CN109779558A - A kind of oil field Special fishing tool and its application method - Google Patents
A kind of oil field Special fishing tool and its application method Download PDFInfo
- Publication number
- CN109779558A CN109779558A CN201711101317.4A CN201711101317A CN109779558A CN 109779558 A CN109779558 A CN 109779558A CN 201711101317 A CN201711101317 A CN 201711101317A CN 109779558 A CN109779558 A CN 109779558A
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- China
- Prior art keywords
- fishing
- drilling rod
- movable plate
- fishing socket
- cavity
- 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.)
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Abstract
A kind of oil field Special fishing tool and its application method, it is related to a kind of fishing device, drilling rod cavity is equipped on the inner cavity top of the fishing socket, supporting plate is equipped between two strut lower part, the supporting plate is divided into salvaging cavity for tube inner chamber lower part is salvaged, strong magnet is equipped on the supporting plate lower surface, clamping ring is equipped on the fishing socket top, the clamping ring is fixedly connected by two struts being pierced by fishing socket top with fishing socket, it is pierced by fishing socket upper part in two strut and is respectively sleeved on reset spring, right movable plate and left movable plate are respectively equipped in fishing socket lower part two sides；The present invention not only may make effectively avoids soil sundries in well from entering in salvaging tube inner chamber in advance when being oriented well and protruding into fishing, and metal pieces or other sundries in salvaging tube inner chamber is effectively avoided to fall in Hui Jing in extraction fishing socket outward, great convenience is provided to be oriented the fishing of well, greatly reduces the salvaging difficulty of staff.
Description
Technical field
The present invention relates to a kind of fishing devices, more particularly, to a kind of oil field Special fishing tool.
Background technique
Well known, directional well is deviateed centainly on a set direction with well head vertical line according to artificial needs
The well of distance, directional well technology are one of state-of-the-art drilling technologies of world today's oil exploration and development fields, it is by special
Downhole tool, measuring instrument and technology effectively control well track, bore drill bit up to the predetermined mesh in underground along specific direction
Target drilling technology.
It in oil-water well workover treatment, often will appear some sundries in pit shaft, generated for example, by using bridge plug fracturing technology
Irregular slips fragment cause the subsequent tool of going into the well to be hampered, can not pass through, shadow as the flushing of water flow is scattered in pit shaft
Construction has been rung, construction cost is increased, when especially salvaging in directional well, or has used common oil well fisher pair
The well metal pieces that fall in directional well carry out fishing, cause salvaging to fall because tripping in fishing string is flexible insufficient often
Sky, or even will appear lock of tool drilling, cause salvage to complicate, falls well metal pieces salvage to petroleum directional well and cause
Many troubles and workload cause metal pieces fishing construction cost high, time-consuming and laborious.
Disclosing a kind of directional well that Authorization Notice No. is CN202990927U in the prior art, dedicated to fall well metal pieces strong
Magnetic fishing device carries out absorption salvaging to metal pieces in well by strong magnet and locking jaw, although the device can be in drilling well
Metal pieces salvaged, be hatch frame due to salvaging tube inner chamber however during salvaging, this results in beating protruding into
During fishing, soil or other sundries in well, which can enter, salvages tube inner chamber, and strong magnet can be also covered when serious, causes magnetic suction
Attached power weakens；In addition, metal pieces can be hindered when not only protruding into salvaging since locking jaw can not be controlled during salvaging
Into salvaging tube inner chamber, and when extracting fishing socket, due to not fixing, sundries or metal pieces in salvaging tube inner chamber are also
It is to fall away, brings inconvenience to the fishing of directional well.
Summary of the invention
In order to overcome the shortcomings in the background art, the invention discloses a kind of oil field Special fishing tools, through the invention,
It not only may make and soil sundries in well effectively avoided to enter in salvaging tube inner chamber in advance when being oriented well and protruding into fishing,
And outward extraction fishing socket when effectively avoid salvage tube inner chamber in metal pieces or other sundries fall in Hui Jing, for into
The fishing of row directional well provides great convenience, greatly reduces the salvaging difficulty of staff.
