CN107313737A - Double glue core annular preventers - Google Patents
Double glue core annular preventers Download PDFInfo
- Publication number
- CN107313737A CN107313737A CN201710530548.0A CN201710530548A CN107313737A CN 107313737 A CN107313737 A CN 107313737A CN 201710530548 A CN201710530548 A CN 201710530548A CN 107313737 A CN107313737 A CN 107313737A
- Authority
- CN
- China
- Prior art keywords
- glue core
- shell body
- interior
- flange seat
- piston rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003292 glue Substances 0.000 title claims abstract description 164
- 238000007790 scraping Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 239000013536 elastomeric material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 210000000988 bone and bone Anatomy 0.000 claims 1
- 239000004744 fabric Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 210000000664 rectum Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Devices (AREA)
Abstract
A kind of pair of glue core annular preventer, it includes：Flange seat, lower cover, lower wear ring, lower outer glue core, lower interior glue core, lower piston head, lower mud scraping disc, lower bracing frame, lower support tube, lower piston rod, balance manifold, upper piston rod, upper support tube, upper support frame, upper piston head, upper end cover, upper mud scraping disc, upper press cover, upper wear ring, upper outer glue core, upper interior glue core, shell body, pressure release manifold, box cupling detector.Glue core and lower interior glue core use pressing block type structure in upper, external hydraulic system provides hydraulic oil and entered in the space between upper piston rod, lower piston rod and shell body, outer glue core and lower outer glue core in extruding, it is radially expanded it, and then glue core and lower interior glue core on preventer is held tubing string tightly, play a part of sealing tubing annulus, while causing string collar to be forced through with string collar detector.Present invention can be implemented in no killing well, not in the case of open flow, sealing wellhead pressure during with pressure lower tubular column.
Description
Technical field：
The present invention relates to oil field shaft mouth well-control equipment field, when being particularly exclusively used in the operations such as well workover, pressure break, water filling, fit
For the preventer of with pressure lower tubular column operating mode, more particularly to a kind of pair of glue core annular preventer.
Background technology：
Operating Pressure is implemented as a kind of new underground work technology in the case of can having oil-air pressure in pit shaft
The underground work such as well workover and well stimulation works, and well killing fluid kill-job need not be circulated in the course of work with pressure, without open flow overflow, contracting
Alleviated while short duty cycle to formation damage, protect oil well productivity, reduce secondary after workover rig service to oil well
Operating cost.
Existing operation device under pressure, when wellheadpressure plays lower tubular column, is embraced using the spherical glue core in annular preventer
Tubing string realizes sealing wellhead in tight well, and during with pressure lower tubular column, tubing coupling is forced through annular preventer glue core, causes glue core
Serious wear, operation a bite well is accomplished by changing a glue core, and the price of glue core is very expensive, especially carries out that high pressure is with pressure to repair
During well, glue core rapid wear adds the possibility of blowout generation, the safety of serious threat operating personnel.
The content of the invention：
Overcome that traditional endless preventer operating pressure is low, latus rectum is small and glue core mill for work it is an object of the invention to provide one kind
The drawbacks of damaging fast, realizes in no killing well, not in the case of open flow, double glue cores of sealing wellhead pressure are annular during with pressure lower tubular column
Preventer.
The technical solution adopted by the present invention is：Double glue core annular preventers, it include flange seat, lower cover, lower wear ring,
Lower outer glue core, lower interior glue core, lower piston head, lower mud scraping disc, lower bracing frame, lower support tube, lower piston rod, balance manifold, upper work
Stopper rod, upper support tube, upper support frame, upper piston head, upper end cover, upper mud scraping disc, upper press cover, upper wear ring, upper outer glue core, it is upper in
Glue core, shell body, pressure release manifold, box cupling detector.Glue core, upper outer glue core are symmetrically installed with lower interior glue core and lower outer glue core in upper
In shell body.Wear ring is installed by screw between glue core and upper end cover in upper, spiral shell is passed through between lower interior glue core and flange seat
Nail installs wear ring.Upper support tube is symmetrically arranged in shell body with lower support tube by bolt.In upper mud scraping disc is installed on
Between glue core and upper support tube, lower mud scraping disc is installed between lower interior glue core and lower support tube.Upper piston head leads to upper piston rod
Cross mode connects for screw and be installed on outer glue core bottom, lower piston head is connected by screw with lower piston rod and is installed on lower outer glue core
Portion.Upper support frame is installed between upper end cover and shell body.Upper press cover is linked together upper end cover with shell body by bolt.
