CN105840125A - Controllable reverse circulation structure - Google Patents
Controllable reverse circulation structure Download PDFInfo
- Publication number
- CN105840125A CN105840125A CN201610411318.8A CN201610411318A CN105840125A CN 105840125 A CN105840125 A CN 105840125A CN 201610411318 A CN201610411318 A CN 201610411318A CN 105840125 A CN105840125 A CN 105840125A
- Authority
- CN
- China
- Prior art keywords
- valve seat
- reacting cycle
- seal
- sliding sleeve
- cycle structure
- 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
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004576 sand 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Marine Sciences & Fisheries (AREA)
- Soft Magnetic Materials (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a controllable reverse circulation structure, which comprises an upper joint, a shear pin, a steel ball, a sliding sleeve, a valve seat, an inner barrel, a filter element, an upper channel, an outer barrel and a lower channel, wherein the upper part of the upper joint is provided with a joint buckle for connecting an upper drill pipe, and a water hole channel is formed in the middle of the upper joint so that drilling fluid and the steel ball pass through the water hole channel; external threads and internal threads are respectively arranged at the inside and outside of the lower part of the upper joint, and the external threads are in screw-thread fit connection with the upper end of the outer barrel; the internal threads are in fit connection with the sliding sleeve, and the upper part of the valve seat is in sliding seal with the sliding sleeve; the outline structure of the interior space of the valve seat is a conical surface matched with the steel ball, and the lower part of the valve seat and the outer barrel form a seal; the shear pin is respectively connected with the sliding sleeve and the valve seat, and the shear pin is broken by downward pressure when the downward pressure of the upper part of the valve seat reaches the threshold valve pressure; the upper part of an inner sleeve is in seal connection with the valve seat, and the lower part of the inner sleeve and the inner wall of the outer barrel are welded together to form a whole; the filter element is detachably and fixedly connected with the inner barrel.
Description
Technical field
The present invention relates to oil and gas exploitation have an accident fishing time use some reverse-circulating tools, especially
Relate to the controlled reacting cycle structure of a kind of improvement of reverse-circulating tool.
Background technology
Along with energy demand constantly increases, petroleum resources is more and more deficienter, and development difficulty the most constantly increases, thing
Therefore rate consequently also increases, wherein about bottom hole falling article salvage operation it occur frequently that, as with bore salvage, milling salvage,
Reacting cycle salvaging etc..The development of reacting cycle fishing process has driven progress and the development of workover tool.Due to reacting cycle
The progress of fishing process, the requirement to reacting cycle class instrument is more and more stricter, it is desirable to instrument functional,
Usability, security, applicability etc. develop with fishing process technology.The most a lot of anti-
Circulation fishing tool reacting cycle structure there are some problems always, it is impossible to meet suitable water horizontal well fishing process,
There is also some problems in reliability.Such as, when tradition reacting cycle fishing tool performs salvaging task in straight well,
Before putting into steel ball, some drilling fluid is limited by the passage of reacting cycle mechanism, side leakage phenomenon occurs, to making shaft bottom thin
Sand cannot be rinsed completely, and when salvaging in horizontal well, after putting into steel ball, steel ball is affected by gravity cannot be correct
Enter horn mouth and form fitted seal with valve seat, and cause instrument cannot realize the reacting cycle function of shaft bottom drilling fluid.
The reacting cycle structure of tradition reverse-circulating tool is mainly by top connection 1, urceolus 2, cup 3, cup 5, inner core
6, upper channel 7, lower channel 8, steel ball 4 form (referring to Fig. 1).Its working method is: put into phase from well head
Answering the steel ball 4 of specification, steel ball 4 enters cup 3 under drilling fluid and Action of Gravity Field and blocks passage, forces drilling fluid
Annular space from lower channel 8 entering tool, then enter inner core 6 from tool bottom, finally from upper channel 7 drains into
Annular space, until well head, so realizes the shaft bottom reacting cycle of drilling fluid.