Realize that technical scheme is as follows:
A kind of oil field Special fishing tool, including fishing socket are equipped with drilling rod cavity on the inner cavity top of the fishing socket, described
Fishing socket upper surface middle part is equipped with drilling rod insert port corresponding with the drilling rod cavity, in the brill for salvaging tube inner chamber top
Bar cavity is respectively equipped with perforation on two sidewalls, sets respectively in the perforation on the salvaging tube inner chamber top rod cavity two sidewalls
There is the strut with perforated interval cooperation, the strut upper end on drilling rod cavity two sidewalls is pierced by via perforation to fishing socket
Top, the strut lower end on drilling rod cavity two sidewalls are pierced by via perforation to tube inner chamber lower part is salvaged, in two strut
Supporting plate is equipped between lower part, the supporting plate is divided into salvaging cavity for tube inner chamber lower part is salvaged, sets on the supporting plate lower surface
There is strong magnet, is equipped with clamping ring on the fishing socket top, the clamping ring is pierced by by described to two of fishing socket top
Bar is fixedly connected with fishing socket, is pierced by fishing socket upper part in two strut and is respectively sleeved on reset spring,
The clamping ring is equipped with elastic opening, and the elastic opening two sides on the clamping ring are respectively equipped with limit plate, in the pine
Be respectively equipped with corresponding screw hole on the limit plate of tight opening two sides, be equipped on the limit plate of the elastic opening two sides across
The bolt of screw hole on two limit plates is equipped with nut in one end of the bolt, is respectively equipped with the right side in fishing socket lower part two sides
Movable plate and left movable plate, the right movable plate and left movable plate are V-shaped structure, and the right movable plate and left movable plate are logical
It crosses hinge and fishing socket lower part two sides to be articulated and connected, the inner wall of the right movable plate and left movable plate and be pierced by drilling rod cavity two
The strut lower end of lower sidewall is fixedly connected.
The corner of the oil field Special fishing tool, the right movable plate and left movable plate lower end is arc-shaped knot
Structure.
The oil field Special fishing tool is respectively equipped with several logical on the right movable plate and left movable plate side wall
Hole.
The application method of the oil field Special fishing tool, number is before being oriented well fishing, first by drilling rod
It is inserted into the drilling rod cavity in fishing socket via the drilling rod insert port on clamping ring and fishing socket top, so that drilling rod front end is just located
In the supporting plate top in fishing socket；After drilling rod insertion, the elastic opening on clamping ring is locked by bolt and nut, is made
Being connected on drilling rod for ring firm stable must be clamped；When being oriented well fishing, since directional well has certain well
Road, as protruding into for drilling rod drives fishing socket persistently to protrude into, due to the elastic spacing of reset spring during fishing socket protrudes into
Operation, so that strut can not press downwards, so that the right movable plate and left movable plate of fishing socket lower part two sides are constantly in
Closed state, the soil that can avoid in directional well carry out inside salvaging cavity in advance, and the sharp cone distal structure of front makes fishing socket
Protrude into it is more convenient；After fishing socket, which stretches to orientation bottom, to be continued to protrude into, since drilling rod continues to press downwards, bore
Bar can then push down on supporting plate, so that strut be pushed down on, after strut pushes down on, right movable plate is fixedly connected with strut
It can then be opened by strut with left movable plate, the metal pieces for orienting bottom can then be salvaged the strong of cavity inside supporting plate lower surface
Magnet carries out absorption salvaging；After salvaging, it is drawn upwardly out drilling rod, drilling rod can not press to supporting plate after moving up, supporting plate
And the strut of two sides is lifted up by the automatic elasticity of reset spring, so that the right activity being fixedly connected with two sides strut
Plate and left movable plate withdraw closure, with the closure of right movable plate and left movable plate, can by orient bottom metal pieces and
Sundries is salvaged into salvaging inside cavity, with the lasting rising of drilling rod, salvages the liquid mixture in cavity via right movable plate
With the through-hole outflow on left movable plate side wall；After drilling rod and fishing socket are fully drawn out directional well, fishing socket is salvaged in cavity 21
Metal pieces and sundries take out after can be salvaged again.
