CN103629473B - Oil pipeline steals hole non-stop plugging device - Google Patents
Oil pipeline steals hole non-stop plugging device Download PDFInfo
- Publication number
- CN103629473B CN103629473B CN201310175618.7A CN201310175618A CN103629473B CN 103629473 B CN103629473 B CN 103629473B CN 201310175618 A CN201310175618 A CN 201310175618A CN 103629473 B CN103629473 B CN 103629473B
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- Prior art keywords
- axle
- closure
- hole
- leading screw
- oil pipeline
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a kind of oil pipeline steal hole non-stop plugging device, mainly by：Fixture, rubber closure plug, crossbeam, punch block, heel post, plug, magnet base, main cylinder, calibrate axle, indicator, back-up ring, locking nut, leading screw, axle rotating lever, leading screw feeding lever, bistrique, metal washer, closure axle, hydralic pressure gauge, relief valve, cover plate constitute.Magnet base is adsorbed on oil pipeline, heel post is fixed on magnet base, crossbeam by clamp pressing, be fixed on heel post upper end, leading screw is compressed through the locking nut on crossbeam calibrates axle or closure axle, the aperture in robber hole is surveyed by calibrating axle lower end bistrique, hole is stolen by blocking axle lower end plug, rubber closure plug closure；Slice off and compress plug with cover plate after short tube and weld closure.The plugging device is calibrated, blocked to stealing hole under the premise of oil pipeline on-line production with pressure, whole process sealing is simple in construction without crude oil leakage, using conveniently, safely, it is to avoid the economic loss that oil pipeline stopping transportation is brought.
Description
Technical field
The present invention relates to a kind of oil pipeline plugging device, it is more particularly to a kind of oil pipeline under on-line production state it is real
The oil pipeline for applying No leakage closure steals hole non-stop plugging device.
Background technology
Oil pipeline is the important means of oil transportation, and its safety is related to economic life line of the country.At present, criminal exists
On oil pipeline punching, mounting ball valve carry out stolen phenomenon it is commonplace, by ball valve can repeat constantly steal oil.
When being blocked for such robber hole on oil pipeline, because the pressure of pipeline Crude Oil is too big, so in construction, it is necessary to
It will could first be blocked after the crude oil shutdown in pipeline, pressure release, recover the time required for oil transportation from pipe plugging to pipeline
Long, such closure mode operating efficiency is low for long distance oil pipeline, constructs very inconvenient, and oil pipeline stops
It is defeated by the loss that enterprise causes huge.
The scheme in closure oil pipeline robber hole mainly has at present：On ball valve cap welding and in hole is stolen embedded timber wedge this two
The method of kind；Former approach is easily formed in protruding part to be corroded and unsightly, the chock meeting of pipeline is embedded in later approach
Stop that rotating wash bowl passes through in pipeline, both the above method need be implemented after pipeline shutdown, pressure release, and stopping transportation is made to oil play
It is huge into economic loss.
The content of the invention
In view of the deficiencies of the prior art, the present invention will provide a kind of oil delivering pipe road and steal hole non-stop plugging device, should
Oil pipeline is stolen hole non-stop plugging device and can blocked on the premise of oil pipeline on-line production to stealing hole, and in closure
Whole sealing is high, is not in the leakage of crude oil.
The technical solution adopted for the present invention to solve the technical problems is：
Oil pipeline steal hole non-stop plugging device it is main by：Fixture, rubber closure plug, crossbeam, punch block, heel post, plug, magnetic
Power seat, main cylinder, calibrate axle, indicator, back-up ring, locking nut, leading screw, axle rotating lever, leading screw feeding lever, bistrique, metal
Packing ring, closure axle, hydralic pressure gauge, relief valve, cover plate composition.