Lower bracing frame is installed between flange seat and shell body.Lower cover is linked together flange seat with shell body by bolt.Outside
Housing central section installs balance manifold, pressure release manifold and box cupling detector.
Described flange seat is annular, and cylindrical size and supporting wellhead flange are in the same size, annular flange seat week
To uniform 24 bolts hole, annular flange seat lower surface opens steel ring slot, to install octagonal ring steel ring, flange seat outer surface with
" O " shape sealing ring is installed between shell body, sealing is realized.
The flange seat flange seat is circumferentially uniformly distributed 24 bolts hole of Φ 47.
Shoulder hole is used inside described shell body, is easy to other parts fixed and positioned.
Circumferentially uniform four flange seats of described shell body, to install balance manifold, pressure release manifold and box cupling detector.
Described upper interior glue core and lower interior glue core use pressing block type structure, and upper interior glue core is close as lower interior glue core size
Skeleton radial motion can be ensured during envelope, while reducing glue core inner stress concentration.
Described upper outer glue core and lower outer glue core bottom use pyramidal structure, are easy in seal process interior glue in extruding
Core and lower interior glue core.
Described upper mud scraping disc and lower mud scraping disc use elastomeric material, can remove column surface greasy dirt, mitigate to pipe
The damage of post.
Described box cupling detector is installed on shell body flange seat by bolt, is coordinated in lower tubular column operation process is played
Balance manifold and pressure release manifold realize that tubing coupling is not forced through annular preventer glue core, reduce and glue core is damaged.
The beneficial effects of the invention are as follows：By external hydraulic system provide hydraulic oil enter upper piston rod, lower piston rod and
In space between shell body, outer glue core and lower outer glue core are radially expanded in extruding, and then glue core and lower interior in making on preventer
Glue core holds tubing string tightly, plays a part of sealing tubing annulus.The present invention not only has the function of traditional endless preventer, but also
The characteristics of having uniqueness.One of feature is, when interior glue core and lower interior glue core hold tubing string rountrip tightly on preventer, by string collar
Detector, which coordinates, causes string collar to be forced through, and mitigates the damage to upper interior glue core and lower interior glue core；The two of feature are,
Glue core and lower interior glue core use pressing block type structure in upper, and upper interior glue core and lower interior glue core reduce stress collection in seal process
In.
It is of the invention compared with existing technology have work latus rectum is big, seal pressure is high, can Operating Pressure rise lower tubular column, make
Wide, glue core long lifespan, good sealing effect with scope.Double glue core annular preventer glue cores use wear-resisting and high intensity elastic material
Material, can effectively increase the service life.
Brief description of the drawings：
Fig. 1：The main sectional view of double glue core annular preventers of the invention
Fig. 2：The left sectional view of double glue core annular preventers of the invention
Fig. 3：Glue cored structure schematic diagram in Fig. 1
Fig. 4：Glue core single-unit skeleton structure schematic diagram in Fig. 3
Fig. 5：Fig. 1 China and foreign countries glue cored structure schematic diagram
Fig. 6：Box cupling detector structural representation in Fig. 2
Symbol description：
1st, flange seat, 2, lower cover, 3, lower wear ring, 4, lower outer glue core, 5, lower interior glue core, 6, lower piston head, 7, under scrape
Mud pan, 8, lower bracing frame, 9, lower support tube, 10, lower piston rod, 11, balance manifold, 12, upper piston rod, 13, upper support tube,
14th, upper support frame, 15, upper piston head, 16, upper end cover, 17, upper mud scraping disc, 18, upper press cover, 19, upper wear ring, 20, upper outer glue
Core, 21, upper interior glue core, 22, shell body, 23, pressure release manifold, 24, box cupling detector, 25, interior glue core crab, 26, elastomeric material
Embodiment：
The invention will be further described with example below in conjunction with the accompanying drawings：
Embodiment 1
As shown in the main sectional view of Fig. 1 apparatus of the present invention, including flange seat (1), lower cover (2), lower wear ring (3),
Lower outer glue core (4), lower interior glue core (5), lower piston head (6), lower mud scraping disc (7), lower bracing frame (8), lower support tube (9), lower work
Stopper rod (10), balance manifold (11), upper piston rod (12), upper support tube (13), upper support frame (14), upper piston head (15), on
End cap (16), upper mud scraping disc (17), upper press cover (18), upper wear ring (19), upper outer glue core (20), upper interior glue core (21), shell