The invention has the advantages that a kind of oil field Special fishing tool of the present invention, it can by setting clamping ring
Convenient for the present apparatus is connected to drilling rod top；By the way that elastic opening, limit plate and bolt is arranged, elastic tune can be carried out to clamping ring
Section is clamped so that clamping ring is stable and firm with drilling rod；By setting reset spring and strut, can be made by reset spring
Guarantee that the movable plate of fishing socket lower part two sides be in closed state when not applying pressure to strut, effectively avoid protruding into dozen
Soil enters in advance when fishing salvages cavity；By setting drilling rod cavity and supporting plate, pass through after fishing socket is in orientation bottom
Drilling rod persistently presses to supporting plate, thinks that supporting plate moved down to drive strut to move down and by the work of fishing socket lower part two sides
Movable plate opens carry out fishing；By the way that strong magnet is arranged, absorption salvaging can be carried out to the metal pieces of orientation bottom；Pass through
Through-hole is set, the liquid mixture in salvage objects can be filtered；Operation of the present invention is simple, easy to use, not only may make
Effectively avoid in well soil sundries to enter in advance when being oriented well and protruding into fishing to salvage in tube inner chamber, and to
The metal pieces or other sundries salvaged in tube inner chamber are avoided to fall in Hui Jing when outer extraction fishing socket, effectively to be oriented well
Fishing provide great convenience, greatly reduce the salvaging difficulty of staff.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is schematic diagram of internal structure of the invention.
Fig. 3 is salvaging status diagram of the invention.
In figure: 1. clamping rings, 2. elastic openings, 3. limit plates, 4. nuts, 5. bolts, 6. screw holes, 7. reset springs, 8.
Drilling rod insert port, 9. fishing sockets, 10. hinges, 11. right movable plates, 12. through-holes, 13. left movable plates, 14. drilling rods, 15. struts,
16. perforation, 17. drilling rod cavities, 18. supporting plates, 19. strong magnets, 20. salvage cavity.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
The oil field Special fishing tool in conjunction with given by attached drawing 1~3 is equipped with drilling rod on the inner cavity top of the fishing socket 9
Cavity 17 is equipped with drilling rod insert port 8 corresponding with the drilling rod cavity 18 in 9 upper surface middle part of fishing socket, described
It is respectively equipped with perforation 17 on 18 two sidewalls of drilling rod cavity on 9 inner cavity top of fishing socket, is held in the 9 inner cavity top rod of fishing socket
The strut 16 with 17 clearance fits of the perforation, 18 two sides of drilling rod cavity are respectively equipped in perforation 17 on 18 two sidewalls of chamber
16 upper end of strut on wall is pierced by via perforation 17 to 9 top of fishing socket, under the strut 16 on 18 two sidewalls of drilling rod cavity
End is pierced by via perforation 17 to 9 inner cavity lower part of fishing socket, and supporting plate 19, the supporting plate 19 are equipped between two struts, 16 lower part
9 inner cavity lower part of fishing socket is divided into and salvages cavity 21, strong magnet 20 is equipped on 19 lower surface of supporting plate, in the salvaging
9 tops of cylinder are equipped with clamping ring 1, the clamping ring 1 by it is described be pierced by two struts 15 on 9 top of fishing socket and fishing socket 9 into
Row is fixedly connected, and is pierced by 9 upper part of fishing socket in two strut 15 and is respectively sleeved on reset spring 7, in the clamping
Ring 1 is equipped with elastic opening 2, and 2 two sides of elastic opening on the clamping ring 1 are respectively equipped with limit plate 3, elastic opens described
It is respectively equipped with corresponding screw hole 6 on the limit plate 3 of 2 two sides of mouth, is equipped with and wears on the limit plate 3 of 2 two sides of the elastic opening
The bolt 5 for crossing screw hole 6 on two limit plates 3 is equipped with nut 4 in one end of the bolt 5, in the 9 lower part two sides of fishing socket point
Not She You right movable plate 11 and left movable plate 13, the right movable plate 11 and left movable plate 13 are V-shaped structure, the right work
The corner 14 of 13 lower end of movable plate 11 and left movable plate is arc-shaped structure, in 13 side of the right movable plate 11 and left movable plate
It is respectively equipped with several through-holes 12, the right movable plate 11 and left movable plate 13 on wall and passes through hinge 10 and 9 lower part two sides of fishing socket
Articulated connection, the inner wall of the right movable plate 11 and left movable plate 13 and is pierced by the strut 16 of 18 two sidewalls lower part of drilling rod cavity
Lower end is fixedly connected.