For this reacting cycle structure, in horizontal well, instrument entirety lays flat on one's back, and during not pitching, drilling fluid is from interior
Passage 8 leakage under cylinder 6 and urceolus 2 annular space cause drilling fluid cannot desilting at the bottom of flushing manhole or tiny mince completely,
Be easily caused cleaning not thoroughly, weight then there will be lock of tool drilling；After pitching, steel ball 4 can be affected by gravity and fall into into interior
Formation plugging effect in cup 3 cannot be entered correctly in cylinder 6 and urceolus 2 annular space, cause reacting cycle disabler.
In order to be able to meet being actually needed of oil field production development, the reliability of well reacting cycle fishing process of improving the standard,
There must be a kind of new construction that tradition reacting cycle structure can be overcome to be similar to shortcoming.Therefore actual need are produced according to oil field
Want, a kind of simple in construction of invention, easy to maintenance, safe and reliable, in horizontal well on reverse-circulating tool can be used for
Plant controlled reacting cycle structure, limitation and the uncontrollability of tradition reacting cycle structure can be solved.This reacting cycle structure
Be possible not only to the junk basket with reverse circulation before substituting, reacting cycle strong magnetic junk basket, reacting cycle are tackled all problems at once, reacting cycle is broken
In the instrument of many old-fashioned reacting cycle structures such as thing fisher and can also realize normal when not negating circulation
Circulation of drilling fluid (i.e. direct circulation) this structure has ten to the development of reverse-circulating tool and reacting cycle fishing process
Divide important meaning.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of controlled counter follow
Ring structure, with an improved the reacting cycle mechanism in existing old-fashioned reverse-circulating tool, it is possible to meet horizontal well, straight well
The reliability applied Deng reacting cycle in Holes of Complicated Wells and Controllability, it is possible to use this reacting cycle structure to reach counter and follow
Ring purpose, and the direct circulation of drilling fluid can be kept when not in use.
For achieving the above object, the invention provides a kind of controlled reacting cycle structure for reverse-circulating tool, it is special
Levy and be to include: top connection, shear pin, steel ball, sliding sleeve, valve seat, inner core, filter core, upper channel, urceolus and under
Passage；Wherein, the top of top connection is configured with the joint buckle for connecting top rod, formation in the middle of top connection
Hydrophthalmia passage is so that drilling fluid and steel ball pass through；External screw thread and internal thread it is respectively equipped with, outward inside and outside the bottom of top connection
Screw thread is connected with the threaded upper ends of urceolus, and internal thread is connected with sliding sleeve；Valve seat top is slided close with sliding sleeve
Envelope, the profile inner space structure of valve seat is the conical surface coordinated with steel ball, and the bottom of valve seat is formed with urceolus and seals；
Wherein, shear pin is connected with sliding sleeve and valve seat respectively, wherein when the downward pressure on valve seat top reaches threshold pressure,
Described downward pressure makes shear pin rupture；Inner sleeve top is connected with valve base sealing, and inner sleeve bottom is welded with outer tube inner wall
It is connected together to form entirety；Filter core is removably secured with inner core and is connected.
Preferably, described controlled reacting cycle structure also includes bottom fisher, and wherein urceolus bottom and bottom
Fisher is removably secured connection.
Preferably, bottom fisher be strong magnetic, drag for basket, tackle all problems at once, combine in fisher one or more.
Preferably, filter core outer wall is uniformly distributed multiple filter bores, is used for filtering landwaste or junk and not affecting drilling fluid
Normal circulation.
Preferably, seal it is provided with between internal thread and the sliding sleeve of top connection to form sealing.
Preferably, seal it is provided with between external screw thread and the urceolus of top connection to form sealing.
Preferably, valve seat upper periphery be provided with seal in case with sliding sleeve slipper seal.
Preferably, seal it is provided with between bottom and the urceolus of valve seat to form sealing.
Preferably, it is in the circumferential directions of inner sleeve to have for connecting the single of inner core and urceolus in upper channel position
Or multiple bracers.
Preferably, inner sleeve top is tightly connected by seal with valve seat.