The magnet base uses the magnetic stand with strong absorption affinity, is used as the base of plugging device.Spanner on magnet base
Pull it is lower after can realize self-locking, magnet base adsorbed, be fixed on pipe surface；Spanner is unlocked to, turned back the magnetic of rear magnet base
Power, which disappears, to remove plugging device；The heel post is fixed on magnet base, and column upper end is fluted, and top is provided with folder
Tool；The fixture is arranged on the top of heel post, and fixture can be pulled to compress, unclamp crossbeam manually；Have in the middle of the crossbeam certainly
Through hole under above, crossbeam two ends are placed in the groove of two heel posts, fix crossbeam by fixture, are pressed on two sides
Column upper end；The tight nut upper end of locking is fixed on crossbeam, and lower end passes through crossbeam intermediate throughholes；The leading screw outer wall has spiral shell
Line, top is the polished rod for having through hole, and there is body cavity bottom, coaxial with locking nut, main cylinder during installation, by rotating through locking screw
Mother, leading screw bottom clasps, compresses and calibrate axle or closure axle；Leading screw feeding lever is arranged in the through hole on leading screw top, rotates silk
Thick stick feeding lever drives leading screw rotates feeding；The back-up ring is arranged on the bottom of leading screw, plays firm axle or the closure axle calibrated
Effect；The main cylinder is divided into fixed seal ring in epicoeloma, hypocoelom, epicoeloma body, hypocoelom Ligation in vitro have hydralic pressure gauge and
Relief valve, whole main cylinder is arranged on the ball valve that stolen leaves；The sealing ring is fixed on the chamber inner sidewall of main cylinder upper body, sealing
There is the linear bearing of vertical direction on circle inwall, sealing ring can hold closure axle tightly or calibrate axle；The relief valve is arranged on main cylinder
The bottom of outer wall, is connected with the hypocoelom of main cylinder；The hydralic pressure gauge is arranged on the bottom of main drum outer wall, connects with the hypocoelom of main cylinder
It is logical；The through hole of the groove for placing metal washer and installation axle rotating lever is arranged at described axle outer wall top of calibrating, and mill is installed in bottom
Head, calibrates axle upper end and is covered, compresses by the hypocoelom of leading screw during work, the lower end for calibrating axle enters main barrel chamber from main cylinder top
It is interior；The bistrique is that surface has the cone-shaped metal bistrique of knurling, installed in calibrating axle bottom；Put the closure axle outer wall upper end
The groove of metal washer is put, plug is installed in bottom, axle upper end is blocked during work and covered, compress by leading screw hypocoelom, closure axle
Lower end enters the intracavitary of main cylinder from the top of main cylinder；The plug lower end is installed by rubber closure plug；The punch block is to have long-armed set
Ring, punch block is enclosed on closure axle or calibrates the upper end that axle is stuck on axle and by metal washer；The indicator is by elongated straight steel
The stopper composition of bar and upper end, stopper is welded on steel bar upper end, indicator from punch block it is long-armed on through hole insertion, instruction calibrates axle
Or the amount of feeding of closure axle；The cover plate is two pieces has the steel plate for having semicircle orifice in identical radian measure and plate section with pipeline, places
In space between closure axle and plug and clamping plug, cover plate is welded on oil pipeline surface and compresses plug.
The invention has the advantages that：1st, when the present invention steals hole closure to underground oil pipeline, soil excavation area
Small, plugging device can be adsorbed steadily on oil pipeline, and the pressure for effectively overcoming oil in pipeline is convenient for closure；2、
There is sealing ring in the main cylinder of the present invention, good leak tightness can measure the aperture for stealing hole, and nothing under the conditions of with pressure when calibrating
The leakage of crude oil；3rd, there is sealing ring in main cylinder of the invention, good leak tightness during closure will on the premise of oil pipeline on-line production
Steal hole closure, and the leakage without crude oil；4th, the present invention is blocked after match and plug closure using rubber, then will steal hole with metal cover board
Capping, welding, good sealing effect；5th, it is of the invention it is simple in construction, be readily disassembled assembling transport, using safe and simple.
Brief description of the drawings
Fig. 1 is diagrammatic cross-section when oil pipeline of the present invention steals hole non-stop plugging device measurement robber hole aperture.
Fig. 2 is diagrammatic cross-section when inventing type oil pipeline steals hole non-stop plugging device closure robber hole.