Implement oil field Special fishing tool of the present invention, before being oriented well fishing, first passes through drilling rod 15
It is inserted into the drilling rod cavity 18 in fishing socket 9 by the drilling rod insert port 8 on 9 top of clamping ring 1 and fishing socket, so that 15 front end of drilling rod
Just at 19 top of supporting plate in fishing socket 9；After drilling rod insertion, pass through elastic opening on bolt 5 and 4 pairs of nut clamping rings 1
Mouth 2 is locked, so that clamping 1 firm stable of ring is connected on drilling rod 15；When being oriented well fishing, due to fixed
To well have certain hoistway, with drilling rod 15 protrude into drive fishing socket 9 persistently protrude into, during fishing socket 9 protrudes by
In the elastic spacing operation of reset spring 7, so that strut 16 can not press downwards, so that the right side of 9 lower part two sides of fishing socket
Movable plate 11 and left movable plate 13 are constantly in closed state, and the soil that not only can effectively avoid in directional well is salvaged in advance
Inside cavity 21, and since front is that sharp cone distal structure makes protruding into for fishing socket 9 more convenient；When fishing socket 9 stretches to
Orientation bottom can not continue after protruding into, and since drilling rod 15 continues to press downwards, drilling rod 15 can then be pushed down on supporting plate 19, from
And push down on strut 16, after strut 16 pushes down on, right movable plate 11 and left movable plate 13 are fixedly connected with strut 16 then
It can be opened by strut 16, the metal pieces for orienting bottom can then be salvaged the kicker magnet 20 of 21 inside supporting plate of cavity, 19 lower surface
Carry out absorption salvaging；After salvaging, it is drawn upwardly out drilling rod 15, drilling rod 15 can not press to supporting plate 19 after moving up, branch
Plate 19 and the strut of two sides 16 are lifted up by the automatic elasticity of reset spring 7, so that with the fixed company of two sides strut 16
The right movable plate 11 and left movable plate 13 connect withdraws closure, with the closure of right movable plate 11 and left movable plate 13, can will orient
The metal pieces and sundries of bottom are salvaged into salvaging inside cavity 21, with the lasting rising of drilling rod 15, are salvaged in cavity 21
Liquid mixture via on 13 side wall of right movable plate 11 and left movable plate through-hole 12 flow out；Drilling rod 15 and fishing socket 9 are complete
After extracting directional well out, it can be salvaged again after fishing socket 9 is salvaged metal pieces and sundries taking-up in cavity 21；This hair
It is bright easy to operate, it is easy to use, it not only may make and effectively avoid soil sundries in well when being oriented well and protruding into fishing
In advance enter salvage tube inner chamber in, and outward extraction fishing socket when effectively avoid salvage tube inner chamber in metal pieces or
Other sundries are fallen in Hui Jing, are provided great convenience to be oriented the fishing of well, are greatly reduced staff's
Salvage difficulty.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, those skilled in the art are complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention'.This invention it is technical
Range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (4)
1. a kind of oil field Special fishing tool, including fishing socket (9), it is characterized in that: being set on the inner cavity top of the fishing socket (9)
There are drilling rod cavity (17), is inserted in the fishing socket (9) upper surface middle part equipped with drilling rod corresponding with drilling rod cavity (18)
Entrance (8) is respectively equipped with perforation (17) on drilling rod cavity (18) two sidewalls on the fishing socket (9) inner cavity top, described
It is respectively equipped in perforation (17) on fishing socket (9) inner cavity top rod cavity (18) two sidewalls and matches with described perforation (17) gap