Body (22), pressure release manifold (23), box cupling detector (24).Glue core (21) in upper, upper outer glue core (20) and lower interior glue core (5) and under
Outer glue core (4) is symmetrically arranged in shell body (22), is installed between upper interior glue core (21) and upper end cover (18) by screw resistance to
Bull ring (19), lower wear ring (3), upper support tube (13) and lower branch are installed between lower interior glue core (5) and flange seat (1) by screw
Support cylinder (9) is symmetrically arranged in shell body (22) by bolt, and shell body (22) and upper support tube (13), lower support tube (9) connect
Contacting surface uses staged, is easily installed and positions, upper mud scraping disc (17) be installed on interior glue core (21) and upper support tube (13) it
Between, lower mud scraping disc (7) is installed between lower interior glue core (5) and lower support tube (9), and upper piston head (15) leads to upper piston rod (12)
Cross mode connects for screw and be installed on outer glue core (20) bottom, upper outer glue core (20) is by upper piston rod (12) in the presence of hydraulic oil
The lower interior glue core (21) of extruding realizes sealing, and lower piston head (6) is connected by screw with lower piston rod (10) and is installed on lower outer glue
Core (4) top, interior glue core (5) the realization sealing under being extruded by lower piston rod (10) in the presence of hydraulic coupling of lower outer glue core (4),
Upper support frame (14) is installed between upper end cover (16) and shell body (22), and shell body is designed with shoulder hole on (22), be easy on
Support frame (14) is positioned, and upper press cover (18) is linked together upper end cover (16) with shell body (22) by bolt, lower bracing frame
(8) it is installed between flange seat (1) and shell body (22), shell body is designed with shoulder hole on (22), is easy to lower bracing frame (8) fixed
Position, lower cover (2) is linked together flange seat (1) with shell body (22) by bolt.
Embodiment 2
Box cupling detector (24) described in above-described embodiment is installed as shown in Fig. 2 installing balance in the middle part of shell body (22)
Manifold (11), pressure release manifold (23) and box cupling detector (24), box cupling detector (24) are connected by bolt with shell body (22).
Embodiment 3
Upper interior glue core (21) and lower interior glue core (5) structure described in embodiment 1 as shown in figure 3, upper interior glue core (21) and
Glue core (5) uses pressing block type structure in lower, and interior glue core crab (25) sulfides with elastomeric material (26), upper interior glue core (21)
In lower interior glue core (5) seal process, briquetting is slided on step surface, and earrings is slided in adjacent ear groove, it is ensured that rubber will not
Extrude vertically.
Embodiment 4
Interior glue core crab (25) structure described in embodiment 3 is designed with as shown in figure 4, be designed with shoulder hole on skeleton
Earrings and ear groove, it is ensured that motion process it is concentric.
Embodiment 5
Upper outer glue core (20) and lower outer glue core (4) structure described in embodiment 1 as shown in figure 5, upper outer glue core (20) and
Lower outer glue core (4) bottom uses pyramidal structure, is easy in seal process interior glue core (21) and lower interior glue core (5) in extruding.
Embodiment 6
Box cupling detector (24) structure described in embodiment 2 is as shown in fig. 6, box cupling detector (24) and shell body (22)
It is bolted, using separate structure, is easily installed and changes.
Flange seat (1) is connected by bolt with ram preventer when using, and upper end cover (16) is detected by bolt and box cupling
Instrument (24) is connected, during raising oil pipe, and interior glue core (21) is closed on annular preventer, is realized with oil pipe external diameter dynamic close
Glue core (5) is in opening under envelope, annular preventer, now balances manifold (11) and is in full-shut position, works as tubing coupling
When touching box cupling detector (24) inside preventer, interior glue core (5) is closed rapidly under annular preventer, while pressure release manifold
(23) opening makes glue on the rapid pressure release of highly pressurised liquid between interior glue core (21) and lower interior glue core (5), annular preventer
, can be with smooth opening after core (21) pressure at both sides is balanced.When tubing coupling passes through interior glue core (21) on annular preventer
Interior glue core (21) is closed rapidly when touching collar detector (24), on annular preventer balances manifold (11) unlatching simultaneously, on
Highly pressurised liquid is full of between interior glue core (21) and lower interior glue core (5), now can be with interior glue core (5) under smooth opening annular preventer
Balance manifold (11) simultaneously to close, so as to complete the raising of an oil pipe.Next oil pipe lifting repeats the above steps, so that it may will
The raising out of well of every tubing safety comes out, and lower drain line is identical with raising oil pipe operation principle, and sequence of movement is opposite.
