 can be set by referring to the existing moving device, but the driving mechanism 1 is connected with a control system which is connected with a pressure sensor and an infrared position sensing device, so that problems can be found in the casing repairing process in time conveniently);
s2: installing the expansion device 2 on the driving mechanism 1 (i.e. aligning the expansion device 2 with the wellhead to facilitate the next step);
s3: the vertical moving device drives the pressure expansion device 2 to extend into a wellhead to be repaired until the pressure expansion device 2 is located at a position to be repaired, and the vertical moving mechanism stops (the movable pressing block 5 is aligned with the position to be repaired);
s4, starting the hydraulic pump 8, switching the hydraulic expansion pipe 9 to an expansion state, and filling a gap between the outer pipe and the inner pipe (when the movable pressing block 5 repeatedly presses the sleeve, the hydraulic expansion pipe 9 can effectively absorb the movable pressing block 5 and the stress generated by the movable pressing block 5 and the sleeve which are abutted against each other, so that the damage of the expansion device 2 can be avoided, and the rebound of the sleeve due to the stress can be reduced);
s5: and (3) starting the pressure cylinder 4, driving the movable pressing block 5 to perform reciprocating horizontal movement, and repeatedly punching the sleeve.
Further, in S5, the sleeve is heated to 1000 to 1250 degrees celsius by repeatedly pressing the movable press block 5.
Further, the S5 includes:
the first stage is as follows: the extension part of the movable pressing block 5 accounts for one third of the length of the movable pressing block, and the pressure of the movable pressing block 5 is 0.5Mpa to 0.8Mpa (primary forging);
and a second stage: the movable pressing block 5 is completely extended out, the pressure of the movable pressing block 5 is 0.50.5MPa to 0.8MPa, and the stamping frequency is 300-;
and a third stage: the movable pressing block is completely extended out, the pressure of the movable pressing block 5 is 1MPa to 1.5MPa, and the stamping frequency is 280-.
Further, after S5 is completed, the rotating device drives the pressure expanding device 2 to rotate, and the steps S1, S2, S3, S4 and S5 are repeatedly performed. Through the secondary molding of the sleeve, the metal strength of the sleeve is improved, the toughness of the sleeve is improved, and secondary damage is avoided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a reducing roll extrusion formula swell-pressure tubular column which characterized in that includes:
the driving mechanism (1) is arranged at a casing wellhead, and the driving mechanism (1) comprises a hydraulic pump (8), a pressure cylinder (4), a rotating device and a vertical moving device;
the pipe expanding and pressing device (2) is mounted on the driving mechanism (1), the rotating device and the moving device can respectively drive the pipe expanding and pressing device (2) to rotate and vertically move, the pipe expanding and pressing device (2) comprises a pipe body (3), a pressure cylinder (4) arranged in the pipe body (3) and movable pressing blocks (5) arranged in a staggered mode, the pressure cylinder (4) is connected with a hydraulic pump (8) through an oil pipe (6), the hydraulic pump (8) can drive the movable pressing blocks (5) to horizontally move between a position where the movable pressing blocks extend out of the pipe body (3) and a position where the movable pressing blocks retract into the pipe body (3), and a pressure relief device (7) is arranged on the oil pipe (6);
body (3) are including outer tube portion (31) and interior tube portion (32), outer tube portion (31) are located in activity briquetting (5), interior tube portion (32) and be connected with corresponding activity briquetting (5) are located in oil pipe (6), be equipped with hydraulic pressure expand tube (9) between interior tube portion (32) and outer tube portion (31), hydraulic pressure expand tube (9) are connected with hydraulic pump (8), hydraulic pressure expand tube (9) can switch between the state of rising and the state of contracting, and when hydraulic pressure expand tube (9) were in the state of rising, hydraulic pressure expand tube (9) formed the elastic connection between outer tube portion (31) and interior tube portion (32).
2. The variable diameter rolled swaged swage string of claim 1, wherein: the movable pressing blocks (5) are arranged in a plurality and are distributed radially at intervals along the axis of the pipe body (3), and the movable pressing blocks (5) are made of high-temperature-resistant steel.