The strut (16) of conjunction, strut (16) upper end on drilling rod cavity (18) two sidewalls are pierced by via perforation (17) to fishing socket
(9) top, strut (16) lower end on drilling rod cavity (18) two sidewalls are pierced by via perforation (17) to fishing socket (9) inner cavity
Lower part is equipped with supporting plate (19) between two strut (16) lower part, and the supporting plate (19) separates fishing socket (9) inner cavity lower part
To salvage cavity (21), strong magnet (20) are equipped on the supporting plate (19) lower surface, are equipped with card on the fishing socket (9) top
It connects ring (1), clamping ring (1) is consolidated by described be pierced by two struts (15) on fishing socket (9) top and fishing socket (9)
Fixed connection, is pierced by fishing socket (9) upper part in two strut (15) and is respectively sleeved on reset spring (7), in the card
Ring (1) is connect equipped with elastic opening (2), elastic opening (2) two sides on clamping ring (1) are respectively equipped with limit plate (3),
It is respectively equipped with corresponding screw hole (6) on the limit plate (3) of described elastic opening (2) two sides, in the elastic opening (2) two
The limit plate (3) of side is equipped with the bolt (5) of the screw hole (6) on two limit plates (3), is equipped in one end of the bolt (5)
Nut (4) is respectively equipped with right movable plate (11) and left movable plate (13), the right work in the fishing socket (9) lower part two sides
Movable plate (11) and left movable plate (13) are V-shaped structure, and the right movable plate (11) and left movable plate (13) pass through hinge (10)
Be articulated and connected with fishing socket (9) lower part two sides, the inner wall of the right movable plate (11) and left movable plate (13) be pierced by drilling rod
Strut (16) lower end of cavity (18) two sidewalls lower part is fixedly connected.
2. oil field Special fishing tool according to claim 1, it is characterized in that: the right movable plate (11) and left movable plate
(13) corner (14) of lower end is arc-shaped structure.
3. oil field Special fishing tool according to claim 2, it is characterized in that: in the right movable plate (11) and left activity
Several through-holes (12) are respectively equipped on plate (13) side wall.
4. the application method of oil field Special fishing tool according to claim 1-3, it is characterized in that: being determined
To before well fishing, first drilling rod (15) is beaten via drilling rod insert port (8) insertion on clamping ring (1) and fishing socket (9) top
In drilling rod cavity (18) in dipper (9), so that drilling rod (15) front end is just at supporting plate (19) top in fishing socket (9)；
After drilling rod insertion, the elastic opening (2) in clamping ring (1) is locked by bolt (5) and nut (4), so that clamping ring
(1) firm stable is connected on drilling rod (15)；When being oriented well fishing, since directional well has certain well
Road, as protruding into for drilling rod (15) drives fishing socket (9) persistently to protrude into, due to reset spring during fishing socket (9) protrudes into
(7) elastic spacing operation, so that strut (16) can not press downwards, so that the right activity of fishing socket (9) lower part two sides
Plate (11) and left movable plate (13) are constantly in closed state, and the soil that can avoid in directional well carries out salvaging cavity (21) in advance
Inside, the sharp cone distal structure of front make protruding into for fishing socket (9) more convenient；When fishing socket (9) stretches to orientation bottom
It can not continue after protruding into, since drilling rod (15) continues to press downwards, drilling rod (15) can then be pushed down on supporting plate (19), thus will
Strut (16) pushes down on, and after strut (16) pushes down on, is fixedly connected with right movable plate (11) and left movable plate with strut (16)
(13) it can then be opened by strut (16), the metal pieces for orienting bottom can then be salvaged internal supporting plate (19) following table of cavity (21)