Below with reference to accompanying drawing, the technique effect of design, concrete structure and the generation of the present invention is described further,
To be fully understood from the purpose of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the reacting cycle structure of tradition reverse-circulating tool.
Fig. 2 is the reacting cycle structure of reverse-circulating tool according to the preferred embodiment of the invention.
It should be noted that accompanying drawing is used for illustrating the present invention, and the unrestricted present invention.Note, represent the attached of structure
Figure may be not necessarily drawn to scale.Further, in accompanying drawing, same or like element indicates same or like
Label.
Detailed description of the invention
Fig. 2 is the reacting cycle structure of reverse-circulating tool according to the preferred embodiment of the invention.
Specifically, as shown in fig. 2, the reacting cycle structure of reverse-circulating tool includes according to the preferred embodiment of the invention:
Top connection 10, shear pin 20, steel ball 30, sliding sleeve 40, valve seat 50, inner core 60, filter core 70, upper channel 80,
Urceolus 90, lower channel 100 and bottom fisher 110.
Wherein, the top of top connection 10 is configured with the joint buckle (modular connection button) for connecting top rod, on
Hydrophthalmia passage is formed so that drilling fluid and steel ball 30 pass through in the middle of joint 10；Inside and outside point of the bottom of top connection 10
Not being provided with external screw thread and internal thread, external screw thread is connected with the threaded upper ends of urceolus 90, internal thread and sliding sleeve 40
It is connected.
Preferably, such as, it is provided with seal between internal thread and the sliding sleeve 40 of top connection 10 to seal.Preferably
Ground, such as, is provided with seal between external screw thread and the urceolus 90 of top connection 10 and seals.
Wherein, valve seat 50 top and sliding sleeve 40 slipper seal, the profile inner space structure of valve seat 50 is and steel
The conical surface (thus, the conical surface and steel ball 30 can form sealing under drilling liquid pressure effect) that ball 30 coordinates, valve seat
The bottom of 50 is formed with urceolus 90 and seals.
Preferably, such as, valve seat 50 upper periphery be provided with seal in case with sliding sleeve 40 slipper seal.Preferably,
Such as, it is provided with seal to form sealing between bottom and the urceolus 90 of valve seat 50.
Wherein, shear pin 20 is connected with sliding sleeve 40 and valve seat 50 respectively, wherein when the downward pressure on valve seat 50 top
When power reaches threshold pressure, described downward pressure makes shear pin 20 rupture, the rear valve base and shear pin 20 ruptures
50 slide downward.
Wherein, inner sleeve 60 top is tightly connected with valve seat 50, and inner sleeve 60 bottom and urceolus 90 inwall are welded on one
Rise to form entirety.Wherein for example, it is possible to the circumferential directions being in inner sleeve 60 in upper channel 80 position has (example
As, it is welded with) for connecting single or multiple bracers of inner core 60 and urceolus 90.
Preferably, such as, inner sleeve 60 top is tightly connected by seal with valve seat 50.
Wherein, filter core 70 is removably secured with inner core 60 and is connected (such as, threaded), filter core 70 outer wall
It is uniformly distributed multiple fine filter hole, is used for filtering bigger landwaste or junk and not affecting drilling fluid and normally circulate.
Wherein, urceolus 90 bottom is removably secured with bottom fisher 110 and is connected (such as, threaded),
Different types of fisher 110 is may select according to different salvaging forms.
Wherein, bottom fisher 110 is supporting fishing tool according to concrete fishing process, such as: Qiang Ci, drag for
Basket, tackle all problems at once, combine fisher etc..
Before not putting into steel ball, drilling fluid leads directly to valve seat 50, flows to, in lower drilling tool, formed through filtration core 70
Whole direct circulation.After putting into steel ball 30, steel ball 30 accurately enters the conical surface of valve seat 50 under the drive of drilling fluid,
And forcing shear pin 20 to be torn along with the increase steel ball 30 of pressure promotes valve seat 50 to move down, valve seat 50 moves
In inner core 60 top, open the annulus access between hydrophthalmia passage and inner core 60 and urceolus 90, now drilling well
Liquid can flow to the outer annular space between instrument and the borehole wall from lower channel 100, then enters inner chamber from tool bottom, then passes through
Upper channel 80 counter go out the outer annular space of the borehole wall until well head, complete reacting cycle.