Diagrammatic cross-section when Fig. 3 connects for the stifled sealing of oil pipeline of the present invention robber's hole non-stop plugging device capping plate is stifled
In figure：
1. fixture, 2. rubber closure plug, 3. crossbeams, 4. punch blocks, 5. heel posts, 6. plugs, 7. magnet bases, 8. ball valves, 9.
Short tube, 10. main cylinders, 11. calibrate axle, 12. indicators, 13. back-up rings, 14. locking nuts, 15. leading screws, 16. axle rotating levers,
17. leading screw feeds lever, 18. bistriques, 19. metal washers, 20. closure axles, 21. hydralic pressure gauges, 22. relief valves, 23 cover plates, 24.
Sealing ring
Embodiment
With reference to the drawings and specific embodiments, the present invention is further detailed explanation
Oil pipeline of the present invention steals hole non-stop plugging device, mainly by：It is main cylinder 10, closure axle 20, leading screw 15, crossbeam 3, edge-on
Post 5, fixing nut, back-up ring 13, metal washer 19, closure axle 20, calibrate axle 11, axle rotating lever 16, leading screw feeding lever 17,
Punch block 4, indicator 12, magnet base 7, fixture 1, locking nut 14, bistrique 18, plug 6, hydralic pressure gauge 21, relief valve 22, rubber envelope
2, cover plate 23, sealing ring 24 is blocked to constitute, it is characterised in that：The magnet base 7 is made using the magnetic stand with strong absorption affinity
For the base of plugging device, the spanner on magnet base 7 pull it is lower after can realize self-locking, magnet base 7 is adsorbed, be fixed on pipeline table
Face, the magnetic force that spanner is unlocked to, turned back rear magnetic power meter 7 disappears, and can remove plugging device；The heel post 5 is fixed on magnetic
On power seat 7, the upper end of heel post 5 is fluted, and top is provided with fixture 1；The fixture 1 is arranged on the top of heel post 5, fixture 1
It can pull to compress, unclamp crossbeam 3 manually；There is top-down through hole in the middle of the crossbeam 3, the two ends of crossbeam 3 are placed on two
In the groove of heel post 5, crossbeam 3 is fixed by fixture 1, two upper ends of heel post 5 are pressed on；The upper end of locking nut 14
It is fixed on crossbeam 3, lower end passes through the intermediate throughholes of crossbeam 3；The outer wall of leading screw 15 has screw thread, and top is the polished rod for having through hole,
There is body cavity bottom, coaxial with locking nut 14, main cylinder 10 during installation, by rotating through locking nut 14, the bottom of leading screw 15 button
Firmly, compress and calibrate axle 11 or closure axle 20；Leading screw feeding lever 17 is arranged in the through hole on the top of leading screw 15, rotational lead screw feeding
Lever 17 drives leading screw 15 to rotate feeding；The back-up ring 13 is arranged on the bottom of leading screw 15, plays to consolidate and calibrates axle 11 or closure
The effect of axle 20；10 points of the main cylinder is fixed seal ring 24, hypocoelom Ligation in vitro in epicoeloma, hypocoelom, epicoeloma body
There are hydralic pressure gauge 21 and relief valve 22, whole main cylinder 10 is arranged on the ball valve 8 left after stolen；The sealing ring 24 is fixed on master
On 10 upper body chamber inner sidewalls of cylinder, there is the linear bearing of vertical direction on the inwall of sealing ring 24；The relief valve 22 is arranged on main cylinder
The bottom of 10 outer walls, is connected with the hypocoelom of main cylinder 10；The hydralic pressure gauge 21 is arranged on the bottom of the main outer wall of cylinder 10, with main cylinder 10
Hypocoelom connection；The described outer wall top of axle 11 of calibrating has the groove and installation axle rotating lever 16 of placing metal washer 19 logical
Bistrique 18 is installed in hole, bottom, and the upper end of axle 11 is calibrated during work and covered, compress by the hypocoelom of leading screw 15, the lower end of axle 11 is calibrated
Enter the main intracavitary of cylinder 10 from the main top of cylinder 10；The bistrique 18 is that surface has the cone-shaped metal bistrique of knurling, installed in calibrating axle
11 bottoms；There is the groove for placing metal washer 19 the closure axle 20 outer wall upper end, and bottom installs plug 6, axle is blocked during work
20 upper ends are covered by the hypocoelom of leading screw 15, compressed, and the lower end for blocking axle 20 enters the intracavitary of main cylinder 10 from the top of main cylinder 10；Institute