The kicker magnet (20) in face carries out absorption salvaging；It after salvaging, is drawn upwardly out drilling rod (15), drilling rod (15) can not be right after moving up
Supporting plate (19) presses, and by reset spring (7), automatically elasticity is lifted up the strut (16) of supporting plate (19) and two sides, from
And the right movable plate (11) being fixedly connected with two sides strut (16) and left movable plate (13) is made to withdraw closure, with right movable plate
(11) and the closure of left movable plate (13), the metal pieces for orienting bottom and sundries can be salvaged into salvaging in cavity (21)
The liquid mixture in cavity (21) is salvaged via right movable plate (11) and left activity with the lasting rising of drilling rod (15) in portion
Through-hole (12) outflow on plate (13) side wall；After drilling rod (15) and fishing socket (9) are fully drawn out directional well, fishing socket (9) is beaten
Metal pieces and sundries in fishing cavity (21) can be salvaged again after taking out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711101317.4A CN109779558A (en) | 2017-11-10 | 2017-11-10 | A kind of oil field Special fishing tool and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711101317.4A CN109779558A (en) | 2017-11-10 | 2017-11-10 | A kind of oil field Special fishing tool and its application method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109779558A true CN109779558A (en) | 2019-05-21 |
Family
ID=66484474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711101317.4A Withdrawn CN109779558A (en) | 2017-11-10 | 2017-11-10 | A kind of oil field Special fishing tool and its application method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109779558A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116752923A (en) * | 2023-08-16 | 2023-09-15 | 牡丹江市林海石油打捞工具有限公司 | Screw pump hydraulic overshot |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060049111A1 (en) * | 2004-08-31 | 2006-03-09 | Rattler Tools, Inc. | Metal debris cleanout system and method |
| CN202611639U (en) * | 2012-04-11 | 2012-12-19 | 中国石油集团川庆钻探工程有限公司钻采工程技术研究院 | Tool for coring along with drilling well wall |
| CN204252905U (en) * | 2014-10-17 | 2015-04-08 | 中国石油天然气股份有限公司 | Fishing device |
| CN205036333U (en) * | 2015-08-31 | 2016-02-17 | 陈志伟 | Multi -purpose test instrument fishing device in pit |
| CN105386738A (en) * | 2015-11-25 | 2016-03-09 | 中国石油天然气股份有限公司 | Salvaging tool and salvaging method |
| CN105569599A (en) * | 2016-03-22 | 2016-05-11 | 廖雄 | Fisher |
| CN105822246A (en) * | 2016-05-10 | 2016-08-03 | 惠州市公路管理局 | Opening-closing type salvaging device for drilled pile drill bits |
| CN207920570U (en) * | 2017-11-10 | 2018-09-28 | 杨田田 | A kind of directional well fishing device |
-
2017
- 2017-11-10 CN CN201711101317.4A patent/CN109779558A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060049111A1 (en) * | 2004-08-31 | 2006-03-09 | Rattler Tools, Inc. | Metal debris cleanout system and method |
| CN202611639U (en) * | 2012-04-11 | 2012-12-19 | 中国石油集团川庆钻探工程有限公司钻采工程技术研究院 | Tool for coring along with drilling well wall |
| CN204252905U (en) * | 2014-10-17 | 2015-04-08 | 中国石油天然气股份有限公司 | Fishing device |
| CN205036333U (en) * | 2015-08-31 | 2016-02-17 | 陈志伟 | Multi -purpose test instrument fishing device in pit |
| CN105386738A (en) * | 2015-11-25 | 2016-03-09 | 中国石油天然气股份有限公司 | Salvaging tool and salvaging method |
| CN105569599A (en) * | 2016-03-22 | 2016-05-11 | 廖雄 | Fisher |
| CN105822246A (en) * | 2016-05-10 | 2016-08-03 | 惠州市公路管理局 | Opening-closing type salvaging device for drilled pile drill bits |
| CN207920570U (en) * | 2017-11-10 | 2018-09-28 | 杨田田 | A kind of directional well fishing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116752923A (en) * | 2023-08-16 | 2023-09-15 | 牡丹江市林海石油打捞工具有限公司 | Screw pump hydraulic overshot |
| CN116752923B (en) * | 2023-08-16 | 2023-11-07 | 牡丹江市林海石油打捞工具有限公司 | Screw pump hydraulic overshot |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190521 |