Instant invention overcomes the shortcoming that prior art is not enough, controllability increase i.e. exists compared with tradition reacting cycle structure
Can ensure the direct circulation of drilling fluid during not pitching, after pitching, energy reacting cycle completely, makes reverse-circulating tool obtain wider array of
Application, maximization plays economic serviceability and the reliability of this type of reverse-circulating tool.Solve tradition reacting cycle structural steel
There is packing less situation with ball seat in ball.This reacting cycle structure can be used in multiple reverse-circulating tool, such as reacting cycle
Junk basket, reacting cycle strong magnetic die, reacting cycle Multifunctional latch jack etc., this structure is for this type of reacting cycle work
The technology development of tool and use value have highly important meaning and economic benefit.
Described above illustrate and describes the preferred embodiments of the present invention, as previously mentioned, it should be understood that the present invention is not
It is confined to form disclosed herein, is not to be taken as the eliminating to other embodiments, and can be used for other groups various
Close, amendment and environment, and can be in invention contemplated scope described herein, by above-mentioned teaching or association area
Technology or knowledge are modified.And the change that those skilled in the art are carried out and change are without departing from the spirit of the present invention and model
Enclose, the most all should be in the protection domain of claims of the present invention.
Claims (10)
1. the controlled reacting cycle structure for reverse-circulating tool, it is characterised in that including: top connection, shear pin,
Steel ball, sliding sleeve, valve seat, inner core, filter core, upper channel, urceolus and lower channel；Wherein, top connection
Top is configured with the joint buckle for connecting top rod, forms hydrophthalmia passage to bore in the middle of top connection
Well liquid and steel ball pass through；Being respectively equipped with external screw thread and internal thread inside and outside the bottom of top connection, external screw thread is with outer
The threaded upper ends of cylinder is connected, and internal thread is connected with sliding sleeve；Valve seat top and sliding sleeve slipper seal,
The profile inner space structure of valve seat is the conical surface coordinated with steel ball, and bottom and the urceolus of valve seat are formed close
Envelope；Wherein, shear pin is connected with sliding sleeve and valve seat respectively, wherein reaches when the downward pressure on valve seat top
During threshold pressure, described downward pressure makes shear pin rupture；Inner sleeve top is connected with valve base sealing, interior
Set bottom welds together to form entirety with outer tube inner wall；Filter core is removably secured with inner core and is connected.
Controlled reacting cycle structure the most as claimed in claim 1, it is characterised in that also include bottom fisher, and
Wherein urceolus bottom is removably secured with bottom fisher and is connected.
Controlled reacting cycle structure the most as claimed in claim 2, it is characterised in that bottom fisher is strong magnetic, drags for
Basket, tackle all problems at once, combine in fisher one or more.
4. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that filter core outer wall is uniform
It is distributed multiple filter bores, is used for filtering landwaste or junk and not affecting drilling fluid and normally circulate.
5. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that the interior spiral shell of top connection
Seal it is provided with to form sealing between line and sliding sleeve.
6. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that the outer spiral shell of top connection
Seal it is provided with to form sealing between line and urceolus.
7. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that valve seat upper periphery
Be provided with seal so as with sliding sleeve slipper seal.
8. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that the bottom of valve seat with
Seal it is provided with to form sealing between urceolus.
9. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that in upper channel position
The circumferential directions being in inner sleeve has single or multiple the bracers for connecting inner core and urceolus.