State the lower end of plug 6 and rubber closure plug 2 is installed；The punch block 4 is has the long-armed collar, and punch block 4 is enclosed on closure axle 20 or calibrates axle 11
Upper end upper and that axle is stuck in by metal washer 19；The indicator 12 is made up of the stopper of elongated straight steel bar and upper end, gear
Head is welded on steel bar upper end, indicator 12 from punch block 4 it is long-armed on through hole insertion the amount of feeding calibrated axle 11, block axle 20 is entered
Line identifier；The cover plate 23 is two pieces has the steel plate for having semicircle orifice in identical radian measure and plate section with pipeline, is placed on closure axle
In space between 20 and plug 6 and can and tight plug 6, cover plate 23 is welded on oil pipeline surface and compresses plug 6.
The present invention operation principle and the course of work be：
Short tube 9 is welded on oil pipeline by criminal in stolen, and has ball valve 8 on short tube 9, then in ball
Perforating device is installed on valve 8 to be punched, by installing flexible pipe on ball valve 8 come long-term oil steathily after punching, this plugging device is main
Pin punches the behavior that valve carries out long-term stolen of installing on oil pipeline；
Because being all the drill bit using standard during stolen molecule drilling hole of oil stolen, in order to meet the robber hole of closure multiple aperture,
The rubber closure plug 2 is different according to bit diameter, the rubber closure plug 2 of pre-production multiple diameter.
During closure, by pipeline grave mound excavate, expose one piece of surface of pipeline, by plugging device on oil pipeline group
Dress, if pipeline on the ground if directly plugging device assembled on pipeline.
First, main cylinder 10 is arranged on ball valve 8 and closes relief valve 22；Locking nut 14 is arranged on crossbeam 3,
The heel post 5 for being provided with magnet base 7 is placed on oil pipeline, the distance of side two root posts 5 is adjusted, along oil pipeline direction
It is equidistant to be placed on the both sides for stealing hole so that heel post 5 is conllinear with ball valve 8, and the spanner of magnet base 7 is pulled down, magnet base 7 is adsorbed
On oil pipeline, so that heel post 5 is fixed；In the groove that crossbeam 3 is arranged on to edge-on 5 top, the position of crossbeam 3 is adjusted
Put and cause the upper locking nut 14 of crossbeam 3 to be located at the surface of main cylinder 10, pulling clamp 1 compresses crossbeam 3；Rotating threaded shaft feeds thick stick
Bar 17 makes leading screw 15 be screwed in by the solid upper end of locking nut 14, by the bistrique 18 of coated paint, punch block 4, is installed to and calibrates on axle 11,
Indicator 12 is installed on punch block 4, the bottom of axle 11 will be calibrated and be initially inserted into main cylinder 10, the top of axle 11 insertion leading screw 15 is calibrated
The cavity of lower end, calibrates the lower end of axle 11 and inserts in main cylinder 10, and now, sealing ring 24 is held tightly and calibrates axle 11, is so rotated further leading screw
Lever 17 is fed, makes to calibrate axle 11 and continues under the pressure of leading screw 15 to lower feeding；By the instruction of indicator 12, enter in bistrique 18
Enter ball valve 8 and open ball valve 8 when bistrique 18 does not push up the valve inside ball valve 8.Leading screw feeding lever 17 is rotated further to cause
Calibrate axle 11 to continue to lower feeding, now show that bistrique 18 is had been introduced into robber hole simultaneously until leading screw 15 can not be moved still further below
It is clamped.Rotary shaft rotating lever 16 so that calibrate axle 11 and rotated with rotary bistrique 18, by bistrique 18 with stealing hole contact portion paint
Grind off.Rotational lead screw feeding lever 17 causes leading screw 15 to move upwards, and just ball has been left in bistrique 18 by the instruction of indicator 12
Turn off ball valve 8 during the valve of valve 8.It is rotated further leading screw and feeds lever 17 so that leading screw 15 is continued up, until that can take out
Calibrate axle 11.Taking-up is calibrated after axle 11, and the cleaning oil pollution of bistrique 18 is clean, is painted and is ground with vernier caliper measurement bistrique 18
The diameter of a circle to be formed is removed, the aperture in hole is as stolen.