The present invention not only have traditional endless preventer function, and it is also original the characteristics of.First, on preventer
When glue core (21) and lower interior glue core (5) hold oil pipe tripping operation tightly, tubing coupling detector (24) coordinates so that tubing coupling without
It need to be forced through, mitigate the damage to upper interior glue core (21) and lower interior glue core (5)；Second, upper interior glue core (21) and lower interior glue core
(5) pressing block type structure is used, upper interior glue core (21) and lower interior glue core (5) reduce stress concentration in seal process.
It is of the invention compared with existing technology have work latus rectum is big, seal pressure is high, can with pressure lower tubular column operation, make
Wide with scope, on-line pressure sealant effect is good.Double glue core annular preventer glue cores use wear-resisting and high intensity elastomeric material, can be effective
Increase the service life and reduce the generation of gas blowout accident.
The present invention is described by way of example above, but the invention is not restricted to above-mentioned specific embodiment, it is all to be based on
Any change or modification that the present invention is done belong to the scope of protection of present invention.
Claims (9)
1. pair glue core annular preventer, it is characterised in that including flange seat (1), lower cover (2), lower wear ring (3), lower outer glue
Core (4), lower interior glue core (5), lower piston head (6), lower mud scraping disc (7), lower bracing frame (8), lower support tube (9), lower piston rod
(10), balance manifold (11), upper piston rod (12), upper support tube (13), upper support frame (14), upper piston head (15), upper end cover
(16), upper mud scraping disc (17), upper press cover (18), upper wear ring (19), upper outer glue core (20), upper interior glue core (21), shell body
(22), pressure release manifold (23), box cupling detector (24), upper interior glue core (21), upper outer glue core (20) and lower interior glue core (5) and it is lower outside
Glue core (4) is symmetrically arranged in shell body (22), is installed between upper interior glue core (21) and upper end cover (18) by screw wear-resisting
Ring (19), lower wear ring (3), upper support tube (13) and lower support are installed between lower interior glue core (5) and flange seat (1) by screw
Cylinder (9) is symmetrically arranged in shell body (22) by bolt, shell body (22) and upper support tube (13), lower support tube (9) contact
Face uses staged, is easily installed and positions, and upper mud scraping disc (17) is installed between interior glue core (21) and upper support tube (13),
Lower mud scraping disc (7) is installed between lower interior glue core (5) and lower support tube (9), and upper piston head (15) passes through with upper piston rod (12)
Mode connects for screw is installed on outer glue core (20) bottom, and upper outer glue core (20) is squeezed by upper piston rod (12) in the presence of hydraulic oil
Glue core (21) realizes sealing in pressure, and lower piston head (6) is connected by screw with lower piston rod (10) and is installed on lower outer glue core
(4) top, interior glue core (5) the realization sealing under being extruded by lower piston rod (10) in the presence of hydraulic oil of lower outer glue core (4), on
Support frame (14) is installed between upper end cover (16) and shell body (22), and shell body opens shoulder hole on (22), is easy to upper support frame
(14) position, upper press cover (18) is linked together upper end cover (16) with shell body (22) by bolt, lower bracing frame (8) is installed
Between flange seat (1) and shell body (22), shell body opens shoulder hole on (22), is easy to lower bracing frame (8) to position, lower cover
(2) flange seat (1) is linked together with shell body (22) by bolt.
2. according to claim 1 pair of glue core annular preventer, it is characterised in that：Described flange seat (1) is annular, outside
Circular diameter is consistent with supporting wellhead flange diameter, the circumferential uniform bolt hole of annular flange seat (1), annular flange seat (1)
Lower surface is provided with ring gasket groove, to install octagonal ring gasket, O shapes is installed between flange seat outer surface and shell body close
Seal, sealing medium.
3. according to claim 1 pair of glue core annular preventer, it is characterised in that：Circumferential uniform point of the flange seat (1)
24 bolts hole of Φ 47 of cloth.
4. according to claim 1 pair of glue core annular preventer, it is characterised in that：Used inside described shell body (22)
Shoulder hole, is easy to other parts fixed and positioned.