10. the controlled reacting cycle structure as described in one of claims 1 to 3, it is characterised in that inner sleeve top and valve
Seat is tightly connected by seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610411318.8A CN105840125B (en) | 2016-06-13 | 2016-06-13 | A kind of controllable reacting cycle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610411318.8A CN105840125B (en) | 2016-06-13 | 2016-06-13 | A kind of controllable reacting cycle structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105840125A true CN105840125A (en) | 2016-08-10 |
| CN105840125B CN105840125B (en) | 2019-02-01 |
Family
ID=56575843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610411318.8A Active CN105840125B (en) | 2016-06-13 | 2016-06-13 | A kind of controllable reacting cycle structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105840125B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110290849A (en) * | 2017-02-13 | 2019-09-27 | 雅玛信过滤器株式会社 | Filter for installation and filter device |
| CN111305783A (en) * | 2019-11-18 | 2020-06-19 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fishing device and fishing method for underground junk |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB340292A (en) * | 1929-07-08 | 1931-01-08 | Doheny Stone Drill Co | Improvements in or relating to fishing tools for use in well drilling operations |
| CN2732984Y (en) * | 2004-09-17 | 2005-10-12 | 新疆石油管理局井下作业公司 | Multipurpose hydraulic junk basket |
| CN202081849U (en) * | 2011-06-15 | 2011-12-21 | 明柱平 | Fishing cup used for oil field well drilling and well repairing |
| CN103452514A (en) * | 2013-09-13 | 2013-12-18 | 中国海洋石油总公司 | Wide-range catch socket |
| CN105178902A (en) * | 2015-08-05 | 2015-12-23 | 中国石油天然气股份有限公司 | Lifting type fishing tool |
| US20160123116A1 (en) * | 2014-10-31 | 2016-05-05 | Spoked Solutions LLC | Systems and methods for managing debris in a well |
| CN205225135U (en) * | 2015-11-27 | 2016-05-11 | 中国石油天然气股份有限公司 | Extension separates anti - sucker rod centralizer that circulates of cavate and salvages a section of thick bamboo |
| CN205823206U (en) * | 2016-06-13 | 2016-12-21 | 新疆如通石油技术服务有限公司 | A kind of controlled reacting cycle structure |
-
2016
- 2016-06-13 CN CN201610411318.8A patent/CN105840125B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB340292A (en) * | 1929-07-08 | 1931-01-08 | Doheny Stone Drill Co | Improvements in or relating to fishing tools for use in well drilling operations |
| CN2732984Y (en) * | 2004-09-17 | 2005-10-12 | 新疆石油管理局井下作业公司 | Multipurpose hydraulic junk basket |
| CN202081849U (en) * | 2011-06-15 | 2011-12-21 | 明柱平 | Fishing cup used for oil field well drilling and well repairing |
| CN103452514A (en) * | 2013-09-13 | 2013-12-18 | 中国海洋石油总公司 | Wide-range catch socket |
| US20160123116A1 (en) * | 2014-10-31 | 2016-05-05 | Spoked Solutions LLC | Systems and methods for managing debris in a well |
| CN105178902A (en) * | 2015-08-05 | 2015-12-23 | 中国石油天然气股份有限公司 | Lifting type fishing tool |
| CN205225135U (en) * | 2015-11-27 | 2016-05-11 | 中国石油天然气股份有限公司 | Extension separates anti - sucker rod centralizer that circulates of cavate and salvages a section of thick bamboo |
| CN205823206U (en) * | 2016-06-13 | 2016-12-21 | 新疆如通石油技术服务有限公司 | A kind of controlled reacting cycle structure |
Non-Patent Citations (2)
| Title |
|---|
| 吴国云等: "《石油工程生产实习教程》", 31 July 2015, 石油工业出版社 * |
| 李长葆: "LLC型反循环打捞篮", 《石油矿场机械》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110290849A (en) * | 2017-02-13 | 2019-09-27 | 雅玛信过滤器株式会社 | Filter for installation and filter device |
| CN110290849B (en) * | 2017-02-13 | 2021-09-07 | 雅玛信过滤器株式会社 | Filter device and filter device |
| CN111305783A (en) * | 2019-11-18 | 2020-06-19 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fishing device and fishing method for underground junk |
| CN111305783B (en) * | 2019-11-18 | 2023-09-26 | 中国石油天然气集团有限公司 | Underground junk salvaging device and salvaging method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105840125B (en) | 2019-02-01 |
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