Measure and select corresponding rubber closure plug 2 to be installed on plug 6 behind robber hole aperture, by plug 6, punch block 4, indicate
Pin 12 is installed on closure axle 20, leading screw 15 is revolved after height closure axle 20 is inserted into main cylinder 10, now, sealing ring 24 is held tightly
Axle 20 is blocked, leading screw 15 is rotated down compression closure axle 20 and continued to lower feeding.By the instruction of indicator 12 in closure
Axle 20 enters ball valve 8 and rubber blocks before plug 2 does not push up the inner valve of ball valve 8 and opens ball valve 8, and leading screw 15 continues to enter downwards
Give, the press-in of rubber closure plug 2 is stolen in hole, now steal hole and stoppered by rubber closure plug 2.Open in pressure relief valve 22, main cylinder 10
Pressure is turned off after releasing, and observes the registration situation of change of hydralic pressure gauge 21：If the registration of pressure gauge 21 is equal to zero, illustrate to steal
Hole has been plugged；If the registration of pressure gauge 10 is larger and reaches manifold pressure, illustrates that stealing Kong Wei is plugged, repeat to operate above.
Leading screw 15 compress closure axle 20 cause rubber closure plug 2 stopper robber hole on the premise of, by short tube 9 from petroleum pipeline
Road weld is cut off, and the part of short tube more than 9 is all above carried, plug 6 is now spilt, and the cover plate 23 of two pieces of closure is stuck in stifled
The simultaneously axle of the upper end of clamping plug 6 in gap between first 6 and closure axle 20, is welded on cover plate 23 and tightly oil pipeline surface,
By plug 6 and rubber closure plug 2 be enclosed in it is following, to cover plate 23 carry out repair welding make welding more firm, finally by the dress on plugging device
Dismounting is put, whole closure process is completed.
Claims (6)
1. a kind of oil pipeline steals hole non-stop plugging device, it is characterised in that including：
Main cylinder, is divided into epicoeloma, hypocoelom, installed in the upper end of ball valve during work；
Sealing ring, is fixed on the chamber inner sidewall of main cylinder upper body, and can hold tightly to calibrate on axle or closure axle, sealing ring inwall has vertical side
To linear bearing；
Relief valve, installed in the bottom of main drum outer wall, is connected with the hypocoelom of main cylinder；
Hydralic pressure gauge, installed in the bottom of main drum outer wall, is connected with the hypocoelom of main cylinder；
Magnet base, using two magnetic stands, the both sides for stealing hole are equidistantly placed on along oil pipeline direction, are adsorbed in petroleum pipeline
On the surface in road；
Heel post, two heel posts are respectively mounted, are fixed on two magnet bases；
Fixture, installed in the top of heel post, fixture can be pulled to compress, unclamp crossbeam manually；
Crossbeam, across the upper end in two heel posts, by clamp pressing, fixation, crossbeam is dismountable；
There is screw thread on locking nut, inwall, locking nut is fixed on crossbeam, the surface of main cylinder is coaxially mounted at main cylinder；
Leading screw, outer wall has screw thread, and top is polished rod and has through hole, and there is body cavity bottom, and leading screw is by rotating into locking nut simultaneously
To lower feeding, gaging hole journal axle or closure axle are compressed；
Calibrate axle, outer wall is smooth and the stainless round steel of through hole is arranged at top, surveys when stealing bore dia installed in the underface of leading screw, top
The body cavity of leading screw lower end is inserted, bottom is inserted in the sealing ring of main cylinder, main cylinder is passed through under the promotion of leading screw to lower feeding；
Bistrique, is that surface has knurling and scribbles the cone-shaped metal bistrique of paint, and upper end is big end, and lower end is tip, and bistrique passes through
The axle on top is arranged on the bottom for calibrating axle；
Closure axle, the smooth stainless round steel of outer wall, installed in the underface of leading screw during closure, the body of top insertion leading screw lower end
The sealing ring of main cylinder is inserted in chamber, bottom, and main cylinder is passed through under the promotion of leading screw to lower feeding；
Plug, installed in the bottom of closure axle, plug is fixed by screws in the bottom of closure axle；
Rubber closure plug, installed in the lower end of plug；
Indicator, passes perpendicularly through punch block and on punch block, there is the scale for indicating bistrique and plug position in indicator；
Axle feeds lever, is arranged on through the through hole for calibrating axle upper end in the through hole calibrated above axle.