5. according to claim 1 pair of glue core annular preventer, it is characterised in that：Described shell body (22) is circumferential uniform
Four flange seats, to install balance manifold (11), pressure release manifold (23) and box cupling detector (24), flange seat is designed with steel
Ring recess, to install octagonal ring gasket.
6. according to claim 1 pair of glue core annular preventer, it is characterised in that：Described upper interior glue core (21) and lower interior
Glue core (5) uses pressing block type structure, and upper interior glue core (21) can ensure bone as lower interior glue core (5) size in seal process
Frame radial motion, while reducing glue core inner stress concentration.
7. according to claim 1 pair of glue core annular preventer, it is characterised in that：Described upper outer glue core (20) and lower outer
Glue core (4) bottom uses pyramidal structure, is easy in seal process interior glue core (21) and lower interior glue core (5) in extruding.
8. according to claim 1 pair of glue core annular preventer, it is characterised in that：Described upper mud scraping disc (17) and under scrape
Mud pan (7) uses elastomeric material, can remove column surface greasy dirt, mitigates the damage to tubing string.
9. according to claim 1 pair of glue core annular preventer, it is characterised in that：Described box cupling detector (24) passes through
Bolt is installed on shell body flange seat, and complex equilibrium manifold (11) and pressure release manifold (23) are real in lower tubular column operation process is played
Existing tubing coupling is not forced through annular preventer glue core, reduces and glue core is damaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710530548.0A CN107313737B (en) | 2017-06-30 | 2017-06-30 | Double glue core annular preventers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710530548.0A CN107313737B (en) | 2017-06-30 | 2017-06-30 | Double glue core annular preventers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107313737A true CN107313737A (en) | 2017-11-03 |
| CN107313737B CN107313737B (en) | 2019-04-26 |
Family
ID=60180998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710530548.0A Active CN107313737B (en) | 2017-06-30 | 2017-06-30 | Double glue core annular preventers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107313737B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821436A (en) * | 2019-11-19 | 2020-02-21 | 瑞安市浙工大创新创业研究院 | Blowout preventer for oil exploitation |
| CN110821439A (en) * | 2017-12-01 | 2020-02-21 | 王鲁洋 | Coiled tubing dynamic seal device |
| CN112483036A (en) * | 2020-12-14 | 2021-03-12 | 盐城市大冈石油工具厂有限责任公司 | Barrier-free circulating operation blowout preventer |
| CN112647888A (en) * | 2021-03-12 | 2021-04-13 | 东营政阳自动化科技有限公司 | Combined annular blowout preventer for petroleum drilling |
| CN115898319A (en) * | 2023-02-24 | 2023-04-04 | 四川新为橡塑有限公司 | Compound annular preventer of two rubber cores |
| CN116335575A (en) * | 2023-05-23 | 2023-06-27 | 东营孚瑞特能源设备有限公司 | Auxiliary device for petroleum well repairing operation |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821439A (en) * | 2017-12-01 | 2020-02-21 | 王鲁洋 | Coiled tubing dynamic seal device |
| CN110821439B (en) * | 2017-12-01 | 2021-10-08 | 山东精工密封技术有限公司 | Coiled tubing dynamic seal device |
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| CN110821436B (en) * | 2019-11-19 | 2021-11-02 | 瑞安市浙工大创新创业研究院 | Blowout preventer for oil exploitation |
| CN112483036A (en) * | 2020-12-14 | 2021-03-12 | 盐城市大冈石油工具厂有限责任公司 | Barrier-free circulating operation blowout preventer |
| CN112483036B (en) * | 2020-12-14 | 2021-10-01 | 盐城市大冈石油工具厂有限责任公司 | Barrier-free circulating operation blowout preventer |
| CN112647888A (en) * | 2021-03-12 | 2021-04-13 | 东营政阳自动化科技有限公司 | Combined annular blowout preventer for petroleum drilling |
| CN112647888B (en) * | 2021-03-12 | 2021-08-06 | 东营政阳自动化科技有限公司 | Combined annular blowout preventer for petroleum drilling |
| CN115898319A (en) * | 2023-02-24 | 2023-04-04 | 四川新为橡塑有限公司 | Compound annular preventer of two rubber cores |
| CN116335575A (en) * | 2023-05-23 | 2023-06-27 | 东营孚瑞特能源设备有限公司 | Auxiliary device for petroleum well repairing operation |
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| Publication number | Publication date |
|---|---|
| CN107313737B (en) | 2019-04-26 |
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