3. The variable diameter rolled swaged swage string of claim 2, wherein: the outer pipe part is provided with a plurality of through grooves (51), and the hydraulic structure of the movable pressing block (5) slides between a position extending out of the through grooves (51) and a position withdrawing from the through grooves (51) under the driving of the pressure cylinder (4) and the hydraulic pump (8).
4. The variable diameter rolled swaged swage string of claim 1, wherein: the cross section of the movable pressing block (5) is rectangular.
5. The variable diameter rolled swaged swage string of claim 1, wherein: the bottom of the sleeve is in a conical shape.
6. A use method of the reducing rolling type expansion pipe column is characterized by comprising the use method of the reducing rolling type expansion pipe column in any one of claims 1 to 5,
s1: fixing the driving mechanism (1) on a wellhead to be repaired;
s2: installing the expansion device (2) on the driving mechanism (1);
s3: the vertical moving device drives the expansion device (2) to extend into the wellhead to be repaired until the expansion device (2) is located at the position to be repaired, and the vertical moving mechanism stops;
s4, starting the hydraulic pump (8), switching the hydraulic expansion pipe (9) to an expansion state, and filling the gap between the outer pipe and the inner pipe;
s5: and (3) starting the pressurizing cylinder to drive the movable pressing block (5) to do reciprocating horizontal movement so as to repeatedly punch the sleeve.
7. The use method of the variable diameter rolled swaged tubular string of claim 6, wherein: and in the step S5, repeatedly punching through a movable pressing block (5) to heat the sleeve to 1000-1250 ℃.
8. The use method of the variable diameter rolled swaged tubular string of claim 6, wherein: the S5 includes:
the first stage is as follows: the extending part of the movable pressing block (5) accounts for one third of the length of the movable pressing block, and the pressure of the movable pressing block (5) is 0.5Mpa to 0.8 Mpa;
and a second stage: the movable pressing block (5) is completely extended out, the pressure of the movable pressing block (5) is 0.50.5MPa to 0.8MPa, and the stamping frequency is 300-;
and a third stage: the movable pressing block (5) is completely extended out, the pressure of the movable pressing block (5) is 1Mpa to 1.5Mpa, and the stamping frequency is 280-.
9. The use method of the variable diameter rolled swaged tubular string of claim 6, wherein: and after S5 is finished, the rotating device drives the pressure expanding device (2) to rotate, and the steps S1, S2, S3, S4 and S5 are repeatedly executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010587553.7A CN111636840B (en) | 2020-06-24 | 2020-06-24 | Reducing rolling type expansion pipe column and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010587553.7A CN111636840B (en) | 2020-06-24 | 2020-06-24 | Reducing rolling type expansion pipe column and using method thereof |
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| Publication Number | Publication Date |
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| CN111636840A CN111636840A (en) | 2020-09-08 |
| CN111636840B true CN111636840B (en) | 2022-06-03 |
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| CN116066001B (en) * | 2021-11-03 | 2024-04-26 | 中国石油天然气股份有限公司 | Hydraulic shaping method for sleeve-type well |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB790455A (en) * | 1956-03-26 | 1958-02-12 | Claude Laval Jr | Improvements in or relating to expander tools |
| CN1807830B (en) * | 2006-02-06 | 2011-07-06 | 李孝勇 | Hydraulic diameter-variable casing expansion method and apparatus therefor |
| CN201024946Y (en) * | 2007-02-02 | 2008-02-20 | 李孝勇 | A hydraulic diameter-varying bushing pressure expansion device |
| CN102269187A (en) * | 2011-06-20 | 2011-12-07 | 大庆新力科技开发有限公司 | Well-repairing sleeve-mending supercharger |
| CN106224677A (en) * | 2016-08-05 | 2016-12-14 | 洛阳双瑞特种装备有限公司 | A kind of anti-intrinsic pressure straight pipe pressure-balancing type expansion joint of post unstability |
| CN206468316U (en) * | 2017-02-09 | 2017-09-05 | 新疆华油油气工程有限公司 | Momentum impacts pipe-expanding device |
| CN108500156A (en) * | 2018-06-01 | 2018-09-07 | 金华市威科工贸有限公司 | A kind of portable electric hydraulic tube expander |
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