2. oil pipeline according to claim 1 steals hole non-stop plugging device, it is characterised in that：Edge-on top end has placement horizontal
The groove of beam.
3. oil pipeline according to claim 1 steals hole non-stop plugging device, it is characterised in that：Also include indicator, punch block
Installed in closure axle and the upper end for calibrating axle, punch block is kept off in closure axle by metal washer and calibrates axle upper end.
4. oil pipeline according to claim 1 steals hole non-stop plugging device, it is characterised in that：Also include metal washer, gold
Category packing ring is clamped in closure axle and the groove for calibrating axle upper end.
5. oil pipeline according to claim 1 steals hole non-stop plugging device, it is characterised in that：Also include back-up ring, back-up ring peace
Mounted in the bottom of leading screw, play a part of firm closure axle or calibrate axle.
6. oil pipeline according to claim 1 steals hole non-stop plugging device, it is characterised in that：Also include cover plate, cover plate is
There is identical radian measure steel plate with oil pipeline, cover plate upper section there are the semicircular indentations of clamping plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310175618.7A CN103629473B (en) | 2013-04-27 | 2013-04-27 | Oil pipeline steals hole non-stop plugging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310175618.7A CN103629473B (en) | 2013-04-27 | 2013-04-27 | Oil pipeline steals hole non-stop plugging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103629473A CN103629473A (en) | 2014-03-12 |
| CN103629473B true CN103629473B (en) | 2017-08-15 |
Family
ID=50210799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310175618.7A Expired - Fee Related CN103629473B (en) | 2013-04-27 | 2013-04-27 | Oil pipeline steals hole non-stop plugging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103629473B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295852B (en) * | 2014-10-13 | 2016-03-30 | 北京市燃气集团有限责任公司 | A kind of pipe fitting blockage mechanism and stemming method thereof |
| CN108019178B (en) * | 2017-11-23 | 2020-07-03 | 中国石油集团渤海钻探工程有限公司 | Construction method for plugging production pipe column under pressure in pipe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2061638U (en) * | 1989-12-31 | 1990-09-05 | 燕胜利 | Dredging sealing and stopping device for covering leaks in pipes |
| CN2134577Y (en) * | 1991-11-25 | 1993-05-26 | 中国石化总公司兰州炼油化工总厂 | Clamping apparatus for quick plug |
| CN2444104Y (en) * | 2000-11-08 | 2001-08-22 | 居焕兴 | Leaking stoppage device for loophole with press |
| US20130056104A1 (en) * | 2011-09-02 | 2013-03-07 | David J. Kriens, Jr. | Snap fitting for plumbing |
| CN203453710U (en) * | 2013-04-27 | 2014-02-26 | 青岛科技大学 | Pressurized plugging device for oil-stolen hole on petroleum pipeline |
-
2013
- 2013-04-27 CN CN201310175618.7A patent/CN103629473B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN103629473A (en) | 2014-03-12 |
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Granted publication date: 20170815 Termination date: 20190427 |